JP2019087972A - Impulse radio transmitting device and impulse radio communication device - Google Patents

Abstract

To provide an impulse radio transmitting device capable of improving the quality of transmission signals in multilevel modulation impulse communication.SOLUTION: An impulse generating unit (21) is configured to output impulses generated corresponding to clock signals. A filter (22) is configured to limit the frequency band of the impulses output from the impulse generating unit to a predetermined frequency band included in a milli-wave zone. A pulse modulation unit includes a pulse position modulation part which is configured to perform a pulse position modulation to shift the phase of the impulses input from the filter to a position corresponding to the data, which is a passive circuit which outputs modulated impulses.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an impulse radio transmitter and an impulse radio communication apparatus.

  In impulse radio communication, generally, on-off modulation (OOK: on-off keying) is used, which determines "1" or "0" of data based on the presence or absence of a pulse. Also, in order to improve the transmission speed, it is considered to multi-value the data. For example, data can be multi-valued by using pulse position modulation (PPM) that changes the pulse appearance position for each symbol.

Li et al., "Integrated VGA phase error compensation 60 GHz 5-bit PHASE SHIFTER WITH INTEGRATED VGA PHASE-ERROR COMPENSATION", IEEE Transactions on Microwave Theory and Technology (IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES), March 2013, VOL. 61, NO. 3, P. 1224-1235 Sjogren et al., "A Low Phase-Error 44-GHz HEMT Attenuator", IEEE MICROWAVE AND GUIDED WAVE LETTERS, May 1998, VOL. 8, No. 6, P. 194-195

International Publication No. 2015/049740

  The PPM circuit performs pulse position modulation to change the pulse appearance position by delaying the clock signal with a different delay time according to data. However, jitter (fluctuation of the signal waveform in the time axis direction) occurs in the pulse signal delayed by the PPM circuit, so it is difficult to achieve pulse position accuracy capable of appropriate demodulation of the communication signal. There is.

  An object of the present invention is, as one aspect, to improve the quality of a transmission signal of multilevel modulation impulse communication.

  In one aspect, the impulse radio transmitter includes an impulse generating unit that outputs an impulse generated according to a clock signal, and a frequency band of impulses output from the impulse generating unit in a predetermined frequency band included in the millimeter wave band. And a limiting filter. The impulse radio transmitter also includes a pulse position modulation unit that performs pulse position modulation to shift the phase of an impulse input from the filter to a position according to data, and is a passive circuit that outputs a modulated impulse. It has a modulation part.

  As one aspect, the quality of the transmission signal of multilevel modulation impulse communication can be improved.

It is a block diagram which shows an example of the impulse radio | wireless communication apparatus which concerns on 1st Embodiment. It is a block diagram showing an example of an impulse radio transmitter concerning a 1st embodiment. It is a block diagram showing an example of a pulse position modulation part concerning a 1st embodiment. It is a circuit diagram showing an example of a phase shift part concerning a 1st embodiment and a 2nd embodiment. It is a circuit diagram which shows an example of the equivalent circuit of FIG. 4A. It is a circuit diagram which shows an example of the equivalent circuit of FIG. 4A. It is a block diagram showing an example of a pulse position modulation part concerning a 1st embodiment. It is a block diagram which shows an example of the impulse radio | wireless transmitter which concerns on 2nd Embodiment. It is a block diagram which shows an example of the pulse modulation part which concerns on 2nd Embodiment. It is a circuit diagram showing an example of the parallel amplitude reduction part concerning a 2nd embodiment. It is a block diagram showing an example of an impulse radio transmitter concerning a related art. It is a conceptual diagram which shows an example of the pulse signal which the phase shifted which concerns on related technology. It is a conceptual diagram which shows an example of the demodulated communication signal which concerns on related technology. It is a conceptual diagram which shows an example of the demodulated communication signal which concerns on 1st Embodiment. It is a conceptual diagram which shows an example of the demodulated communication signal which concerns on related technology. It is a conceptual diagram which shows an example of the demodulated communication signal which concerns on 1st Embodiment.

First Embodiment
Hereinafter, an example of the first embodiment will be described in detail with reference to the drawings.

  FIG. 1 illustrates the main functions of the impulse radio communication device 1.

  The impulse radio communication device 1 includes a baseband unit 10, a transmitter 20, a receiver 30, a diplexer 40, and an antenna 60. The baseband unit 10 outputs transmission data to the transmitter 20. Further, the baseband unit 10 reproduces the received data from the signal input from the receiver 30.

  The receiver 30 amplifies the signal input from the diplexer 40, detects the envelope of the amplified signal, amplifies the detected signal, and outputs the amplified signal to the baseband unit 10.

  In the duplex method, by allocating different frequencies in the uplink and downlink, wireless communication using a wide frequency band in each direction can be performed. The diplexer 40 has a function to electrically separate the transmission path and the reception path, and outputs the signal input from the antenna 60 to the receiver 30 and the signal output from the transmitter 20 to the antenna 60. Output.

  The antenna 60 wirelessly transmits the transmission signal input from the diplexer 40, and outputs the radio reception signal received to the diplexer 40.

  Although the impulse radio communication apparatus 1 including the transmitter 20 and the receiver 30 has been described, the impulse radio communication apparatus 1 may include only the transmitter 20. That is, the impulse radio communication device 1 may not include the receiver 30 and the diplexer 40. Also, the impulse radio communication device 1 may include only the receiver 30. That is, the impulse radio communication device 1 may not include the transmitter 20 and the diplexer 40.

  FIG. 2 exemplifies essential functions of the transmitter 20.

  The transmitter 20 includes an impulse generation unit 21, a filter 22, a pulse position modulation unit 23 (hereinafter, PPM unit 23) which is an example of a pulse modulation unit, and an amplification unit 25. The impulse generating unit 21 generates an impulse according to the clock signal CLK. An impulse is a pulse whose pulse width which changes sharply on the time axis is extremely short.

  The filter 22 is a band pass filter that limits the frequency band of the impulse input from the impulse generating unit 21 to a predetermined frequency band included in the millimeter wave band. The pass frequency band of the band pass filter may be, for example, 81 GHz to 86 GHz. As a result, impulses in the 81 GHz to 86 GHz band are output from the filter 22.

  In the millimeter wave band, frequencies can be used in a wide band, and among the millimeter wave bands, the 80 GHz band is hardly affected by the atmosphere. Although an example in which the filter 22 is disposed between the impulse generation unit 21 and the PPM unit 23 has been described, the present embodiment is not limited to this, and between the PPM unit 23 and the amplification unit 25, The filter 22 may be arranged.

  The amplification unit 25 amplifies the impulse input from the PPM unit 23 and outputs the amplified impulse to the diplexer 40.

  FIG. 3 exemplifies main functions of the PPM unit 23.

  PPM unit 23 includes parallel phase shift units 23P1 and 23P2. The parallel phase shift unit 23P1 includes a phase shift unit 23A connected in parallel, which shifts the phase of the pulse by 180 degrees, and a phase shift unit 23B which shifts the phase of the pulse by 0 degree. Parallel phase shift unit 23P1 also includes switches SW11 and SW12 that switch the signal path to either phase shift unit 23A or 23B. The parallel phase shift unit 23P2 includes a phase shift unit 23C connected in parallel, which shifts the phase of the pulse by 90 degrees, and a phase shift unit 23D which shifts the phase of the pulse by 0 degree. Parallel phase shift unit 23P2 also includes switches SW13 and SW14 that switch the signal path to either phase shift unit 23C or 23D.

  When the switches SW11 and SW12 switch the signal path to the phase shift unit 23B and the switches SW13 and SW14 switch the signal path to the phase shift unit 23D, the phase of the pulse input to the switch SW11 is shifted by 0 degrees, and the switch SW14 Output from

  When the switches SW11 and SW12 switch the signal path to the phase shift unit 23B, and the switches SW13 and SW14 switch the signal path to the phase shift unit 23C, the phase of the pulse input to SW11 is shifted by 90 degrees, and from the switch SW14 It is output.

  When the switches SW11 and SW12 switch the signal path to the phase shift unit 23A, and the switches SW13 and SW14 switch the signal path to the phase shift unit 23D, the phase of the pulse input to the switch SW11 is shifted 180 degrees, and from the switch SW14 It is output.

  When the switches SW11 and SW12 switch the signal path to the phase shift unit 23A and the switches SW13 and SW14 switch the signal path to the phase shift unit 23C, the phase of the pulse input to the SW11 is shifted 270 degrees, and from the switch SW14 It is output.

  The switches SW11 to SW14 are switched according to the data D.

  FIG. 4A exemplifies a phase shift unit that performs the same operation as each of the parallel phase shift units 23P1 and 23P2 of FIG. 3 but not the phase shift units connected in parallel. The phase shift unit illustrated in FIG. 4A is a passive circuit in which passive elements are combined. A passive element is an element that consumes, stores, and releases supplied power, and does not perform active operation such as amplification and rectification.

The phase shift unit includes three coils L ₁₁ , L ₁₂ , L ₂ , three transistors Q ₁ , Q ₂ , Q ₃ and three resistors R _A , R _B , R _C. The transistors Q ₁ , Q ₂ and Q ₃ may be NMOS (n-Channel Metal-Oxide Semiconductor). The gate of the transistor Q ₁ is the second end of the resistor R _A of the first end is connected to a control terminal V _CP is connected, the first end of the coil L ₁₁ is connected to the drain, the coil to a source The first end of L ₁₂ is connected.

The first end of the drain and the coil _{L 11} of the transistor _{Q 1} is an input terminal IN is connected to a first end of the source and the coil _{L 12} of the transistor _{Q 1} is the output terminal OUT is connected. Equal to the inductance of the coil _{L 12} of the coil _{L 11.}

Second end each other of the two coils _{L 11} and _{L 12} are connected. The gate of the transistor Q ₂ is a first terminal connected to a second end of the resistor R _B, which is connected to a control terminal V _CP, the source is connected to the second end of the coil L ₁₁ and L _12. The drain of the transistor Q ₂ is the source and the first end of the coil L ₂ of the transistor Q ₃ is connected.

The gate of the transistor Q ₃ are the second end of the resistor R _C to the first end is connected to a control terminal V _CN are connected, the first end of the coil L ₂ is connected to the source, drain, and a coil L the second end of ₂ is grounded.

FIG. 4B is an equivalent circuit in the case where the control voltage 0 [V] is applied to the control terminal V _CP and the control voltage Vc [V] is applied to the control terminal V _CN in the circuit of FIG. 4A. That is, the control voltage via a resistor _{R A} to the transistor _{Q 1} 0 [V] is applied to the control voltage via a resistor _{R B} to the transistor _{Q 2} 0 [V] is applied, a resistor _{R C} to the transistor _{Q 3} It is an equivalent circuit in case control voltage Vc [V] is applied via.

In the equivalent circuit of Figure 4B, a second end of the second end and the coil _{L 12} of the coil _{L 11} is connected to the parasitic capacitance _C ^{2 *} of the first end of the transistor _{Q 2,} the parasitic capacitance _C ^{2 *} of the second end There is grounded via the drain-source on-resistance _{R on3} of the transistor _{Q 3.}

In this case, the phase of the pulse input from the input terminal IN is shifted by an amount determined based on the inductance and the like of the coils L ₁₁ and L ₁₂ .

FIG. 4C is an equivalent circuit in the case where the control voltage Vc [V] is applied to the control terminal V _CP and the control voltage 0 [V] is applied to the control terminal V _CN in the circuit of FIG. 4A. That is the control voltage Vc through the resistor _{R A} to the transistor _{Q 1} [V] is applied, the control voltage Vc through the resistor _{R B} in the transistor _{Q 2} [V] is applied, a resistor _{R C} to the transistor _{Q 3} It is an equivalent circuit in case control voltage 0 [V] is applied via it. In the equivalent circuit of FIG. 4C, between the input terminal IN and the output terminal OUT, the coil L ₃ (the inductance of L ₃ is one half of the inductance of L ₁₁ , ie, one half of the inductance of L ₁₂ ) The first end is connected. The second end of the coil _{L 3} is connected to the first end of the drain-source on-resistance _{R on2} transistor _{Q 2,} the parasitic capacitance of the first end and the transistor _{Q 3} second end of the coil _{L 2} of the resistor _{R on2} C Connected to the first end of ₃ ^* . The second end and the parasitic capacitance _C ^{3 *} of the second end of the coil _{L 2} is grounded.

  In this case, the phase of the pulse input from the input terminal IN is not shifted. That is, the phase of the pulse is shifted by 0 degrees.

  The PPM unit 23 of the present embodiment is a passive circuit in which passive elements are combined. In this embodiment, since the signal of the millimeter wave band having a short wavelength is used, the size of each passive element is small and the area occupied by the passive circuit does not increase, so that the PPM unit 23 can be mounted by the passive circuit. Further, since the PPM unit 23 is a passive circuit to which no DC bias current is applied, noise derived from the power supply, in particular, flicker noise (1 / f noise) can be suppressed.

  In the passive circuit of the present embodiment, a transistor generally regarded as an active element is used as a switch. However, since a direct current bias is not applied between the drain and the source, that is, the transistor is not used as an amplification element, in the present embodiment, the transistor is also a passive element.

  Next, the operation of the transmitter 20 will be described using FIG. In the transmitter 20, the impulse generating unit 21 generates an impulse for each clock based on the clock signal CLK, and outputs the impulse to the filter 22. The filter 22 limits the frequency band of the input impulse to a predetermined frequency band included in the millimeter wave band, and outputs the result to the PPM unit 23. The PPM unit 23 performs pulse position modulation according to the data D on the input impulse, and outputs the result to the amplification unit 25. The amplification unit 25 amplifies the input impulse and outputs the amplified impulse to the diplexer 40.

  Although FIG. 3 illustrates an example in which two parallel phase shift units in which two phase shift units are connected in parallel are connected in series, that is, an example of four-value modulation, the present embodiment is not limited to this. Three or more parallel phase shift units may be connected in series. For example, a parallel phase shift unit in which a phase shift unit that shifts the phase of the pulse by 45 degrees and a phase shift unit that shifts the phase of the pulse by 0 degree are connected in series to form eight-value modulation. be able to. As described above, it is possible to easily perform multilevel modulation by serially connecting parallel phase shift units in which two phase shift units are connected in parallel and increasing the number of parallel phase shift units connected in series. It becomes. Similarly, by connecting the phase shift units illustrated in FIG. 4A in series and increasing the number of phase shift units connected in series, it is possible to easily perform multilevel modulation.

  On the other hand, as illustrated in FIG. 5, all of the phase shift units 23E, 23F, 23G, and 23H may be connected in parallel. The phase shift unit 23 E shifts the phase of the pulse by 0 degrees, the phase shift unit 23 F shifts the phase of the pulse by 90 degrees, the phase shift unit 23 G shifts the phase of the pulse by 180 degrees, and the phase shift unit 23 H Shift 270 degrees.

  When the switches SW21 and SW22 switch the signal path to the phase shift unit 23E, the pulse input to the switch SW21 is shifted by 0 degrees and is output from the switch SW22. When the switches SW21 and SW22 switch the signal path to the phase shift unit 23F, the pulse input to the switch SW21 is shifted by 90 degrees and output from the switch SW22.

  When the switches SW21 and SW22 switch the signal path to the phase shift unit 23G, the pulse input to the switch SW21 is shifted by 180 degrees and output from the switch SW22. When the switches SW21 and SW22 switch the signal path to the phase shift unit 23H, the pulse input to the switch SW21 is shifted by 270 degrees and output from the switch SW22.

  As described above, the impulse radio transmitter according to the present embodiment includes, in the millimeter wave band, an impulse generating unit that outputs an impulse generated according to a clock signal, and a frequency band of impulses output from the impulse generating unit. And a filter for limiting to a predetermined frequency band. The impulse radio transmitter also includes a pulse position modulation unit that performs pulse position modulation to shift the phase of an impulse input from the filter to a position according to data, and is a passive circuit that outputs a modulated impulse. And a modulation unit.

  The present embodiment is characterized in that pulse modulation that can be performed in a low frequency band is performed in a millimeter wave band considered to be technically difficult. In the present embodiment, by performing pulse modulation in the millimeter wave band, it is possible to miniaturize the pulse modulation unit, which is a passive circuit, and to suppress the noise of the transmission signal by the passive circuit which can be implemented by miniaturizing. Is possible. Thus, in the present embodiment, it is possible to improve the quality of the transmission signal of multilevel modulation impulse communication.

Second Embodiment
Next, an example of the second embodiment will be described. Descriptions of configurations and operations similar to those of the first embodiment will be omitted.

  The transmitter 20A of 2nd Embodiment is illustrated in FIG. The difference between the transmitter 20 of the first embodiment and the transmitter 20A of the second embodiment is that the transmitter 20A of the second embodiment has a pulse amplitude modulator 24 (hereinafter referred to as a pulse amplitude modulator 24) between the PPM unit 23 and the amplifier 25. It is to have a PAM unit 24). The PPM unit 23 and the PAM unit 24 are examples of a pulse modulation unit.

  FIG. 7 illustrates an outline of the PPM unit 23 and the PAM unit 24 of the transmitter 20A.

  The PPM unit 23 is the same as that of the first embodiment, and thus the description thereof is omitted. The PAM unit 24 includes, for example, switches SW31 and SW32, a parallel amplitude in which an amplitude reduction unit 24A that attenuates the amplitude of the pulse by 3 dB, that is, reduces it, and an amplitude reduction unit 24B that attenuates the pulse amplitude by 0 dB are connected in parallel. The reduction unit 24P is included. When the switches SW31 and SW32 switch the signal path to the amplitude reduction unit 24A, the pulse input to the switch SW31 is attenuated by 3 dB and output from the switch SW32. When the switches SW31 and SW32 switch the signal path to the amplitude reducing unit 24B, the pulse input to the switch SW31 is attenuated by 0 dB and output from the switch SW32.

  The switches SW31 and SW32 are switched according to the data D.

  The PAM unit 24 is also a passive circuit in which passive elements are combined as in the PPM unit 23.

  The parallel amplitude reduction part which is a passive circuit is illustrated in FIG.

Parallel amplitude reduction unit includes a transistor _Q 21 which functions as a switch _{SW31, Q 22, Q 25,} Q 26 and resistors _{R 2A, R 2B, R 2H} , and _{R 2I.} The gate of the transistor _{Q 21} is connected via a resistor _{R 2A,} is connected to a control terminal _{V CP,} the drain is connected to the input terminal IN, a source connected to the source of the transistor _{Q 22.} The gate of the transistor _{Q 22} is connected via a resistor _{R 2B,} is connected to a control terminal _{V CP,} the drain is grounded.

The gate of the transistor _{Q 25} is connected via a resistor _{R 2H,} connected to the control terminal _{V CN,} the drain is connected to the input terminal IN, a source connected to the source of the transistor _{Q 26.} The gate of the transistor _{Q 26} is connected via a resistor _{R 2I,} is connected to a control terminal _{V CN,} the drain is grounded.

Parallel amplitude reduction unit includes a transistor _Q 23 which functions as a switch _{SW32, Q 24, Q 27,} Q 28 and resistors _{R 2F, R 2G, R 2J} , the _{R 2K.} The gate of the transistor _{Q 24} is connected via a resistor _{R 2G,} it is connected to a control terminal _{V CP,} the source is connected to the output terminal OUT, and a drain connected to the source of the transistor _{Q 23.} The gate of the transistor _{Q 23} is connected via a resistor _{R 2F,} is connected to a control terminal _{V CP,} the drain is grounded.

The gate of the transistor _{Q 28} is connected via a resistor _{R 2K,} it is connected to a control terminal _{V CN,} the source is connected to the output terminal OUT, and a drain connected to the source of the transistor _{Q 27.} The gate of the transistor Q ₂₇ is connected to the control terminal V _CN via the resistor R 2 _J , and the drain is grounded.

The parallel amplitude reduction unit includes resistors R _2C , R _2D , and R _2E that function as a first amplitude reduction unit. The first end of the resistor R _{2 D} is connected to the source of the transistor Q ₂₂ and the first end of the resistor R _{2 C} , and the second end of the resistor R _{2 D} is connected to the source of the transistor Q ₂₃ and the first end of the resistor R _{2 E} . The second ends of the resistors R _{2 C} and R _{2 E} are grounded. Signal path between the source and the source of the transistor Q ₂₇ of the transistor Q ₂₆ is equivalent to the second amplitude reduction unit. Transistor _Q 21 _{~Q 28} may be a NMOS.

When the control voltage Vc [V] is applied to the control terminal V _CP and the control voltage 0 [V] is applied to the control terminal V _CN , a first amplitude including the resistors R _2C , R _2D and R _2E in the signal path It is switched to the reduction unit. The amplitude of the pulse input from the input terminal IN is reduced by a predetermined magnitude and output from the output terminal OUT. In this case, the amplitude of the input from the input terminal IN pulse is reduced by an amount determined on the basis of such resistance value of the resistor R _2D.

When the control voltage 0 [V] is applied to the control terminal V _CP and the control voltage Vc [V] is applied to the control terminal V _CN , the signal path does not include the resistors R _2C , R _2D , and R _2E It is switched to the amplitude reduction unit. The amplitude of the pulse input from the input terminal IN is not reduced and is output from the output terminal OUT. That is, the amplitude of the pulse input from the input terminal IN is reduced by 0 [dB].

  Although FIG. 6 illustrates an example in which the pulse output from the PPM unit 23 is pulse amplitude modulated by the PAM unit 24, the present embodiment is not limited to this. The PPM unit 23 may be disposed downstream of the PAM unit 24 so that the pulse position modulation of the pulse output from the PAM unit 24 is performed by the PPM unit 23. Further, although only one parallel amplitude reduction unit 24P is connected in series to the pulse position modulation unit 23 in FIG. 7, the present embodiment is not limited to this. Two or more parallel amplitude reduction units in which two amplitude reduction units are connected in parallel may be connected in series with the pulse position modulation unit 23. Although eight-value modulation is performed in the example of FIG. 7, for example, 16-value modulation becomes possible by using two parallel amplitude reduction units.

  Further, FIG. 7 exemplifies a parallel amplitude reduction unit in which two amplitude reduction units are connected in parallel, but three or more amplitude reduction units are connected in parallel as in the PPM unit illustrated in FIG. May be

  As described above, the impulse radio transmitter according to the present embodiment includes, in the millimeter wave band, an impulse generating unit that outputs an impulse generated according to a clock signal, and a frequency band of impulses output from the impulse generating unit. And a filter for limiting to a predetermined frequency band. The impulse radio transmitter also includes a pulse position modulation unit that performs pulse position modulation to shift the phase of an impulse input from the filter to a position according to data, and is a passive circuit that outputs a modulated impulse. And a modulation unit.

  The present embodiment is characterized in that pulse modulation that can be performed in a low frequency band is performed in a millimeter wave band considered to be technically difficult. In the present embodiment, by performing pulse modulation in the millimeter wave band, it is possible to miniaturize the pulse modulation unit, which is a passive circuit, and to suppress the noise of the transmission signal by the passive circuit which can be implemented by miniaturizing. Is possible. Thus, in the present embodiment, it is possible to improve the quality of the transmission signal of multilevel modulation impulse communication.

  Further, in the present embodiment, in addition to pulse position modulation, the pulse modulation unit further performs pulse amplitude modulation to reduce the amplitude of an impulse.

  If multi-value modulation is performed only by pulse position modulation, the inter-signal distance becomes short, and there is a high possibility that appropriate demodulation can not be performed due to the influence of jitter. In the present embodiment, by combining pulse position modulation and pulse amplitude modulation, it is possible to prevent the inter-signal distance from becoming too short and to improve the resistance to jitter.

[Related Art]
A related art impulse radio transmitter 80 is illustrated in FIG. The transmitter 80 includes a PPM unit 83, an impulse generation unit 81, a filter 82, and an amplification unit 85. The difference from the impulse radio transmitter 20 illustrated in FIG. 2 is that in the transmitter 20, the PPM unit 23, which is a passive circuit, is disposed downstream of the impulse generation unit 21, while in the transmitter 80, the PPM unit It is a point that the impulse generating unit 81 is disposed at the latter stage of 83. The PPM unit 83 of the transmitter 80 is not a passive circuit.

  The PPM unit 83 modulates the pulse position by delaying the clock signal CLK as illustrated in FIG. The horizontal axis of each figure illustrating the pulse of FIG. 10 represents time, and the vertical axis represents voltage. The delay time is determined according to the data D. The period of the communication signal of 83.5 GHz is 12 ps (= 1 / 83.5 GHz), and in 4-value (2-bit) modulation, the clock signal CLK is 3 ps between each value to delay 90 degrees as a phase. Delay by (= 12 ps / 4).

  In this case, it is difficult to demodulate the communication signal unless the positional accuracy of the pulse is 100 fs or less and the phase is 3 degrees (100 fs = (3 ps / 90 degrees) × 3 degrees) or less. However, when pulse position modulation is performed by the PPM unit 83, jitter having a width of 500 fs or more occurs in the pulse, and it is difficult to suppress the position accuracy of the pulse to 100 fs or less.

  The eye pattern of the simulation result of the demodulation signal of a related art is illustrated in FIG. 11A, and the eye pattern of the simulation result of the demodulation signal of the first embodiment is illustrated in FIG. 11B. The horizontal axis of FIGS. 11A and 11B represents time, and the vertical axis represents voltage. In FIG. 11A, the lines are thicker than in FIG. 11B, that is, the lines are shifted, and the influence of jitter appears. On the other hand, FIG. 11B shows that the lines are thin, that is, the lines overlap, and the quality of the transmission signal is improved.

  FIG. 12A illustrates a constellation of simulation results of the demodulation signal of the related art, and FIG. 12B illustrates a constellation of simulation results of the demodulation signal of the first embodiment. The vertical axes of FIGS. 12A and 12B represent voltage values of orthogonal data, and the horizontal axes represent voltage values of in-phase data. In FIG. 12A, the signal points are spread and present compared to FIG. 12B, and the influence of jitter appears. On the other hand, FIG. 12B shows that the signal points overlap and the quality of the transmission signal is improved.

  In the present embodiment, a passive circuit is used in the pulse modulation unit. In this embodiment, since pulse modulation is performed in a short millimeter wave band of a waveform, the size of each passive element is small and the area occupied by the passive circuit does not increase. Therefore, it is possible to mount a pulse modulation unit by the passive circuit. On the other hand, in the related art, since pulse modulation is performed at a low frequency, using a passive circuit in the PPM unit 83 increases the size of each passive element because a signal with a long wavelength is used, and the area occupied by the passive circuit increases. , Really difficult to implement.

  Further, the following appendices will be disclosed regarding each of the above embodiments.

(Supplementary Note 1)
An impulse generating unit that outputs an impulse generated according to the clock signal;
A filter that limits the frequency band of impulses output from the impulse generator to a predetermined frequency band included in a millimeter wave band;
A pulse modulation unit, which is a passive circuit, includes a pulse position modulation unit that performs pulse position modulation to shift the phase of an impulse input from the filter at a position according to data, and outputs a modulated impulse;
Includes an impulse radio transmitter.
(Supplementary Note 2)
The pulse position modulation unit includes at least one phase shift unit that shifts the phase of the input impulse by different amounts.
The impulse radio transmitter of appendix 1.
(Supplementary Note 3)
When the pulse position modulation unit includes at least two parallel phase shift units in which two phase shift units are connected in parallel, the parallel phase shift units included in the pulse position modulation unit are connected in series.
The impulse radio transmitter of appendix 2.
(Supplementary Note 4)
The pulse modulation unit is connected in series with the pulse position modulation unit, and a pulse amplitude modulation unit that reduces the amplitude of an input impulse.
The impulse radio transmitter according to any one of appendices 1 to 3.
(Supplementary Note 5)
The pulse amplitude modulation unit includes at least one parallel amplitude reduction unit in which a plurality of amplitude reduction units that reduce the amplitude of an input impulse by different amounts respectively are connected in parallel.
The impulse radio transmitter of appendix 4.
(Supplementary Note 6)
When the pulse amplitude modulation unit includes at least two parallel amplitude reduction units in which two amplitude reduction units are connected in parallel, the parallel amplitude reduction units included in the pulse amplitude modulation unit are connected in series.
The impulse radio transmitter of appendix 5.
(Appendix 7)
An impulse generating unit that outputs an impulse generated according to a clock signal;
A filter that limits the frequency band of impulses output from the impulse generator to a predetermined frequency band included in a millimeter wave band;
A pulse modulation unit, which is a passive circuit, includes a pulse position modulation unit that performs pulse position modulation to shift the phase of an impulse input from the filter at a position according to data, and outputs a modulated impulse;
Impulse radio transmitter, including
An impulse radio communication device, including:
(Supplementary Note 8)
The pulse position modulation unit includes at least one phase shift unit that shifts the phase of an input impulse by different amounts.
Appendix 7. The impulse radio communication apparatus of appendix 7.
(Appendix 9)
When the pulse position modulation unit includes at least two parallel phase shift units in which two phase shift units are connected in parallel, the parallel phase shift units included in the pulse position modulation unit are connected in series.
The impulse radio communication device according to appendix 8.
(Supplementary Note 10)
The pulse modulation unit is connected in series with the pulse position modulation unit, and a pulse amplitude modulation unit that reduces the amplitude of an input impulse.
The impulse radio communication apparatus according to any one of appendices 7-9.
(Supplementary Note 11)
The pulse amplitude modulation unit includes at least one parallel amplitude reduction unit in which a plurality of amplitude reduction units that reduce the amplitude of an input impulse by different amounts respectively are connected in parallel.
Appendix 10. The impulse wireless communication device of appendix 10.
(Supplementary Note 12)
When the pulse amplitude modulation unit includes at least two parallel amplitude reduction units in which two amplitude reduction units are connected in parallel, the parallel amplitude reduction units included in the pulse amplitude modulation unit are connected in series.
The impulse radio | wireless communication apparatus of appendix 11.

1 Impulse Radio Communication Device 20, 20A Transmitter 21 Impulse Generator 22 Filter 23 Pulse Position Modulator 24 Pulse Amplitude Modulator

Claims (7)

An impulse generating unit that outputs an impulse generated according to the clock signal;
A filter that limits the frequency band of impulses output from the impulse generator to a predetermined frequency band included in a millimeter wave band;
A pulse modulation unit, which is a passive circuit, includes a pulse position modulation unit that performs pulse position modulation to shift the phase of an impulse input from the filter at a position according to data, and outputs a modulated impulse;
Includes an impulse radio transmitter. The pulse position modulation unit includes at least one phase shift unit that shifts the phase of an input impulse by different amounts.
The impulse radio transmitter according to claim 1. When the pulse position modulation unit includes at least two parallel phase shift units in which two phase shift units are connected in parallel, the parallel phase shift units included in the pulse position modulation unit are connected in series.
The impulse radio transmitter according to claim 2. The pulse modulation unit is connected in series with the pulse position modulation unit, and a pulse amplitude modulation unit that reduces the amplitude of an input impulse.
The impulse radio transmitter according to any one of claims 1 to 3. The pulse amplitude modulation unit includes at least one parallel amplitude reduction unit in which a plurality of amplitude reduction units that reduce the amplitude of an input impulse by different amounts respectively are connected in parallel.
The impulse radio transmitter according to claim 4. When the pulse amplitude modulation unit includes at least two parallel amplitude reduction units in which two amplitude reduction units are connected in parallel, the parallel amplitude reduction units included in the pulse amplitude modulation unit are connected in series.
The impulse radio transmitter according to claim 5. The impulse radio transmitter according to any one of claims 1 to 6.
An impulse radio communication device, including: