JP2017028362A - Transmission reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission reception device which can improve a removal performance of a self-interference signal even when receiving random time fluctuation of a sneak self-interference signal.SOLUTION: A transmission reception device 150 that simultaneously sends and receives radio wave at the same frequency bandwidth comprises: a replica generation unit 15 which generates a replica signal of a transmitter signal using the transmitter signal that the transmission reception device sends; a feedback unit 70 which generates a feedback signal; a detector which detects a time when a sneak self-interference signal arrives using an input signal; a controller 80 which acquires difference information between the feedback signal and the sneak self-interference signal to control the replica generation unit by using the acquired difference information and the detected time; a cancel unit 90 which removes the sneak self-interference signal from the input signal using the feedback signal on the basis of the detected time; and a determination unit 81 which compares a residual component of the sneak self-interference signal left in the input signal with a threshold value to determine whether the sneak self-interference signal is removed from the input signal or not.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transceiver that performs simultaneous transmission and reception of radio waves in the same frequency band.

  In recent years, with the development of wireless communication systems such as mobile phones and wireless LANs, frequency demand has increased, and in order to improve frequency utilization efficiency, a technique for performing simultaneous transmission and reception using the same frequency has been proposed.

  In this technique, the reception antenna receives a transmission signal (hereinafter also referred to as a wraparound self-interference signal) that has wrapped around with a very high power, and thus it is necessary to remove the wraparound self-interference signal with high accuracy. For example, using a known transmission signal, the timing, amplitude, and phase of the wraparound self-interference signal are estimated, the transmission signal is branched in the transmitter / receiver, and adjusted to the same level as the delay unit that matches the timing with the wraparound self-interference signal. Techniques have been proposed in which anti-phase synthesis is performed using an attenuator, a phase shifter for phase matching, and a multiplexer to remove a wraparound self-interference signal (see, for example, Non-Patent Documents 1 and 2).

  Also, using known transmission signals, the timing and channel characteristics of the sneaking self-interference signal are estimated, a separate transmission processing unit with the same configuration is prepared separately, and the sneaking self-interference signal is generated by the predistortion technique, and the anti-phase synthesis is performed. Thus, a technique for removing the sneaking self-interference signal has been proposed (see, for example, Non-Patent Document 3).

D. Korpi, et. Al., "Widely Linear Digital Self-Interference Cancellation in Direct-Conversion Full-Duplex Transceiver", IEEE Journal on Selected Areas in Communications, vol.32, no.9, pp.1674-1687, Sept . 2014 V. Syrjala, et. Al., "Analysis of oscillator phase-noise effects on self-interference cancellation in full-duplex OFDM radio transceivers", IEEE Transactions on Wireless Communications, vol.13, no.6, pp.2977-2990 , June 2014 R. Askar, et. Al., "Active self-interference cancellation mechanism for full-duplex wireless transceivers", 9th International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM) 2014. pp.539-544, June 2014

  However, in Non-Patent Documents 1 and 2, it is necessary to set the timing, amplitude, and phase with high precision. However, if the sneaking self-interference signal undergoes random fluctuations in the transmission / reception circuit, the estimation error is large. There is a problem that the residual component of the self-interference signal that is sneaking around remains superimposed.

  Further, in Non-Patent Document 3, since a self-interference signal is generated by using a predistortion technique, there is a time difference between the time when the parameter is estimated and the time when the canceling process is performed. There is a problem of becoming.

  The present invention can generate a signal for removing a wraparound self-interference signal from a received signal with high accuracy even when the wraparound self-interference signal is subject to random fluctuations in the transceiver, and can improve the removal performance. An object is to provide a transceiver.

  A first invention is a transmitter / receiver that performs simultaneous transmission / reception of radio waves in the same frequency band, and a first generation unit that generates a replica signal that is a replica of a transmission signal using a transmission signal transmitted by the transmitter / receiver, and transmission / reception A reception process performed on the received signal received by the machine is performed on the replica signal of the transmission signal, and a feedback unit that generates a feedback signal and a transmission signal of the own device among the signals included in the reception signal are rotated. The detection unit that detects the arrival time of the wraparound self-interference signal using the received signal, the feedback signal and the wraparound self-interference signal are compared, and the amplitude and phase between the feedback signal and the wraparound self-interference signal are compared. Difference information indicating a difference is obtained, and a control unit that controls the first generation unit using the obtained difference information and the detected time, and a process based on the detected time. A cancellation unit that removes the wraparound self-interference signal from the received signal using the back signal as a replica signal of the wraparound self-interference signal, and a residual component and threshold value of the wraparound self-interference signal remaining in the received signal from which the wraparound self-interference signal is removed And a determination unit that determines whether or not the self-interference signal has been removed from the reception signal output from the cancel unit.

  In the second aspect of the invention, the first generation unit generates a replica signal of the self-interference signal from the replica signal of the transmission signal using the difference information at a timing based on the detected time, and the cancellation unit generates the first generation signal. The self-interference signal is removed from the received signal using the replica signal of the self-interference signal generated by the unit.

  A third invention includes at least one second generation unit that generates a replica signal of a wraparound self-interference signal from a replica signal of a transmission signal using difference information, and the detection unit includes a wraparound self-interference included in the received signal. The time at which the signal arrives is detected according to the number of second generation units, and the control unit causes the second generation unit to generate a replica signal of the self-interference signal at a timing based on the detected time, and the cancellation unit The wraparound self-interference signal is removed from the received signal using the replica signal of the wraparound self-interference signal generated by the second generation unit.

  According to a fourth aspect of the invention, an extraction unit that extracts a time-varying component of a transmission signal is provided, and the first generation unit generates a replica signal of the transmission signal using the extracted time-varying component.

  A fifth invention is a transmitter / receiver that performs simultaneous transmission / reception of radio waves in the same frequency band, and a first generation unit that generates a replica signal that is a replica of a transmission signal using a transmission signal transmitted by the transmitter / receiver, and transmission / reception A feedback unit that generates a feedback signal by executing a process that excludes a part of the reception process performed on the received signal received by the machine on the replica signal of the transmission signal, and the transceiver receives the received signal. An extraction unit that extracts time-varying components corresponding to some of the excluded processing from the time-varying component of the received signal, and wraparound self-interference in which the transmission signal of the own device wraps around the signal included in the received signal A detection unit that detects the arrival time of the signal using the received signal, a second generation unit that generates a reference signal using the feedback signal, the extracted time variation component, and the detected time; The signal and the wraparound self-interference signal are compared, difference information indicating a difference in amplitude and phase between the reference signal and the wraparound self-interference signal is obtained, and a replica of the wraparound self-interference signal is obtained from the reference signal using the obtained difference information. A third generation unit that generates a replica signal, a cancellation unit that removes a wraparound self-interference signal from a received signal using a replica signal of the wraparound self-interference signal based on the detected time, and a wraparound self-interference signal A determination unit that compares a residual component of the wraparound self-interference signal remaining in the removed received signal with a threshold value and determines whether or not the wraparound self-interference signal is removed from the reception signal output from the cancel unit; It is characterized by.

  According to a sixth aspect of the invention, an extraction unit that extracts a time-varying component of a transmission signal is provided, and the first generation unit generates a replica signal of the transmission signal using the extracted time-varying component.

  The present invention can generate a signal for removing a wraparound self-interference signal from a received signal with high accuracy even when the wraparound self-interference signal is subject to random fluctuations in the transceiver, and can improve the removal performance. .

It is a figure which shows one Embodiment of a transmitter / receiver. It is a figure which shows an example of the transmission / reception process in the transmitter / receiver shown in FIG. It is a figure which shows another embodiment of a transmitter / receiver. It is a figure which shows an example of the transmission / reception process in the transmitter / receiver shown in FIG. It is a figure which shows another embodiment of a transmitter / receiver. It is a figure which shows an example of the transmission / reception process in the transmitter / receiver shown in FIG. It is a figure which shows another embodiment of a transmitter / receiver. It is a figure which shows an example of the transmission / reception process in the transmitter / receiver shown in FIG. It is a figure which shows another embodiment of a transmitter / receiver. It is a figure which shows an example of the transmission / reception process in the transmitter / receiver shown in FIG. It is a figure which shows another embodiment of a transmitter / receiver. It is a figure which shows another embodiment of a transmitter / receiver. It is a figure which shows another embodiment of a transmitter / receiver.

  Hereinafter, embodiments will be described with reference to the drawings.

  FIG. 1 illustrates one embodiment of a transceiver.

  The transceiver 150 illustrated in FIG. 1 includes a transmission unit 10, a replica generation unit 15, a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70, a control unit 80, and a cancellation unit 90.

  The transmission unit 10 includes a DAC (Digital to Analog Converter) 11, a mixer 12, and a PA (Power Amplifier) 13. The transmission unit 10 is connected to the transmission antenna 20 and transmits a transmission signal via the transmission antenna 20.

  The DAC 11 performs analog transmission of a digital transmission signal including data modulated by a modulation method such as QPSK (Quadrature Phase Shift Keying) by a modulator included in the transmission unit 10 based on a clock signal output from the clock generator 60. Convert to signal.

  The mixer 12 up-converts an analog transmission signal (that is, a baseband signal) including data to an RF (Radio Frequency) band frequency of a LO (Local) signal output from the local oscillator 50.

  The PA 13 amplifies the power of the generated transmission signal. Then, the transmission unit 10 outputs the transmission signal to the transmission antenna 20 and the replica generation unit 15, respectively.

  The replica generation unit 15 uses the transmission signal received from the transmission unit 10 to generate a replica signal that is a replica of the transmission signal. That is, the replica generation unit 15 sets the transmission signal received from the transmission unit 10 as a replica signal of the transmission signal. The replica generation unit 15 outputs a replica signal of the transmission signal to the feedback unit 70.

  The receiving unit 40 is connected to the receiving antenna 30 and receives a transmission signal transmitted from another transceiver via the receiving antenna 30. In addition, since the transmitter / receiver 150 performs simultaneous transmission / reception of the same frequency band, the reception unit 40 receives the transmission signal transmitted by the transmission unit 10 of its own device via the reception antenna 30. Hereinafter, of the received signals, the transmission signal of the own device that has sneak into the reception antenna 30 is also referred to as a sneak self-interference signal. The receiving unit 40 includes an LNA (Low Noise Amplifier) 41, a mixer 42, an AGC (Automatic Gain Control) 43, and an ADC (Analog to Digital Converter) 44.

  The LNA 41 is a low noise amplifier, and amplifies the reception signal received via the reception antenna 30.

  The mixer 42 down-converts from the frequency of the RF band to the frequency of the baseband signal using the LO signal output from the local oscillator 50. The mixer 42 outputs a baseband received signal to the AGC 43.

  The AGC 43 controls the power level of the received signal so that the power of the received baseband received signal is within a predetermined range, and outputs the controlled received signal to the ADC 44. In addition, the AGC 43 outputs a signal including gain information indicating the content of gain control performed on the received signal to the AGC 43 included in the feedback unit 70 described later.

  The ADC 44 converts the baseband received signal into a digital signal based on the clock signal output from the clock generator 60. Then, the reception unit 40 outputs the reception signal converted into the digital signal to the control unit 80 and the cancellation unit 90, respectively.

  The baseband signals described above may be IF (Intermediate Frequency) band signals (the same applies to the subsequent basebands).

  The local oscillator 50 is an oscillator such as a VCO (Voltage-Controlled Oscillator), and generates an LO signal having a predetermined frequency by controlling an oscillation frequency according to an applied voltage. The local oscillator 50 outputs the generated LO signal to each of the mixer 12 of the transmission unit 10, the mixer 42 of the reception unit 40, and the mixer 42 included in the feedback unit 70.

  The clock generator 60 generates a clock signal that operates the DAC 11 of the transmission unit 10, the ADC 44 of the reception unit 40, and the ADC 44 included in the feedback unit 70. The clock generator 60 outputs the generated clock signal to each of the DAC 11 of the transmission unit 10, the ADC 44 of the reception unit 40, and the DAC 44 of the feedback unit 70.

  The feedback unit 70 includes an LNA 41, a mixer 42, an AGC 43, and an ADC 44, similar to the receiving unit 40. That is, the feedback unit 70 performs the same reception process as the reception signal received by the reception unit 40 on the replica signal of the transmission signal received from the replica generation unit 15. The feedback unit 70 generates a feedback signal (that is, a replica signal of the wraparound self-interference signal) that has been subjected to the same reception process. The feedback unit 70 outputs the generated feedback signal to the control unit 80 and the cancellation unit 90.

  The control unit 80 is a processor or the like, and controls each element of the transceiver 150 by executing a program stored in a storage device such as a memory included in the transceiver 150.

  The control unit 80 uses the received signal received from the receiving unit 40 to detect the arrival time of the wraparound self-interference signal that the transmission signal of the own device wraps through the receiving antenna 30. For example, the control unit 80 compares the power of the reception signal received from the reception unit 40 with a predetermined value, and detects the time when the self-interference signal arrives at the time when the predetermined value is exceeded. Alternatively, the control unit 80 performs a correlation process between the feedback signal received from the feedback unit 70 and the received signal received from the receiving unit 40, and detects the time when the self-interference signal arrives around the time when the correlation value shows a peak. May be. Then, for example, the control unit 80 obtains the propagation time of the transmission signal from when the transmission unit 10 transmits the transmission signal until the reception unit 40 receives the self-interference signal. The propagation time is, for example, the sum of the passage times between the input and output of the transmission unit 10 and the reception unit 40 measured in advance according to the RF to be used, between the input time to the transmission unit 10 and the output time of the reception unit 40. It is calculated as the time subtracted from the time.

  Further, the control unit 80 compares the feedback signal generated by the feedback unit 70 with the wraparound self-interference signal included in the reception signal received from the reception unit 40 at the timing of the detected time. The control unit 80 obtains difference information indicating a relative amplitude and phase difference between the feedback signal and the wraparound self-interference signal. Then, the control unit 80 controls the replica generation unit 15 using the obtained difference information and the detected time. For example, the control unit 80 causes the replica generation unit 15 to generate a replica signal of the transmission signal whose amplitude and phase are changed using the difference information at the time when the wraparound self-interference signal arrives from the propagation time. The feedback unit 70 outputs the output. Thereby, the feedback unit 70 can generate a feedback signal that shows the same time variation as the reception signal output from the reception unit 40.

  Note that the LNA 41 of the feedback unit 70 may be omitted, and the amplitude and phase changes due to the LNA 41 may be added to the amplitude and phase changes in the replica generation unit 15.

  The control unit 80 operates as the determination unit 81 by executing a program. The determination unit 81 measures the remaining amount of the wraparound self-interference signal remaining in the reception signal from the power of the reception signal in the reception signal from which the wraparound self-interference signal has been removed by the cancellation unit 90. For example, in the training period in which the control unit 80 obtains the time of arrival of the sneaking self-interference signal and the difference information, the transceiver 150 transmits a transmission signal (training signal) including predetermined data. In other words, during the training period, the transceiver 150 does not receive any signals other than the transmitted self-interference signal of the training signal. Therefore, the determination unit 81 can measure the received signal received from the cancel unit 90, that is, the power of the remaining sneak self-interference signal as a residual error. Then, the determination unit 81 determines whether or not the measured residual error value is equal to or less than the training period threshold value. The threshold for the training period is a threshold set by the control unit 80 in the determination unit 81 during the training period, and is set based on the noise level and the allowable power of the remaining self-interference signal.

  The determination unit 81 determines that the wraparound self-interference signal has been removed by the cancel unit 90 when the residual error value is equal to or less than the training period threshold value. In this case, the control unit 80 stores in the storage device of the transceiver 150 the time when the detected sneak self-interference signal arrives and the propagation time and difference information obtained from the time of arrival. On the other hand, when the residual error value is larger than the training period threshold value, the determination unit 81 determines that the wraparound self-interference signal is not sufficiently removed from the received signal. In this case, the control unit 80 adjusts the time at which the wraparound self-interference signal arrives by executing an optimization algorithm such as an LMS (Least Mean Squares) algorithm so that the residual error value is minimized. Then, the control unit 80 repeatedly adjusts until the value of the residual error becomes equal to or less than the training period threshold (that is, the wraparound self-interference signal is removed by the cancel unit 90).

  And the control part 80 transfers to normal operation of simultaneous transmission / reception after a training period is complete | finished. The control unit 80 controls the operation of the replica generation unit 15 at any time using the difference information held in the storage device of the transceiver 150 at the time when the wraparound self-interference signal arrives from the propagation time obtained in the training period. .

  Note that, even during the normal operation period, the control unit 80 causes the determination unit 81 to measure the residual error of the self-interference signal, and compares the measured residual error value with the normal operation threshold value. If it is larger than the operation threshold, the training period may be resumed. The normal operation threshold is a threshold set by the control unit 80 in the determination unit 81 during the normal operation, and is based on the power received from other transceivers and the power of the remaining sneak self-interference signal allowed. Is set. In addition, the control unit 80 causes the determination unit 81 to measure an error rate such as a bit error rate or a packet error rate of a received signal received from another transmitter / receiver instead of the determination based on the residual error, and the measured error rate is predetermined. When it deteriorates from the value, it may be returned to the training period. Further, the control unit 80 may start from the training period every time the transceiver 150 is activated. Moreover, you may make it return to a training period with a predetermined period.

  The cancel unit 90 uses the feedback signal generated by the feedback unit 70 as a replica signal of the wraparound self-interference signal, and removes the wraparound self-interference signal included in the received signal. For example, the cancel unit 90 synthesizes the replica signal of the wraparound self-interference signal with the reception signal in the opposite phase at the time when the wraparound self-interference signal arrives, and removes the wraparound self-interference signal included in the reception signal. The cancel unit 90 outputs the received signal from which the wraparound self-interference signal has been removed to the determination unit 81. In addition, the transceiver 150 performs demodulation processing on the received signal from which the wraparound self-interference signal has been removed by the cancel unit 90.

  FIG. 2 shows an example of transmission / reception processing in the transceiver 150 shown in FIG. The processing illustrated in FIG. 2 is realized, for example, when a control unit 80 such as a processor included in the transceiver 150 executes a program stored in the storage device. 2 may be executed by hardware provided in the transceiver 150. In this case, the determination unit 81 illustrated in FIG. 1 is realized by a circuit disposed in the transceiver 150.

  In step S <b> 100, the transmission unit 10 transmits a training signal including predetermined data via the transmission antenna 20 based on an instruction from the control unit 80 in the training period. In addition, the transmission unit 10 outputs the training signal to the replica generation unit 15.

  In step S110, the replica generation unit 15 generates a replica signal of the transmission signal using the transmission signal (training signal) received from the transmission unit 10. That is, the replica generation unit 15 uses the transmission signal received from the transmission unit 10 as a replica signal of the transmission signal, and outputs the replica signal of the transmission signal to the feedback unit 70.

  In step S120, the feedback unit 70 performs the same reception process as that of the reception unit 40 on the replica signal of the transmission signal generated in step S110, and generates a feedback signal (that is, a replica signal of the wraparound self-interference signal). .

  In step S <b> 130, the control unit 80 uses the received signal received by the receiving unit 40 to detect the time at which the wraparound self-interference signal that the transmission signal wraps through the receiving antenna 30 arrives.

  In step S140, the control unit 80 compares the feedback signal generated in step S130 with the wraparound self-interference signal included in the received signal received from the reception unit 40, and compares the relative between the feedback signal and the wraparound self-interference signal. Difference information indicating a difference between a typical amplitude and phase is obtained. And the control part 80 controls the replica production | generation part 15 using the time detected by step S130, and the calculated | required difference information.

  In step S150, the cancel unit 90 uses the feedback signal generated in step S120 as a replica signal of the wraparound self-interference signal, and removes the wraparound self-interference signal included in the received signal.

  In step S160, the determination unit 81 measures the power of the received signal from which the wraparound self-interference signal has been removed in step S150 as a residual error.

  In step S170, the determination unit 81 determines whether or not the residual error value measured in step S160 is equal to or less than a training period threshold value. The determination unit 81 determines that the wraparound self-interference signal has been removed from the received signal when the measured residual error value is equal to or less than the training period threshold value. Then, the control unit 80 stores in the storage device of the transceiver 150 the time when the wraparound self-interference signal arrives and the propagation time and difference information obtained from the time of arrival. In this case, the processing of the transceiver 150 ends the training period (that is, the processing shown in FIG. 2) and moves to normal operation.

  On the other hand, when the residual error value is larger than the training period threshold value, the determination unit 81 determines that the wraparound self-interference signal is not sufficiently removed from the received signal. Then, the control unit 80 adjusts the time at which the wraparound self-interference signal arrives by executing an optimization algorithm such as an LMS algorithm so that the residual error value is minimized. In this case, the processing of the transceiver 150 proceeds to step S100.

  As described above, in the embodiment shown in FIGS. 1 and 2, the feedback unit 70 performs the same reception processing as that performed on the reception signal received by the reception unit 40 from the replica signal of the transmission signal received from the replica generation unit 15. To generate a feedback signal (that is, a replica signal of the self-interference signal). As a result, the transmitter / receiver 150 can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations in the transceiver 150 when there is randomness. The transceiver 150 can improve the performance of removing the sneaking self-interference signal.

  FIG. 3 shows another embodiment of a transceiver. The same or similar elements as those described in FIG. 1 are denoted by the same or similar reference numerals, and detailed description thereof will be omitted.

  The transceiver 150A illustrated in FIG. 3 includes a transmission unit 10, a replica generation unit 15a, a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70, a control unit 80a, and a cancellation unit 90a.

  Similarly to the replica generation unit 15 illustrated in FIG. 1, the replica generation unit 15 a uses the transmission signal received from the transmission unit 10 as a replica signal of the transmission signal. The replica generation unit 15a outputs a replica signal of the transmission signal to the feedback unit 70. Further, the replica generation unit 15a uses the difference information held in the storage device of the transceiver 150 at the time when the instruction is received from the control unit 80a (that is, the time when the wraparound self-interference signal arrives). 10 generates a replica signal of the sneaking self-interference signal from the transmission signal received from 10. The replica generation unit 15a outputs the generated replica signal of the wraparound self-interference signal to the cancellation unit 90a.

  The control unit 80a is a processor or the like, and controls each element of the transceiver 150A by executing a program stored in a storage device such as a memory included in the transceiver 150A. Further, the control unit 80a operates as the determination unit 81 by executing a program.

  For example, similarly to the control unit 80 shown in FIG. 1, the control unit 80 a uses the received signal received from the receiving unit 40 to detect the time when the wraparound self-interference signal arrives via the receiving antenna 30. Then, for example, the control unit 80a obtains the transmission signal propagation time from when the transmission unit 10 transmits the transmission signal until the reception unit 40 receives the self-interference signal. When detecting the time when the wraparound self-interference signal arrives, the control unit 80a temporarily stops the operation of the cancel unit 90a (that is, passes the received signal received through the receiving antenna 30 as it is). Is preferred. And the control part 80a restarts the operation | movement of the cancellation part 90a, after detecting the time when the wraparound self-interference signal arrived.

  Further, in relation to the arrangement of the transmission antenna 20 and the reception antenna 30, the distance between the transmission antenna 20 and the reception antenna 30 and the surrounding environment (such as the shape and material of walls, ceilings, floors, and casings as surrounding reflectors) ) From the information known at the time of the training start), the arrival time of the wraparound self-interference signal and the amount of change in the amplitude and phase are predicted, and the control unit 80a instructs the replica generation unit 15a based on the predicted values to perform training. The cancel unit 90a may be operated from the start time.

  Further, like the control unit 80 shown in FIG. 1, the control unit 80 a compares the feedback signal generated by the feedback unit 70 with the wraparound self-interference signal included in the reception signal received from the reception unit 40. The control unit 80a obtains difference information indicating a relative amplitude and phase difference between the feedback signal and the wraparound self-interference signal. Then, the control unit 80a controls the replica generation unit 15a using the obtained difference information and the detected time. For example, the control unit 80a changes the amplitude and phase of the transmission signal received from the transmission unit 10 using the difference information with respect to the replica generation unit 15a at the timing of the arrival of the wraparound self-interference signal obtained from the propagation time. And an analog replica signal of the transmission signal is generated. Then, the replica generation unit 15a outputs a replica signal of the generated transmission signal to the feedback unit 70. Thereby, the feedback unit 70 can generate a feedback signal that shows the same time variation as the reception signal output from the reception unit 40.

  In addition, the control unit 80a uses the difference information to transmit to the replica generation unit 15a at the time of arrival of the wraparound self-interference signal obtained from the propagation time (that is, the timing received from the control unit 80a). The amplitude and the phase of the transmission signal from 10 are changed, and an analog replica signal of the wraparound self-interference signal is generated.

  The cancel unit 90a removes the wraparound self-interference signal included in the received signal using the replica signal of the wraparound self-interference signal generated by the replica generation unit 15a. For example, the canceling unit 90a combines the replica signal of the wraparound self-interference signal with the reception signal received via the reception antenna 30 in the opposite phase, and removes the wraparound self-interference signal included in the reception signal. Then, the cancel unit 90a outputs the reception signal from which the wraparound self-interference signal is removed to the reception unit 40.

  Note that, since the received signal includes a sneaking self-interference signal, the power of the received signal may exceed the allowable power level in the LNA 41, the AGC 43, or the like of the receiving unit 40. Therefore, as shown in FIG. 3, in the transceiver 150 </ b> A, the cancel unit 90 a is disposed between the reception antenna 30 and the reception unit 40. As a result, the cancel unit 90a removes the sneaking self-interference signal from the reception signal in front of the reception unit 40, so that the power of the reception signal can be suppressed within an allowable level such as the LNA 41 of the reception unit 40.

  Further, when the power of the received signal is within the allowable level of the LNA 41 of the receiving unit 40, the cancel unit 90a can be installed after the output of the LNA 41 of the receiving unit 40. In this case, the LNA 41 of the feedback unit 70 is omitted, and the amplitude and phase changes due to the LNA 41 of the feedback unit 70 are added to the amplitude and phase changes in the replica generation unit 15a, and the wraparound after the output of the LNA 41 of the reception unit 40 is performed. You may generate | occur | produce as a replica signal of a self-interference signal.

  FIG. 4 shows an example of transmission / reception processing in the transceiver 150A shown in FIG. The processing illustrated in FIG. 4 is realized, for example, when a control unit 80a such as a processor included in the transceiver 150A executes a program stored in the storage device. Note that the processing illustrated in FIG. 4 may be executed by hardware provided in the transceiver 150A. In this case, the determination unit 81 shown in FIG. 3 is realized by a circuit arranged in the transceiver 150A.

  Note that among the operations of the steps shown in FIG. 4, those showing the same or similar processing as the steps shown in FIG. 2 are denoted by the same step numbers, and detailed description thereof is omitted.

  The transceiver 150A executes the processing of step S145 after executing the processing of step S100 to step S140 shown in FIG.

  In step S145, the replica generation unit 15a performs transmission from the transmission unit 10 using the difference information at the timing of the arrival of the wraparound self-interference signal obtained from the propagation time (that is, the timing received from the control unit 80a). A replica signal of the self-interference signal is generated by changing the amplitude and phase of the signal. The replica generation unit 15a outputs the generated replica signal of the wraparound self-interference signal to the cancellation unit 90a.

  In step S155, the cancel unit 90a removes the wraparound self-interference signal included in the received signal using the replica signal of the wraparound self-interference signal generated in step S145.

  The transmitter / receiver 150A executes the processing of step S155, and then executes the processing of step S160 and step S170.

  As described above, in the embodiment illustrated in FIGS. 3 and 4, the feedback unit 70 performs the same reception processing as the reception signal received by the reception unit 40 on the replica of the transmission signal received from the replica generation unit 15 a. Run on the signal to generate a feedback signal. The control unit 80a compares the feedback signal and the wraparound self-interference signal included in the reception signal received from the reception unit 40, and obtains difference information between the feedback signal and the wraparound self-interference signal. And the replica production | generation part 15a changes the amplitude and phase of the transmission signal received from the transmission part 10 using the difference information received from the control part 80a, and produces | generates the replica signal of a wraparound self-interference signal.

  Thereby, the transmitter / receiver 150A can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations in the transceiver 150A when there is randomness. The transceiver 150A can improve the performance of removing the self-interference signal.

  In addition, the cancel unit 90a is disposed between the reception antenna 30 and the reception unit 40 and removes the sneaking self-interference signal from the reception signal in front of the reception unit 40, whereby the power of the reception signal is reduced to the LNA 41 of the reception unit 40, etc. Can be kept within an acceptable level of power.

  FIG. 5 shows another embodiment of a transceiver. The same or similar elements as those described in FIG. 1 are denoted by the same or similar reference numerals, and detailed description thereof will be omitted.

  The transceiver 150B illustrated in FIG. 5 includes a transmission unit 10, replica generation units 15, 35 (1) -35 (N), a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70, a control unit 80b, It has a canceling unit 90b and a residual component removing unit 100 (N is an integer of 1 or more).

  Each of the replica generation units 35 (35 (1) -35 (N)) has a difference at each of N different arrival times of the wraparound self-interference signal detected by the control unit 80b due to a delay in propagation or the like. Using the information, a replica signal of the self-interference signal is generated from the transmission signal received from the transmission unit 10. Each replica generation unit 35 outputs the generated replica signal of each wraparound self-interference signal to the cancellation unit 90b.

  The control unit 80b is a processor or the like, and controls each element of the transceiver 150B by executing a program stored in a storage device such as a memory included in the transceiver 150B. In addition, the control unit 80b operates as the determination unit 81 by executing a program.

  For example, similarly to the control unit 80 shown in FIG. 1, the control unit 80 b uses the received signal received from the receiving unit 40 to detect the time when the wraparound self-interference signal arrives via the receiving antenna 30. Note that the wraparound self-interference signal is received via the receiving antenna 30 at a plurality of different times when affected by a delay or the like in propagation. In this case, the control unit 80b detects, for example, N arrival times. And the control part 80b calculates | requires the propagation time after the transmission part 10 transmits a transmission signal until the receiving part 40 wraps around and receives an own interference signal, respectively.

  When detecting the time when the wraparound self-interference signal arrives, the control unit 80b temporarily stops the operation of the cancel unit 90b (that is, passes the received signal received through the receiving antenna 30 as it is). Is preferred. And the control part 80b restarts the operation | movement of the cancellation part 90b, after detecting the time when the wraparound self-interference signal arrived.

  Further, in relation to the arrangement of the transmission antenna 20 and the reception antenna 30, the distance between the transmission antenna 20 and the reception antenna 30 and the surrounding environment (such as the shape and material of walls, ceilings, floors, and casings as surrounding reflectors) ), The arrival time of the sneak self-interference signal and the amount of change in the amplitude and phase are predicted from the information known at the start of training, and the control unit 80b uses the predicted values to generate the replica generation unit 35 (1) -35. (N) may be instructed, and the cancel unit 90b may be operated from the training start time.

  Further, when a plurality of arrival times are detected due to the influence of delay or the like, the number of arrival times to be detected may be less than N, and may be terminated when there are more. And the replica production | generation part 35 (1) -35 (N) should just operate | move according to the number of the detected arrival times. Further, it is not necessary to generate replica signals of all N wraparound self-interference signals in the first training, and it may be updated at the time of a plurality of trainings and operations after training. That is, a replica signal is generated by adding an incoming wave of the detected wraparound self-interference signal from the received signal after cancellation using a replica signal of the wraparound self-interference signal detected and generated by one training. Also good.

  And the control part 80b compares the feedback signal which the feedback part 70 produced | generated with the self-interference signal contained in the received signal received from the receiving part 40 similarly to the control part 80 shown in FIG. Note that the wraparound self-interference signal to be compared with the feedback signal is, for example, a wraparound self-interference signal having the earliest arrival time (that is, received without delay). The control unit 80b obtains difference information indicating a relative amplitude and phase difference between the feedback signal and the wraparound self-interference signal. Then, the control unit 80b controls the replica generation unit 15 using the obtained difference information and the detected time. Thereby, the feedback unit 70 can generate a feedback signal that shows the same time variation as the reception signal output from the reception unit 40.

  Further, the control unit 80b controls each replica generation unit 35 using the obtained difference information and the detected N times. For example, the control unit 80b transmits the amplitude of the transmission signal from the transmission unit 10 to each replica generation unit 35 using the difference information at each timing when the wraparound self-interference signal obtained from each propagation time arrives. The phase is changed to generate an analog replica signal of the wraparound self-interference signal.

  The cancel unit 90b removes the wraparound self-interference signal included in the received signal using the replica signal of each wraparound self-interference signal generated by each replica generation unit 35. For example, the cancel unit 90b synthesizes the replica signal of the wraparound self-interference signal from each replica generation unit 35 with the reception signal received via the reception antenna 30 in the opposite phase, and the wraparound self-interference signal included in the reception signal. Remove. Then, the cancel unit 90b outputs the reception signal from which the wraparound self-interference signal is removed to the reception unit 40.

  Note that, since the received signal includes a sneaking self-interference signal, the power of the received signal may exceed the allowable power level in the LNA 41, the AGC 43, or the like of the receiving unit 40. Therefore, as shown in FIG. 5, in the transceiver 150 </ b> B, the cancel unit 90 b is disposed between the reception antenna 30 and the reception unit 40. As a result, the cancel unit 90b removes the sneaking self-interference signal from the reception signal in front of the reception unit 40, so that the power of the reception signal can be suppressed within an allowable level such as the LNA 41 of the reception unit 40.

  The residual component removing unit 100 removes the residual component of the wraparound self-interference signal remaining in the reception signal received from the reception unit 40 using the replica signal of the residual component of the wraparound self-interference signal received from the feedback unit 70. That is, the wraparound self-interference signal included in the received signal is subjected to distortion, delay, and the like in propagation, and therefore remains as a residual component without being removed by the cancel unit 90b. Therefore, for example, the control unit 80b adjusts the arrival time, amplitude, and phase of the wraparound self-interference signal in the difference information, and causes the replica generation unit 15 to generate a replica signal of the adjusted transmission signal. The feedback unit 70 performs reception processing on the replica signal of the transmission signal adjusted by the replica generation unit 15 at the time when the residual component of the wraparound self-interference signal arrives, and determines the residual component of the wraparound self-interference signal. A feedback signal is generated. The feedback unit 70 wraps around the generated feedback signal and outputs it to the residual component removal unit 100 as a replica signal of the residual component of the self-interference signal.

  The residual component removing unit 100 removes the residual component of the wraparound self-interference signal remaining in the reception signal received from the reception unit 40 using the replica signal of the residual component of the wraparound self-interference signal received from the feedback unit 70. For example, the residual component removal unit 100 synthesizes a replica signal of the residual component of the wraparound self-interference signal with the reception signal received from the reception unit 40 in reverse phase, and removes the residual component of the wraparound self-interference signal included in the reception signal. To do.

  FIG. 6 shows an example of transmission / reception processing in the transceiver 150B shown in FIG. The processing illustrated in FIG. 6 is realized, for example, when a control unit 80b such as a processor included in the transceiver 150B executes a program stored in the storage device. Note that the processing illustrated in FIG. 6 may be executed by hardware provided in the transceiver 150B. In this case, the determination unit 81 shown in FIG. 5 is realized by a circuit arranged in the transceiver 150B.

  Note that among the operations of the steps shown in FIG. 6, those showing the same or similar processing as the steps shown in FIG. 2 are denoted by the same step numbers, and detailed description thereof is omitted.

  The transceiver 150B executes the processing of step S145a after executing the processing of step S100 to step S140 shown in FIG.

  In step S145a, each replica generation unit 35 uses the difference information at the timing of the arrival of the wraparound self-interference signal obtained from each propagation time (that is, the timing received from the control unit 80a at a different time). The amplitude and phase of the transmission signal from the transmission unit 10 are changed to generate a replica signal of the wraparound self-interference signal. Each replica generation unit 35 outputs the generated replica signal of each wraparound self-interference signal to the cancellation unit 90b.

  In step S155a, the cancel unit 90b removes the wraparound self-interference signal included in the received signal using the replica signal of the wraparound self-interference signal generated by each replica generation unit 35 in step S145a.

  In step S156, the control unit 80b adjusts the arrival time, amplitude, and phase of the wraparound self-interference signal in the difference information, and uses the adjusted difference information to return to the replica generation unit 15 and the feedback unit 70, where the wraparound self-interference signal remains. A component replica signal is generated. That is, the replica generation unit 15 generates a replica signal of the transmission signal whose amplitude and phase are adjusted using the adjusted difference information. The feedback unit 70 performs reception processing on the replica signal of the transmission signal adjusted by the replica generation unit 15 at the time when the residual component of the wraparound self-interference signal arrives, and determines the residual component of the wraparound self-interference signal. A feedback signal is generated. Then, the feedback unit 70 wraps around the generated feedback signal and outputs it to the residual component removal unit 100 as a replica signal of the residual component of the self-interference signal.

  In step S157, the residual component removal unit 100 uses the replica signal of the residual component of the wraparound self-interference signal generated in step S156 to obtain the residual component of the wraparound self-interference signal included in the received signal received from the reception unit 40. Remove.

  The transceiver 150B executes the processing of step S157, and then executes the processing of step S160 and step S170.

  As described above, in the embodiment illustrated in FIGS. 5 and 6, the feedback unit 70 performs the same reception processing as the reception signal received by the reception unit 40 from the replica generation unit 15. To generate a feedback signal. The control unit 80b detects a plurality of times when the wraparound self-interference signal arrives due to a delay or the like from the comparison between the feedback signal and the wraparound self-interference signal included in the received signal received from the reception unit 40, and also detects the feedback signal and The difference information between the interference signals is obtained. Then, the control unit 80b changes the amplitude and phase of the transmission signal received from the transmission unit 10 to each of the replica generation units 35 using the obtained difference information at the timing of each detected time, and the wraparound self-interference signal The replica signal is generated.

  Thus, the transceiver 150B can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations when there is randomness in the transceiver 150B. The transceiver 150B can improve the performance of removing the self-interference signal.

  Further, the control unit 80b adjusts the arrival time, amplitude, and phase of the wraparound self-interference signal in the difference information, and uses the adjusted difference information to the replica generation unit 15 and the feedback unit 70 to determine the residual component of the wraparound self-interference signal. A replica signal is generated. Then, the residual component removal unit 100 removes the residual component of the wraparound self-interference signal included in the received signal received from the reception unit 40, using the generated replica signal of the residual component of the wraparound self-interference signal. Thereby, the transceiver 150B can remove the received wraparound self-interference signal from the received signal with high accuracy.

  In addition, the cancel unit 90b is disposed between the reception antenna 30 and the reception unit 40, and removes the sneaking self-interference signal from the reception signal in front of the reception unit 40, whereby the power of the reception signal is reduced to the LNA 41 of the reception unit 40. The power level can be kept within the allowable level.

  FIG. 7 shows another embodiment of a transceiver. The same or similar elements as those described in FIG. 1 are denoted by the same or similar reference numerals, and detailed description thereof will be omitted.

  The transceiver 150C illustrated in FIG. 7 includes a transmission unit 10, a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70, a control unit 80c, a cancellation unit 90, and a time variation component extraction unit 110.

  The control unit 80c is a processor or the like, and controls each element of the transceiver 150C by executing a program stored in a storage device such as a memory included in the transceiver 150C. Further, the control unit 80c operates as the determination unit 81 and the replica generation unit 82 by executing the program.

  The replica generation unit 82 receives a digital transmission signal including data. In addition, the replica generation unit 82 acquires the time variation component of the amplitude and phase of the transmission signal extracted by the time variation component extraction unit 110 described later (that is, the LO signal of the local oscillator 50, the clock signal of the clock generator 60, and the like). To do. The replica generation unit 82 changes the amplitude and phase of the digital transmission signal received using the acquired time-varying component, and the replica signal of the transmission signal subjected to pseudo processing of the DAC 11 and the mixer 12 of the transmission unit 10 Is generated. The replica generation unit 82 outputs a replica signal of the generated transmission signal to the feedback unit 70 via a DAC or the like included in the control unit 80c. Thereby, the feedback unit 70 can generate a feedback signal.

  Similarly to the control unit 80 shown in FIG. 1, the control unit 80 c uses the received signal received from the receiving unit 40 to detect the time when the wraparound self-interference signal arrives via the receiving antenna 30. Then, for example, the control unit 80c obtains the propagation time of the transmission signal from when the transmission unit 10 transmits the transmission signal until the reception unit 40 receives the self-interference signal.

  Further, like the control unit 80 shown in FIG. 1, the control unit 80 c compares the feedback signal generated by the feedback unit 70 with the wraparound self-interference signal included in the reception signal received from the reception unit 40. The control unit 80c obtains difference information indicating a relative amplitude and phase difference between the feedback signal and the wraparound self-interference signal. Then, the control unit 80c controls the replica generation unit 82 using the obtained difference information and the detected time. For example, the control unit 80a causes the replica generation unit 82 to change the amplitude and phase of the transmission signal using the difference information at the timing of the arrival of the wraparound self-interference signal obtained from the propagation time. Generate a signal. Then, the replica generation unit 82 outputs the replica signal of the generated transmission signal to the feedback unit 70. Thereby, the feedback unit 70 can generate a feedback signal that shows the same time variation as the reception signal output from the reception unit 40.

  The time variation component extraction unit 110 extracts time variation components such as amplitude and phase in the transmission signal transmitted by the transceiver 150C. For example, the time variation component extraction unit 110 receives the LO signal of the local oscillator 50 and the clock signal of the clock generator 60 as time variation components such as amplitude and phase in the transmission signal. Then, the time variation component extraction unit 110 samples the signals received from each of the local oscillator 50 and the clock generator 60 by using the ADC included in the time variation component extraction unit 110, and each sampled signal is controlled by the control unit 80c. Output to. The time variation component extraction unit 110 samples the LO signal of the local oscillator 50 or the phase noise of the LO signal, and extracts it as a time variation component of the amplitude or phase in the transmission signal. The time variation component extraction unit 110 samples the clock signal or clock jitter of the clock generator 60 and extracts it as a time variation component of the amplitude and phase in the transmission signal.

  FIG. 8 shows an example of transmission / reception processing in the transceiver 150C shown in FIG. The processing illustrated in FIG. 8 is realized, for example, when a control unit 80c such as a processor included in the transceiver 150C executes a program stored in the storage device. Note that the processing illustrated in FIG. 8 may be executed by hardware provided in the transceiver 150C. In this case, the determination unit 81 and the replica generation unit 82 illustrated in FIG. 7 are realized by a circuit arranged in the transceiver 150C.

  Note that among the operations of the steps shown in FIG. 8, those showing the same or similar processing as the steps shown in FIG. 2 are denoted by the same step numbers, and detailed description thereof is omitted.

  The transceiver 150C executes the process of step S105 shown in FIG. 8, and then executes the process of step S105.

  In step S105, the time variation component extraction unit 110 extracts time variation components such as amplitude and phase in the transmission signal (that is, the training signal) transmitted by the transceiver 150C. For example, the time variation component extraction unit 110 receives the LO signal of the local oscillator 50 and the clock signal of the clock generator 60 as time variation components of the amplitude and phase in the transmission signal. Then, the time variation component extraction unit 110 samples the signal received from each of the local oscillator 50 and the clock generator 60 using the ADC included in the time variation component extraction unit 110, and outputs the sampled signal to the control unit 80c.

  In step S115, the replica generation unit 82 performs time variation components of the digital transmission signal (training signal) and the amplitude and phase of the transmission signal extracted in step S105 (that is, the LO signal and clock generator 60 of the local oscillator 50). And a replica signal of the transmission signal transmitted by the transmission unit 10 is generated. Further, when the transmission signal is affected by the nonlinear characteristic of the mixer 12 or PA 13, the nonlinear characteristic may be added to the replica signal of the transmission signal by digital signal processing or the like. Moreover, the predistortion process etc. may be performed to the training signal input into the transmission part 10, and the influence of a nonlinear characteristic may be canceled.

  The transceiver 150C executes the process of step S115, and then executes the process of step S120 to step S170.

  As described above, in the embodiment shown in FIGS. 7 and 8, the replica generation unit 82 uses the time-varying component of the amplitude and phase in the transmission signal extracted by the time-varying component extraction unit 110 to replicate the digital transmission signal. Generate a signal. The feedback unit 70 performs the same reception process as that performed on the reception signal received by the reception unit 40 on the replica signal of the transmission signal generated by the replica generation unit 82, and outputs a feedback signal (that is, a wraparound). A replica signal of the self-interference signal). Thus, the transceiver 150C can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations when there is randomness in the transceiver 150C. The transceiver 150C can improve the performance of removing the self-interference signal.

  FIG. 9 shows another embodiment of a transceiver. The same or similar elements as those described in FIG. 1 are denoted by the same or similar reference numerals, and detailed description thereof will be omitted.

  The transceiver 150D illustrated in FIG. 9 includes a transmission unit 10, a replica generation unit 15, a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70a, a control unit 80d, a cancellation unit 90, and a time variation component extraction unit 110a. Have

  The feedback unit 70a includes an LNA 41, an AGC 43, and an ADC 44. That is, in the feedback unit 70a, for example, the mixer 42 of the feedback unit 70 illustrated in FIG. 1 is omitted. Then, the feedback unit 70a performs the reception process from which the process by the mixer 42 is excluded, on the replica signal of the transmission signal received from the replica generation unit 15, and generates a feedback signal. The feedback unit 70a outputs the generated feedback signal to the control unit 80d. The feedback unit 70 a may omit the AGC 43 and the ADC 44 instead of the mixer 42.

  The time variation component extraction unit 110a extracts time variation components corresponding to the processing by the mixer 42 excluded by the feedback unit 70a from the time variation components of the received signal received by the transceiver 150D. For example, the time variation component extraction unit 110 a receives the LO signal of the local oscillator 50 as the time variation component corresponding to the processing by the mixer 42. That is, the time variation component extraction unit 110a samples the LO signal received from the local oscillator 50 using the ADC included in the time variation component extraction unit 110a, and outputs the sampled signal to the control unit 80d. That is, the time variation component extraction unit 110 a extracts the LO signal of the local oscillator 50 or the phase noise of the LO signal as a time variation component corresponding to the processing by the mixer 42. When the AGC 43 or the ADC 44 is omitted in the feedback unit 70a, the time variation component extraction unit 110 may extract the signal from the AGC 43 or the signal from the clock generator 60 as the time variation component.

  The control unit 80d is a processor or the like, and controls each element of the transceiver 150D by executing a program stored in a storage device such as a memory included in the transceiver 150D. Similarly to the control unit 80 shown in FIG. 1, the control unit 80 d detects the time when the sneaking self-interference signal arrives via the reception antenna 30 using the reception signal received from the reception unit 40. Furthermore, the control unit 80d operates as the determination unit 81 and the replica generation unit 82a by executing the program.

  The replica generation unit 82a detects the feedback signal generated by the feedback unit 70a and the time variation component of the received signal extracted by the time variation component extraction unit 110a (that is, the LO signal or phase noise of the local oscillator 50). The replica signal of the wraparound self-interference signal is generated using the determined time. For example, the replica generation unit 82a changes the amplitude and phase of the feedback signal received from the feedback unit 70a by calculation or the like using the time-varying component of the extracted LO signal of the local oscillator 50 at the timing of the detected time. To generate a reference signal. That is, the replica generation unit 82a artificially adds a time variation due to the excluded mixer 42 to the feedback signal.

    As shown in FIG. 9, since the mixer 42 is omitted from the feedback unit 70a, the frequency of the signal input to the ADC 44 is the RF band. Therefore, the ADC 44 of the feedback unit 70a targets a low-frequency signal after down-conversion, and performs sampling at a low rate. Therefore, the feedback signal is down-converted to a low frequency band due to the effect of undersampling. The replica generation unit 82a performs a band-pass filter process on the down-converted feedback signal because it may be converted to a frequency different from that of the original training signal due to undersampling, or an unnecessary wave may exist outside the signal band. Then, the component of the wraparound self-interference signal is extracted by further performing frequency conversion processing as necessary. Note that the difference between the center frequency of the signal after undersampling and the training signal is determined by the relationship between the center frequency of the training signal and the sampling rate of the ADC 44.

  The replica generation unit 82a compares the generated reference signal with the wraparound self-interference signal included in the reception signal received from the reception unit 40, and compares the relative amplitude and phase between the reference signal and the wraparound self-interference signal. Is obtained. And the replica production | generation part 82a changes the amplitude and phase of a reference signal using the calculated | required difference information, and produces | generates the replica signal of a wraparound self-interference signal. The replica generation unit 82a outputs the generated replica signal of the wraparound self-interference signal to the cancellation unit 90.

  FIG. 10 shows an example of transmission / reception processing in the transceiver 150D shown in FIG. The processing illustrated in FIG. 10 is realized, for example, when a control unit 80d such as a processor included in the transceiver 150D executes a program stored in the storage device. Note that the processing illustrated in FIG. 10 may be executed by hardware provided in the transceiver 150D. In this case, the determination unit 81 and the replica generation unit 82a illustrated in FIG. 9 are realized by a circuit arranged in the transceiver 150D.

  Note that among the operations of the steps shown in FIG. 10, those showing the same or similar processing as the steps shown in FIG. 8 are given the same step numbers, and detailed descriptions thereof are omitted.

  The transceiver 150D executes the processing of step S135 after executing the processing of step S100 to step S130 shown in FIG.

  In step S135, the replica generation unit 82a generates a reference signal by changing the amplitude and phase of the feedback signal using the time variation component extracted by the time variation component extraction unit 110a at the timing of the time detected in step S130. To do.

  In step S140b, the replica generation unit 82a compares the reference signal generated in step S135 with the wraparound self-interference signal included in the reception signal received from the reception unit 40, and determines between the reference signal and the wraparound self-interference signal. Find difference information.

  In step S145b, the replica generation unit 82a generates the replica signal of the wraparound self-interference signal by changing the amplitude and phase of the reference signal using the difference information at the time of arrival of the wraparound self-interference signal obtained from the propagation time. To do. The replica generation unit 82a outputs the generated replica signal of the wraparound self-interference signal to the cancellation unit 90.

  The transceiver 150D executes the process of step S145b and then executes the process of step S150 to step S170.

  As described above, in the embodiment shown in FIG. 9 and FIG. 10, the replica generation unit 82a is extracted by the feedback signal generated by the feedback unit 70a and the time variation component extraction unit 110a (that is, excluded from the feedback unit 70a). A replica signal of the wraparound self-interference signal is generated using the time-varying component. In other words, the replica generation unit 82a corrects the feedback signal using the time variation component extracted by the time variation component extraction unit 110a for the reception process excluded by the feedback unit 70a, and the replica signal of the wraparound self-interference signal Is generated. Thus, the transceiver 150D can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations in the transceiver 150D when there is randomness. And transceiver 150D can aim at the improvement of the performance which removes a roundabout self-interference signal.

  FIG. 11 shows another embodiment of a transceiver. Elements that are the same as or similar to the elements described in FIG. 10 are assigned the same or similar reference numerals, and detailed descriptions thereof are omitted.

  The transceiver 150E shown in FIG. 11 includes a transmission unit 10, a replica generation unit 15, a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70b, a control unit 80d, a cancellation unit 90, and a time variation component extraction unit 110b. Have

  The feedback unit 70 b includes an LNA 41, a mixer 42, and an ADC 44. That is, in the feedback unit 70b, for example, the AGC 43 of the feedback unit 70 illustrated in FIG. 1 is omitted. Then, the feedback unit 70b performs the reception process from which the process by the AGC 43 is excluded, on the replica signal of the transmission signal received from the replica generation unit 15, and generates a feedback signal. The feedback unit 70b outputs the generated feedback signal to the control unit 80d.

  The time variation component extraction unit 110b extracts time variation components corresponding to the processing by the AGC 43 excluded by the feedback unit 70b from the time variation components of the reception signal received by the transceiver 150E. For example, the time variation component extraction unit 110a receives a signal including gain information indicating the content of gain control performed on the received signal by the AGC 43 as a time variation component corresponding to the processing by the AGC 43. Then, the time variation component extraction unit 110b samples the gain information signal received from the AGC 43 using the ADC included in the time variation component extraction unit 110b, and outputs the sampled gain information to the control unit 80d. That is, the time variation component extraction unit 110b extracts the gain information of the AGC 43 as the time variation component of the amplitude in the received signal.

  Note that the transmission / reception processing in the transceiver 150E shown in FIG. 11 is the same as or similar to the processing shown in FIG. 10, and detailed description thereof is omitted.

  As described above, in the embodiment illustrated in FIG. 11, the replica generation unit 82a receives the feedback signal generated by the feedback unit 70b and the reception processing extracted by the time variation component extraction unit 110b (that is, excluded by the feedback unit 70b). A replica signal of the self-interference signal is generated using the time-varying component. In other words, the replica generation unit 82a corrects the feedback signal using the time variation component extracted by the time variation component extraction unit 110b for the reception process excluded by the feedback unit 70b, and the replica signal of the wraparound self-interference signal. Is generated. Accordingly, the transceiver 150E can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations in the transceiver 150E when there is randomness. Then, the transceiver 150E can improve the performance of removing the wraparound self-interference signal.

  FIG. 12 shows another embodiment of a transceiver. Elements that are the same as or similar to the elements described in FIG. 10 are assigned the same or similar reference numerals, and detailed descriptions thereof are omitted.

  The transceiver 150F illustrated in FIG. 12 includes a transmission unit 10, a replica generation unit 15, a reception unit 40, local oscillators 50a and 50b, a clock generator 60, a feedback unit 70, a control unit 80e, a cancellation unit 90, and a time-varying component extraction. Part 110c.

  The local oscillators 50a and 50b are oscillators such as a VCO, and generate an LO signal having a predetermined frequency by controlling an oscillation frequency according to an applied voltage. The local oscillator 50a outputs the generated LO signal to each of the mixer 12 of the transmission unit 10, the mixer 42 of the reception unit 40, and the time variation component extraction unit 110c. The local oscillator 50b outputs the generated LO signal to each of the mixer 42 and the time variation component extraction unit 110c of the feedback unit 70. Note that the LO signals of the local oscillators 50a and 50b may be set to the same frequency or different frequencies.

  For example, when the frequencies of the LO signals of the local oscillators 50a and 50b are set to the same frequency, the reception unit 40 and the feedback unit 70 execute the same reception process. However, when the LO signals between the local oscillators 50a and 50b are not synchronized with each other, a difference in time variation of reception processing occurs between the reception unit 40 and the feedback unit 70. On the other hand, when the frequencies of the LO signals of the local oscillators 50a and 50b are set to different frequencies, the receiving unit 40 and the feedback unit 70 execute different processes in the mixer 42. Therefore, the time variation component extraction unit 110c receives the LO signal or phase noise from the local oscillators 50a and 50b, and extracts the difference in reception processing between the reception unit 40 and the feedback unit 70 as a time variation component. When the LO signals of local oscillators 50a and 50b have the same frequency, mixer 12 of transmission / reception 10 or mixer 42 of reception unit 40 may receive the LO signal of local oscillator 50b.

  The transceiver 150F is provided with the two local oscillators 50a and 50b, but may be provided with two clock generators 60. That is, one clock generator 60 supplies a clock signal to the DAC 11 of the transmission unit 10 and the ADC 44 of the reception unit 40. The other clock generator 60 supplies a clock signal to the ADC 44 of the feedback unit 70. In this case, the time variation component extraction unit 110 c receives the clock signal or clock jitter of the two clock generators 60, and calculates the difference in time variation between the two clock generators 60 in the reception unit 40 and the feedback unit 70. Extracted as a difference in reception processing (ie, time-varying component). Note that the frequency of the clock signal of the two clock generators 60 may be the same or different. As an example when the frequencies of the clock signals are different, the mixer 42 as shown in FIG. 9 may be omitted, and a feedback signal sampled at a high rate by the ADC 44 as an RF band signal may be input to the control unit 80e. In this case, the replica generation unit 82b adjusts the frequency of the feedback signal to the frequency of the reception signal received by the reception unit 40, for example, by digitally downconverting the frequency of the feedback signal.

  Further, the AGC 43 of the receiving unit 40 and the feedback unit 70 may be operated independently. In this case, the time variation component extraction unit 110c receives a signal including the gain information of each AGC 43, and determines the difference in time variation between the two AGCs 43 in the reception processing difference between the reception unit 40 and the feedback unit 70 (that is, Extracted as time-varying component).

  The control unit 80e is a processor or the like, and controls each element of the transceiver 150F by executing a program stored in a storage device such as a memory included in the transceiver 150F. Similarly to the control unit 80 shown in FIG. 1, the control unit 80 e uses the received signal received from the receiving unit 40 to detect the time when the wraparound self-interference signal arrives via the receiving antenna 30. Furthermore, the control unit 80e operates as the determination unit 81 and the replica generation unit 82b by executing the program.

  The replica generation unit 82b includes the feedback signal generated by the feedback unit 70 and the time variation component of the reception signal extracted by the time variation component extraction unit 110c (that is, the LO signal or the LO signal of each of the local oscillators 50a and 50b). A replica signal of the wraparound self-interference signal is generated using the phase noise) and the detected time. For example, when the LO signals of the local oscillators 50a and 50b have the same frequency, the replica generation unit 82b detects the phase difference (that is, the time difference) between the LO signals of the local oscillators 50a and 50b at the timing of the detected time. . Then, the replica generation unit 82b generates a reference signal by changing the amplitude and phase of the feedback signal by four arithmetic operations using the detected phase difference and the extracted time-varying components of the LO signals of the local oscillators 50a and 50b. To do.

  On the other hand, when the frequencies of the LO signals of the local oscillators 50a and 50b are different from each other, the replica generation unit 82b adjusts the frequency of the feedback signal to the frequency of the reception signal received by the reception unit 40, for example, by digitally downconverting the frequency of the feedback signal. . Then, the replica generation unit 82b generates a reference signal by changing the amplitude and phase of the feedback signal by calculation or the like using the extracted time-varying components of the LO signals of the local oscillators 50a and 50b.

  The replica generation unit 82b compares the generated reference signal with the wraparound self-interference signal included in the reception signal received from the reception unit 40, and compares the relative amplitude and phase between the reference signal and the wraparound self-interference signal. Is obtained. And the replica production | generation part 82b changes the amplitude and phase of a reference signal using the calculated | required difference information, and produces | generates the replica signal of a wraparound self-interference signal. The replica generation unit 82b outputs the generated replica signal of the wraparound self-interference signal to the cancellation unit 90.

  Note that the transmission / reception processing in the transmitter / receiver 150F shown in FIG. 12 is the same as or similar to the processing shown in FIG.

  As described above, in the embodiment illustrated in FIG. 12, the replica generation unit 82 b performs the reception process in the reception unit 40 and the feedback unit 70 extracted by the feedback signal generated by the feedback unit 70 and the time variation component extraction unit 110 c. A replica signal of the wraparound self-interference signal is generated using the time-varying component indicating the difference. That is, the replica generation unit 82b corrects the feedback signal for the difference in reception processing between the reception unit 40 and the feedback unit 70b using the time variation component extracted by the time variation component extraction unit 110c, and Generate a replica signal. Thus, the transceiver 150F can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations in the transceiver 150F when there is randomness. The transceiver 150F can improve the performance of removing the self-interference signal.

  FIG. 13 shows another embodiment of a transceiver. The same or similar elements as those described in FIG. 7 are denoted by the same or similar reference numerals, and detailed description thereof will be omitted.

  The transceiver 150G illustrated in FIG. 13 includes a transmission unit 10, a reception unit 40, a local oscillator 50, a clock generator 60, a feedback unit 70c, a control unit 80f, a cancellation unit 90, and a time variation component extraction unit 110.

  The feedback unit 70c includes an LNA 41, an AGC 43, and an ADC 44, similar to the feedback unit 70a illustrated in FIG. That is, the mixer 42 is omitted from the feedback unit 70c. Thereby, the feedback unit 70c performs the reception process from which the process by the mixer 42 is excluded, on the replica signal of the transmission signal received from the control unit 80f, and generates a feedback signal. The feedback unit 70c outputs the generated feedback signal to the control unit 80f.

  The control unit 80f is a processor or the like, and controls each element of the transceiver 150G by executing a program stored in a storage device such as a memory included in the transceiver 150G. Similarly to the control unit 80c shown in FIG. 7, the control unit 80f uses the received signal received from the receiving unit 40 to detect the time when the sneak self-interference signal arrives via the receiving antenna 30. Furthermore, the control unit 80f operates as the determination unit 81 and the replica generation unit 82c by executing the program.

  The replica generation unit 82c receives a digital transmission signal in the same manner as the replica generation unit 82 illustrated in FIG. Further, the replica generation unit 82c acquires the time variation component of the amplitude and phase of the transmission signal extracted by the time variation component extraction unit 110 (that is, the LO signal of the local oscillator 50, the clock jitter of the clock generator 60, and the like). The replica generation unit 82c changes the amplitude and phase of the digital transmission signal received by using the acquired time-varying component, and the replica signal of the transmission signal subjected to pseudo processing of the DAC 11 and the mixer 12 of the transmission unit 10 Is generated. The replica generation unit 82c outputs a replica signal of the generated transmission signal to the feedback unit 70c via a DAC or the like included in the control unit 80f. Thereby, the feedback unit 70c can generate a feedback signal.

  In addition, the replica generation unit 82c converts the LO signal or phase noise of the local oscillator 50 extracted by the time variation component extraction unit 110 together with the feedback signal generated by the feedback unit 70c and the detected time into the time variation component of the received signal. Is used to generate a replica signal of the self-interference signal. For example, the replica generation unit 82c uses the time variation component of the LO signal of the local oscillator 50 extracted at the time of the detected time to calculate the amplitude and phase of the feedback signal received from the feedback unit 70a by the four arithmetic operations or the like. The reference signal is generated by changing. That is, the replica generation unit 82c artificially adds a time variation due to the excluded mixer 42 to the feedback signal.

  Since the mixer 42 is omitted from the feedback unit 70c, the frequency of the signal input to the ADC 44 is the RF band. Therefore, the ADC 44 of the feedback unit 70c targets a low-frequency signal after down-conversion, and performs sampling at a low rate. Therefore, the feedback signal is down-converted to a low frequency band due to the effect of undersampling. The replica generation unit 82c performs band-pass filter processing on the down-converted feedback signal because there are cases where the signal is converted to a frequency different from that of the original training signal due to undersampling, or an unnecessary wave may exist outside the signal band. Then, the component of the wraparound self-interference signal is extracted by further performing frequency conversion processing as necessary.

  The replica generation unit 82c compares the generated reference signal with the wraparound self-interference signal included in the reception signal received from the reception unit 40, and compares the relative amplitude and phase between the reference signal and the wraparound self-interference signal. Is obtained. Then, the replica generation unit 82c changes the amplitude and phase of the reference signal using the obtained difference information, and generates a replica signal of the wraparound self-interference signal. The replica generation unit 82c outputs the generated replica signal of the wraparound self-interference signal to the cancellation unit 90.

  Note that the transmission / reception processing in the transceiver 150G shown in FIG. 13 is the same as or similar to the processing shown in FIG. 10, and detailed description thereof is omitted.

  As described above, in the embodiment illustrated in FIG. 13, the replica generation unit 82 c corresponds to the reception process excluded from the feedback signal generated by the feedback unit 70 c and the feedback unit 70 c extracted by the time variation component extraction unit 110. A replica signal of the wraparound self-interference signal is generated using the time variation component. That is, the replica generation unit 82c corrects the feedback signal using the time variation component extracted by the time variation component extraction unit 110 for the reception process excluded by the feedback unit 70c, and generates a replica signal of the wraparound self-interference signal. To do. Thereby, the transceiver 150G can generate a signal for removing the wraparound self-interference signal from the received signal with high accuracy even when the wraparound self-interference signal is subject to fluctuations when there is randomness in the transceiver 150G. The transceiver 150G can improve the performance of removing the self-interference signal.

  From the above detailed description, features and advantages of the embodiments will become apparent. This is intended to cover the features and advantages of the embodiments described above without departing from the spirit and scope of the claims. Also, any improvement and modification should be readily conceivable by those having ordinary knowledge in the art. Therefore, there is no intention to limit the scope of the inventive embodiments to those described above, and appropriate modifications and equivalents included in the scope disclosed in the embodiments can be used.

DESCRIPTION OF SYMBOLS 10 ... Transmission part; 11 ... DAC; 12, 42 ... Mixer; 13 ... PA; 15, 15a, 35 (1) -35 (N), 82, 82a, 82b, 82c ... Replica generation part; 30 ... receiving antenna; 40 ... receiving unit; 41 ... LNA; 43 ... AGC; 44 ... ADC; 50, 50a, 50b ... local oscillator; 60 ... clock generator; 70, 70a, 70b, 70c ... feedback unit; 80a, 80b, 80c, 80d, 80e, 80f ... control unit; 81 ... determination unit; 90, 90a ... cancellation unit; 100 ... residual component removal unit; 110 ... time-varying component extraction unit: 150, 150A, 150B, 150C, 150D, 150E, 150F, 150G ... transceiver

Claims (6)

A transceiver that performs simultaneous transmission and reception of radio waves in the same frequency band,
A first generation unit that generates a replica signal that is a replica of the transmission signal using a transmission signal transmitted by the transceiver;
A feedback unit that executes a reception process to be performed on a reception signal received by the transceiver with respect to a replica signal of the transmission signal, and generates a feedback signal;
A detection unit for detecting, using the received signal, a time at which a wraparound self-interference signal arrived by the transmission signal of the device itself included in the received signal;
The feedback signal and the wraparound self-interference signal are compared, difference information indicating a difference in amplitude and phase between the feedback signal and the wraparound self-interference signal is obtained, and the obtained difference information and the detected time A control unit for controlling the first generation unit using
Based on the detected time, a cancellation unit that removes the wraparound self-interference signal from the received signal using the feedback signal as a replica signal of the wraparound self-interference signal;
The residual component of the wraparound self-interference signal remaining in the received signal from which the wraparound self-interference signal has been removed is compared with a threshold value, and the wraparound self-interference signal is removed from the reception signal output from the cancel unit. A transceiver for determining whether or not. The first generation unit generates the replica signal of the wraparound self-interference signal from the replica signal of the transmission signal using the difference information at a timing based on the detected time,
The transceiver according to claim 1, wherein the cancel unit removes the wraparound self-interference signal from the received signal using a replica signal of the wraparound self-interference signal generated by the first generation unit. . Using at least one second generation unit that generates the replica signal of the sneak self-interference signal from the replica signal of the transmission signal using the difference information;
The detection unit detects the time when the wraparound self-interference signal included in the reception signal has arrived according to the number of the second generation units,
The control unit causes the second generation unit to generate a replica signal of the wraparound self-interference signal at a timing based on the detected time,
2. The transceiver according to claim 1, wherein the cancel unit removes the wraparound self-interference signal from the received signal using a replica signal of the wraparound self-interference signal generated by the second generation unit. . An extraction unit for extracting a time-varying component of the transmission signal;
The transceiver according to claim 1, wherein the first generation unit generates a replica signal of the transmission signal using the extracted time variation component. A transceiver that performs simultaneous transmission and reception of radio waves in the same frequency band,
A first generation unit that generates a replica signal that is a replica of the transmission signal using a transmission signal transmitted by the transceiver;
A feedback unit that generates a feedback signal by executing, on a replica signal of the transmission signal, a process in which a part of the reception process performed on the reception signal received by the transceiver is excluded;
An extraction unit that extracts time-varying components corresponding to the excluded part of the time-varying components of the received signal received by the transceiver;
A detection unit for detecting, using the received signal, a time at which a wraparound self-interference signal arrived by the transmission signal of the device itself included in the received signal;
A second generation unit that generates a reference signal using the feedback signal, the extracted time-varying component, and the detected time;
The reference signal is compared with the wraparound self-interference signal, difference information indicating a difference in amplitude and phase between the reference signal and the wraparound self-interference signal is obtained, and the reference signal is obtained using the obtained difference information. A third generation unit that generates a replica signal that is a replica of the wraparound self-interference signal,
Based on the detected time, a cancellation unit that removes the wraparound self-interference signal from the received signal using a replica signal of the wraparound self-interference signal;
The residual component of the wraparound self-interference signal remaining in the received signal from which the wraparound self-interference signal has been removed is compared with a threshold value, and the wraparound self-interference signal is removed from the reception signal output from the cancel unit. A transceiver for determining whether or not. An extraction unit for extracting a time-varying component of the transmission signal;
The transceiver according to claim 5, wherein the first generation unit generates a replica signal of the transmission signal using the extracted time variation component.

Images