JP2013126087A - Receiving apparatus and receiving method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform an offset compensation between a sub spectrum replica and a received signal, and combine them so as not to generate discontinuity of phase.SOLUTION: A phase control is performed to make a phase between sub spectrums continuous at the time of combining a plurality of sub spectrums, a phase offset of a received signal to which the phase control is performed is corrected, the signal to which the phase offset compensation is performed is demodulated, the demodulated signal is remodulated to generate a transmission signal replica, a sub spectrum in a partial band removed by a transmitting apparatus is extracted from the transmission signal replica to restore a sub spectrum replica, the phase offset compensation is applied to the transmission signal replica or the sub spectrum replica, the received signal before the phase control and the phase offset compensation are performed and the sub spectrum replica that the phase offset is applied thereto are combined with each other, and the phase offset compensation is performed to the obtained received signal to demodulate.

Description

  The present invention relates to a receiving apparatus and a receiving method for receiving a signal transmitted by removing a partial band of a spectrum of a transmission signal and performing demodulation / decoding processing.

  In wireless communication and wired communication, an improvement in frequency band utilization efficiency is required as demand increases. In order to improve the utilization efficiency of the frequency band, for example, the spectrum of the transmission signal is divided into a plurality of bands (hereinafter referred to as “sub-spectrum”) and transmitted, and the transmitted sub-spectrum is received. A technique for demodulating the original modulated signal is disclosed (see Non-Patent Document 1). In this technique, unused bands are scattered on the frequency axis to reduce unused bands. Furthermore, the total occupied bandwidth of the signal is reduced by removing a part of the sub-spectrum. The technique disclosed in Non-Patent Document 1 achieves improvement in the frequency band utilization efficiency as described above.

FIG. 3 shows a configuration example of a conventional transmission apparatus.
In FIG. 3, the transmission device includes a modulation circuit 51, a transmission filter bank 52, and a D / A converter 61. The modulation circuit 51 modulates a data signal to be transmitted by a modulation method such as QPSK, and inputs the waveform-shaped modulation signal to the transmission filter bank 52.

  The transmission filter bank 52 includes a serial-parallel conversion circuit 53, an FFT (Fast Fourier Transform) circuit 54, a division circuit 55, N switches (N is an integer of 2 or more), switches 56-1 to 56-N, N The frequency shifters 57-1 to 57-N, the adder circuit 58, the IFFT (Inverse Fast Fourier Transform) circuit 59, and the parallel-serial converter circuit 60 are provided, and the modulation signal band is divided into N sub-spectrums. It is the structure which divides | segments and transmits. FIG. 5 shows an example of dividing the modulation signal band into two (N = 2).

  The serial / parallel conversion circuit 53 of the transmission filter bank 52 performs serial / parallel conversion on the modulated signal, and the FFT circuit 54 performs fast Fourier transform to convert the signal in the time domain into the signal in the frequency domain. The dividing circuit 55 multiplies the modulation signal converted into the frequency domain by a coefficient for dividing the signal band indicated by the broken line in FIG. 5A into N, and obtains N sub-spectrums shown in FIG. Generate. The frequency shifters 57-1 to 57-N distribute and arrange N sub-spectrums in a predetermined band on the frequency axis, and the adder circuit 58 adds the outputs of the frequency shifters 57-1 to 57-N. A signal distributed as shown in FIG. 5C is generated. The signal after the distributed arrangement is converted from a frequency domain signal to a time domain signal by fast inverse Fourier transform in the IFFT circuit 59, and parallel-serial converted by the parallel-serial conversion circuit 60 and output. Further, the output signal from the transmission filter bank 52 is converted into an analog signal by the D / A converter 61 and transmitted.

  At this time, for the band to be partially deleted, before inputting to the frequency shifters 57-1 to 57-N, the switches 56-1 to 56-N corresponding to the sub-spectrum to be deleted are opened (OFF). To interrupt signal transmission. As a result, no signal component is arranged in the band, and transmission is performed with a part of the spectrum removed, so that the frequency band required for transmission can be reduced.

FIG. 4 shows a configuration example of a conventional receiving apparatus.
In FIG. 4, the receiving apparatus includes an A / D converter 71, a reception filter bank 72, and a demodulation circuit 81. The reception filter bank 72 includes a serial-parallel conversion circuit 73, an FFT circuit 74, an extraction circuit 75, N frequency shifters 76-1 to 76-N, a distortion compensation circuit 77, an addition circuit 78, an IFFT circuit 79, and a parallel-serial conversion circuit. 80, and a signal obtained by synthesizing a signal whose band is divided into N into a signal before division. An example of synthesizing a signal whose band is divided into two (N = 2) is shown in FIG.

  The A / D converter 71 of the receiving apparatus converts the received signal into a digital signal and inputs the converted digital signal to the reception filter bank 72. The serial / parallel conversion circuit 73 of the reception filter bank 72 performs serial / parallel conversion on the received signal, and the FFT circuit 74 performs fast Fourier transform to convert the signal in the time domain into the reception signal in the frequency domain. The extraction circuit 75 multiplies the received signal converted into the frequency domain by a coefficient indicated by a broken line in FIG. 6A to extract N subspectrums. As shown in FIG. 6B, the frequency shifters 76-1 to 76-N return the extracted sub-spectrums to the bands before being shifted by the frequency shifters 57-1 to 57-N of the transmission apparatus. . The adder circuit 78 adds all the sub-spectrums to obtain a synthesized modulated signal shown in FIG. 6 (c). This synthesized modulation signal is converted from a frequency domain signal to a time domain signal by fast inverse Fourier transform in IFFT circuit 79, and parallel-serial conversion circuit 80 performs parallel-serial conversion and outputs the result. The demodulation circuit 81 demodulates the modulation signal output from the reception filter bank 72 and restores the data signal transmitted from the transmission device.

  At this time, the transmission signal is not received by the reception device for the band of the portion from which the spectrum is removed by the transmission device. Therefore, some compensation processing is required. For example, there may be a noise component that causes not only a transmission signal component but also a deterioration in reception characteristics in this band. Therefore, the distortion compensation circuit 77 outputs the received signal as it is in the band in which the signal is transmitted in the transmission apparatus, and performs compensation so that “0” is output in the band from which the signal is removed in the transmission apparatus. As a result, the noise component in the band from which the signal is removed in the transmission apparatus is removed, and the reception characteristics can be improved.

  As described above, between the transmission device and the reception device, the occupied band of the transmission signal is divided, and the generated sub-spectrums are distributed and transmitted at arbitrary locations on the frequency axis. Therefore, it is possible to effectively use a discontinuous free band or the like. Further, by not transmitting a part of the band of the transmission signal spectrum, the frequency bandwidth required for transmission can be reduced and the frequency utilization efficiency can be improved.

  By the way, when distortion compensation is performed by inputting “0” in the band from which the signal has been removed in the transmission apparatus, the noise component in this band is removed, but the spectrum lacks this band on the spectrum. Therefore, since the error rate when the signal is demodulated and decoded becomes high, a technique as shown in Non-Patent Document 1 can be considered as a technique for improving this.

  This method is based on a received bit string obtained by provisional demodulation decoding of a spectrum with a partial band missing, and a transmission signal replica obtained by re-encoding and re-modulating is transmitted using the same band division filter as that of the transmission device. Waveform equalization is realized by improving the error rate by decomposing into sub-spectrum replicas and adding a sub-spectrum replica corresponding to the sub-spectrum deleted in the transmission device to the received signal.

  In addition, there is a configuration in which phase synchronization is unnecessary in the demodulator circuit in the subsequent stage by performing transmission path estimation and amplitude phase correction in the frequency domain when the first spectrum synthesis, that is, a missing spectrum is output in the receiving apparatus. However, in order to estimate a transmission path in the frequency domain, it is generally necessary to periodically insert known signals such as training signals, pilot signals, and unique words into the data signal. However, insertion of these signals that do not contribute to data transmission has a side that leads to a decrease in transmission efficiency.

  Non-Patent Document 2 proposes a blind type phase compensation technique that realizes spectrum decomposition and synthesis without using these known signals. Paying attention to the overlapping (transition) frequency region that occurs during spectrum decomposition, the phase of each received sub-spectrum is set so that the phase of the overlapping (transition) frequency region of adjacent sub-spectrum is the same for the arbitrarily decomposed received signal. To be adjusted. If this technology is used, the receiving apparatus of Non-Patent Document 1 may be able to realize phase compensation without a known signal.

Masuno et al. “Proposal of waveform equalization using sub-spectrum replica in spectrum-suppressed transmission”, IEICE General Conference 2011, B-3-9, March 2011 Abe et al., "Proposal of blind type phase compensation method in band dispersion transmission and basic performance evaluation", IEICE Technical Report, vol.111, no.179, SAT2011-35, pp.105-110, August 2011

  However, although the technology of Non-Patent Document 2 can ensure the phase continuity between the reception sub-spectrums, the phase correction corrects the relative phase difference between the sub-spectrums and is necessary for the demodulation circuit at the subsequent stage. Absolute phase correction (synchronizing the carrier (reference phase) phase generated by the receiver with the phase of the received sub-spectrum) cannot be established. Therefore, when synthesizing a sub-spectrum replica and a received signal (a spectrum with some bands missing), the phase and amplitude are added in different states, and the expected waveform equalization effect cannot be obtained. was there.

  Further, the sub-spectrum replica generated in a state where the error correction effect cannot be sufficiently obtained may not necessarily be the same as the sub-spectrum replica deleted on the transmission side. That is, the continuity of the overlapping (transition) frequency region between the sub-spectrum replica and the received signal, which is the premise of the technique of Non-Patent Document 2, is not ensured. Therefore, there is a problem that the technique of Non-Patent Document 2 cannot be applied to the configuration that realizes waveform equalization by adding the sub-spectrum replica of Non-Patent Document 1 to the received signal and improves the error rate. It was. That is, there remains a problem that phase discontinuity occurs between the sub-spectrum replica deleted from the transmission side generated from the transmission signal replica due to the remaining offset from the phase of the reference signal generated in the receiving apparatus.

  It is an object of the present invention to provide a receiving apparatus and a receiving method capable of performing offset correction between a sub-spectrum replica and a received signal and performing synthesis so that phase discontinuity does not occur.

  A first invention is a receiving method in which a transmitting device divides a transmission signal into a plurality of sub-spectrums, receives a signal transmitted by removing a part of the sub-spectrum, and performs demodulation / decoding processing of the received signal. Performing phase control to make the phases between sub-spectrums continuous when synthesizing a plurality of sub-spectrums, correcting a phase offset of a phase-controlled received signal, and demodulating a phase-corrected signal Generating a transmission signal replica by remodulating the demodulated signal, extracting a sub-spectrum of a partial band removed from the transmission signal replica by the transmission device, and restoring the sub-spectrum replica; Adding a phase offset to a signal replica or sub-spectrum replica, and phase control It is, and includes a reception signal before the phase offset is corrected, and a step of synthesizing a sub spectrum replica phase offset is added, to demodulate the phase offset correction to the obtained received signal.

  In the reception method of the first invention, the amplitude of the transmission signal replica or the sub-spectrum replica is adjusted, and the average amplitude value of the reception signal obtained by combining the sub-spectrum replica and the reception signal before the phase offset is corrected is constant. The step of controlling to be.

  According to a second aspect of the present invention, there is provided a receiving method in which a transmission device divides a transmission signal into a plurality of sub-spectrums, receives a signal transmitted by removing a part of the sub-spectrum, and performs demodulation / decoding processing on the reception signal. Performing phase control to make the phases between sub-spectrums continuous when synthesizing a plurality of sub-spectrums, correcting a phase offset of a phase-controlled received signal, and demodulating a phase-corrected signal Generating a transmission signal replica by remodulating the demodulated signal, extracting a sub-spectrum of a partial band removed by the transmission device from the transmission signal replica, and restoring the sub-spectrum replica; Correcting the phase offset with respect to the received signal before being controlled and the phase offset being corrected; and Has a received signal phase offset is corrected by combining the sub-spectrum replica and a step of demodulating the resulting received signal.

  In the receiving method of the second invention, the step of adjusting the amplitude of the received signal whose phase offset is corrected and controlling the average amplitude value of the received signal obtained by synthesizing the received signal and the sub-spectrum replica to be constant. Including.

  According to a third aspect of the present invention, there is provided a receiving apparatus that divides a transmission signal into a plurality of sub-spectrums by a transmitting apparatus, receives a signal transmitted by removing a partial band thereof, and performs demodulation / decoding processing on the received signal. A first phase control means for performing phase control to make the phases between sub-spectrums continuous when combining a plurality of sub-spectrums, a phase synchronization means for correcting the phase offset of the phase-controlled received signal, and the phase offset is corrected. Demodulation means for demodulating the received signal, transmission signal replica generation means for generating a transmission signal replica by remodulating the demodulated signal, and extracting a sub-spectrum of a partial band removed from the transmission signal replica by the transmission device Sub-spectrum replica generation means for restoring the sub-spectrum replica and a transmission signal replica or sub-spectrum replica On the other hand, it was obtained by synthesizing the second phase control means for adding the phase offset, the received signal that was phase-controlled and before the phase offset was corrected, and the sub-spectrum replica to which the phase offset was added. Synthesizing / demodulating means for correcting and demodulating the phase offset of the received signal.

  In the receiving apparatus of the third invention, the synthesizing / demodulating means adjusts the amplitude of the transmission signal replica or the sub-spectrum replica, and synthesizes the received signal obtained by synthesizing the sub-spectrum replica and the received signal before the phase offset correction. In this configuration, the average amplitude value is controlled to be constant.

  In a fourth aspect of the present invention, in a receiving apparatus that divides a transmission signal into a plurality of sub-spectrums by a transmitting apparatus, receives a signal transmitted by removing a partial band thereof, and performs demodulation / decoding processing of the received signal. A first phase control means for performing phase control to make the phases between sub-spectrums continuous when combining a plurality of sub-spectrums, a phase synchronization means for correcting the phase offset of the phase-controlled received signal, and the phase offset is corrected. Demodulation means for demodulating the received signal, transmission signal replica generation means for generating a transmission signal replica by remodulating the demodulated signal, and extracting a sub-spectrum of a partial band removed from the transmission signal replica by the transmission device Sub-spectrum replica generation means for restoring the sub-spectrum replica, and before the phase offset and the phase offset are corrected A second phase control means for correcting the phase offset with respect to the received signal; a combining / demodulating means for demodulating the obtained received signal by combining the received signal with the corrected phase offset and the sub-spectrum replica; Is provided.

  In the receiving apparatus of the fourth invention, the synthesizing / demodulating means adjusts the amplitude of the received signal whose phase offset is corrected, and the average amplitude value of the received signal obtained by synthesizing the received signal and the sub-spectrum replica becomes constant. It is the structure which controls as follows.

  1st invention and 3rd invention add an offset again with respect to the transmission signal replica which performed the offset correction between a received signal and a reference signal, or the sub spectrum replica produced | generated from the said transmission signal replica, By synthesizing the sub-spectrum replica having the offset and the reception signal before offset correction, the continuity of the phases of the reception signal after the combination and the reference signal can be achieved.

  In the second and fourth aspects of the present invention, a sub-spectrum replica generated from a transmission signal replica subjected to offset correction between a reception signal and a reference signal is combined with a reception signal subjected to offset correction. Thus, the continuity of the phases of the combined received signal and the reference signal can be achieved.

It is a figure which shows the structure of Example 1 of the receiver of this invention. It is a figure which shows the structure of Example 2 of the receiver of this invention. It is a figure which shows the structural example of the conventional transmitter. It is a figure which shows the structural example of the conventional receiver. It is a figure which shows the band division | segmentation in a transmitter. It is a figure which shows the zone | band combination in a receiver.

FIG. 1 shows the configuration of Embodiment 1 of a receiving apparatus of the present invention.
In FIG. 1, the receiving apparatus according to the first embodiment includes an A / D converter 11, a first serial-parallel converter circuit 12, a first FFT circuit 13, an extraction circuit 14, a frequency shifter 15, an amplitude phase detector 16, and a first amplitude phase. Control circuit 17, adder circuit 18, first IFFT circuit 19, first parallel-serial converter circuit 20, first phase synchronization circuit 21, first demodulation circuit 22, first error correction decoding circuit 23, transmission signal replica generation circuit 24, first 2 series-parallel conversion circuit 25, second FFT circuit 26, second amplitude phase control circuit 27, division circuit 28, reception buffer 29, synthesis circuit 30, second IFFT circuit 31, second parallel / serial conversion circuit 32, second phase synchronization circuit 33, a second demodulation circuit 34, a second error correction decoding circuit 35, and a hard decision circuit 36.

  The A / D converter 11 to the first demodulation circuit 22 perform a process of restoring the data signal transmitted from the transmission device, similarly to the conventional reception device shown in FIG. The frequency shifter 15, the amplitude phase detector 16, and the first amplitude phase control circuit 17 have configurations corresponding to N sub-spectrums, but only one of them is shown here.

  The amplitude phase detector 16 and the first amplitude phase control circuit 17 pay attention to the overlapping (transition) frequency region generated at the time of spectrum decomposition using the technique of Non-Patent Document 2, and the overlapping (transition) frequency region of adjacent subspectrums. The phase is adjusted for each sub-spectrum so that the phases of the sub-spectrums are the same, and processing for generating a sub-spectrum in which the relative phase difference and amplitude difference between the sub-spectrums are corrected is performed. The adder circuit 18 adds the sub-spectrums, and at the same time, compensates by inputting “0” in order to remove noise components in the band from which the signal has been removed by the transmitter (distortion compensation shown in FIG. 4). The function of the circuit 77) is performed.

  The frequency domain signal output from the adder circuit 18 is branched and stored in the reception buffer 29, converted into a time domain signal by the first IFF circuit 19, and further passed through the first parallel-serial converter circuit 20. Input to the phase synchronization circuit 21. The first phase synchronization circuit 21 synchronizes the phase of the carrier wave phase (reference phase) and the received signal (the signal lacking a partial frequency band obtained by the synthesis). A Costas loop (spread spectrum communication system, pp. 280-282, Science and Technology Publishing Co., Ltd.) or the like is usually used as the synchronization pull-in method, but the method is not particularly limited. The phase offset amount of the received signal with respect to the reference phase obtained by the synchronization pull-in of the first phase synchronization circuit 21 is used in the subsequent stage as control information.

  The first demodulation circuit 22 and the first error correction decoding circuit 23 perform temporary demodulation of the signal whose phase synchronization is established by the first phase synchronization circuit 21, and use the obtained temporary decoding sequence to generate a transmission signal replica generation circuit At 24, a transmission signal replica is generated. The transmission signal replica generation circuit 24 includes, for example, a re-encoding circuit and a re-modulation circuit that use the same parameters as those of the transmission device, but directly generates a replica signal when soft decision is used for provisional decoding. A soft output replica may be substituted.

  The second serial / parallel conversion circuit 25 performs serial / parallel conversion on the transmission signal replica generated by the transmission signal replica generation circuit 24. The second FFT circuit 26 converts the transmission signal replica subjected to serial-parallel conversion from a time domain signal to a frequency domain signal, and inputs the signal to the second amplitude phase control circuit 27. The second amplitude phase control circuit 27 receives the phase offset value and the offset amount with respect to the reference phase from the first phase synchronization circuit 21 as control information, and adjusts the phase of the transmission signal replica based on this information. Note that the offset with respect to the reference phase is an amount obtained by reversing the offset amount added by the first phase synchronization circuit 21 from the positive and negative. That is, the offset once retracted is restored. In this way, the phase difference from the signal accumulated in the reception buffer 29 is eliminated. Further, the second amplitude phase control circuit 27 receives the amplitude adjustment value from the first amplitude phase control circuit 17 as control information, and adjusts the amplitude value of the transmission signal replica based on this information. In this case, the amplitude value of the transmission signal replica is adjusted so that the combined amplitude value of the transition frequency band common to adjacent subspectrums is constant.

  The transmission signal replica whose amplitude and phase are adjusted is input to the dividing circuit 28, and only the sub-spectrum replica corresponding to the sub-spectrum deleted by the transmitting device is divided and extracted. It should be noted that the order of the second amplitude phase control circuit 27 and the dividing circuit 28 is changed, and the sub-spectrum replica divided and extracted by the dividing circuit 28 is determined by the phase offset value input from the first phase synchronization circuit 21 and the offset amount with respect to the reference phase. The phase may be controlled, and the amplitude value may be adjusted by the amplitude adjustment value input from the first amplitude phase control circuit 17.

  The synthesizing circuit 30 adds the reception signal before offset correction accumulated in the reception buffer 29 and the sub-spectrum replica whose amplitude and phase are controlled in the frequency domain and inputs the result to the second IFFT circuit 31 to generate a new reception signal in the time domain. Is then input to the second phase synchronization circuit 33 via the second parallel-serial conversion circuit 32. Here, by adjusting the amplitude of the sub-spectrum replica by the second amplitude phase control circuit 27, the amplitude at the time of synthesizing the sub-spectrum replica and the received signal accumulated in the reception buffer 29 can be matched. The average amplitude value of the new received signal input to the second IFFT circuit 31 can be made constant.

  In the second phase synchronization circuit 33, by using the phase offset amount output from the first phase synchronization circuit 21 as the control information, the synchronization pull-in again becomes unnecessary.

  The second demodulation circuit 34 and the second error correction decoding circuit 35 demodulate and decode the new phase-synchronized received signal, and further input the result of the error correction decoding process to the hard decision circuit 36. The second error correction decoding circuit Based on the output of 35, a hard decision process is performed to restore the transmission data. When the second error correction decoding circuit 35 is a hard decision type, the hard decision circuit 36 is not necessary.

  In this way, a transmission signal replica is generated from the signal from which the offset between the received signal and the reference phase has been eliminated, and the sub-spectrum is extracted by adding the offset to the transmission signal replica again and then deleting the band deleted on the transmission side. By generating a replica and combining it with the received signal before offset correction to generate a restored signal, it is possible to achieve continuity of amplitude and phase with the received signal.

FIG. 2 shows the configuration of Embodiment 2 of the receiving apparatus of the present invention.
The receiving apparatus according to the second embodiment has a configuration in which the second amplitude phase control circuit 27 according to the first embodiment is disposed between the receiving buffer 29 and the combining circuit 30. The reception signal accumulated in the reception buffer 29 is adjusted in amplitude phase by the second amplitude phase control circuit 27 and input to the synthesis circuit 30, and corresponds to the sub-spectrum deleted by the transmission device output from the division circuit 28. Synthesized with sub-spectrum replica. In this case, since the output of the synthesis circuit 30 is already synchronized with the reference phase, the second phase synchronization circuit 33 is not necessary.

DESCRIPTION OF SYMBOLS 11 A / D converter 12 1st serial-parallel conversion circuit 13 1st FFT circuit 14 Extraction circuit 15 Frequency shifter 16 Amplitude phase detector 17 1st amplitude phase control circuit 18 Adder circuit 19 1st IFFT circuit 20 1st parallel-serial conversion circuit 21 First phase synchronization circuit 22 First demodulation circuit 23 First error correction decoding circuit 24 Transmission signal replica generation circuit 25 Second serial-parallel conversion circuit 26 Second FFT circuit 27 Second amplitude phase control circuit 28 Dividing circuit 29 Reception buffer 30 Synthesis circuit 31 Second IFFT circuit 32 Second parallel-serial conversion circuit 33 Second phase synchronization circuit 34 Second demodulation circuit 35 Second error correction decoding circuit 36 Hard decision circuit

Claims (8)

In a receiving method of dividing a transmission signal into a plurality of sub-spectrums by a transmission apparatus, receiving a signal transmitted by removing a part of the band, and performing demodulation / decoding processing of the reception signal,
Performing phase control to make the phase between the sub-spectrums continuous when combining the plurality of sub-spectrums;
Correcting a phase offset of the phase-controlled received signal;
Demodulating the signal with the phase offset corrected;
Generating a transmit signal replica by remodulating the demodulated signal;
Extracting a sub-spectrum of a partial band removed by the transmitter from the transmission signal replica to restore the sub-spectrum replica;
Adding the phase offset to the transmitted signal replica or the sub-spectrum replica;
The received signal before the phase control and the phase offset is corrected and the sub-spectrum replica to which the phase offset is added are synthesized, and the phase offset is corrected with respect to the obtained received signal. And a demodulating step. The reception method according to claim 1,
Adjusting the amplitude of the transmission signal replica or the sub-spectrum replica, and controlling the average amplitude value of the reception signal obtained by synthesizing the sub-spectrum replica and the reception signal before the phase offset is corrected to be constant A receiving method characterized by comprising: In a receiving method of dividing a transmission signal into a plurality of sub-spectrums by a transmission apparatus, receiving a signal transmitted by removing a part of the band, and performing demodulation / decoding processing of the reception signal,
Performing phase control to make the phase between the sub-spectrums continuous when combining the plurality of sub-spectrums;
Correcting a phase offset of the phase-controlled received signal;
Demodulating the signal with the phase offset corrected;
Generating a transmit signal replica by remodulating the demodulated signal;
Extracting a sub-spectrum of a partial band removed by the transmitter from the transmission signal replica to restore the sub-spectrum replica;
Correcting the phase offset with respect to the received signal that is phase-controlled and before the phase offset is corrected;
A reception method comprising: synthesizing the reception signal with the phase offset corrected and the sub-spectrum replica, and demodulating the obtained reception signal. The reception method according to claim 3,
Adjusting the amplitude of the received signal whose phase offset has been corrected, and controlling the average amplitude value of the received signal obtained by synthesizing the received signal and the sub-spectrum replica to be constant. Method. In a receiving device that divides a transmission signal into a plurality of sub-spectrums in a transmitting device, receives a signal transmitted by removing a part of the band, and performs demodulation / decoding processing of the received signal,
First phase control means for performing phase control to make the phase between the sub-spectrums continuous when the plurality of sub-spectrums are combined;
Phase synchronization means for correcting a phase offset of the phase-controlled received signal;
Demodulation means for demodulating the signal with the phase offset corrected;
Transmission signal replica generation means for generating a transmission signal replica by remodulating the demodulated signal;
Sub-spectrum replica generation means for extracting a sub-spectrum of a partial band removed by the transmission device from the transmission signal replica and restoring the sub-spectrum replica;
Second phase control means for adding the phase offset to the transmission signal replica or the sub-spectrum replica;
The received signal before the phase control and the phase offset is corrected and the sub-spectrum replica to which the phase offset is added are synthesized, and the phase offset is corrected with respect to the obtained received signal. A receiving apparatus comprising: a synthesizing / demodulating means for demodulating. The receiving device according to claim 5,
The synthesizing / demodulating means adjusts the amplitude of the transmission signal replica or the sub-spectrum replica, and the average amplitude value of the received signal obtained by synthesizing the sub-spectrum replica and the received signal before the phase offset is corrected is constant. It is the structure controlled so that it may become. The receiver characterized by the above-mentioned. In a receiving device that divides a transmission signal into a plurality of sub-spectrums in a transmitting device, receives a signal transmitted by removing a part of the band, and performs demodulation / decoding processing of the received signal,
First phase control means for performing phase control to make the phase between the sub-spectrums continuous when the plurality of sub-spectrums are combined;
Phase synchronization means for correcting a phase offset of the phase-controlled received signal;
Demodulation means for demodulating the signal with the phase offset corrected;
Transmission signal replica generation means for generating a transmission signal replica by remodulating the demodulated signal;
Sub-spectrum replica generation means for extracting a sub-spectrum of a partial band removed by the transmission device from the transmission signal replica and restoring the sub-spectrum replica;
Second phase control means for correcting the phase offset with respect to the received signal that is phase-controlled and before the phase offset is corrected;
A receiving apparatus comprising: a received signal whose phase offset is corrected; and the sub-spectrum replica; and a synthesizing / demodulating means for demodulating the obtained received signal. The receiving device according to claim 7,
The synthesizing / demodulating means adjusts the amplitude of the received signal whose phase offset is corrected, and controls the average amplitude value of the received signal obtained by synthesizing the received signal and the sub-spectrum replica to be constant. There is a receiving device.

Images