JP2011119807A - Radio apparatus and radio communication method of the same - Google Patents

Abstract

An object of the present invention is to prevent sensitivity deterioration due to an influence of an interference wave generated due to an internal oscillator in a wireless device that switches a plurality of channels and uses a broadband frequency.
A wireless device according to the present invention receives a wireless signal at a switchable reception frequency, and interferes with a wireless signal received by the receiving unit 21, thereby increasing the reception sensitivity of the wireless device to a predetermined level or more. Based on the detection results of the interference wave detection unit 30, the oscillators 12, 14, 16 that oscillate at a variable oscillation frequency, and the detection results of the interference wave detection unit 30, And a clock control unit 40 which is a control unit for controlling the oscillation frequency.
[Selection] Figure 1

Description

  The present invention relates to a radio apparatus and a radio communication method therefor, and more particularly to a technique for preventing deterioration in reception sensitivity of a radio apparatus capable of switching a plurality of reception channels.

  In order to prevent the reception sensitivity of the wireless device from being lowered due to interference between the reception signal and the oscillation signal in the wireless device, a wireless device as disclosed in Patent Document 1 has been proposed. The wireless device disclosed in Patent Document 1 controls the oscillation frequency of the oscillator so that it can be switched in conjunction with the switching of the reception frequency of the received signal, and avoids oscillation at a frequency that becomes an interference wave that lowers the reception sensitivity. is there.

  The switching value of the oscillation frequency of this oscillator was determined at the design stage.

Japanese Patent Laid-Open No. 06-260960

  There are often multiple oscillators in a wireless device that can generate jamming waves, and the jamming waves that cause a reduction in reception sensitivity include harmonics of these multiple oscillators and their combined waves. . Further, due to the structure in the housing of the wireless device, the frequency of the signal that actually interferes is different from the ideal frequency derived from the set value in the oscillator. In addition, in a radio apparatus having a wideband reception frequency that uses a plurality of channels by switching, it is necessary to eliminate interference waves in all receivable channels, that is, frequency bands, which is difficult.

  In addition, the harmonics of a plurality of oscillators, their combined waves, and the frequency of the interference wave that varies depending on the structure within the housing of the wireless device can be specified theoretically or experimentally at the design stage. However, in reality, the oscillation frequency of the oscillator is not uniquely determined for all individuals for a long time due to the deterioration of the oscillator over time or the displacement of the structure in the housing for each individual. There is a problem with the conventional method of determining at the design stage.

  The present invention has been made to solve the above problems, and in a wireless device that is mass-produced and used for a long time, the sensitivity is effectively degraded regardless of the aging of the oscillator or the difference in the structure of the housing. It is an object of the present invention to provide a wireless device and a wireless communication method thereof.

  A radio apparatus according to the present invention includes a receiver that receives a radio signal at a switchable reception frequency, and an interference that lowers a reception sensitivity of the radio apparatus beyond a predetermined level by interfering with the radio signal received by the receiver. An interference wave detection unit that detects a wave, an oscillator that oscillates at a variable oscillation frequency, and a control unit that controls the oscillation frequency of the oscillator based on a detection result in the interference wave detection unit.

  The present invention is also a wireless communication method in a wireless device including a reception unit that receives a wireless signal at a switchable reception frequency and an oscillator that oscillates at a variable oscillation frequency, and (a) the reception unit receives the signal. Detecting a jamming wave that lowers the reception sensitivity of the radio device to a predetermined level or more by interfering with the radio signal, and (b) based on the detection result of the jamming wave, the oscillation frequency of the oscillator And a step of controlling.

  According to the wireless device of the present invention, the reception unit that receives a wireless signal at a switchable reception frequency and the wireless signal received by the receiving unit interfere with the reception sensitivity of the wireless device more than a predetermined value. An interference wave detection unit that detects an interference wave to be generated, an oscillator that oscillates at a variable oscillation frequency, and a control unit that controls the oscillation frequency of the oscillator based on a detection result in the interference wave detection unit. As a result, it is possible to suppress a decrease in reception sensitivity of the wireless device regardless of the aging deterioration of the oscillator, the individual frequency difference of the interference wave, or the like.

  In addition, according to the present invention, there is provided a wireless communication method in a wireless device including a reception unit that receives a wireless signal at a switchable reception frequency and an oscillator that oscillates at a variable oscillation frequency, and (a) the reception unit Detecting a jamming wave that lowers the reception sensitivity of the radio device to a predetermined level or more by interfering with the radio signal received in step (b), and (b) based on the detection result of the jamming wave, the oscillation of the oscillator Including the step of controlling the frequency, it is possible to suppress a decrease in the reception sensitivity of the wireless device regardless of the deterioration of the oscillator over time, the individual frequency difference of the interference wave, or the like.

1 is a configuration diagram of a wireless device according to a first exemplary embodiment; 3 is a flowchart of a wireless communication method of the wireless device according to the first exemplary embodiment; FIG. 3 is a configuration diagram of a wireless device according to a second exemplary embodiment; 6 is a flowchart of a wireless communication method of the wireless device according to the second exemplary embodiment; It is a block diagram of the radio | wireless apparatus of background art.

  FIG. 5 is a configuration diagram of a wireless device described in Patent Document 1 which is the background of the present invention. As shown in FIG. 5, the wireless device of the background art includes a receiving unit 202 that receives a wireless signal, a transmitting unit 201 that transmits a wireless signal, an oscillator 203 that oscillates a wireless signal, a reception frequency of the receiving unit 202, and an oscillator The control unit 204 controls the oscillation frequency 203 and the transmission frequency of the transmission unit 201 using the frequency control signals 211 and 212 and the oscillation frequency control signal 213.

  Since the radio signal oscillated by the oscillator 203 interferes with the reception signal received by the reception unit 202 and becomes an interference wave that is a signal that lowers the reception sensitivity of the wireless device to a predetermined level or more, the control unit 204 Control is performed so that a plurality of oscillation frequencies can be selected by the output oscillation frequency control signal 213. This control is interlocked with the switching of the reception frequency by the frequency control signal 212, and an oscillation frequency that does not cause an interference wave with respect to the switched reception frequency is selected.

  Note that the switching value of the oscillation frequency of the oscillator 203 that is linked to the switching of the reception frequency by the frequency control signal 212 is determined in advance at the design stage of the wireless device.

  In the conventional radio apparatus as described above, the frequency of the interference wave that varies depending on the structure in the casing of the radio apparatus can be specified theoretically or experimentally at the design stage. However, in reality, it is difficult to prevent such interfering waves permanently for all individuals for a long time due to the deterioration of the oscillator 203 over time, the displacement of the structure in the housing for each individual, or the like.

<A. Embodiment 1>
A wireless device according to the present invention that solves the above problems will be described below.

<A-1. Configuration>
Embodiment 1 of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a radio apparatus according to Embodiment 1 of the present invention. The wireless device is a wireless unit 20, a wireless control unit 10 that controls the wireless unit 20, an interference wave detection unit 30 that is disposed adjacent to the wireless unit 20, and a control unit that operates on the wireless control unit 10. A clock control unit 40.

  The radio control unit 10 outputs a CPU 11 that operates with a high-frequency clock 51, an oscillator 12 that outputs the high-frequency clock 51 and drives the CPU 11, a DSP (Digital Signal Processor) 13 that operates with a high-frequency clock 52, and a high-frequency clock 52. An oscillator 14 that drives the DSP 13, an FPGA (Field Programmable Gate Array) 15 that operates with a high-frequency clock 53, and an oscillator 16 that outputs the high-frequency clock 53 and drives the FPGA 15 are provided. The oscillators 12, 14, and 16 oscillate at a variable oscillation frequency.

  The radio unit 20 includes a reception unit 21 that receives a radio signal at a switchable reception frequency, and a transmission unit 22 that transmits the radio signal. Further, in order to detect the presence / absence of an interfering wave that causes a deterioration in reception sensitivity in the housing of the receiving unit 21, an interfering wave detecting unit 30 is provided at a position physically adjacent to the receiving unit 21. The interference wave detection unit 30 detects a signal having a frequency that becomes an interference wave with respect to the reception frequency, based on the reception frequency information 58 that is information on the reception frequency received from the wireless control unit 10.

  The clock control unit 40 outputs frequency control signals 55, 56, 57 for controlling the oscillation frequencies of the oscillators 12, 14, 16 based on the interference wave information 59 output from the interference wave detection unit 30, and presently And the setting information of the oscillation frequencies of the oscillators 12, 14, and 16 are stored in a nonvolatile memory.

<A-2. Operation>
Next, an operation flow of the radio apparatus according to the first embodiment will be described with reference to FIGS. 1 and 2. First, a channel to be used, that is, a reception frequency is determined in a wireless device that switches between a plurality of reception channels (step S101 in FIG. 2).

  When the reception frequency is determined by switching the reception channel, the radio control unit 10 in FIG. 1 notifies the interference wave detection unit 30 of the reception frequency information 58 (step S103), and the interference wave detection unit 30 detects the reception frequency. A frequency that becomes an interference wave is identified, and a radio signal corresponding to the frequency is detected by actual measurement (step S104). Here, the frequency that becomes an interference wave with respect to the reception frequency is assumed to be the same frequency component as the reception frequency, for example, and a wave including the component is detected. When the frequency component that becomes the interference wave is detected at a predetermined level or more, it is determined that the interference wave is present.

  When the interference wave detection unit 30 determines that there is an interference wave, it notifies the clock control unit 40 of the reception frequency and the interference wave information 59 that is information related to the interference wave. The oscillation frequencies of the oscillators 12, 14, and 16 are changed using 55, 56, and 57 (step S105). This operation is repeated until no jamming wave is detected by the jamming wave detection unit 30, and it is confirmed that the radio signal actually measured by the jamming wave detection unit 30 does not become a jamming wave.

  When the interference wave detection unit 30 determines that there is no interference wave, the interference wave information 59 (information about reception frequency and no interference wave) is notified to the clock control unit 40, and the clock control unit 40 receives the reception frequency. And the setting information of the oscillation frequency of the current oscillators 12, 14, 16 is stored in the nonvolatile memory (step S106), and is used for the oscillation frequency setting from the next time. When the oscillators 12, 14, and 16 are not yet oscillating signals, a predetermined frequency (that is, a frequency that is not the same as the reception frequency) avoiding a frequency that becomes an interference wave with respect to the received radio signal is controlled. The signals 55, 56, 57 are used to set the oscillators 12, 14, 16.

<A-3. Effect>
According to the first embodiment of the present invention, in the wireless device, the reception unit 21 that receives the wireless signal at the switchable reception frequency, and the reception of the wireless device by interfering with the wireless signal received by the reception unit 21. Based on the detection result in the interference wave detection unit 30, the interference wave detection unit 30 that detects the interference wave that lowers the sensitivity beyond a predetermined level, the oscillators 12, 14, and 16 that oscillate at a variable oscillation frequency, By including a clock control unit 40 that is a control unit for controlling the oscillation frequencies of 14 and 16, the reception sensitivity of the wireless device can be improved regardless of aging deterioration of the oscillators 12, 14 and 16, frequency individual differences of interference waves, and the like. The decrease can be suppressed.

  Further, according to the first embodiment of the present invention, in the radio apparatus, the jamming wave includes the same frequency component as the radio signal received by the receiving unit 21, and the jamming wave detecting unit 30 sets the frequency component to a predetermined value. When it is recognized that there is an interference wave when it is detected above the level, it is recognized from actual measurement that the reception sensitivity is lowered, and the oscillation frequency of the oscillators 12, 14, 16 is changed to suppress the reduction of the reception sensitivity. be able to.

  Further, according to the first embodiment of the present invention, in the wireless device, the interference wave detection unit 30 is arranged at a position adjacent to the reception unit 21 so that interference at a place where interference with the reception signal occurs. Wave detection can be performed accurately.

  Further, according to the first embodiment of the present invention, in the radio apparatus, when the interference wave is detected by the interference wave detection unit 30, the clock control unit 40 that is a control unit does not detect the interference wave. If the oscillation frequency in the oscillator 12, 14, 16 is changed and no interference wave is detected in the interference wave detection unit 30, the interference wave is detected by not changing the oscillation frequency in the oscillator 12, 14, 16 It is possible to effectively suppress a decrease in reception sensitivity when it is performed.

  Further, according to the first embodiment of the present invention, in the wireless device, when the reception frequency in the reception unit 21 is changed, the interference wave detection unit 30 changes the reception frequency by detecting the interference wave. In each case, it is possible to prevent the generation of an interference wave and suppress a decrease in reception sensitivity.

  In addition, according to the first embodiment of the present invention, the wireless device includes a receiving unit 21 that receives a radio signal at a switchable receiving frequency and oscillators 12, 14, and 16 that oscillate at a variable oscillation frequency. (A) a step of detecting an interference wave that lowers the reception sensitivity of the wireless device to a predetermined level or more by interfering with a radio signal received by the reception unit 21; and (b) a detection result of the interference wave. And a step of controlling the oscillation frequency of the oscillators 12, 14, and 16 to suppress a decrease in reception sensitivity of the wireless device regardless of the deterioration of the oscillator over time, the individual frequency difference of the interference wave, or the like. Is possible.

  Also, according to the first embodiment of the present invention, in the wireless communication method, when the step (a) includes the same frequency as the wireless signal received by the receiving unit 21 and a frequency component is detected at a predetermined level or higher. In the case where it is recognized that the reception sensitivity is lowered due to the actual measurement, it is possible to change the oscillation frequency of the oscillators 12, 14, and 16 to suppress the decrease in the reception sensitivity. it can.

  In addition, according to the first embodiment of the present invention, in the wireless communication method, the step (a) is a step of detecting an interference wave at a position adjacent to the receiving unit 21, thereby interfering with the received signal. It is possible to accurately detect the interference wave in a place where the occurrence of the interference occurs.

  In addition, according to the first embodiment of the present invention, in the wireless communication method, the step (b) includes the oscillator 12, so that the interference wave is not detected when the interference wave is detected in the step (a). When the oscillation frequency in 14 and 16 is changed and no interference wave is detected in the step (a), the interference wave is detected in the process of not changing the oscillation frequency in the oscillators 12, 14 and 16. It is possible to effectively suppress a decrease in reception sensitivity.

  In addition, according to the first embodiment of the present invention, in the wireless communication method, the step (a) is a step of detecting an interference wave when the reception frequency in the reception unit 21 is changed. Each time the frequency is changed, it is possible to prevent the generation of an interference wave and suppress a decrease in reception sensitivity.

<B. Second Embodiment>
<B-1. Configuration>
The second embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a configuration diagram of a radio apparatus according to Embodiment 2 of the present invention. Compared with the radio apparatus shown in the first embodiment, the frequency control signal 54 output from the radio control unit 10 to the radio unit 20, and the interference wave information 60 output from the interference wave detection unit 30 to the radio control unit 10; Has been added. Since other configurations are the same as those shown in the first embodiment, detailed description thereof is omitted.

<B-2. Operation>
Next, the operation flow of the radio apparatus according to the second embodiment will be described with reference to FIGS. First, a channel to be used, that is, a reception frequency is determined in a wireless device that switches between a plurality of reception channels (step S101 in FIG. 4).

  When the reception frequency is determined, the wireless control unit 10 in FIG. 3 turns off the reception unit 21 using the frequency control signal 54 (step S102). This is to eliminate the influence of the reception signal of the reception unit 21 and to detect the interference wave more accurately.

  Further, the radio control unit 10 notifies the interference wave detection unit 30 of the reception frequency information 58 (step S103), and the interference wave detection unit 30 identifies a frequency corresponding to the reception frequency, and the radio corresponding to the frequency. The signal is detected by actual measurement (step S104). Here, the frequency that becomes an interference wave with respect to the reception frequency is assumed to be the same frequency component as the reception frequency, for example, and a wave including the component is detected. When the frequency component that becomes the interference wave is detected at a predetermined level or more, it is determined that the interference wave is present.

  When the interference wave detection unit 30 determines that there is an interference wave, the reception frequency and the interference wave information 59 are notified to the clock control unit 40, and the clock control unit 40 sends frequency control signals 55, 56, 57. By using this, the oscillation frequency of the oscillators 12, 14, and 16 is changed (step S105). This operation is repeated until no jamming wave is detected by the jamming wave detection unit 30, and it is confirmed that the radio signal actually measured by the jamming wave detection unit 30 does not become a jamming wave.

  When the interference wave detection unit 30 determines that there is no interference wave, the interference wave information 59 (information about reception frequency and no interference wave) is notified to the clock control unit 40, and the clock control unit 40 receives the reception frequency. And the setting information of the oscillation frequency of the current oscillators 12, 14, 16 is stored in the nonvolatile memory (step S106), and is used for the oscillation frequency setting from the next time. When the oscillators 12, 14, and 16 are not yet oscillating signals, a predetermined frequency (that is, a frequency that is not the same as the reception frequency) avoiding a frequency that becomes an interference wave with respect to the received radio signal is controlled. The signals 55, 56, 57 are used to set the oscillators 12, 14, 16.

  At the same time, the radio control unit 10 that notifies the radio control unit 10 of the jamming wave information 60 (information about the reception frequency and no jamming wave) uses the frequency control signal 54 to receive the radio wave control unit 10. 21 is turned on (step S107), and the reception operation is started.

<B-3. Effect>
According to the second embodiment of the present invention, in the wireless device, the reception unit 21 stops operating when the interference wave detection unit 30 detects the interference wave, and the interference wave detection unit 30 detects the interference wave. If not, the operation is started, so that the interference wave can be detected more accurately without being affected by the received signal.

  Further, according to the second embodiment of the present invention, in the wireless communication method, (c) (a) the reception sensitivity of the wireless device is reduced to a predetermined level or more by interfering with the wireless signal received by the receiving unit 21. A step of stopping the operation of the reception unit 21 before the step of detecting the interference wave, and a step of starting the operation of the reception unit 21 when the interference wave is not detected after the step (a). Furthermore, the interference wave can be detected more accurately without being affected by the received signal.

  10 radio control unit, 12, 14, 16, 203 oscillator, 20 radio unit, 21,202 reception unit, 22, 201 transmission unit, 30 jamming wave detection unit, 40 clock control unit, 51, 52, 53 high frequency clock, 54 , 55, 56, 57, 211, 212 Frequency control signal, 58 reception frequency information, 59, 60 jamming wave information, 204 control unit, 213 oscillation frequency control signal.

Claims (12)

A receiver for receiving a radio signal at a switchable reception frequency;
An interference wave detection unit that detects an interference wave that lowers the reception sensitivity of the wireless device to a predetermined level or more by interfering with the wireless signal received by the reception unit;
An oscillator that oscillates at a variable oscillation frequency;
A control unit that controls the oscillation frequency of the oscillator based on a detection result in the interference wave detection unit;
Wireless device. The jamming wave includes the same frequency component as the radio signal received by the receiving unit,
The interference wave detection unit determines that there is an interference wave when the frequency component is detected at a predetermined level or higher,
The wireless device according to claim 1. The interference wave detection unit is disposed at a position adjacent to the reception unit,
The wireless device according to claim 1 or 2. The control unit changes the oscillation frequency of the oscillator so that the interference wave is not detected when the interference wave is detected by the interference wave detection unit, and the interference wave is detected by the interference wave detection unit. If not detected, do not change the oscillation frequency in the oscillator,
The radio | wireless apparatus in any one of Claims 1-3. The interference wave detection unit detects the interference wave when the reception frequency in the reception unit is changed.
The wireless device according to claim 1. The receiving unit stops the operation when detecting the jamming wave in the jamming wave detection unit, and starts the operation when the jamming wave is not detected in the jamming wave detection unit,
The wireless device according to claim 1. A wireless communication method in a wireless device comprising a receiver that receives a wireless signal at a switchable reception frequency, and an oscillator that oscillates at a variable oscillation frequency,
(A) detecting an interference wave that lowers the reception sensitivity of the wireless device to a predetermined level or more by interfering with the wireless signal received by the receiving unit;
(B) controlling the oscillation frequency of the oscillator based on the detection result of the interference wave,
Wireless communication method. The step (a) includes the same frequency as the radio signal received by the receiving unit, and is a step of determining that there is an interference wave when the frequency component is detected at a predetermined level or higher.
The wireless communication method according to claim 7. The step (a) is a step of detecting the interference wave at a position adjacent to the receiving unit.
The wireless communication method according to claim 7 or 8. In the step (b), when the interference wave is detected in the step (a), the oscillation frequency in the oscillator is changed so that the interference wave is not detected, and the interference in the step (a). If no wave is detected, it is a step of not changing the oscillation frequency in the oscillator.
The wireless communication method according to claim 7. The step (a) is a step of detecting the jamming wave when the reception frequency in the receiving unit is changed.
The wireless communication method according to claim 7. (C) before the step (a), stopping the operation of the receiving unit;
(D) after the step (a), further comprising a step of starting the operation of the receiving unit when the interference wave is not detected,
The wireless communication method according to claim 7.

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