JP5074321B2 - Wireless communication device - Google Patents

Description

  The present invention relates to a wireless communication apparatus.

The cognitive radio technology is a technology for recognizing the usage status of a plurality of radio systems having different characteristics and improving the frequency utilization efficiency by adaptively using the plurality of radio systems. However, when two channels of the same wireless system are used at the same time, the frequency band is close and a large interference power is generated between them. In particular, leaked radio waves in which the transmission signal of the terminal arrives at the other receiver through the terminal or via the antenna becomes very large interference power. Therefore, there is known a technique for reducing the influence of interference by receiving and demodulating a signal of an adjacent channel serving as interference power, creating a replica at that frequency, and removing the created replica from the received signal (for example, , See Patent Document 1).
JP 2000-151530 A

  However, in the technique of Patent Document 1, in order to receive and demodulate a signal of an adjacent channel serving as interference power, it is necessary to adjust a filter to the frequency of the signal of the adjacent channel. Therefore, there is a problem that the influence of interference cannot be reduced when the frequency band of the adjacent channel serving as interference power is far from the band that can be demodulated.

  The present invention has been made to solve the above-described problem, and a wireless communication apparatus capable of reducing the influence of interference even when the frequency band of an adjacent channel serving as interference power is away from a band that can be demodulated. The purpose is to provide.

The present invention includes an antenna, a transmission system that transmits radio signals in the first frequency band, including a modulation unit that modulates transmission data and outputs radio signals in the first frequency band, and the modulation unit outputs An adjustment unit that adjusts the amplitude and phase of the radio signal, a synthesis unit that synthesizes the radio signal received by the antenna and the radio signal adjusted by the adjustment unit, and a demodulation that demodulates the radio signal synthesized by the synthesis unit And a receiving system for receiving a radio signal in a second frequency band, including the unit, and the adjustment unit is configured so that the demodulation unit cannot demodulate the radio signal synthesized by the synthesis unit during calibration. An amount of adjusting the amplitude and phase of the radio signal in the first frequency band output from the modulation unit is determined, and the phase and amplitude of the radio signal demodulated by the demodulation unit are determined in the first frequency band. For the phase and amplitude of the modulation signal A conversion unit that converts the amplitude and phase of the radio signal in the first frequency band output from the modulation unit based on the phase and the amplitude converted by the conversion unit. The wireless communication apparatus is characterized in that an amount to be determined is determined .

  According to the present invention, it is possible to reduce the influence of interference even when the frequency band of an adjacent channel serving as interference power is away from a band that can be demodulated.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration of a wireless communication apparatus according to the present embodiment. The wireless communication apparatus includes a transmission system 11 that transmits a radio signal in the first frequency band, a reception system 12 that receives a radio signal in the second frequency band, an amplitude / phase adjuster 13 (adjustment unit), and a synthesis A unit 14 and antennas 15 and 16 are provided. The first frequency band is channel 1 (Ch1), and the second frequency band is channel 5 (CH5).

  The transmission system 11 includes a modulator 111 (modulation unit) and a power amplifier (PA) 112. The reception system 12 includes a low noise amplifier (LNA, Low Noise Amplifier) 121 and a demodulator 122 (demodulation unit). For ease of explanation, it is assumed that the wireless communication apparatus according to the present embodiment includes two transmission / reception systems including a transmission system 11 having a transmission function and a reception system 12 having a reception function as transmission / reception systems. . In general, the transmission system 11 also has a reception function, and the reception system 12 also has a transmission function.

  The amplitude / phase adjuster 13 adjusts the amplitude and phase of the radio signal. The combining unit 14 combines the wireless signals. The antennas 15 and 16 transmit and receive radio signals. The modulator 111 modulates transmission data into a radio signal. The power amplifier 112 amplifies the power of the radio signal to the power level transmitted from the antenna 15. The low noise amplifier 121 amplifies the radio signal received by the antenna 16. The demodulator 122 demodulates the radio signal amplified by the low noise amplifier 121 into data.

  In the present embodiment, the amplitude / phase adjuster 13 receives the input of the radio signal amplified by the power amplifier 112 and adjusts the amplitude and phase of the radio signal, but the radio signal output by the modulator 111 May be received and the amplitude and phase of the radio signal may be adjusted.

  When there are a plurality of radio systems and a plurality of antennas that perform radio communication using different frequency bands as in the present embodiment, the signal amplified by the power amplifier 112 of the transmission system 11 is propagated on a substrate or the like. The signal and the signal transmitted from the antenna 15 and received by the antenna 16 are interference sources in the demodulator 25 of the reception system 12. A signal that becomes an interference source is called a leaked radio wave.

  For example, when the transmission system 11 transmits a radio signal on CH1 as the first frequency band and the reception system 12 receives this radio signal on CH5, the interference is attenuated by the transmission / reception filter. However, even though it is attenuated by several tens of dB compared to the case where it is received by connecting a direct cable, there is a case where the reception power of this interference signal is higher than the signal received from the wireless communication device of the communication partner. There is a possibility of significant interference. As a method of reducing this interference, there is a method of generating a replica. However, it is not possible to cope with a case where the band of the interference source is more than the band that can be demodulated.

  Therefore, as shown in FIG. 1, the wireless communication apparatus transmits an amplitude / phase adjuster 13 that adjusts the phase and amplitude of a signal input from the transmission system 11, a signal adjusted by the amplitude / phase adjuster 13, and leaked radio waves. The composition unit 14 is configured to be composed. At the time of calibration, the transmission system 11 transmits a signal for interference measurement by a spread spectrum (DSSS, Direct Sequence Spread-Spectrum) method, and the amplitude / phase adjuster 13 is set so that the signal level in the reception system 12 is lowered. Adjust the phase and amplitude of the signal. Since the signal received by the receiving system 12 at the time of calibration is an interference signal, the interference can be reduced by lowering the signal level of the received signal.

  As a result, the amplitude / phase adjuster 13 can obtain an adjustment value for reducing interference. When the wireless communication device communicates with another wireless communication device, the amplitude / phase adjuster 13 adjusts the phase and amplitude of the signal input from the transmission system 11 using the adjustment value acquired at the time of calibration. The combining unit 14 combines the signal adjusted by the phase adjuster 13 and the leaked radio wave, so that interference that the transmission system 11 has on the reception system 12 can be reduced.

  Hereinafter, a specific processing procedure of the interference removal method that the transmission system 11 has on the reception system 12 in this embodiment will be described. First, processing in the transmission system 11 will be described. Modulator 111 changes data to be transmitted (transmission data) to a signal of CH1 (first frequency band). Subsequently, the power amplifier 112 amplifies the signal modulated by the modulator to the power level transmitted from the antenna 15. Subsequently, the antenna 15 outputs the signal amplified by the power amplifier 112. At this time, the antenna 16 receives the signal output from the antenna 15. The signal amplified by the power amplifier 112 is received by the receiving system 12 through a substrate in the wireless communication apparatus. These interference signals (leakage radio waves) are amplified by the low noise amplifier 121 and then transmitted to the demodulator 122, causing interference during demodulation.

  Next, processing in the receiving system 12 will be described. The demodulator 122 of the reception system 12 demodulates the signal amplified by the low noise amplifier 121. If the interference signal is transmitted in a spread spectrum manner and has sufficient power, the demodulator 122 can demodulate the interference signal. That is, when the demodulator 122 can demodulate the interference signal, interference power has arrived at the reception system 12. In order to remove this interference power, the wireless communication apparatus of this embodiment includes an amplitude / phase adjuster 13 and a combining unit 14.

  In a state where only the transmission system 11 transmits a signal and no signal is transmitted from another wireless communication device, such as during calibration, the reception system 12 receives only interference power (leakage radio waves). At the time of calibration, the amplitude / phase adjuster 13 adjusts the amplitude and phase of the signal output from the power amplifier 112 so that the signal has an opposite phase to the signal received by the receiving system 12. The synthesizer 14 synthesizes the signal adjusted by the amplitude / phase adjuster 13 and the signal received by the antenna 15. The low noise amplifier 121 amplifies the synthesized signal, and the demodulator 122 demodulates the amplified signal. However, if the demodulator 122 cannot demodulate, the interference power is removed.

  Specifically, the amplitude / phase adjuster 13 adjusts the amplitude and phase of the signal output from the power amplifier 112 so that the demodulator 122 cannot demodulate the signal amplified by the low noise amplifier 121. When the demodulator 122 cannot perform demodulation, the amplitude and phase adjustment values adjusted by the amplitude / phase adjuster 13 at that time are stored in the storage unit.

  As described above, the amplitude / phase adjuster 13 can obtain an optimum adjustment value for reducing interference. Thereby, when the wireless communication device communicates with another wireless communication device, the amplitude / phase adjuster 13 adjusts the phase and amplitude of the signal input from the transmission system 11 using the adjustment value acquired at the time of calibration. The combining unit 14 combines the signal adjusted by the amplitude / phase adjuster 13 and the leaked radio wave, so that the interference that the transmission system 11 has on the reception system 12 can be reduced. Further, by appropriately performing calibration, it is possible to cope with changes in the phase and amplitude of leaked radio waves due to the reflection state of radio waves around the radio communication apparatus and when a person has the radio communication apparatus.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described. In this embodiment, the transmission system and the reception system share an antenna. FIG. 2 is a diagram illustrating a configuration of the wireless communication apparatus according to the present embodiment. The wireless communication apparatus includes a transmission system 11 that transmits a radio signal in the first frequency band, a reception system 12 that receives a radio signal in the second frequency band, an amplitude / phase adjuster 13 (adjustment unit), and a synthesis A unit 14, an antenna 17, and a distributor / synthesizer 18 are provided.

  The transmission system 11 includes a modulator 111 and a power amplifier 112. The reception system 12 includes a low noise amplifier 121 and a demodulator 122. For ease of explanation, it is assumed that the wireless communication apparatus according to the present embodiment includes two transmission / reception systems including a transmission system 11 having a transmission function and a reception system 12 having a reception function as transmission / reception systems. . In general, the transmission system 11 also has a reception function, and the reception system 12 also has a transmission function.

  The antenna 17 is shared by the transmission system 11 and the reception system 12. The distributor / combiner 18 distributes and combines signals transmitted and received between the transmission system 11 and the reception system 12. The other parts are the same as those in the first embodiment.

  In the present embodiment, the amplitude / phase adjuster 13 receives the input of the radio signal amplified by the power amplifier 112 and adjusts the amplitude and phase of the radio signal, but the radio signal output by the modulator 111 May be received and the amplitude and phase of the radio signal may be adjusted.

  The transmission system 11 and the reception system 12 share an antenna 17 and a distributor / combiner 18. Therefore, the reception system 12 receives a signal transmitted from the transmission system 11 via the antenna 17 and the distributor / combiner 18. Further, the signal amplified by the power amplifier 112 provided in the transmission system 11 is transmitted through the substrate in the wireless communication apparatus and received by the reception system 12. These signals (leakage radio waves) are amplified by the low noise amplifier 121 and then transmitted to the demodulator 122 to cause interference.

  In a state where only the transmission system 11 transmits a signal and no signal is transmitted from another wireless communication device, such as during calibration, the reception system 12 receives only interference power (leakage radio waves). At the time of calibration, the amplitude / phase adjuster 13 adjusts the amplitude and phase of the signal output from the power amplifier 112 so that the signal has an opposite phase to the signal received by the receiving system 12. The synthesizer 14 synthesizes the signal adjusted by the amplitude / phase adjuster 13 and the signal received by the receiving system 12 via the antenna 17 and the distributor / synthesizer 18. The low noise amplifier 121 amplifies the synthesized signal, and the demodulator 122 demodulates the amplified signal. However, if the demodulator 122 cannot demodulate, the interference power is removed.

  Specifically, the amplitude / phase adjuster 13 adjusts the amplitude and phase of the signal output from the power amplifier 112 so that the demodulator 122 cannot demodulate the signal amplified by the low noise amplifier 121. When the demodulator 122 cannot perform demodulation, the amplitude and phase adjustment values adjusted by the amplitude / phase adjuster 13 at that time are stored in the storage unit.

  As described above, the amplitude / phase adjuster 13 can obtain an optimum adjustment value for reducing interference. Thereby, when the wireless communication device communicates with another wireless communication device, the amplitude / phase adjuster 13 adjusts the phase and amplitude of the signal input from the transmission system 11 using the adjustment value acquired at the time of calibration. The combining unit 14 combines the signal adjusted by the amplitude / phase adjuster 13 and the leaked radio wave, so that the interference that the transmission system 11 has on the reception system 12 can be reduced.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the first embodiment and the second embodiment, a signal transmitted in a frequency band different from the frequency band used by the own receiving system is demodulated, and the amplitude / phase adjuster determines the amplitude and the amplitude based on the demodulated signal. The value for adjusting the phase was determined. However, the phase and amplitude of a signal demodulated in a frequency band different from the transmitted frequency band may be different from the phase and amplitude of a signal demodulated at the same frequency as the transmitted frequency. For example, the phase / amplitude obtained when the leaked radio wave of channel 1 is demodulated by channel 1 is different from the phase / amplitude obtained when the leaked radio wave of channel 1 is demodulated by channel 5.

  In this embodiment, in order to eliminate the phase / amplitude difference due to the demodulated channel, the phase / amplitude obtained by demodulating with a channel different from the transmitted channel is demodulated with the same channel as the transmitted channel. An amplitude / phase converter 20 for converting into the obtained phase / amplitude is provided.

  FIG. 3 is a diagram showing the configuration of the wireless communication apparatus according to this embodiment. The wireless communication apparatus includes a transmission system 11 that transmits a radio signal in the first frequency band, a reception system 12 that receives a radio signal in the second frequency band, an amplitude / phase adjuster 13, a combining unit 14, Antennas 15 and 16 and an amplitude / transfer converter 20 (converter) are provided.

  The transmission system 11 includes a modulator 111 and a power amplifier 112. The reception system 12 includes a low noise amplifier 121 and a demodulator 122. For ease of explanation, it is assumed that the wireless communication apparatus according to the present embodiment includes two transmission / reception systems including a transmission system 11 having a transmission function and a reception system 12 having a reception function as transmission / reception systems. . In general, the transmission system 11 also has a reception function, and the reception system 12 also has a transmission function. Each part other than the amplitude / phase converter 20 is the same as each part of the first embodiment.

  In the present embodiment, the amplitude / phase adjuster 13 receives the input of the radio signal amplified by the power amplifier 112 and adjusts the amplitude and phase of the radio signal, but the radio signal output by the modulator 111 May be received and the amplitude and phase of the radio signal may be adjusted.

  The amplitude / phase converter 20 converts the phase / amplitude obtained by demodulating the channel different from the transmitted channel into the phase / amplitude obtained by demodulating the same channel as the transmitted channel. For example, the relationship between the phase / amplitude obtained when the signal transmitted on channel 1 is demodulated on channel 1 and the phase / amplitude obtained when the signal transmitted on channel 1 is demodulated on channel 5 is uniquely determined. A function to be determined is determined in advance. The amplitude / phase conversion unit 20 uses this function to obtain the phase / amplitude obtained when the signal transmitted through the channel 1 is demodulated through the channel 5, and when the signal transmitted through the channel 1 is demodulated through the channel 1. Convert to the obtained phase and amplitude.

  Instead of the function, the phase / amplitude obtained when the signal transmitted through channel 1 is demodulated by channel 1 and the phase / amplitude obtained when the signal transmitted through channel 1 is demodulated by channel 5 These relationships may be tabulated and stored in the storage unit, and conversion may be performed using this table.

  Next, a method for removing interference in the self-radio communication apparatus in the present embodiment will be described. The processing in the transmission system 11 in the present embodiment is the same as the processing in the transmission system 11 in the first embodiment. Further, the processing in the reception system 12 in the present embodiment is the same as the processing in the reception system 12 in the first embodiment.

  Next, a method for adjusting the amplitude and phase of the amplitude / phase adjuster 13 in this embodiment will be described. In the first embodiment, adjustment is performed based on the amplitude and phase demodulated by the demodulator 122, that is, the amplitude and phase obtained by demodulating the signal transmitted through the channel 1 using the channel 5. In the present embodiment, the amplitude / phase adjuster 13 adjusts the amplitude / phase based on the amplitude and phase obtained when demodulating in the channel 1 obtained by the amplitude / phase converter 20. The adjustment method is the same as in the first embodiment. Thereby, the amplitude / phase adjuster 13 can obtain a more accurate amplitude / phase adjustment value.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. In the present embodiment, unlike the first embodiment, the signal synthesized by the synthesis unit is demodulated using a demodulator provided in a transmission / reception system that transmits a radio signal.

  FIG. 4 is a diagram showing the configuration of the wireless communication apparatus according to this embodiment. The wireless communication apparatus includes a first transmission / reception system 31 that transmits / receives a radio signal in the first frequency band, a second transmission / reception system 32 that transmits / receives a radio signal in the second frequency band, and an amplitude / phase adjuster 33 ( Adjustment unit), combining unit 34, antennas 35 and 36, and switch unit 37.

  The first transmission / reception system 31 includes a modulator 311 (first modulation unit), a power amplifier 312, a low noise amplifier 313, and a demodulator 314 (first demodulation unit). The second transmission / reception system 32 includes a modulator 315 (second modulation unit), a power amplifier 316, a low noise amplifier 317, and a demodulator 318 (second demodulation unit).

  The amplitude / phase adjuster 33 adjusts the amplitude and phase of the radio signal. The combining unit 34 combines the wireless signals. The antennas 35 and 36 transmit and receive radio signals. Modulators 311 and 315 modulate transmission data into radio signals. The power amplifiers 312 and 316 amplify the power of the radio signal to the power level transmitted from the antennas 35 and 36. The low noise amplifiers 313 and 317 amplify the radio signals received by the antennas 35 and 36. Demodulators 314 and 318 demodulate the radio signals amplified by low noise amplifiers 313 and 317 into data.

  In the present embodiment, the amplitude / phase adjuster 33 receives the input of the radio signal amplified by the power amplifier 312 and adjusts the amplitude and phase of the radio signal, but the radio signal output by the modulator 311 May be received and the amplitude and phase of the radio signal may be adjusted.

  Similarly to the first embodiment, in this embodiment, there are a plurality of transmission / reception systems and a plurality of antennas that perform wireless communication using different frequency bands, so that signals transmitted by other transmission / reception systems become interference sources. . Specifically, among the signals amplified by the power amplifier 312 of the first transmission / reception system 31, the signal that propagates through the substrate and the signal that is transmitted from the antenna 35 and received by the antenna 36 are the second transmission / reception system. The 32 demodulator 318 is an interference source.

  For example, when the first transmission / reception system 31 transmits a radio signal on CH1 as the first frequency band and the second transmission / reception system 32 receives this radio signal on CH5, the interference is attenuated by the transmission / reception filter. However, even though it is attenuated by several tens of dB compared to the case where it is received by connecting a direct cable, there is a case where the reception power of this interference signal is higher than the signal received from the wireless communication device of the communication partner. There is a possibility of significant interference. Therefore, also in the present embodiment, as in the first embodiment, the combining unit 34 combines the signal adjusted by the amplitude / phase adjusting unit 33 and the interference signal, so that the first transmission / reception system 31 becomes the second transmission / reception system 31. Interference on the transmission / reception system 32 is reduced.

  Hereinafter, a specific processing procedure of a method for removing interference that the first transmission / reception system 31 has on the second transmission / reception system 32 in the present embodiment will be described. First, processing in the first transmission / reception system 31 will be described. Modulator 311 changes data to be transmitted (transmission data) to a signal of CH1 (first frequency band). Subsequently, the power amplifier 312 amplifies the signal modulated by the modulator 311 to the power level transmitted from the antenna 35. Subsequently, the antenna 35 outputs the signal amplified by the power amplifier 312. At this time, the antenna 36 receives the signal output from the antenna 35. In addition, the signal amplified by the power amplifier 312 is received by the second transmission / reception system 32 through the substrate in the wireless communication apparatus. These signals (leakage radio waves) are amplified by the low noise amplifier 317 and then transmitted to the demodulator 318, which causes interference during demodulation.

  Next, processing in the second transmission / reception system 32 will be described. The demodulator 318 of the second transmission / reception system 32 demodulates the received signal. If the interference signal is transmitted in a spread spectrum manner and has sufficient power, demodulator 318 can demodulate the interference signal. That is, when the interference signal can be demodulated, interference power has arrived at the second transmission / reception system 32. In order to remove this interference power, the wireless communication apparatus of this embodiment includes an amplitude / phase adjuster 33 and a combining unit 34.

  In a state where only the first transmission / reception system 31 transmits a signal and no signal is transmitted from another wireless communication device, such as during calibration, the antenna 35 and the second transmission / reception system 32 receive only interference power (leakage radio waves). . At the time of calibration, the amplitude / phase adjuster 33 adjusts the amplitude and phase of the signal output from the power amplifier 312 so that the signal is opposite in phase to the signal received by the second transmission / reception system 32. The synthesizer 34 synthesizes the signal adjusted by the amplitude / phase adjuster 33 and the signal received by the antenna 36. If the demodulator 318 cannot demodulate the synthesized signal, the interference power is removed.

  In the present embodiment, there is a timing at which transmission is performed in the first transmission / reception system 31 but reception is not performed. For example, in the case of TDD (Time Division Duplex), transmission and reception are not performed simultaneously. That is, when the first transmission / reception system 31 is transmitting, the demodulator 314 is not demodulating. Therefore, when the first transmission / reception unit 31 performs transmission, the demodulator 314 can demodulate the signal synthesized by the synthesis unit 34. The amplitude / phase adjuster 33 specifies the adjustment amount of the amplitude and phase based on the value demodulated by the demodulator 314.

  Specifically, the switch unit 37 transmits the signal synthesized by the synthesis unit 34 in a state where only the first transmission / reception system 31 transmits a signal such as during calibration and no signal is transmitted from another wireless communication device. Input to the low noise amplifier 313 of the transmission / reception system 31. At times other than calibration, the switch unit 37 blocks the circuit so that the signal synthesized by the synthesis unit 34 is not input to the low noise amplifier 313 of the first transmission / reception system 31.

  Subsequently, the low noise amplifier 313 amplifies the signal synthesized by the synthesis unit 34. Subsequently, the amplitude / phase adjuster 33 adjusts the amplitude and phase of the signal output from the power amplifier 312 so that the demodulator 314 cannot demodulate the signal amplified by the low noise amplifier 313. When the demodulator 314 is unable to perform demodulation, the amount of adjustment between the amplitude and phase adjusted by the amplitude / phase adjuster 33 at that time is stored in the storage unit.

  As described above, the amplitude / phase adjuster 33 can obtain an optimum adjustment value for reducing interference. Thereby, when the wireless communication device communicates with another wireless communication device, the amplitude and phase adjuster 33 uses the adjustment value acquired at the time of calibration, and the phase and amplitude of the signal input from the first transmission / reception system 31. By combining the signal adjusted by the amplitude / phase adjuster 33 and the leaked radio wave, the combining unit 34 can reduce the interference of the first transmission / reception system 31 on the second transmission / reception system 32.

  In the present embodiment, it is assumed that the radio wave from the power amplifier 312 to the low noise amplifier 313 is devised in advance so as to be removed. This is to remove the influence of the first transmission / reception system 31 when the demodulation unit 314 demodulates the signal synthesized by the synthesis unit 34.

  In this embodiment, the demodulator 314 demodulates the signal synthesized by the synthesis unit 34. The signal (leakage radio wave) synthesized by the synthesizer 34 at the time of calibration is a CH1 signal. The demodulator 314 is a demodulator that demodulates CH1. Accordingly, the demodulator 318 that demodulates the CH5 signal can demodulate more accurately than the method of demodulating the leaked radio wave. Thereby, the adjustment amount of the amplitude / phase adjuster 33 can be determined with higher accuracy.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

  For example, if the delay time between the radio wave propagating through the board, the radio wave propagating between the antennas, and the reflected radio wave around the wireless communication device is large, the signals of opposite phases corresponding to the respective delay times can be synthesized. Interference can be removed with higher accuracy. Specifically, by preparing multiple delay circuits in the amplitude / phase adjuster and generating phase / amplitude signals for each delay time, interference can be performed more accurately even when there is a gap in the delay time. Can be removed.

  Further, although the adjustment amount of the amplitude / phase adjuster is determined using the DSSS packet at the time of calibration, an adjustment signal may be separately transmitted for adjustment. At this time, although it may actually be transmitted from the antenna, there is a possibility of causing interference to other wireless communication devices. Also good. As a result, the adjustment amount of the amplitude / phase adjuster can be determined even when the transmission opportunity of the DSSS packet is small.

It is the figure which showed the structure of the radio | wireless communication apparatus in 1st Embodiment. It is the figure which showed the structure of the radio | wireless communication apparatus in 2nd Embodiment. It is the figure which showed the structure of the radio | wireless communication apparatus in 3rd Embodiment. It is the figure which showed the structure of the radio | wireless communication apparatus in 4th Embodiment.

Explanation of symbols

11, 31 ... Transmission system, 12, 32 ... Reception system, 13, 33 ... Amplitude / phase adjuster, 14, 34 ... Synthesizer, 15, 16, 17, 35, 36 ... Antenna 18 ... Distributor / synthesizer 20 ... Conversion unit 37 ... Switch unit 111, 311, 315 ... Modulator, 112, 312, 316 ... Power amplifier 121 , 313, 317 ... low noise amplifiers, 122, 314, 318 ... demodulator

Claims (1)

An antenna,
A transmission system that transmits a radio signal of the first frequency band, including a modulation unit that modulates transmission data and outputs a radio signal of the first frequency band;
An adjustment unit for adjusting the amplitude and phase of the radio signal output by the modulation unit;
A combining unit that combines the radio signal received by the antenna and the radio signal adjusted by the adjustment unit;
A receiving system for receiving a radio signal in the second frequency band, including a demodulator for demodulating the radio signal synthesized by the synthesizer;
Equipped with a,
The adjustment unit adjusts the amplitude and phase of the radio signal in the first frequency band output from the modulation unit so that the demodulation unit cannot demodulate the radio signal synthesized by the synthesis unit during calibration. Decide
A converter that converts the phase and amplitude of the radio signal demodulated by the demodulator into the phase and amplitude of the modulated signal in the first frequency band.
With
The adjusting unit determines an amount of adjusting the amplitude and phase of the radio signal of the first frequency band output from the modulating unit based on the phase and the amplitude converted by the converting unit. A wireless communication device.

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