JP2004072589A - Ultra wide band (UWB) transmitter and ultra wide band (UWB) receiver - Google Patents

Abstract

In a UWB-IR (Ultra Wide Bandwidth-Impulse Radio) transmitting / receiving apparatus, which is one of spread spectrum systems, it is difficult to realize an inexpensive and compact receiving apparatus with high timing synchronization accuracy required for the receiving apparatus. It is.
A difference between an offset from a timing determined by a time hopping sequence when the information signal is "1" and an offset when the information signal is "0" is equal to or longer than the impulse signal output time (Ti). Send. In response to the widening of the offset time difference, by setting the waveform of the impulse signal for detection on the receiving device side to a waveform whose signal output time is equal to or longer than Ti, the timing synchronization accuracy is relaxed and demodulation can be performed with an inexpensive and small-scale circuit.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
An apparatus for communicating using an impulse-like ultra-wide band signal, the present invention relates to an ultra-wide band (UWB) transmitting apparatus and an ultra-wide band (UWB) area receiving apparatus for enhancing resistance to multipath interference and timing jitter of a receiving apparatus. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a device for performing communication using an impulse-shaped ultra-wide band signal, a configuration described as a principle of UWB-IR in IEICE technical report SST 2001-63 (2002) is known. there were. UWB is a technique for transmitting data by transmitting a pulse of about nanosecond time without using a carrier, unlike an existing wireless technique. It is characterized by transmitting a signal with low transmission output below noise over a very wide band (for example, 1.5 GHz or more, or 25% or more from the center frequency). Because it can determine the position of objects and people with extremely high accuracy, it has been partially used in military radars and searching for human lives during disasters. Utilization in these applications was limited to the use of licenses by U.S. authorities, but on February 14, 2002, the Federal Communications Commission (FCC) began commercial use of the technology. Acknowledged. As a method of using UWB for information transmission, pulse position modulation, Bi-Phase modulation, and the like have been proposed.
[0003]
As shown in FIG. 27, a conventional ultra wideband (UWB) transmission / reception apparatus using a pulse position modulation method includes a time hopping sequence generating means 1 for outputting a time hopping sequence, and a time hopping sequence generating means 1 for outputting a time hopping sequence. Delay selecting means 34 for delaying the hopping sequence signal, impulse generating means 2 for generating an impulse signal at the timing of the output signal from the delay selecting means, amplifying means 3 for amplifying the impulse signal, and A transmitting apparatus 100 including an antenna means 4 for radiating a signal into the air, an antenna means 5 for feeding a UWB signal radiated into the air, and a low-noise amplifier for amplifying an output signal from the antenna means 5 with low noise. (LNA) means 6, multiplying means 7 for multiplying the signal from the low-noise amplifying means 6 and the detection impulse signal, A detection impulse signal generating means 10 for generating the detection impulse signal at a timing determined by a hopping sequence, a time hopping sequence generating means 9 for generating the time hopping sequence, a transmission-side time hopping sequence and the time hopping sequence. Synchronizing means 10 for establishing the synchronization of the above, integrating discharging means 11 for integrating and discharging the output of the multiplying means 7 in synchronism with the time hopping cycle, and judgment on receiving a signal from the integrating discharging means 11 based on a threshold 0 An ultra-wideband (UWB) transmission / reception device including a reception device 110 including the means 12.
[0004]
[Problems to be solved by the invention]
That is, in the ultra wideband (UWB) transmitting / receiving apparatus configured as shown in FIG. 27, the offset time from the time hopping signal is set to 0 when the information signal is “1”, and is set to 0 when the information signal is “0”. Are shifted by the impulse signal output time. Here, the impulse signal output time is Ti in FIG. This is because, as shown in FIG. 3, the detection impulse signal (correlation waveform) on the receiving device side is basically designed on the assumption that a correlation operation is performed in a time twice as long as Ti. As described above, if the offset time difference between the case where the information signal is “1” and the case where the information signal is “0” is only the impulse signal output time (Ti), if timing jitter occurs in the receiving apparatus, if the offset time difference is small, the correlation waveform becomes small. When the correlation calculation timing between the received signal and the received signal is shifted, the effect is large, and the probability of a determination error increases. If an attempt is made to realize a UWB transmitting / receiving apparatus with small timing jitter in order to eliminate this effect, there is a problem that the apparatus becomes expensive and large.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to realize a high-performance ultra-wide band (UWB) transmitting / receiving apparatus by reducing the influence of multipath interference and timing jitter.
[0006]
[Means for Solving the Problems]
To solve this problem, the present invention sets the offset time difference between the case where the information signal is "1" and the case where the information signal is "0" as shown in FIG. And reduce the effect of timing jitter. In response to the widening of the offset time difference, the detection impulse signal (correlation waveform) on the receiving device side has a waveform whose signal output time is equal to or longer than Ti as shown in FIG.
[0007]
Furthermore, simply increasing the signal output time in this manner is likely to be affected by thermal noise and the like because the correlation operation is performed even in a section in which no received signal is assumed to exist, and the probability of a determination error increases. Therefore, as shown in FIG. 14, the output from the low-noise amplifying device is branched, only one output is provided with delay means, the respective outputs are added, and a correlation operation with the addition result is performed. With such a configuration, the received signal always exists in the correlation calculation section, and it is possible to reduce the influence of thermal noise or the like.
[0008]
In addition, when a multipath wave exists, the signal power of the multipath wave can also be added, and performance degradation can be suppressed.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 of the present invention provides a time hopping sequence generating means for outputting a time hopping sequence, and a binary information signal for outputting the time hopping sequence signal as it is and for outputting the time hopping sequence signal with delay. Delay selection means for selectively switching according to 0 or 1), shift time setting means for setting the delay time of the delay selection means to be equal to or longer than one impulse signal output time, and output from the delay selection means. An impulse generating means for generating an impulse signal at a signal timing, an amplifying means for amplifying the impulse signal, and an antenna means for radiating a signal from the amplifying means into the air, and an offset determined by the information signal. The time interval can be set arbitrarily so as to be longer than one impulse signal output time, Effect of Imingujitta can relatively be reduced that the has the effect that small and can realize an inexpensive UWB transmitting device.
[0010]
According to a second aspect of the present invention, a time hopping sequence generating means for outputting a time hopping sequence, and a case where the time hopping sequence signal is output as it is or a case where the time hopping sequence signal is output after being delayed are selected according to an M-value information signal. Delay selecting means, shift time setting means for setting the delay time of the delay selecting means to be equal to or longer than one impulse signal output time, and generating an impulse signal at a signal timing outputted from the delay selecting means. And an amplifying means for amplifying the impulse signal, and an antenna means for radiating a signal from the amplifying means into the air. The offset time interval determined by the M-value information signal is set to one. The timing jitter can be set arbitrarily so as to be longer than the impulse signal output time. Effect when transmitting multi-valued information signal is increased, it is possible to mitigate this effect, an effect that can realize a high-performance UWB transmitting device.
[0011]
According to a third aspect of the present invention, in the ultra-wideband transmitting apparatus according to the first or second aspect, the shift time setting means sets the offset time difference of the generated impulse signal to N times (N: N) of one impulse signal output time. (An integer of 2 or more), and the offset time interval determined by the information signal is an integral multiple of one impulse signal output time. It has the effect of reducing power consumption.
[0012]
According to a fourth aspect of the present invention, in the ultra-wide band transmitting apparatus according to any one of the first to third aspects, the shift time setting means adaptively changes the offset time difference. Since the interval is adaptively controlled, it is possible to reduce the deterioration of the reception quality due to the multipath wave or the like on the receiving side, which has the effect of enabling high quality UWB transmission.
[0013]
An antenna for feeding a UWB signal radiated in the air, a low-noise amplifier for amplifying an output signal from the antenna with low noise, and a time-hopping sequence for generating a time-hopping sequence Generating means, a synchronizing means for establishing synchronization between the transmission-side time hopping sequence and the receiving-side time hopping sequence generation means from the signal from the low-noise amplification means, and a time hopping sequence synchronously established by the synchronization means. Detection impulse signal generation means for generating a detection impulse signal having an output time longer than one impulse signal output time on the transmission side at a determined timing, a signal from the low noise amplifying means, and the detection impulse signal. Multiplying means and the output of the multiplying means by the period of the time hopping sequence. The transmitting side and the receiving side are composed of integrating discharging means for performing integrated discharging in synchronism, and determining means for receiving a signal from the integrating discharging means and making a determination around a threshold 0 and outputting a binary information signal. In this case, the effect of the timing jitter of each clock can be reduced, and an UWB receiver using an inexpensive clock can be realized.
[0014]
According to a sixth aspect of the present invention, there is provided an antenna unit for feeding a UWB signal radiated into the air, a low noise amplifying unit for amplifying an output signal from the antenna unit with low noise, and a time hopping sequence for generating a time hopping sequence. Generating means, synchronizing means for establishing a synchronization between a time hopping sequence on the transmitting side and a time hopping sequence on the receiving side from a signal from the low noise amplifying means, and a time hopping sequence synchronously established by the synchronizing means. A detection impulse signal generation means for generating a detection impulse signal having an output time longer than one impulse signal output time on the transmission side at the timing; and a signal from the low noise amplification means and the detection impulse signal. Multiplying means and the output of the multiplying means are the same as the period of the time hopping sequence. Integral discharge means for performing integral discharge, and determining means for receiving a signal from the integral discharge means, determining with reference to M-1 thresholds, and outputting an information signal of M value (M: an integer of 2 or more). When receiving a multi-valued information signal in which the influence of timing jitter is large, the influence can be mitigated, and a high-quality UWB receiver can be realized even if an inexpensive clock is adopted. It has the effect that it becomes possible.
[0015]
The invention according to claim 7, wherein antenna means for feeding a UWB signal radiated into the air, low-noise amplifying means for amplifying an output signal from the antenna means with low noise, and a time-hopping sequence for generating a time-hopping sequence Generating means, synchronizing means for establishing synchronization between a time hopping sequence on the transmission side and the time hopping sequence from a signal from the low noise amplifying means, and N detection impulse signals different in timing determined by the time hopping sequence N detecting impulse signal generating means for generating the signal, N multiplying means for multiplying the signal from the low noise amplifying means and the detecting impulse signal, respectively, N integrated discharge means for performing integrated discharge in synchronization with the cycle of the series, and N integrated discharge means for the preceding period N sampling means for sampling the signal in synchronism with the cycle of the time hopping sequence, and absolute value maximum branch judging means for judging the branch having the largest absolute value among the output signals from the N sampling means. And a demapping means for receiving the output signals from the N previous sampling means and the output signal from the maximum absolute value branch judging means and demapping the judgment data as an M-value information signal and outputting the same. Therefore, when a multi-valued information signal is received, there is no need to set a threshold value that greatly affects the reception performance, so that the transmission of a UWB multi-valued signal can be realized with high performance. .
[0016]
According to an eighth aspect of the present invention, in the ultra-wide band (UWB) receiving device according to any one of the fifth to seventh aspects, the detection impulse generating means includes a signal output time of one impulse signal output time on the transmission side. (N: an integer of 2 or more), and the output time of the detection impulse signal is limited to an integer multiple, so that the design is facilitated and the design know-how of the conventional UWB receiver is known. Can be used, and an operation of realizing a high quality UWB receiving apparatus can be realized.
[0017]
According to a ninth aspect of the present invention, in the ultra wide band (UWB) receiving apparatus according to any one of the fifth to eighth aspects, the signal from the low noise amplifying means is provided with a delay of an offset time difference between binary information signals. And an adding means for adding an output signal from the delay means and a signal from the low-noise amplifying means, and eliminating a signal-free section in the integration section to reduce thermal noise in the correlation operation. And the like, and has the effect of realizing a higher performance UWB receiver.
[0018]
According to a tenth aspect of the present invention, in the ultra wide band (UWB) receiving apparatus according to any one of the fifth to eighth aspects, a signal from the low noise amplifying unit is delayed by a delay time corresponding to an offset time difference between information signals. N-1 delay means, and an addition means for adding the output of the N-1 delay means and the signal from the low noise amplifying means, which has higher performance than the binary case. Even in the case of multilevel transmission requiring reception, there is an effect that a section in which no signal exists in the integration section can be eliminated, the influence of thermal noise can be reduced, and good communication with high performance can be achieved.
[0019]
According to an eleventh aspect of the present invention, in the ultra-wide band (UWB) receiving device according to any one of the fifth to tenth aspects, the detection impulse generation means adaptively changes an output time of an impulse signal to be generated. In the case where the offset time interval is adaptively controlled on the transmission side for the purpose of reducing the deterioration of reception quality due to multipath waves and the like on the reception side, detection on the reception side is This makes it possible to match the impulse signal for use with the transmitting side, and has the effect of enabling high quality UWB transmission even in a poor radio wave propagation environment.
[0020]
An antenna for feeding a UWB signal radiated in the air, a low-noise amplifier for amplifying an output signal from the antenna with low noise, and a time-hopping sequence for generating a time-hopping sequence Generating means, synchronizing means for establishing synchronization between a time hopping sequence on the transmitting side from the signal from the low noise amplifying means and the time hopping sequence, and transmitting at a timing determined by the time hopping sequence synchronously established by the synchronizing means. A detection impulse signal generating means for generating a detection impulse signal having an output time longer than one impulse signal output time on the side, and a delay time corresponding to an offset time difference between information signals from a signal from the low noise amplifier means. N-1 delay means, and outputs of the N-1 delay means. And a branch selecting means for selecting the number of outputs of the N-1 delay means to be added in response to the adaptively changing the offset time difference, and the N-1 selected by the branch selecting means. Adding means for adding the outputs of the delay means and the signal from the low-noise amplifying means; multiplying means for multiplying the signal from the adding means by the detection impulse signal; and It is composed of an integrating discharge means for integrating and discharging in synchronism, and a determining means for receiving a signal from the integrating discharge means and making a determination around a threshold 0 and outputting a binary information signal. In addition to being able to increase the tolerance of accuracy deterioration, it can be realized with a simple configuration, and an inexpensive and compact UWB receiver can be realized. A.
[0021]
According to a thirteenth aspect of the present invention, in the ultra wideband (UWB) receiving device according to the eleventh or twelfth aspect, the multi-path estimating means for estimating a multipath wave generated in a propagation path is further provided. The offset time difference is adaptively changed according to the output from the estimating means.In order to minimize the deterioration of the reception quality due to the multipath wave or the like on the receiving side, the offset time interval is set to a time when no multipath wave exists. Since the setting is controlled, the tolerance of the synchronization accuracy deterioration due to the timing jitter or the like can be adaptively reduced even in a multipath environment, and an effect that high-quality UWB transmission becomes possible.
[0022]
The invention according to claim 14 is the ultra wide band (UWB) receiving device according to claim 12, further comprising multipath estimating means for estimating a multipath wave generated in a propagation path, wherein the branch selecting means is a multipath estimator. The number of outputs of the delay unit is selected according to the output from the path estimation unit.Correlation calculation is performed in accordance with the offset time interval adaptively controlled to reduce the influence of multipath waves and the like. The configuration is such that it is easy to minimize the effect of thermal noise in the integration interval to be performed, and has an effect that a small, high-performance UWB receiver can be realized.
[0023]
An invention according to claim 15, wherein antenna means for feeding a UWB signal radiated into the air, low-noise amplifying means for amplifying an output signal from the antenna means with low noise, and a time-hopping sequence for generating a time-hopping sequence Generating means, synchronizing means for establishing synchronization between a time hopping sequence on the transmitting side from the signal from the low noise amplifying means and the time hopping sequence, and transmitting at a timing determined by the time hopping sequence synchronously established by the synchronizing means. Detecting impulse signal generating means for generating a detecting impulse signal having an output time longer than one impulse signal output time on the side, multipath estimating means for estimating a multipath wave generated in a propagation path, and low noise The time position of the multipath wave in which the signal from the amplifying means is estimated is an information signal. N-1 delay means for setting a delay time so as not to be delayed, and branch selecting means for selecting an output of the N-1 delay means from a temporal position of the multipath wave estimated by the multipath estimating means. Adding means for adding the output of the N-1 delay means selected from the branch selecting means and the signal from the low-noise amplifying means; and outputting the signal from the adding means and the detection impulse signal. A multiplying means for multiplying, an integrating discharge means for integrating and discharging the output of the multiplying means in synchronization with the time hopping cycle, and a determining means for receiving a signal from the integrating discharging means, making a determination around a threshold 0, and outputting an information signal. It corresponds to an offset time interval that is adaptively controlled to reduce the effect of the multipath wave, and at the same time, Since Shin signal are configured so as not used for correlation calculation, degradation due to multipath waves also becomes possible to reduce an effect that high-quality transmission becomes possible.
[0024]
According to a sixteenth aspect of the present invention, there is provided an ultra-wide band (UWB) transmitting apparatus according to any one of the first to fourth aspects, and an ultra-wide band (UWB) receiving apparatus according to any one of the fifth to fifteenth aspects. Therefore, the effects of timing jitter and the like can be reduced, a UWB transmitting / receiving apparatus using an inexpensive device can be realized, and the cost per bit required for transmission can be reduced.
[0025]
According to a seventeenth aspect of the present invention, in the ultra wideband (UWB) receiving device according to any one of the thirteenth to fifteenth aspects, a multipath wave estimation result output of a multipath estimating unit is notified to a transmitting device. It is possible to realize a UWB transceiver that can reduce the effects of timing jitter and also reduce the effects of multipath waves, enabling high-speed transmission even in poor radio propagation environments where the effects of multipath waves cannot be ignored. It has the effect of becoming
[0026]
According to an eighteenth aspect of the present invention, in the ultra-wide band (UWB) transmitting apparatus according to any one of the first to fourth aspects, an offset time from a timing determined by a time hopping sequence is obtained by using a signal obtained by performing error correction coding on an information signal. Although the frequency use efficiency is reduced by error correction coding, the throughput of the entire system including retransmission due to errors is improved, and the finite frequency resources can be used effectively. Having.
[0027]
According to a nineteenth aspect of the present invention, in the ultra-wide band (UWB) transmitting apparatus according to the eighteenth aspect, the error correction coding uses convolutional coding, and the error rate coding is performed by using convolutional coding. Has a function of enabling high-performance communication.
[0028]
According to a twentieth aspect of the present invention, in the ultra wideband (UWB) receiving device according to any one of the fifth to fifteenth aspects, a convolutionally encoded signal transmitted from the ultra wideband (UWB) transmitting device according to the nineteenth aspect is provided. Is provided with soft-decision Viterbi decoding means for soft-decision Viterbi decoding of the integrated discharge output from the integrating means. Viterbi decoding enables decoding with a small error rate and enables high-performance communication. Has an action.
[0029]
According to a twenty-first aspect of the present invention, in the ultra wideband (UWB) transmitting apparatus according to the eighteenth aspect, the error correction coding uses turbo coding, and the error rate is small by transmitting using turbo coding. Decoding is enabled, and high-performance communication is enabled.
[0030]
According to a twenty-second aspect of the present invention, there is provided an ultra-wideband (UWB) receiving apparatus according to any one of the fifth to fifteenth aspects, wherein a turbo-coded signal transmitted from the ultra-wideband (UWB) transmitting apparatus according to the twenty-first aspect is provided. Is provided with turbo decoding means for turbo-decoding the integrated discharge output from the integrating means. Although the circuit scale is increased and the delay time before decoding is increased, the error rate is smaller than that of soft decision Viterbi decoding. Decoding is enabled, and high-performance communication is enabled.
[0031]
According to a twenty-third aspect of the present invention, in the ultra-wide band (UWB) transmitting apparatus according to any one of the first to fourth aspects, the repetition period of the information signal is adaptively shorter than the period of the time hopping sequence. When the propagation path condition is good, shortening the repetition period of the information signal reduces the orthogonality due to spreading and reduces resistance to interference signals and thermal noise, while enabling communication at high transmission rates. Having.
[0032]
According to a twenty-fourth aspect of the present invention, in the ultra-wide band (UWB) receiving apparatus according to any one of the fifth to fifteenth aspects, a repetition period of an information signal transmitted from the ultra-wide band (UWB) transmitting apparatus according to the twenty-third aspect. In the case where the propagation path condition is good, the repetition period of the information signal is shortened to reduce the orthogonality due to diffusion, and the resistance to interference signals and thermal noise decreases. On the other hand, it has the effect of enabling communication at a high transmission rate.
[0033]
According to a twenty-fifth aspect of the present invention, in the ultra wideband (UWB) receiving apparatus according to any one of the twentieth, twenty-second, and twenty-fourth aspects, a signal obtained by A / D converting an integrated discharge output is decoded. Digital signal processing can be applied to signal processing in the case of decoding, which has an effect that a small and high-performance communication device can be realized.
[0034]
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0035]
(Embodiment 1)
FIG. 1 shows a block diagram of an ultra-wide band (UWB) transmitting / receiving apparatus according to Embodiment 1 of the present invention.
[0036]
The apparatus includes a modulator for modulating a binary information signal to be transmitted, a transmitting antenna for transmitting the modulated signal, a receiving antenna for receiving a signal radiated in the air, and a demodulator for demodulating a receiving antenna output signal. Consists of
[0037]
In FIG. 1, an ultra-wide band (UWB) transmitting / receiving apparatus according to the present invention includes a time hopping sequence generating means 1 for outputting a time hopping sequence, and a binary output for outputting the time hopping sequence signal as it is and for outputting it with a delay. Delay selecting means 34 for selectively switching according to the information signal (0 or 1), shift time setting means 33 for setting the delay time of the delay selecting means 34 to be longer than one impulse signal output time, and delay selecting means A transmitting device including an impulse generating means 2 for generating an impulse signal at a signal timing outputted from 34, a power amplifying means 3 for amplifying the impulse signal, a transmitting antenna 4 for radiating the amplified signal to the air, Receiving antenna 5 for feeding the radiated UWB signal, low-noise amplification of the output signal from receiving antenna 5 A low-noise amplifying means 6, a multiplying means 7 for multiplying the signal from the low-noise amplifying means 6 and the detection impulse signal, and one impulse signal on the transmitting side at a timing determined by a time-hopping sequence synchronized by the synchronizing means 10. Impulse generation means 8 for generating a detection impulse signal having an output time longer than the output time, time hopping sequence generation means 9 for generating a time hopping sequence, synchronization means 10 for establishing synchronization with the transmitting side, and multiplication means 7 Integral discharging means 11 for integrating and discharging the output in synchronization with the cycle of the time hopping sequence, determining means 12 for receiving a signal from integrating discharging means 11 to determine the signal based on threshold 0, and outputting a binary information signal, etc. Receiving device.
[0038]
The UWB transmitting and receiving apparatus offsets the output timing determined by the time hopping sequence in accordance with the information signal, generates an impulse signal at that timing, radiates it into the air by the transmitting antenna, and amplifies the impulse signal received by the receiving antenna. The reception signal is determined by detecting the correlation.
[0039]
The operation of the ultra-wide band (UWB) transmitting / receiving apparatus configured as described above will be described.
[0040]
The operation of the transmitting device 100 will be described.
[0041]
The time hopping sequence generating means 1 generates and outputs a time hopping sequence signal. The delay selecting unit 34 selectively switches between a case where the time hopping sequence signal from the time hopping sequence generating unit 1 is output as it is and a case where the time hopping sequence signal is output with a delay according to the binary information signal (0 or 1). Output. The shift time setting means 33 sets the delay time of the delay selecting means 34 to be equal to or longer than one impulse signal output time. The impulse generating means 2 generates an impulse signal at the signal timing output from the delay selecting means 34. The amplifying means 3 amplifies the impulse signal generated by the impulse generating means 2 and radiates it into the air by the antenna means 4.
[0042]
Next, the operation of the receiving device 110 will be described. The UWB signal radiated into the air by the antenna means 5 is fed. The low noise amplification (LNA) means 6 amplifies the output signal from the antenna means 5 with low noise.
[0043]
The time hopping sequence generating means 9 generates and outputs a time hopping sequence signal. The synchronization unit 10 establishes synchronization between the transmission-side time hopping sequence and the reception-side time hopping sequence generation unit 9 from the signal from the low noise amplification unit 6. The detection impulse signal generation means 8 generates a detection impulse signal having an output time longer than one impulse signal output time on the transmission side at a timing determined by the time hopping sequence synchronized by the synchronization means 10.
[0044]
The multiplication means 7 multiplies the signal from the low noise amplification means 6 by the detection impulse signal from the detection impulse signal generation means 8. The integrating and discharging means 11 integrates and discharges the output from the multiplying means 7 in synchronization with the time hopping cycle. The determining means 12 receives the signal from the integrating and discharging means 11 and makes a determination around the threshold 0, and outputs a binary information signal.
[0045]
Next, the offset time of the impulse signal in impulse generating means 2 of transmitting apparatus 100 according to the first embodiment will be described in detail.
[0046]
An impulse signal 501 is generated at a timing based on a signal from the time hopping sequence generating means 1 for generating a time hopping sequence such as a PN sequence, which is a random sequence. Here, in the delay selecting means 34, the generation timing of the impulse signal is shifted by the information signal of "0" or "1". For example, when the information signal is "1", the impulse signal 502 is generated at a timing determined by the time hopping sequence (without offsetting), and when the information signal is "0", the impulse signal 502 is offset from the timing determined by the time hopping sequence. The impulse signal 503 is generated at the timing 504 (delayed) (see FIG. 5).
[0047]
As described above, when the offset time difference shown in FIG. 5 is the same as Ti, which is the impulse generation time, as described above in the related art, only the same effect as in the related art can be obtained. If the offset time difference is made equal to or more than Ti by the shift time setting means 33, the tolerance against timing jitter in the synchronization means 10 in the receiving device 110 is preferably increased. For example, when the offset time difference is (Ti + Tδ) 604 (see FIG. 6), if the waveform of the impulse signal in the impulse generating means 8 of the receiving device 110 is expanded in the time direction as shown in FIG. The relationship among the received signal 701, the impulse signals 702 and 703, and Tδ704 in the means 7 is as shown in FIG. 7, and the tolerance to timing jitter is increased. This is because the correlation calculation (multiplication and integration discharge) results are the same even when the generation timing of the impulse signal on the receiving side is shifted by Tδ / 2 due to timing jitter. That is, even when the generation timing of the impulse signal on the receiving side is shifted, a timing shift of Tδ / 2 or less is allowed.
[0048]
The upper limit of Tδ of the offset time difference (Ti + Tδ) is (Tm−Ti) when the shortest hopping time of the time hopping sequence is Tm. If the upper limit is exceeded, it becomes impossible to distinguish between a time shift due to Tδ and a time shift due to time hopping. Therefore, the setting range of Tδ is 0 <Tδ <(Tm−Ti), and in consideration of the influence of thermal noise and the like, it is more appropriate to set the range to about 0 <Tδ <(Tm / 2). .
[0049]
In the above description, the offset time difference is described as (Ti + Tδ). However, by setting Tδ = NTi (N: an integer of 1 or more) of the offset time difference Ti + Tδ, the offset time difference becomes an integral multiple of the offset time difference Ti. The structure of the means is easy and easy to realize.
[0050]
In addition, when the performance is improved by providing a delay unit on the receiving device side as described later, it is simple and preferable because it is sufficient to realize a delay time that is an integral multiple of Ti.
[0051]
(Embodiment 2)
FIG. 8 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 2 of the present invention.
[0052]
The present apparatus is configured to enable multi-level transmission, and includes a modulator for modulating a multi-level information signal, a transmitting antenna for transmitting a modulated signal, a receiving antenna for receiving a signal radiated in the air, and a receiving antenna. It comprises a demodulator for demodulating the output signal in response to multi-level transmission.
[0053]
In FIG. 8, the UWB transmitting / receiving apparatus of the present invention includes a time hopping sequence generating means 1 for outputting a time hopping sequence, a serial / parallel (S / P) converting means 15 for serial / parallel converting an information signal inputted serially, Delay selection means 34 for selectively switching between the case where the time hopping sequence signal is output as it is and the case where the time hopping sequence signal is output with delay according to the M-value information signal, and the delay time of the delay selection means 34 is one impulse signal output time The shift time setting means 33 for setting as described above, the impulse generating means 2 for generating an impulse signal at the signal timing output from the delay selecting means 34, the power amplifying means 3 for amplifying the impulse signal, the aerial signal amplification A transmitting device 100 including a transmitting antenna 4 for radiating the air, A receiving antenna 5 for feeding a UWB signal, a low noise amplifying means 6 for amplifying an output signal from the receiving antenna 5 with low noise, a multiplying means 7 for multiplying a signal from the low noise amplifying means 6 by a detection impulse signal, a synchronizing means 10 At the timing determined by the time hopping sequence established synchronously, a detection impulse generating means 8 for generating a detection impulse signal having an output time longer than one impulse signal output time on the transmission side, and a time for generating a time hopping sequence Hopping sequence generating means 9, synchronizing means 10 for establishing synchronization with the transmitting side, integrating discharging means 11 for integrating and discharging the output of multiplying means 7 in synchronization with the cycle of the time hopping sequence, and controlling the threshold value according to the average received power Threshold value setting means 13 for performing the M-value signal based on the threshold value set by the threshold value setting means 13 Constant, and a receiving apparatus 110. comprised M value determining unit 14 or the like for outputting the information signal M values.
[0054]
The second embodiment shows an embodiment of a multi-level transmission UWB transmitting / receiving apparatus, which is different from the first embodiment in that multi-level transmission is performed and wireless transmission is more efficient than in the case of binary transmission. It is possible to do. The following description focuses on differences from the first embodiment.
[0055]
The operation will be described below.
[0056]
The information signal to be transmitted is converted in parallel by the S / P converter 15. The time hopping sequence generating means 1 generates and outputs a time hopping sequence signal. The delay selecting unit 34 selectively switches between a case where the time hopping sequence signal from the time hopping sequence generating unit 1 is output as it is and a case where the time hopping sequence signal is output after being delayed according to the M-value information signal. The shift time setting means 33 sets the delay time of the delay selecting means 34 to be equal to or longer than one impulse signal output time. The impulse generating means 2 generates an impulse signal at the signal timing output from the delay selecting means 34.
[0057]
For example, in the case of quaternary (2-bit) transmission, an information signal that is a serial signal is converted into a 2-bit parallel signal by the S / P converter 15 and the converted parallel signal is {00}, {01}, The offset time in the conventional example is 0 for {00}, Ti for {01}, 2Ti for {10}, and 3Ti for {11}. And had In the present invention, an impulse signal is generated by setting the above-mentioned offset time to 0 for {00}, Ti + Tδ for {01}, 2 (Ti + Tδ) for {10}, and 3 (Ti + Tδ) for {11}. Let it be sent.
[0058]
FIG. 9 shows an example of a corresponding waveform of the detection impulse signal in the detection impulse generating means 8 of the receiving apparatus 110. By adopting a waveform as shown in FIG. 9 and setting the amplitude to -B, + A, -A, and + B at each timing, the integrated discharge result of the signal multiplied by these different amplitudes is 4 if there is no thermal noise. One of the values. Accordingly, the threshold value setting means 13 sets an intermediate value between these four values as a threshold value, and the M value determination means 14 at the subsequent stage makes a determination based on the set threshold value. Any one of {00}, {01}, {10}, and {11} is output as the determination result.
[0059]
Here, since the received signal power is different due to a difference in the distance between the transmitting apparatus 100 and the receiving apparatus 110 or the like, it is necessary to appropriately control the threshold, and the threshold is set by the threshold setting means 13. Specifically, for example, a known pilot signal, a synchronization signal, and the like are transmitted, and a threshold is set based on the received signal power when these are received. It is preferable that the amplitude of the impulse signal waveform in the impulse generating means 8 be B = A / 2 so that the inter-signal distance becomes maximum.
[0060]
As described above, even in the case of multi-level transmission, the waveform of the detection impulse signal in detection impulse generating means 8 of receiving apparatus 110 is expanded in the time direction as shown in FIG. Then, the relationship between the received signals 1106 to 1109 and the impulse signals 1101 to 1104 in the multiplying means 7 of the receiving device 110 becomes as shown in FIG. 11, and the tolerance to timing jitter (Tδ) 1105 is increased.
[0061]
By limiting the offset time difference Ti + Tδ so that Tδ = NTi (N: an integer of 1 or more), the offset time difference becomes an integral multiple of the offset time difference Ti implemented in the prior art. The configuration is easy and easy to realize. In addition, when the performance is improved by providing a delay unit on the receiving device side as described later, it is simple and preferable because it is sufficient to realize a delay time that is an integral multiple of Ti. In multi-level transmission, high precision timing synchronization accuracy is required by the system. However, with this configuration, the required timing synchronization accuracy can be easily reduced, which is preferable.
[0062]
(Embodiment 3)
FIG. 12 shows a block diagram of a UWB receiver according to Embodiment 3 of the present invention.
[0063]
In FIG. 12, a receiving antenna 5 for feeding a UWB signal radiated into the air, a low-noise amplifying unit 6 for amplifying an output signal from the receiving antenna 5 with low noise, a signal from the low-noise amplifying unit 6 and an impulse signal for detection. Multiplying means 7 for generating a first impulse signal for detection at a timing determined by the time hopping sequence (# 1) 8a, and generating a second impulse signal for detection at a timing determined by the time hopping sequence Detection impulse generation means (# 2) 8b, a synchronization means 10 for establishing synchronization with the transmitting side, a time hopping sequence generation means 9 for generating a time hopping sequence, and an output of the multiplication means 7 synchronized with the time hopping cycle. Integral discharge means 11 for performing integral discharge, and the output of integral discharge means 11 is time-hopped. Sampling means 16 for sampling in synchronization with the sampling cycle; absolute value maximum branch determining means 17 for determining a branch having a maximum absolute value from a plurality of outputs from the sampling means 16; and a data for outputting a signal corresponding to the determined branch. The receiving device 110 includes the mapping unit 18 and the like.
[0064]
The configuration of the receiving apparatus 110 as shown in FIG. 12 is preferable because there is no need to set a threshold value that greatly affects the receiving performance. FIG. 12 shows the case of quaternary transmission. In the case of performing multi-value transmission, the number of detection impulse generating means 8 is increased to # 3, # 4,. Means 16 may be increased correspondingly.
[0065]
The third embodiment is different from the second embodiment in that the configuration corresponding to the multi-value conversion is not the amplitude direction but the time direction, and the following description focuses on the differences from the second embodiment.
[0066]
FIG. 13 shows a detection impulse signal in the detection impulse generation means # 1 (10a) and a detection impulse signal in the detection impulse generation means # 2 (10b).
[0067]
Such a detection impulse signal is multiplied separately by the respective multiplication means 7a and 7b, and integrated by the integration discharge means 11a and 11b at the subsequent stage, thereby obtaining the same result as in the case of binary transmission. Then, the sampling units 16a and 16b sample at every cycle of the time hopping sequence, and the demapping units 18a and 18b demap.
[0068]
The maximum value determining means 17 for determining the branch having the maximum absolute value is configured so as to perform demapping corresponding to the sampling result having the maximum absolute value of the sampling result.
[0069]
With this configuration, the maximum value of the correlation result of the signal received at the most probable timing is selected, and whether the correlation result is positive or negative and the output from which branch Demapping is performed according to the fact.
[0070]
For example, the offset time from the timing determined by the time hopping sequence in the transmitting device is 0 for {00}, Ti + Tδ for {01}, 2 (Ti + Tδ) for {10}, and 3 for {11}. In the case of (Ti + Tδ), the absolute value of the correlation result in the upper branch (impulse generation # 1 side) in FIG. 12 is larger, and when the correlation result is positive, {01} is demapped and the correlation result is Is negative, {10} is demapped. On the other hand, the absolute value of the correlation result of the branch on the lower side (impulse generation # 2 side) is larger, and {11} is deciphered when the correlation result is positive and {00} when the correlation result is negative. Is mapped.
[0071]
As described above, by configuring the correlation calculation means in parallel on the receiving side, it is not necessary to set a threshold value that greatly affects the reception performance, so that transmission of UWB multilevel signals can be realized with high performance. This has the effect of becoming
[0072]
By limiting the offset time difference Ti + Tδ so that Tδ = NTi (N: an integer of 1 or more), the offset time difference becomes an integral multiple of the offset time difference Ti implemented in the prior art. The configuration is easy and easy to realize. In addition, when the performance is improved by providing a delay unit on the receiving device side as described later, it is simple and preferable because it is sufficient to realize a delay time that is an integral multiple of Ti. In multi-level transmission, high precision timing synchronization accuracy is required by the system. However, with this configuration, the required timing synchronization accuracy can be easily reduced, which is preferable.
[0073]
(Embodiment 4)
FIG. 14 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 4 of the present invention.
[0074]
The fourth embodiment is different from the first embodiment in the configuration in which a delay unit 19 and an addition unit 20 are added to the receiving apparatus 110, and the following description focuses on the differences from the first embodiment.
[0075]
The operation of the UWB transmitting / receiving apparatus configured as described above will be described.
[0076]
Transmitting apparatus 100 is the same as in the first embodiment, and a description thereof will not be repeated.
[0077]
The impulse signal radiated into the air on the transmitting side is received by the receiving antenna 5 and amplified by the low noise amplifier 6. The signal amplified by the low-noise amplifying means 6 is configured to be branched and input to the adding means 20 at the subsequent stage as it is, or to be input to the adding means 20 via the delay means 19. It is also separately input to the synchronization means 10 and controls the time hopping sequence generation means 9 so as to synchronize with the transmission side. It should be noted that it is also preferable to configure a band-pass filter before or after the low-noise amplifier 6 in order to improve the signal-to-noise ratio.
[0078]
In the adding means 20, the signal delayed by the delay means 19 and the signal not delayed are added. When the offset time difference between the signals 0 and 1 on the transmitting side is 2Ti, the delay time of the delay unit 19 is preferably set to Ti.
[0079]
The multiplying means 7 is provided at the subsequent stage of the adding means 20, and multiplies the detection impulse signal generated by the detection impulse generating means 8 at a timing synchronized with the time hopping sequence on the transmission side. Here, a 2Ti impulse generation signal 1501 as shown in FIG. 15 is output as the detection impulse signal. By thus doubling the impulse generation time to 2Ti, even when the synchronization accuracy with the time hopping sequence on the transmission side is not sufficient, it is possible to reduce the deterioration of the correlation value that is the result of the multiplication.
[0080]
Similarly to the prior art, the integral discharge means 11 repeats the integral discharge at the time of the cycle of the time hopping sequence in the stage subsequent to the multiplication means 7 as in the conventional technique. Then, the determining means 12 determines whether the integrated value at the discharge timing is larger or smaller than the threshold and decodes the information signal.
[0081]
In the present embodiment, since a signal delayed on the receiving side and a signal not delayed are added, unlike FIG. 7 in the first embodiment, there is no section where no signal exists, and thermal noise and the like in the correlation operation are eliminated. The influence can be reduced, and a higher performance UWB transmitting / receiving apparatus can be realized.
[0082]
It is also preferable to adopt a configuration shown in FIG. 16 in which a plurality of delay means are provided, where the number of delay means is N (N: an integer of 2 or more), and the delay time of each delay means is ΔTi, 2Ti, 3Ti,..., (N−1) Ti}, in this case, the offset time difference between the information signals 0 and 1 on the transmitting side is NTi, and the generation time of the detection impulse signal generated by the detection impulse generation means 9 is With NTi, it is possible to further allow synchronization accuracy, and it is easy to realize a UWB transmitting / receiving apparatus using a wider frequency band.
[0083]
When the offset time difference is not set to an integral multiple of Ti, it is not necessary to limit the delay time of the delay means to an integral multiple of Ti, and it is preferable to set the delay time to the highest performance.
[0084]
(Embodiment 5)
FIG. 17 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 5 of the present invention.
[0085]
Embodiment 8 of the present invention provides an offset time difference control (Tδ control) unit 22 in front of a shift time setting unit in addition to the configuration of FIG. The offset time adjusted by the time setting means 33 is controlled. You.
[0086]
Next, the operation of the fifth embodiment of the present invention will be described focusing on the differences from the first embodiment.
[0087]
The offset time difference control means 22 controls the shift time setting means 33 so as to make the delay time Tδ from the timing of the time hopping sequence generated by the time hopping sequence generation means 1 variable. On the transmitting side, the difference between the timing of outputting the information signal 0 and the timing of outputting the information signal 1 may be controlled.
[0088]
On the other hand, on the receiving side, it is necessary to make the time length of the detection impulse signal variable. In FIG. 17, the detection impulse signal generation means 8 is controlled by the offset time difference control means 22 to vary the time length of the detection impulse signal. For example, a plurality of means capable of generating impulse signals having different time lengths from each other are easily provided, and these are switched according to the magnitude of the delay time Tδ to change the time length of the impulse signal input to the multiplication means. It is also suitable to configure.
[0089]
As described above, by changing the offset time difference even when the error rate increases due to the time position at which the multipath wave exists coincides with the offset time difference, the multipath wave exists. Since the temporal position and the offset time difference do not match, it is possible to prevent the error rate from increasing.
[0090]
(Embodiment 6)
FIG. 18 shows a block diagram of a UWB receiver according to Embodiment 6 of the present invention.
[0091]
The sixth embodiment of the present invention is a combination of the configuration of the fifth embodiment and a configuration in which a plurality of delay units of the fourth embodiment are provided, and a description will be given focusing on differences from the fifth embodiment and the fourth embodiment. I do.
[0092]
FIG. 18 shows a ninth embodiment using the present invention. In FIG. 18, the UWB receiving apparatus of the present invention has the configuration of FIG. 16 and further includes a branch from each delay means (19a, 19b, 19c, 19d). And a branch selecting unit 21 for selecting a branch to be input to the adding unit 20 according to the length of the offset time difference set on the transmitting side.
[0093]
For example, if the value of the delay time Tδ for changing the offset time difference on the transmitting side is 0, the branch selecting means 21 prevents all the branch outputs from being input to the adding means 20, and if Tδ is Ti, 19a If Tδ is 2Ti, 19a and 19b are selected. If Tδ is 3Ti, 19a, 19b and 19c are selected and input to the adding means 20.
[0094]
This is preferable because optimal reception performance can be obtained according to the offset time difference that adaptively changes.
[0095]
(Embodiment 7)
FIG. 19 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 7 of the present invention.
[0096]
FIG. 19 shows that, in addition to the configuration in FIG. 17 of the fifth embodiment, the time position and the magnitude of the multipath wave estimated on the receiving device 110 side are transmitted to the transmitting device 100 side as a delay profile, On the transmitting apparatus 100 side, the offset time difference control means 22 is configured to respond to the output from the multipath estimating means 23 for estimating the multipath wave generated in the propagation path.
[0097]
The result of the multipath estimation on the receiving device 110 side is multiplexed by the multiplexing means 38 together with other information signals and the like to the transmitting device 100 side, modulated by the modulating means 39, and transmitted through the duplexer 40. It is preferable to adopt a configuration. Multipath estimating means 23 for estimating the temporal position and magnitude of the multipath wave is provided, and offset time difference control means 22 for adaptively changing the offset time difference on the transmitting apparatus 100 side generates a multipath wave generated on the propagation path. It is configured to respond to the output from the multipath estimating means 23 for estimating waves.
[0098]
The multipath estimating means 23 derives a delay profile, which is an impulse response of the propagation path, checks whether or not the temporal position where the multipath wave exists matches the offset time difference. Is output, and an offset time difference that does not match is output to change the set value of the delay time in the shift time setting means 33 of the transmitting apparatus 100.
[0099]
The transmission of the delay profile from the receiving apparatus 110 to the transmitting apparatus 100 is configured to be transmitted together with the transmission of the information signal, and the receiving apparatus 110 converts the information signal and the delay profile from the signal transmitted with the information signal. Using the separated and separated delay profiles, the offset time difference control means 22 is controlled so that the impulse generation timing on the receiving device 110 side is also changed according to the changed offset time difference.
[0100]
For transmitting the delay profile, as shown in FIG. 19, a multiplexing unit 38 for multiplexing the information signal and the delay profile signal, a modulating unit 39 for modulating the multiplexed signal, a receiving signal and a modulating unit 39 And a duplexer 40 for switching between a transmission signal and an output of the transmission device 100. A duplexer 35 for switching between a transmission signal and a reception signal, a demodulator 36 for demodulating the output of the duplexer 35, and an output of the demodulator 36 are provided on the transmission device 100 side. It is preferable to configure demultiplexing means 37 for demultiplexing the information signal and the delay profile signal from the signal.
[0101]
With such a configuration, it is possible to minimize the influence of the multipath wave, and it is possible to easily realize a high-performance wireless communication device.
[0102]
(Embodiment 8)
FIG. 20 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 8 of the present invention.
[0103]
The UWB transmitting / receiving apparatus according to the eighth embodiment of the present invention has a configuration in which a multipath estimating unit 23 for estimating a temporal position and a size of a multipath wave is provided in addition to the configuration of FIG. 18 of the sixth embodiment. Therefore, the description will be focused on the points different from the sixth embodiment. As in the seventh embodiment, the means for adaptively changing the offset time difference on the transmitting side is configured to respond to the output from the multipath estimating means for estimating the multipath wave generated in the propagation path, and will be described in detail. Is omitted.
[0104]
The multipath estimating means 23 estimates whether or not the temporal position where the multipath wave exists coincides with the offset time difference, and if it does, the transmitting side changes the offset time difference so as not to coincide. .
[0105]
At the same time, the offset time difference control means 22 is controlled so that the impulse generation timing on the receiving side is also changed according to the changed offset time difference. Further, it controls the branch selecting means 21 for selecting a branch to be input to the adding means 20 according to the length of the set offset time difference.
[0106]
By doing so, the effect of the multipath wave can be minimized, and the optimum receiving performance can be obtained in accordance with the offset time difference that changes adaptively, which is preferable.
(Embodiment 9)
FIG. 21 is a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 9 of the present invention.
[0107]
The UWB transmitting / receiving apparatus according to the twelfth embodiment of the present invention includes, in addition to the configuration shown in FIG. 20 of the eighth embodiment, means for adaptively changing the delay amount in the delay means, and delay means 19a, 19b, The delay time Ta, Tb, Tc, Td of each of 19c and 19d is controlled so that the temporal position of the multipath wave is not overlapped with the information signal. 20 is different from FIG. 20 in the eighth embodiment in that the delay time of each of the delay means is not limited to an integral multiple of Ti. Other configurations and operations thereof are the same as those described above, and therefore, the description thereof is omitted. .
[0108]
This adaptive delay makes it possible to change not only the signal but also the time and phase of the multipath wave, so that an effect similar to that of rake reception is improved. Therefore, a high-performance wireless communication device with a small error rate can be realized. .
[0109]
(Embodiment 10)
FIG. 22 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 10 of the present invention.
[0110]
The UWB transmitting / receiving apparatus according to the thirteenth embodiment using the present invention includes, in addition to the configuration of FIG. 1 according to the first embodiment, a unit 24 that performs error correction coding of an information signal on a transmitting side and data determined on a receiving side. It is provided with a means 25 for performing error correction decoding, and the following description will focus on differences from the first embodiment.
[0111]
The error correction coding means 24 makes the transmission signal redundant in advance, and performs error correction coding so that the receiving device can correct the error.
On the other hand, the error correction decoding means 25 on the receiving side decodes the signal encoded on the transmitting side to obtain the original information signal.
[0112]
As described above, although the frequency use efficiency is reduced by the error correction coding, the throughput of the entire system including retransmission due to an error is improved, and a required code error rate can be achieved at a limited transmission power. This makes it possible to use limited frequency resources effectively.
[0113]
Although the embodiment in which the error correction encoding means is added to the configuration of the first embodiment has been described, the present invention is not limited to this, and the same effect can be obtained by adding it to the configuration of the second to ninth embodiments. Can be obtained.
[0114]
(Embodiment 11)
FIG. 23 shows a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 11 of the present invention.
[0115]
An UWB transmitting / receiving apparatus according to an eleventh embodiment of the present invention includes, in addition to the configuration shown in FIG. 1 of the first embodiment, a repetition number control means 26 for controlling a repetition period of an information signal on a transmission side, and an integration discharge means on a reception side. This is provided with a means 27 for controlling the eleventh integration section, and different points from the first embodiment will be mainly described.
[0116]
In the first embodiment, the number of repetitions of the information signal is the same as the period of the time hopping sequence and is fixed. However, in the present embodiment, the number of repetitions of the information signal is controlled by the repetition number control means 26 for controlling the number of repetitions of the information signal. To change. In response to a change in the number of repetitions on the transmission side, a means 27 for controlling the integration section of the integrating and discharging means 11 is provided on the reception side, and the integration section is controlled so as to integrate by the number of repetitions on the transmission side.
[0117]
With this configuration, when the propagation path condition is good and the error rate is low, the repetition period of the information signal can be shortened, and the transmission speed can be increased. It is preferable that the repetition period is adaptively controlled according to the state of the propagation path state.
[0118]
Although the embodiment in which the repetition control means 26 and the integration interval control means 27 are added to the configuration of the first embodiment has been described, the present invention is not limited to this, and is added to the configurations of the second to ninth embodiments. The same effect can be obtained.
[0119]
(Embodiment 12)
FIG. 24 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 12 of the present invention.
[0120]
The UWB transmitting / receiving apparatus according to the fifteenth embodiment of the present invention includes, in addition to the configuration shown in FIG. It is provided with a Viterbi decoding means 29 which receives an output from the means 11 and performs soft-decision Viterbi decoding. The following description will focus on differences from the first embodiment.
[0121]
In the present embodiment, the information signal is convolutionally encoded and transmitted by the convolutional encoding means 28, and the output signal from the integrating and discharging means 11 is input to the soft-decision Viterbi decoding means 29 on the receiving side, and the soft-decision Viterbi decoding is performed. I do.
[0122]
With such a configuration, it is possible to perform decoding with a lower error rate than when performing hard decision once on the output of the integral discharge means and then perform hard decision Viterbi decoding, thereby enabling high-performance communication.
[0123]
Although the embodiment in which the convolution encoding means 28 and the Viterbi decoding means 29 are added to the configuration of the first embodiment has been described, the present invention is not limited to this, and is added to the configurations of the second to ninth embodiments. However, the same effect can be obtained.
[0124]
(Embodiment 13)
FIG. 25 is a block diagram of a UWB transmitting / receiving apparatus according to Embodiment 13 of the present invention.
[0125]
The UWB transmitting / receiving apparatus according to the thirteenth embodiment of the present invention includes, in addition to the configuration shown in FIG. 1 of the first embodiment, a means 30 for turbo coding an information signal on the transmitting side and an output from the integrating and discharging means 11 on the receiving side. , And a turbo decoding unit 31 is provided, and the following description will focus on differences from the first embodiment.
[0126]
In the present embodiment, an information signal is turbo-coded by a turbo coding unit 30 and transmitted, and an output signal from the integrating and discharging unit 11 is input to a turbo decoding unit 29 on the receiving side to perform turbo decoding.
[0127]
With such a configuration, decoding can be performed with a lower error rate than when decoding is performed after the output from the integrating and discharging means is once hard-decided, and high-performance communication is possible. Although turbo decoding increases the circuit scale and causes decoding delay, it is preferable because an error rate characteristic lower than that of Viterbi decoding can be obtained.
[0128]
Although the embodiment in which the turbo encoding unit 30 and the turbo decoding unit 31 are added to the configuration of the first embodiment has been described, the present invention is not limited to this, and the configuration of the second to ninth embodiments is not limited thereto. The same effect can be obtained by adding.
[0129]
In FIG. 26, in addition to the above-described configuration, a means 32 for performing analog / digital conversion of the output of the integration discharge means on the receiving side is provided.
[0130]
As a result, the error correction capability of soft decision error correction decoding is higher than that of hard decision error correction decoding. When performing Viterbi decoding or turbo decoding, by converting the digital signal into a digital signal suitable for performing error correction signal processing, decoding with a low error rate can be easily performed.
[0131]
【The invention's effect】
As described above, according to the present invention, in the UWB transmitting / receiving apparatus, the offset time difference between information signals 0 and 1 is set longer on the transmission side than the generation time of the transmission impulse signal, and the generation of the detection impulse signal on the reception side is performed. By increasing the time correspondingly, the timing synchronization accuracy required for the system can be eased, and high-performance UWB transmission can be realized by a small and inexpensive device.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 1 of the present invention.
FIG. 2 is a diagram schematically illustrating a transmission-side impulse signal according to the related art.
FIG. 3 is a diagram schematically showing a receiving-side detection impulse signal according to a conventional technique.
FIG. 4 is a diagram schematically illustrating a receiving-side detection impulse signal according to the first embodiment of the present invention.
FIG. 5 is an explanatory diagram schematically showing the timing of a conventional transmission signal according to the first embodiment of the present invention.
FIG. 6 is an explanatory diagram schematically showing the timing of a transmission signal according to the first embodiment of the present invention.
FIG. 7 is an explanatory diagram schematically showing waveforms of two signals input to a multiplying unit for describing Embodiment 1 of the present invention;
FIG. 8 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 2 of the present invention.
FIG. 9 is a diagram schematically illustrating an example of a conventional receiving-side detection impulse signal for describing Embodiment 2 of the present invention.
FIG. 10 is a diagram schematically illustrating an example of a receiving-side detection impulse signal according to the second embodiment of the present invention;
FIG. 11 is an explanatory diagram schematically showing waveforms of two signals input to a multiplying means for describing Embodiment 2 of the present invention;
FIG. 12 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 3 of the present invention.
FIG. 13 is a diagram schematically illustrating an example of a receiving-side detection impulse signal of the present invention for describing Embodiment 3 of the present invention;
FIG. 14 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 4 of the present invention.
FIG. 15 is an explanatory diagram showing an outline of waveforms of two signals input to a multiplying means for describing Embodiment 4 of the present invention;
FIG. 16 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus provided with a plurality of delay units according to Embodiment 4 of the present invention.
FIG. 17 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 5 of the present invention.
FIG. 18 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 6 of the present invention.
FIG. 19 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to a seventh embodiment of the present invention.
FIG. 20 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 8 of the present invention.
FIG. 21 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 9 of the present invention.
FIG. 22 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 10 of the present invention.
FIG. 23 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 11 of the present invention.
FIG. 24 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 12 of the present invention.
FIG. 25 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 13 of the present invention.
FIG. 26 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to Embodiment 13 of the present invention.
FIG. 27 is a block diagram showing a configuration of a UWB transmitting / receiving apparatus according to a conventional technique.
[Explanation of symbols]
1 Time hopping sequence generation means
2 Impulse generation means
3 Power amplification means
4 transmitting antenna
5 receiving antenna
6 Low noise amplification means
7 Multiplication means
8 Impulse generation means
9 Time hopping sequence generation means
10 Synchronization means
11 Integral discharge means
12 Judgment means
13 Threshold setting means
14 M value judgment means
15 S / P conversion means
16 Sampling means
17 Maximum value judgment means
18 Demapping means
19 Delay means
20 Addition means
21 Branch selection means
22 Offset time difference control means
23 Multipath estimation means
24 error correction coding means
25 Error correction decoding means
26 Repetition number control means
27 Integration section control means
28 Convolutional coding means
29 Soft-decision Viterbi decoding means
30 Turbo coding means
31 Turbo decoding means
32 Analog / digital conversion means

Claims (25)

A time hopping sequence generating means for outputting a time hopping sequence, and a delay for selectively switching between a case where the time hopping sequence signal is output as it is and a case where the time hopping sequence signal is output with a delay according to a binary information signal (0 or 1) Selection means, shift time setting means for setting the delay time of the delay selection means to be equal to or longer than one impulse signal output time, and impulse generation means for generating an impulse signal at a signal timing output from the delay selection means And an amplifying means for amplifying the impulse signal, and an antenna means for radiating a signal from the amplifying means into the air. Time hopping sequence generating means for outputting a time hopping sequence, delay selecting means for selectively switching between a case where the time hopping sequence signal is output as it is and a case where the time hopping sequence signal is output with a delay according to an M-value information signal, Shift time setting means for setting the delay time of the delay selecting means to be equal to or longer than one impulse signal output time; impulse generating means for generating an impulse signal at a signal timing outputted from the delay selecting means; An ultra-wide band (UWB) transmission device, comprising: amplifying means for amplifying the signal; and antenna means for radiating a signal from the amplifying means into the air. 3. The ultra-wideband according to claim 1, wherein the shift time setting means has an offset time difference of an impulse signal to be generated which is N times (N: an integer of 2 or more) of one impulse signal output time. UWB) Transmitter. 4. The ultra-wideband (UWB) transmission device according to claim 1, wherein the shift time setting means changes the offset time difference adaptively. Antenna means for feeding a UWB signal radiated into the air, low noise amplifying means for amplifying the output signal from the antenna means with low noise, time hopping sequence generating means for generating a time hopping sequence, and the low noise amplifying means A synchronization means for establishing a synchronization between a time hopping sequence on the transmission side and a time hopping sequence generation means on the reception side from a signal from Detection impulse signal generation means for generating a detection impulse signal having an output time longer than the impulse signal output time; multiplication means for multiplying the signal from the low noise amplification means by the detection impulse signal; A product that integrates and discharges the output in synchronization with the cycle of the time hopping sequence Discharge means and determines around the threshold 0 receives the signal from the integrator discharging means, ultra-wideband (UWB) receiver system composed of a judging means for outputting information signals of binary. Antenna means for feeding a UWB signal radiated into the air, low noise amplifying means for amplifying the output signal from the antenna means with low noise, time hopping sequence generating means for generating a time hopping sequence, and the low noise amplifying means Means for establishing synchronization between the time hopping sequence on the transmission side and the time hopping sequence on the reception side from the signal from the multiplexing unit, and one impulse on the transmission side at a timing determined by the time hopping sequence synchronized by the synchronization means. A detection impulse signal generating means for generating a detection impulse signal having an output time longer than the signal output time; a multiplication means for multiplying the signal from the low noise amplification means by the detection impulse signal; Is integrated and discharged in synchronization with the cycle of the time hopping sequence. UWB (UWB) comprising means for receiving a signal from the integrating and discharging means, determining based on M-1 thresholds, and outputting an information signal of M value (M: an integer of 2 or more). ) Receiver. Antenna means for feeding a UWB signal radiated into the air, low noise amplifying means for amplifying the output signal from the antenna means with low noise, time hopping sequence generating means for generating a time hopping sequence, and the low noise amplifying means A synchronizing means for establishing synchronization between the transmission-side time hopping sequence and the time hopping sequence from the signal received from the transmitter, and N detection impulses for generating N different detection impulse signals at timings determined by the time hopping sequence. Signal generating means, N multiplying means for multiplying the signal from the low-noise amplifying means and the detection impulse signal, respectively, and integrating and discharging the outputs of the preceding N multiplying means in synchronization with the cycle of the time hopping sequence. The signals from the N integral discharging means and the N integral discharging means are N sampling means for sampling in synchronization with the cycle of the sampling sequence, absolute value maximum branch judging means for judging a branch having the largest absolute value among output signals from the N sampling means, An ultra-wide band (UWB) comprising a demapping means for receiving the output signal from the sampling means and the output signal from the maximum absolute value branch determining means and demapping and outputting the determination data as an M-value information signal. ) Receiver. 8. The detection impulse generating means according to claim 5, wherein the output time of the signal is N times (N: an integer of 2 or more) the output time of one impulse signal on the transmission side. Ultra wideband (UWB) receiver. Delay means for delaying the signal from the low noise amplifying means by the offset time difference between the binary information signals; and adding means for adding the output signal from the delay means and the signal from the low noise amplifying means. The ultra-wide band (UWB) receiving device according to any one of claims 5 to 8. N-1 delay means for delaying the signal from the low noise amplifying means by a delay time corresponding to the offset time difference between the information signals, an output of the N-1 delay means and a signal from the low noise amplifying means The ultra-wideband (UWB) receiving apparatus according to claim 5, further comprising an adding unit that adds: The ultra-wide band (UWB) receiving apparatus according to any one of claims 5 to 10, wherein the detection impulse generation means adaptively changes an output time of an impulse signal to be generated. Antenna means for feeding a UWB signal radiated into the air, low noise amplifying means for amplifying the output signal from the antenna means with low noise, time hopping sequence generating means for generating a time hopping sequence, and the low noise amplifying means A synchronizing means for establishing synchronization between the time hopping sequence on the transmitting side and the time hopping sequence from the signal from the transmitter, and one impulse signal output time on the transmitting side at a timing determined by the time hopping sequence synchronized by the synchronizing means. A detection impulse signal generating means for generating a detection impulse signal having a longer output time, and N-1 delays for delaying a signal from the low noise amplifying means by a delay time corresponding to an offset time difference between information signals. Means and said offset time difference from the output of said N-1 delay means. Branch selecting means for selecting the number of outputs of the (N-1) delay means to be added in response to the adaptive change, and the (N-1) delay means selected by the branch selecting means. Adding means for adding the output and the signal from the low-noise amplifying means; multiplying means for multiplying the signal from the adding means by the detection impulse signal; and integrating the output of the multiplying means in synchronism with the time hopping cycle. An ultra-wide band (UWB) receiving apparatus, comprising: an integrating discharge means for performing the above operation; 13. The ultra-wide band according to claim 11, further comprising a multipath estimating unit for estimating a multipath wave generated in the propagation path, wherein the offset time difference is adaptively changed according to an output from the multipath estimating unit. (UWB) receiving device. 13. The multipath estimating means for estimating a multipath wave generated in a propagation path, wherein the branch selecting means selects the number of outputs of the delay means according to the output from the multipath estimating means. Ultra wide band (UWB) receiver. Antenna means for feeding a UWB signal radiated into the air, low noise amplifying means for amplifying the output signal from the antenna means with low noise, time hopping sequence generating means for generating a time hopping sequence, and the low noise amplifying means A synchronizing means for establishing synchronization between the time hopping sequence on the transmitting side and the time hopping sequence from the signal from the transmitter, and one impulse signal output time on the transmitting side at a timing determined by the time hopping sequence synchronized by the synchronizing means. A detection impulse signal generating means for generating a detection impulse signal having a longer output time, a multipath estimating means for estimating a multipath wave generated in the propagation path, and a signal from the low noise amplifying means. The delay time is set so that the time position of the multipath wave does not overlap with the information signal. N-1 delay means, a branch selection means for selecting an output of the N-1 delay means from a time position of the multipath wave estimated by the multipath estimation means, and a branch selection means. Adding means for adding the selected outputs of the N-1 delay means and the signal from the low-noise amplifying means; multiplying means for multiplying the signal from the adding means by a detection impulse signal; An ultra-wide band (integral discharge means) comprising an integrating discharge means for integrating and discharging the output of the multiplying means in synchronization with the time hopping cycle, and a determining means for receiving a signal from the integrating discharge means, determining the signal based on a threshold 0, and outputting an information signal. UWB) receiver. An ultra-wide band (UWB) transmitting / receiving device comprising the ultra-wide band (UWB) transmitting device according to any one of claims 1 to 4 and the ultra-wide band (UWB) receiving device according to any one of claims 5 to 15. . The ultra-wideband (UWB) receiving apparatus according to claim 13, wherein the transmitting apparatus is notified of a multipath wave estimation result output of the multipath estimating means. The ultra-wide band (UWB) transmitter according to any one of claims 1 to 4, wherein an offset time from a timing determined by a time hopping sequence is determined by a signal obtained by performing error correction coding on an information signal. . 19. The ultra-wideband (UWB) transmitter according to claim 18, wherein the error correction coding uses convolutional coding. 20. A soft-decision Viterbi decoding means for soft-decision Viterbi decoding of a convolutionally coded signal transmitted from the ultra-wide band (UWB) transmission apparatus according to claim 19, from an integrated discharge output from said integration means. The ultra-wide band (UWB) receiving device according to any one of the above. 19. The ultra-wideband (UWB) transmitter according to claim 18, wherein the error correction coding uses turbo coding. The turbo-decoding means for turbo-decoding the turbo-coded signal transmitted from the ultra-wideband (UWB) transmission apparatus according to claim 21 and the integrated discharge output from said integration means is provided. Ultra-wideband (UWB) receiver as described. 5. The ultra-wide band (UWB) transmitter according to claim 1, wherein a repetition period of the information signal is adaptively shorter than a period of the time hopping sequence. An ultra-wide band (UWB) receiving apparatus according to any one of claims 5 to 15, further comprising integrating discharge means operating in synchronization with a repetition period of an information signal transmitted from the ultra wide band (UWB) transmitting apparatus according to claim 23. . 25. The ultra-wide band (UWB) receiving device according to claim 20, wherein the signal obtained by A / D converting the integrated discharge output is decoded.

Images