JP4391552B2 - Wireless communication device - Google Patents

Description

  The present invention relates to a wireless communication apparatus.

Patent Document 1 discloses an example of a wireless communication device including a transmission circuit and a reception circuit. The transmission / reception circuit described in Patent Document 1 has a function of removing fading that occurs in the forward link of a CDMA radio system using a plurality of antennas.
JP-T-2001-513969

  However, in the case where one apparatus as described above (for example, in the same housing) is provided with a transmission circuit and a reception circuit, the antenna of the transmission circuit and the antenna of the reception circuit are provided at a relatively close distance. For this reason, a relatively strong radio wave may circulate from the antenna of the transmission circuit to the antenna of the reception circuit. When such a radio wave received via the antenna of the receiving circuit is processed by an amplifier (LNA: Low Noise Amplifier) or a mixer of the receiving circuit, the non-linear characteristics of these amplifiers and mixers, etc. A distortion signal is generated, and an even-order distortion signal such as a second order or a fourth order included in the distortion signal is output from the LPF of the receiving circuit. As described above, in the wireless communication device including the transmission circuit and the reception circuit, quality degradation of the reception signal received by the reception circuit is caused.

  SUMMARY OF THE INVENTION An object of the present invention is to improve the quality of a received signal received by a receiving circuit in a wireless communication apparatus including a transmitting circuit and a receiving circuit.

The present invention is a wireless communication apparatus including a transmission circuit that wirelessly transmits a signal that has been spread using a predetermined spreading code, and a reception circuit that wirelessly receives the signal that has been spread. A distortion component compensation circuit that removes a distortion component generated in the reception circuit from a wraparound signal from the transmission circuit to the reception circuit from a reception signal wirelessly received by the reception circuit; The compensation circuit includes an n-th power circuit that generates an n-th power component (n is an even number) of a signal for transmission generated in the transmission circuit, a first adjustment circuit, a second adjustment circuit, and a control circuit. a and a shaping circuit for shaping the n-th power components generated by the n-th power circuit, the n-th power component after the shaping by the shaping circuit have a subtraction circuit for subtracting from the received signal, said first 1 adjustment circuit The amplitude and phase of the power component are adjusted based on preset parameters, and the second adjustment circuit adjusts the amplitude and phase of the adjusted n-th power component output from the first adjustment circuit. An adjustment process and a delay process for delaying and outputting the adjusted n-th power component are performed based on a control signal from the control circuit, and the control circuit uses the spreading code and the subtraction circuit to perform the n process. The control signal is generated based on one of the received signal before subtracting the power component and the signal after the n-th power component is subtracted by the subtracting circuit, and the generated control signal is used as the second control signal. To the adjustment circuit .

According to the present invention, an nth power component (nth-order distortion component) is generated from a signal for transmission that has been spread using a predetermined spreading code that is wirelessly transmitted from the transmission circuit, and this nth power component is used. Distortion components included in the received signal (distortion components due to the wraparound signal from the transmission circuit to the reception circuit) can be removed. Therefore, in a wireless communication apparatus including a transmission circuit and a reception circuit, it is possible to suppress quality deterioration of a reception signal received by the reception circuit. Further, since it is not necessary to arrange the antenna of the transmission circuit and the antenna of the reception circuit so that the signal transmitted from the transmission circuit is not received by the reception circuit, the arrangement of the antenna of the transmission circuit and the antenna of the reception circuit is flexible. Yes. Furthermore, since it is not necessary to provide an amplifier or a mixer that does not generate higher-order distortion components, the cost required for manufacturing the amplifier or the mixer can be suppressed.

  Furthermore, in the present invention, the shaping circuit includes a first adjustment circuit, a second adjustment circuit, and a control circuit, and the first adjustment circuit is configured to perform the n adjustment based on a preset parameter. The amplitude and phase of the power component are adjusted and the adjusted n-th power component is output after being delayed by a predetermined time, and the second adjustment circuit outputs the adjusted n-th power output from the first adjustment circuit. Adjustment processing for adjusting the amplitude and phase of the component is performed based on the control signal from the control circuit, and the control circuit generates the control signal based on the received signal, and the generated control signal is generated by the first control signal. It is preferable to output to the second adjustment circuit.

  Alternatively, in the present invention, the shaping circuit includes a first adjustment circuit, a second adjustment circuit, and a control circuit, and the first adjustment circuit previously calculates the amplitude and phase of the n-th power component. Adjustment is performed based on the set parameters, and the second adjustment circuit adjusts the amplitude and phase of the adjusted n-th power component output from the first adjustment circuit, and the adjusted n Delay processing for delaying and outputting the multiplication component is performed based on the control signal from the control circuit, and the control circuit generates the control signal based on the received signal, and the generated control signal is It is preferable to output to the second adjustment circuit.

  Alternatively, in the present invention, the transmission circuit wirelessly transmits a signal that has been spread using a predetermined spreading code, the reception circuit wirelessly receives the spread-processed signal, and the shaping circuit includes: 1 adjustment circuit, second adjustment circuit, and control circuit, wherein the first adjustment circuit adjusts the amplitude and phase of the n-th power component based on a preset parameter, and The adjustment circuit 2 performs an adjustment process for adjusting the amplitude and phase of the adjusted n-th power component output from the first adjustment circuit, and a delay process for delaying and outputting the adjusted n-th power component. The control circuit generates the control signal based on the spreading code and the received signal, and outputs the generated control signal to the second adjustment circuit. It is preferable to do this.

  Further, in the present invention, the received signal is preferably either a signal input to the subtractor circuit or a signal output from the subtractor circuit. As described above, in the present invention, the feedforward control may be performed using the reception signal input to the subtraction circuit, or the feedback control may be performed using the reception signal output from the subtraction circuit.

  The present invention is also a wireless communication apparatus comprising a transmission circuit that wirelessly transmits a signal that has been spread using a predetermined spreading code, and a reception circuit that wirelessly receives the spread signal. The circuit includes a distortion component compensation circuit that removes a distortion component generated in the reception circuit from a wraparound signal from the transmission circuit to the reception circuit, from a reception signal wirelessly received by the reception circuit, The distortion component compensation circuit extracts an n-th power component (n is an even number) included in the received signal from the received signal using the spreading code, and the n-th power component extracted by the extraction circuit is predetermined. It has a delay circuit that outputs a signal delayed by time, and a subtractor circuit that subtracts the n-th power component output from the delay circuit from the received signal.

  According to the present invention, an nth power component (nth-order distortion component) is generated from a signal for transmission generated in a transmission circuit, and a distortion component (received from the transmission circuit) included in the received signal using the nth power component. The distortion component due to the sneak signal to the circuit) can be removed. Therefore, in a wireless communication apparatus including a transmission circuit and a reception circuit, it is possible to suppress quality deterioration of a reception signal received by the reception circuit. Further, since it is not necessary to arrange the antenna of the transmission circuit and the antenna of the reception circuit so that the signal transmitted from the transmission circuit is not received by the reception circuit, the arrangement of the antenna of the transmission circuit and the antenna of the reception circuit is flexible. Yes. Furthermore, since it is not necessary to provide an amplifier or a mixer that does not generate higher-order distortion components, the cost required for manufacturing the amplifier or the mixer can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, in the radio | wireless communication apparatus provided with the transmission circuit and the receiving circuit, the quality improvement of the received signal received by a receiving circuit is attained.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, if possible, the same elements are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is a diagram illustrating a configuration of a wireless communication apparatus A according to the embodiment. The wireless communication device A includes a transmission circuit A1 that wirelessly transmits a signal and a reception circuit A2 that wirelessly receives the signal. The transmission circuit A1 includes a transmission antenna 1, a transmitter 3, a D / A conversion circuit 5, a waveform shaping filter 7, and an encoder 9. The encoder 9 generates an in-phase signal S1 (I signal) and a quadrature signal S2 (Q signal) of the transmission data from the input transmission data (digital data), and converts these signals into the waveform shaping filter 7. To the D / A conversion circuit 5 and the even-order distortion component compensation circuit 8.

  The D / A conversion circuit 5 converts the in-phase signal S1 and the quadrature signal S2 (digital signal) output from the waveform shaping filter 7 into analog signals, and converts the in-phase signal S1 and the quadrature signal S2 after the conversion. Output to the transmitter 3. The transmitter 3 generates a transmission signal by superimposing the in-phase signal S1 and the quadrature signal S2 (analog signal) output from the D / A conversion circuit 5 on the transmission wave, and transmits the transmission signal to the transmission antenna 1. Via the wireless communication apparatus A.

The reception circuit A2 includes a reception antenna 2, a direct conversion receiver 4, an A / D conversion circuit 6, an even-order distortion component compensation circuit 8, and a discriminator 10. The direct conversion receiver 4 includes an amplifier 4a, a mixer 4b, and an LPF 4c. When a reception signal (a reception signal wirelessly received by the reception circuit A2) is input to the direct conversion receiver 4 via the reception antenna 2, the amplifier 4a of the direct conversion receiver 4 amplifies the reception signal. The mixer 4b generates an in-phase signal S3 and quadrature signal S4 is multiplied by a signal of a predetermined frequency f _r in the received signal amplified by the amplifier 4a, these phase signals S3 and quadrature signal S4, via LPF4c Output to the A / D conversion circuit 6. The LPF 4c outputs a baseband in-phase signal S3 and a quadrature signal S4.

  The reception signals (in-phase signal S3 and quadrature signal S4) output from the mixer 4b include distortion components generated by the amplifier 4a, the mixer 4b, and the like in the direct conversion receiver 4. Of these distortion components, Only the distortion component (even-order distortion component) of the nth order (n is an even number such as 2, 4, 6 and so on) is output to the A / D conversion circuit 6 via the LPF 4c. The nth-order distortion component output from the LPF 4 c includes a distortion component generated in the direct conversion receiver 4 from a reception signal transmitted from the transmission antenna 1 and input to the direct conversion receiver 4 via the reception antenna 2. It is. The A / D conversion circuit 6 converts the in-phase signal S3 and the quadrature signal S4 output from the LPF 4c into digital signals, and converts the digitized in-phase signal S3 and the quadrature signal S4 to an even-order distortion component compensation circuit. 8 is output.

  The even-order distortion component compensation circuit 8 is an n-order distortion component compensation circuit for compensating (removing) the n-order distortion component for the in-phase signal S3 and the quadrature signal S4 output from the A / D conversion circuit 6. (A general term for the second-order distortion component compensation circuit 81, the fourth-order distortion component compensation circuit 82, the sixth-order distortion component compensation circuit 83, etc.). The even-order distortion component compensating circuit 8 is generated in the receiving circuit A2 from a signal (wireless signal from the transmitting circuit A1 to the receiving circuit A2) wirelessly transmitted from the transmitting circuit A1 and wirelessly received by the receiving circuit A2. The distortion component is removed from the reception signal wirelessly received by the reception circuit A2. The even-order distortion component compensation circuit 8 outputs the in-phase signal S3 and the quadrature signal S4 after compensation of the n-order distortion component to the discriminator 10. The discriminator 10 generates reception data from the in-phase signal S3 and the quadrature signal S4 output from the even distortion component compensation circuit 8, and outputs the received data to the subsequent stage.

(First embodiment)
Next, the configuration of the nth-order distortion component compensation circuit 81a will be described with reference to FIG. The nth-order distortion component compensation circuit 81a is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, and the like. The nth-order distortion component compensation circuit 81a includes an nth multiplier 101 (nth power circuit), a shaping circuit 102, and a subtractor 103 (subtraction circuit). The n multiplier 101 generates n-order distortion components (nth power components) of these signals from the transmission signals (the in-phase signal S1 and the quadrature signal S2 output from the waveform shaping filter 7) generated in the transmission circuit A1. To do. The shaping circuit 102 shapes the nth order distortion component generated by the n multiplier 101. The subtractor 103 subtracts the nth-order distortion component after shaping by the shaping circuit 102 from the received signals (the in-phase signal S3 and the quadrature signal S4) input to the n-th order distortion component compensation circuit 81a.

  The shaping circuit 102 includes an adjustment circuit 104 (first adjustment circuit), a complex coefficient unit 105 (second adjustment circuit), and a control circuit 106. The adjustment circuit 104 includes a reception bandwidth limiting filter 107 and a delay circuit 108. The reception bandwidth limiting filter 107 determines the amplitude and phase of the nth-order distortion component (the nth-order distortion component of each of the in-phase signal S1 and the quadrature signal S2) generated by the n multiplier 101 based on preset parameters. Adjust. The reception bandwidth limiting filter 107 has a frequency characteristic equivalent to that of the LPF 4 c, and the nth order distortion component output from the reception bandwidth limitation filter 107 is the nth order distortion component output from the A / D conversion circuit 6. The signal bandwidth is equivalent to

  The delay circuit 108 converts the nth-order distortion component after being adjusted by the reception bandwidth limiting filter 107 into a predetermined time (after the signal is output from the waveform shaping filter 7, the transmission antenna 1, the reception antenna 2, and the direct conversion receiver). 4 and the A / D conversion circuit 6 and corresponding to the time until it is input to the nth-order distortion component compensation circuit 81a). As a result, the input timing of the nth-order distortion component input from the complex coefficient unit 105 to the subtracter 103 and the input timing of the distortion component (nth-order distortion component) input from the A / D conversion circuit 6 to the subtractor 103 are obtained. The same is true.

  The complex coefficient unit 105 adjusts the amplitude and phase of the nth-order distortion component delayed and output from the adjustment circuit 104 based on the control signal from the control circuit 106, and subtracts the n-th order distortion component after this adjustment. Output to. Hereinafter, the amplitude and phase may be referred to as “complex”.

  The control circuit 106 uses the received signal (the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103), and the complex coefficient unit 105 performs the amplitude and phase of the nth-order distortion component output from the adjustment circuit 104. A control signal for controlling the adjustment process is generated, and the generated control signal is output to the complex coefficient unit 105. The control circuit 106 includes a discriminator 109, a subtractor 110, a complex correlator 111 and a loop filter 112. The discriminator 109 and the subtractor 110 extract the nth-order distortion component contained in the in-phase signal S3 and the quadrature signal S4 from the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103. The complex correlator 111 calculates the correlation amount (correlation amount with respect to amplitude and phase) between the n-th order distortion component output from the subtractor 110 and the n-th order distortion component output from the adjustment circuit 104, and this correlation amount. Is output to the complex coefficient unit 105 via the loop filter 112. The correlation amount calculated by the complex correlator 111 is a correlation amount in each of the in-phase signal S1 and the quadrature signal S2.

  Based on the control signal input from the complex correlator 111 via the loop filter 112, the complex coefficient unit 105 determines that the amplitude and phase of the nth-order distortion component input from the complex coefficient unit 105 to the subtractor 103 are A / The amplitude and phase of the nth-order distortion component input from the complex coefficient unit 105 to the subtractor 103 are the same as the amplitude and phase of the distortion component (nth-order distortion component) input from the D conversion circuit 6 to the subtractor 103. Adjust the phase (adjustment using feedback).

  Thus, the amplitude and phase of the nth-order distortion component (in-phase signal S1 and quadrature signal S2) input from the complex coefficient unit 105 to the subtractor 103 and the input timing are determined by the adjustment circuit 104 and the complex coefficient unit 105. By the amplitude and phase adjustment processing and the delay processing, the amplitude and level of the n-th order distortion component of the in-phase signal S3 and the quadrature signal S4 input from the A / D conversion circuit 6 to the subtractor 103 and the input timing are the same. It becomes.

  As described above, in the first embodiment, the in-phase signal S3 and the quadrature signal S4 input to the nth-order distortion component compensation circuit 81a are transmitted from the transmission antenna 1 and input to the direct conversion receiver 4 via the reception antenna 2. In the case where the n-th order distortion component generated from the received signal is included, the generated n-th order distortion component can be removed from the in-phase signal S3 and the quadrature signal S4.

  The complex correlator 111 may have the functions of the discriminator 109 and the subtractor 110. In this case, the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103 are directly input to the complex correlator 111.

(Second Embodiment)
The wireless communication apparatus A may use an nth-order distortion component compensation circuit 81b shown in FIG. 3 instead of the nth-order distortion component compensation circuit 81a according to the first embodiment. The nth-order distortion component compensation circuit 81b is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, and the like. The nth-order distortion component compensation circuit 81 b includes an nth multiplier 101, a shaping circuit 113, and a subtractor 103. The n multiplier 101 generates n-order distortion components (nth power components) of these signals from the transmission signals (the in-phase signal S1 and the quadrature signal S2 output from the waveform shaping filter 7) generated in the transmission circuit A1. To do. The shaping circuit 113 shapes the nth order distortion component generated by the n multiplier 101. The subtractor 103 subtracts the nth-order distortion component shaped by the shaping / shaping circuit 113 from the received signals (the in-phase signal S3 and the quadrature signal S4) input to the n-th order distortion component compensation circuit 81b.

  The shaping circuit 113 includes an adjustment circuit 114 (first adjustment circuit), a complex transversal filter 115 (second adjustment circuit), and a control circuit 116. The adjustment circuit 114 includes a reception bandwidth limiting filter 107. The reception bandwidth limiting filter 107 determines the amplitude and phase of the nth-order distortion component (the nth-order distortion component of each of the in-phase signal S1 and the quadrature signal S2) generated by the n-th multiplier 101 based on preset parameters. Adjust. Based on the control of the control circuit 116, the complex transversal filter 115 further adjusts the amplitude and phase of the adjusted n-th order distortion component output from the adjustment circuit 114, and further adjusts this adjusted n-th order distortion component. The output is delayed and output to the subtracter 103.

  The control circuit 116 uses the received signal (the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103), and the complex transversal filter 115 for the amplitude and phase of the nth-order distortion component output from the adjustment circuit 114. A control signal for controlling the adjustment processing of the second and the delay processing of the complex transversal filter 115 for the nth-order distortion component is generated, and the generated control signal is output to the complex transversal filter 115.

  The control circuit 116 includes a discriminator 109, a subtractor 110, a complex transversal correlator 117, and a tap coefficient control circuit 118. The complex transversal correlator 117 is a transversal-type correlation amount (correlation with respect to amplitude, phase, and delay time) between the n-th order distortion component output from the subtractor 110 and the n-th order distortion component output from the adjustment circuit 104. Amount) is calculated and output to the tap coefficient control circuit 118. The correlation amount calculated by the complex transversal correlator 117 is the correlation amount in each of the in-phase signal S1 and the quadrature signal S2. The tap coefficient control circuit 118 adjusts a control parameter for controlling the complex transversal filter 115 (tap coefficient in the complex transversal filter 115) based on the correlation amount input from the complex transversal correlator 117. A control signal (control signal for controlling adjustment processing and delay processing of the complex transversal filter 115) including the adjusted control parameter is output to the complex transversal filter 115.

  Based on the control signal from the tap coefficient control circuit 118, the complex transversal filter 115 determines that the amplitude and phase of the nth-order distortion component input from the complex transversal filter 115 to the subtracter 103 and the input timing are A / D. The nth-order distortion component input from the complex transversal filter 115 to the subtractor 103 so that the amplitude and phase of the distortion component (nth-order distortion component) input from the conversion circuit 6 to the subtractor 103 and the input timing are the same. And the input timing are adjusted.

  As described above, the amplitude and phase of the nth-order distortion component (in-phase signal S1 and quadrature signal S2) input from the complex transversal filter 115 to the subtractor 103 and the input timing are the adjustment circuit 114 and the complex transversal filter. The amplitude and phase of the n-order distortion component of the in-phase signal S3 and the quadrature signal S4 input from the A / D conversion circuit 6 to the subtracter 103 and the input timing by the amplitude and phase adjustment processing and delay processing by 115. The same is true.

  As described above, in the second embodiment, the in-phase signal S3 and the quadrature signal S4 input to the nth-order distortion component compensation circuit 81b are transmitted from the transmission antenna 1 and input to the direct conversion receiver 4 via the reception antenna 2. In the case where the n-th order distortion component generated from the received signal is included, the generated n-th order distortion component can be removed from the in-phase signal S3 and the quadrature signal S4. Further, the complex transversal filter 115 adjusts the nth-order distortion component output from the adjustment circuit 114 using the transversal type correlation amount, so that in addition to the adjustment of the amplitude and phase of the nth-order distortion component, the subtractor The input timing of the nth-order distortion component to 103 can be adjusted based on the received signals (in-phase signal S3 and quadrature signal S4).

  The complex transversal correlator 117 may have the functions of the discriminator 109 and the subtractor 110. In this case, the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103 are directly input to the complex transversal correlator 117.

(Third embodiment)
The wireless communication apparatus A may use an nth-order distortion component compensation circuit 81c shown in FIG. 4 instead of the nth-order distortion component compensation circuit 81a according to the first embodiment. The nth-order distortion component compensation circuit 81c is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, and the like. The nth order distortion component compensation circuit 81c includes a control circuit 120 instead of the control circuit 106 of the nth order distortion component compensation circuit 81a according to the first embodiment. The control circuit 120 includes an averaging circuit 121 instead of the loop filter 112 of the control circuit 106 according to the first embodiment. Further, the discriminator 109 and the subtractor 110 of the nth-order distortion component compensation circuit 81a according to the first embodiment extract the nth-order distortion component included in the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103. On the other hand, the discriminator 109 and the subtracter 110 of the control circuit 120 of the n-th order distortion component compensation circuit 81c extract the n-th order distortion component included in the in-phase signal S3 and the quadrature signal S4 input to the subtracter 103. To do.

  The nth-order distortion component compensation circuit 81 a according to the first embodiment performs feedback control using the received signal output from the subtractor 103, whereas the nth-order distortion component compensation circuit 81 c is added to the subtractor 103. Feed-forward control is performed using the input received signal.

  Except for the above points, the configuration of the nth-order distortion component compensation circuit 81c is the same as the configuration of the nth-order distortion component compensation circuit 81a according to the first embodiment. Therefore, in the third embodiment, the in-phase signal S3 and the quadrature signal S4 input to the nth-order distortion component compensation circuit 81c are transmitted from the transmission antenna 1 and input to the direct conversion receiver 4 via the reception antenna 2. When the n-th order distortion component generated from the received signal is included, the generated n-th order distortion component can be removed from the in-phase signal S3 and the quadrature signal S4.

  The complex correlator 111 may have the functions of the discriminator 109 and the subtractor 110. In this case, the in-phase signal S3 and the quadrature signal S4 input to the subtractor 103 are directly input to the complex correlator 111.

(Fourth embodiment)
The wireless communication apparatus A may use an nth-order distortion component compensation circuit 81d shown in FIG. 5 instead of the nth-order distortion component compensation circuit 81a according to the first embodiment. The nth-order distortion component compensation circuit 81d is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, and the like. The discriminator 109 and the subtractor 110 of the nth-order distortion component compensation circuit 81b according to the second embodiment extract the nth-order distortion component included in the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103. On the other hand, the discriminator 109 and the subtractor 110 of the nth-order distortion component compensation circuit 81d extract the nth-order distortion component included in the in-phase signal S3 and the quadrature signal S4 input to the subtractor 103.

  The nth-order distortion component compensation circuit 81b according to the second embodiment performs feedback control using the received signal output from the subtractor 103, whereas the nth-order distortion component compensation circuit 81d is connected to the subtractor 103. Feed-forward control is performed using the input received signal.

  Except for the above points, the configuration of the nth-order distortion component compensation circuit 81d is the same as the configuration of the nth-order distortion component compensation circuit 81b according to the second embodiment. Therefore, in the fourth embodiment, the in-phase signal S3 and the quadrature signal S4 input to the nth-order distortion component compensation circuit 81d are transmitted from the transmission antenna 1 and input to the direct conversion receiver 4 via the reception antenna 2. When the n-th order distortion component generated from the received signal is included, the generated n-th order distortion component can be removed from the in-phase signal S3 and the quadrature signal S4.

  The complex transversal correlator 117 may have the functions of the discriminator 109 and the subtractor 110. In this case, the in-phase signal S3 and the quadrature signal S4 input to the subtractor 103 are directly input to the complex transversal correlator 117.

(Fifth embodiment)
The wireless communication apparatus A may use an nth-order distortion component compensation circuit 81e shown in FIG. 6 instead of the nth-order distortion component compensation circuit 81a according to the first embodiment. The nth-order distortion component compensation circuit 81e is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, and the like. In the fifth embodiment, both the transmission circuit A1 and the reception circuit A2 of the wireless communication apparatus A perform signal transmission based on the CDMA system (particularly, FDD-CDMA system) (FDD: Frequency Division Duplex, CDMA: Code Division Multiple Access). Applicable when sending and receiving. The transmission circuit A1 according to the fifth embodiment wirelessly transmits a signal subjected to spreading processing using a predetermined spreading code used in the CDMA system, and the receiving circuit A2 wirelessly transmits the signal subjected to spreading processing using the above spreading code. Receive.

  The nth-order distortion component compensation circuit 81e includes an extraction circuit 122, a subtracter 103, and a delay circuit 123. The extraction circuit 122 includes a transmission n-th power component extraction circuit 124, a gain control circuit 125, and a mixer 126.

  The transmission n-th power component extraction circuit 124 uses an n-order distortion component (in-phase signal S3 and quadrature signal S4) input to the direct conversion receiver 4 via the reception antenna 2 from the received signal. n-th component) is extracted using the spreading code inputted from the transmission circuit A1. The transmission n-th power component extraction circuit 124 first generates the n-th power component of the spread code input from the transmission circuit A1. Then, the transmission n-th power component extraction circuit 124 despreads the received signal (the in-phase signal S3 and the quadrature signal S4) using the n-th power component of the spreading code. The transmission nth power component extraction circuit 124 extracts the nth order distortion component included in the received signal from the despread received signal, and the extracted nth order distortion component is the nth power of the above spreading code. Diffuse with ingredients. Then, the transmission nth power component extraction circuit 124 outputs the nth-order distortion component after spreading to the mixer 126. Also, the transmission n-th power component extraction circuit 124 outputs the nth-order distortion component included in the received signal after despreading to the gain control circuit 125.

  Based on the amplitude of the nth-order distortion component input from the transmission nth power component extraction circuit 124, the gain control circuit 125 determines the amplitude of the nth order distortion component after diffusion output from the transmission nth power component extraction circuit 124 to the mixer 126. Is the same as the amplitudes of the in-phase signal S3 and the quadrature signal S4 output from the delay circuit 123 to the subtracter 103, and the nth order after spreading output from the transmission n-th power component extraction circuit 124 to the mixer 126. A control signal (control signal for the mixer 126) for adjusting the amplitude of the distortion component is generated, and this control signal is output to the mixer 126. Based on the control signal input from the gain control circuit 125, the mixer 126 adjusts the gain of the nth-order distortion component after diffusion input from the transmission n-th power component extraction circuit 124, and the gain adjusted n The next distortion component is output to the subtractor 103.

  The delay circuit 123 uses the n-th order distortion component extracted by the extraction circuit 122 for a predetermined time (after the signal is output from the waveform shaping filter 7, the transmission antenna 1, the reception antenna 2, the direct conversion receiver 4, and the A / D conversion). This is delayed by an amount equivalent to the time until it is input to the nth-order distortion component compensation circuit 81e via the circuit 6. The input timing of the nth-order distortion component input from the extraction circuit 122 to the subtractor 103 is the same as the input timing of the in-phase signal S3 and the quadrature signal S4 input to the subtracter 103 after being delayed by the delay circuit 123. . The subtractor 103 subtracts the nth-order distortion component extracted by the extraction circuit 122 from the in-phase signal S3 and the quadrature signal S4 input from the delay circuit 123.

  As described above, in the fifth embodiment, the in-phase signal S3 and the quadrature signal S4 input to the n-order distortion component compensation circuit 81e of the wireless communication apparatus A based on the CDMA system are transmitted from the transmission antenna 1 and passed through the reception antenna 2. In the case where an n-order distortion component generated from the received signal input to the direct conversion receiver 4 is included, the generated n-order distortion component is converted into the in-phase signal S3 and the quadrature phase using a spreading code. It can be removed from the signal S4.

  Although the extraction circuit 122 has the gain control circuit 125, the nth-order distortion after spreading output from the transmission n-th power component extraction circuit 124 to the mixer 126 without the gain control circuit 125. The amplitudes of the components are the same as the amplitudes of the in-phase signal S3 and the quadrature signal S4 output from the delay circuit 123 to the subtracter 103. The gain control circuit 125 can be used to finely adjust the amplitude of the nth-order distortion component after spreading output from the transmission n-th power component extraction circuit 124 to the mixer 126.

(Sixth embodiment)
The wireless communication apparatus A may use an nth-order distortion component compensation circuit 81f shown in FIG. 7 instead of the nth-order distortion component compensation circuit 81a according to the first embodiment. The nth-order distortion component compensation circuit 81f is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, and the like. The sixth embodiment corresponds to a case where both the transmission circuit A1 and the reception circuit A2 of the wireless communication apparatus A perform signal transmission / reception based on the CDMA system (particularly, the FDD-CDMA system). The transmission circuit A1 according to the sixth embodiment wirelessly transmits a signal subjected to spreading processing using a predetermined spreading code used in the CDMA system, and the receiving circuit A2 wirelessly transmits the signal subjected to spreading processing using the above spreading code. Receive.

  The nth-order distortion component compensation circuit 81 f includes an nth multiplier 101, a shaping circuit 127, and a subtractor 103. The n multiplier 101 generates n-order distortion components (nth power components) of these signals from the transmission signals (the in-phase signal S1 and the quadrature signal S2 output from the waveform shaping filter 7) generated in the transmission circuit A1. To do. The shaping circuit 127 shapes the nth order distortion component generated by the n multiplier 101. The subtracter 103 subtracts the nth-order distortion component after shaping by the shaping circuit 127 from the received signals (the in-phase signal S3 and the quadrature signal S4) input to the n-th order distortion component compensation circuit 81f.

  The shaping circuit 127 includes an adjustment circuit 114, a complex transversal filter 115, and a control circuit 128. The adjustment circuit 114 includes a reception bandwidth limiting filter 107. The reception bandwidth limiting filter 107 determines the amplitude and phase of the nth order distortion component (the nth order distortion components of the in-phase signal S1 and the quadrature signal S2) generated by the n multiplier 101 based on preset parameters. Adjust. Based on the control of the control circuit 128, the complex transversal filter 115 further adjusts the amplitude and phase of the adjusted nth-order distortion component output from the adjustment circuit 114, and further adjusts the further adjusted nth-order distortion component. The output is delayed and output to the subtracter 103.

  The control circuit 128 uses the spread code input from the transmission circuit A1 and the received signal (in-phase signal S3 and quadrature signal S4) output from the subtractor 103 to control the amplitude and phase of the nth-order distortion component. A control signal for controlling the adjustment process of the complex transversal filter 115 and the delay process of the complex transversal filter 115 for the nth-order distortion component is generated, and the generated control signal is output to the complex transversal filter 115. .

  The control circuit 128 includes a transmission n-th power component searcher 129 and a tap coefficient control circuit 118. The transmission n-th power component searcher 129 uses the spreading code input from the transmission circuit A1, the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103, and uses the in-phase signal S3 and the quadrature signal S4. N-th order distortion components included in. The tap coefficient control circuit 118 adjusts a control parameter for controlling the complex transversal filter 115 (tap coefficient in the complex transversal filter 115) based on the nth-order distortion component extracted by the transmission n-th power component searcher 129. Then, a control signal including the adjusted control parameter (a control signal for controlling adjustment processing and delay processing of the complex transversal filter 115) is output to the complex transversal filter 115.

  Based on the control signal from the tap coefficient control circuit 118, the complex transversal filter 115 determines that the amplitude and phase of the nth-order distortion component input from the complex transversal filter 115 to the subtracter 103 and the input timing are A / D. The nth-order distortion component input from the complex transversal filter 115 to the subtractor 103 so that the amplitude and phase of the distortion component (nth-order distortion component) input from the conversion circuit 6 to the subtractor 103 and the input timing are the same. And the input timing are adjusted.

  As described above, the amplitude and phase of the nth-order distortion component (in-phase signal S1 and quadrature signal S2) input from the complex transversal filter 115 to the subtractor 103 and the input timing are the adjustment circuit 114 and the complex transversal filter. The amplitude and phase of the n-order distortion component of the in-phase signal S3 and the quadrature signal S4 input from the A / D conversion circuit 6 to the subtracter 103 and the input timing by the amplitude and phase adjustment processing and delay processing by 115. The same is true.

  As described above, in the sixth embodiment, the in-phase signal S3 and the quadrature signal S4 input to the n-order distortion component compensation circuit 81f of the wireless communication apparatus A based on the CDMA system are transmitted from the transmission antenna 1 and passed through the reception antenna 2. In the case where an n-order distortion component generated from the received signal input to the direct conversion receiver 4 is included, the generated n-order distortion component is converted into the in-phase signal S3 and the quadrature phase using a spreading code. It can be removed from the signal S4.

(Seventh embodiment)
The wireless communication apparatus A may use an nth-order distortion component compensation circuit 81g shown in FIG. 8 instead of the nth-order distortion component compensation circuit 81a according to the first embodiment. The nth-order distortion component compensation circuit 81g is a second-order distortion component compensation circuit 81, a fourth-order distortion component compensation circuit 82, a sixth-order distortion component compensation circuit 83, or the like. The transmission nth power component searcher 129 of the nth order distortion component compensation circuit 81f according to the sixth embodiment extracts the nth order distortion component included in the in-phase signal S3 and the quadrature signal S4 output from the subtractor 103. On the other hand, the transmission nth power component searcher 129 of the nth order distortion component compensation circuit 81g extracts the nth order distortion component included in the in-phase signal S3 and the quadrature signal S4 input to the subtractor 103.

  The nth-order distortion component compensation circuit 81f according to the sixth embodiment performs feedback control using the received signal output from the subtractor 103, whereas the nth-order distortion component compensation circuit 81g is added to the subtractor 103. Feed-forward control is performed using the input received signal.

  Except for the above points, the configuration of the nth-order distortion component compensation circuit 81g is the same as the configuration of the nth-order distortion component compensation circuit 81f according to the sixth embodiment. Therefore, in the seventh embodiment, the in-phase signal S3 and the quadrature signal S4 input to the nth-order distortion component compensation circuit 81g of the wireless communication apparatus A based on the CDMA system are transmitted from the transmission antenna 1 and passed through the reception antenna 2. When an n-order distortion component generated from a received signal input to the direct conversion receiver 4 is included, the generated n-order distortion component is converted into an in-phase signal S3 and a quadrature signal using a spreading code. It can be removed from S4.

  Next, functions and effects of the wireless communication device A according to the embodiment will be described. In the first to fourth embodiments and the sixth and seventh embodiments, the wireless communication device A includes a transmission circuit A1 that wirelessly transmits a signal and a reception circuit A2 that wirelessly receives the signal. The reception circuit A2 transmits a distortion component generated in the reception circuit A2 from a signal (radio signal from the transmission circuit A1 to the reception circuit A2) wirelessly transmitted from the transmission circuit A1 and wirelessly received by the reception circuit A2. Even-numbered distortion component compensation circuit 8 (nth-order distortion component compensation circuits 81a to 81d, 81f, 81g) is removed from the received signal received wirelessly in A2. The even distortion component compensation circuit 8 includes an n multiplier 101, a shaping circuit 102 (or a shaping circuit 113, a shaping circuit 119, and a shaping circuit 127) and a subtractor 103. The nth multiplier 101 generates an nth-order distortion component of this signal from the signal for transmission generated in the transmission circuit A1. The shaping circuit 102 (or the shaping circuit 113, the shaping circuit 119, and the shaping circuit 127) shapes the nth-order distortion component generated by the nth multiplier 101. The subtracter 103 subtracts (removes) the n-order distortion component after shaping by the shaping circuit 102 (or the shaping circuit 113, the shaping circuit 119, and the shaping circuit 127) from the reception signal received by the reception circuit A2.

  Further, the wireless communication apparatus A according to the fifth embodiment wirelessly receives a transmission circuit A1 that wirelessly transmits a signal that has been spread using a predetermined spreading code, and a signal that has been spread using the spreading code. And a receiving circuit A2. The reception circuit A2 removes the distortion component generated in the reception circuit A2 from the signal wirelessly transmitted from the transmission circuit A1 and received by the reception circuit A2, from the reception signal wirelessly received by the reception circuit A2. A component compensation circuit 8 (nth-order distortion component compensation circuit 81e) is included. The even distortion component compensation circuit 8 includes an extraction circuit 122, a delay circuit 123, and a subtractor 103. The extraction circuit 122 extracts the nth-order distortion component included in the received signal from the received signal received by the receiving circuit A2 using the above spreading code. The delay circuit 123 delays the n-th order distortion component extracted by the extraction circuit 122 by a predetermined time and outputs it. The subtractor 103 subtracts (removes) the n-order distortion component output from the delay circuit 123 from the reception signal received by the reception circuit A2.

  Therefore, according to the wireless communication apparatus A in the first to seventh embodiments, an n-order distortion component is generated from the transmission signal generated in the transmission circuit A1, and the received signal is generated using the n-order distortion component. The included distortion component (the distortion component included in the wraparound signal from the transmission circuit A1 to the reception circuit A2) can be removed. Therefore, in the wireless communication apparatus A provided with the transmission circuit A1 and the reception circuit A2, quality deterioration of the reception signal received by the reception circuit A2 can be suppressed. Furthermore, since it is not necessary to arrange the transmitting antenna 1 and the receiving antenna 2 so that the signal transmitted from the transmitting circuit A1 is not received by the receiving circuit A2, the transmitting antenna 1 and the receiving antenna 2 can be arranged flexibly. Furthermore, since it is not necessary to provide an amplifier or a mixer that does not generate higher-order distortion components, the cost required for manufacturing the amplifier or the mixer can be suppressed.

  Furthermore, in the first and third embodiments, the shaping circuit 102 (or the shaping circuit 119) includes an adjustment circuit 104, a complex coefficient unit 105, and a control circuit 106 (or control circuit 120). The adjustment circuit 104 adjusts the amplitude and phase of the nth order distortion component based on a preset parameter, and outputs the adjusted nth order distortion component with a delay of a predetermined time. The complex coefficient unit 105 performs adjustment processing for adjusting the amplitude and phase of the nth-order distortion component output from the adjustment circuit 104 based on a control signal from the control circuit 106 (or the control circuit 120). The control circuit 106 (or the control circuit 120) generates this control signal based on the reception signal received by the reception circuit A2, and outputs the generated control signal to the complex coefficient unit 105.

  In the second and fourth embodiments, the shaping circuit 113 includes an adjustment circuit 114, a complex transversal filter 115, and a control circuit 116. The adjustment circuit 114 adjusts the amplitude and phase of the nth-order distortion component based on a preset parameter. The complex transversal filter 115 performs adjustment processing for adjusting the amplitude and phase of the adjusted n-order distortion component output from the adjustment circuit 114, and delay processing for delaying and outputting the adjusted n-order distortion component. , Based on a control signal from the control circuit 116. The control circuit 116 generates this control signal based on the reception signal received by the reception circuit A2, and outputs the generated control signal to the complex transversal filter 115.

  In the sixth and seventh embodiments, the transmission circuit A1 wirelessly transmits a signal that has been spread using a predetermined spreading code, and the reception circuit A2 wirelessly receives the signal that has been spread by the spreading code. . The shaping circuit 127 includes an adjustment circuit 114, a complex transversal filter 115, and a control circuit 128. The adjustment circuit 114 adjusts the amplitude and phase of the nth-order distortion component based on a preset parameter. The complex transversal filter 115 performs adjustment processing for adjusting the amplitude and phase of the adjusted n-order distortion component output from the adjustment circuit 114, and delay processing for delaying and outputting the adjusted n-order distortion component. , Based on a control signal from the control circuit 128. The control circuit 128 generates the control signal based on the spreading code and the received signal received by the receiving circuit A2, and outputs the generated control signal to the complex transversal filter 115.

  Furthermore, in the first to fourth embodiments and the sixth and seventh embodiments, the reception signal received by the reception circuit A2 is output from the reception signal input to the subtractor 103 or the subtracter 103. It is preferably one of the received signals. As described above, the feedforward control may be performed using the reception signal input to the subtracter 103 (third, fourth, and seventh embodiments), or the reception signal output from the subtractor 103 may be used. Feedback control may be performed (first, second and sixth embodiments).

It is a figure which shows the structure of the radio | wireless communication apparatus which concerns on embodiment. It is a figure which shows the structure of the nth-order distortion component compensation circuit which concerns on embodiment. It is a figure which shows the other structure of the nth-order distortion component compensation circuit which concerns on embodiment. It is a figure which shows the other structure of the nth-order distortion component compensation circuit which concerns on embodiment. It is a figure which shows the other structure of the nth-order distortion component compensation circuit which concerns on embodiment. It is a figure which shows the other structure of the nth-order distortion component compensation circuit which concerns on embodiment. It is a figure which shows the other structure of the nth-order distortion component compensation circuit which concerns on embodiment. It is a figure which shows the other structure of the nth-order distortion component compensation circuit which concerns on embodiment.

Explanation of symbols

A ... wireless communication device, A1 ... transmission circuit, A2 ... reception circuit, 1 ... transmission antenna, 10, 109 ... discriminator, 101 ... n-thrower, 102, 113, 119, 127 ... shaping circuit, 103, 110 ... subtraction 104, 114 ... adjustment circuit, 105 ... complex coefficient unit, 106, 116, 120, 128 ... control circuit, 107 ... reception bandwidth limiting filter, 108, 123 ... delay circuit, 111 ... complex correlator, 112 ... loop 115, complex transversal filter, 117, complex transversal correlator, 118, tap coefficient control circuit, 121, averaging circuit, 122, extraction circuit, 124, transmission n-th component extraction circuit, 125, gain control circuit, 126 ... mixer, 129 ... transmission n-th power component searcher, 2 ... receiving antenna, 3 ... transmitter, 4 ... direct conversion receiver, 4a ... an 4c ... LPF, 4b ... mixer, 5 ... D / A conversion circuit, 6 ... A / D conversion circuit, 7 ... waveform shaping filter, 8 ... even-order distortion component compensation circuit, 81 ... n-order distortion component compensation circuit, 81a , 81b, 81c, 81d, 81e, 81f, 81g... Nth order distortion component compensation circuit, 82... 4th order distortion component compensation circuit, 83.

Claims (2)

A transmission circuit that wirelessly transmits a signal that has been spread using a predetermined spreading code ;
A wireless communication device comprising: a receiving circuit that wirelessly receives the spread signal;
The receiving circuit is
A distortion component compensation circuit for removing a distortion component generated in the reception circuit from a sneak signal from the transmission circuit to the reception circuit from a reception signal wirelessly received in the reception circuit;
The distortion component compensation circuit includes:
An n-th power circuit that generates an n-th power component of the signal (n is an even number) from a transmission signal generated in the transmission circuit;
A shaping circuit that has a first adjustment circuit, a second adjustment circuit, and a control circuit, and shapes the n-th power component generated by the n-th power circuit;
The n-th power component after shaping by the shaping circuit have a subtraction circuit for subtracting from the received signal,
The first adjustment circuit adjusts the amplitude and phase of the n-th power component based on a preset parameter;
The second adjustment circuit adjusts the amplitude and phase of the adjusted n-th power component output from the first adjustment circuit, and delay processing for delaying and outputting the adjusted n-th power component And based on a control signal from the control circuit,
The control circuit is based on the spreading code and the received signal before the n-th power component is subtracted by the subtraction circuit and the signal after the n-th power component is subtracted by the subtraction circuit. Generating the control signal and outputting the generated control signal to the second adjustment circuit;
A wireless communication apparatus. A transmission circuit that wirelessly transmits a signal that has been spread using a predetermined spreading code;
A wireless communication device comprising: a receiving circuit that wirelessly receives the spread signal;
The receiving circuit is
A distortion component compensation circuit for removing a distortion component generated in the reception circuit from a sneak signal from the transmission circuit to the reception circuit from a reception signal wirelessly received in the reception circuit;
The distortion component compensation circuit includes:
An extraction circuit that extracts an n-th power component (n is an even number) included in the received signal from the received signal using the spreading code;
A delay circuit that outputs the n-th power component extracted by the extraction circuit with a delay of a predetermined time;
A wireless communication apparatus comprising: a subtracting circuit that subtracts the n-th power component output from the delay circuit from the received signal.

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