WO2023007630A1 - Système de communication sans fil, procédé de communication sans fil, dispositif de station d'émission et dispositif adaptateur de transmission, et dispositif adaptateur de réception - Google Patents

Système de communication sans fil, procédé de communication sans fil, dispositif de station d'émission et dispositif adaptateur de transmission, et dispositif adaptateur de réception Download PDF

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WO2023007630A1
WO2023007630A1 PCT/JP2021/027959 JP2021027959W WO2023007630A1 WO 2023007630 A1 WO2023007630 A1 WO 2023007630A1 JP 2021027959 W JP2021027959 W JP 2021027959W WO 2023007630 A1 WO2023007630 A1 WO 2023007630A1
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signal
burst
spectrum
adapter device
circuit
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PCT/JP2021/027959
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English (en)
Japanese (ja)
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史洋 山下
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日本電信電話株式会社
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Priority to JP2023537829A priority Critical patent/JPWO2023007630A1/ja
Priority to PCT/JP2021/027959 priority patent/WO2023007630A1/fr
Publication of WO2023007630A1 publication Critical patent/WO2023007630A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J1/00—Frequency-division multiplex systems
    • H04J1/02—Details
    • H04J1/04—Frequency-transposition arrangements

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  • the present invention relates to wireless communication technology using spectrum decomposition/synthesis.
  • each user communicates by renting the necessary frequency band from the satellite operator.
  • Satellite transponder frequency resources are limited, and it is desired to efficiently utilize the limited frequency resources. For example, if some frequency bands have already been allocated to existing users, fine unused bands will be scattered on the frequency axis. If small unused bandwidths are scattered, it may not be possible to allocate the requested bandwidth to a new user even though the total unused bandwidth is sufficiently large. This causes a decrease in frequency utilization efficiency.
  • Non-Patent Document 1 proposes "spectrum decomposition/synthesis transmission technology" as a technique for effectively using unused bands and improving frequency utilization efficiency.
  • FIG. 1 is a conceptual diagram for explaining the outline of spectrum decomposition/synthesis transmission.
  • a signal from each user's terminal (A, B, X) is sent from a ground station to a base station via a satellite transponder. Some of the frequency bands in satellite transponders are already in use by existing users.
  • the spectrum of the transmission signal from each terminal is decomposed into a plurality of sub-spectrum, and the plurality of sub-spectrum are distributed in the unused band.
  • a transmission signal with such multiple subspectrum is sent to a base station via a satellite repeater.
  • the receiving base station recreates the original transmitted signal by combining multiple subspectra of the received signal. In this way, the scattered unused bands can be effectively used to improve frequency utilization efficiency.
  • FIG. 2 is a block diagram schematically showing the configuration of the radio communication system 1 that performs spectrum decomposition/combination. Wireless communication takes place between the transmitting system and the receiving system via a satellite repeater.
  • the transmitting side system includes a modulation circuit 2 and a spectrum decomposition circuit 3 .
  • the receiving system includes a spectrum synthesizing circuit 4 and a demodulating circuit 5 .
  • FIG. 3 shows a frame format for a typical continuous signal.
  • a frame in case of a continuous signal consists of a unique word UW and a data signal DAT.
  • the modulation circuit 2 modulates the input signal and outputs the transmission signal TA.
  • the spectrum decomposition circuit 3 performs "spectrum decomposition processing" on the transmission signal TA. More specifically, the spectrum decomposition circuit 3 includes a frequency domain transform circuit 3A, a decomposition processing circuit 3B, and a time domain transform circuit 3C.
  • the frequency domain transform circuit 3A acquires the transmission signal TA in the frequency domain by Fast Fourier Transform (FFT).
  • FFT Fast Fourier Transform
  • the decomposition processing circuit 3B decomposes the transmission signal TA into a plurality of subspectra on the frequency axis, and shifts the plurality of subspectra to desired frequency positions (unused bands), that is, dispersively arranges the subspectra.
  • the spectrally decomposed signal TD comprises a plurality of subspectrums thus generated.
  • the time domain transform circuit 3C generates and outputs a spectral decomposition signal TD in the time domain by inverse fast Fourier transform (IFFT: Inverse FFT).
  • IFFT inverse fast Fourier transform
  • the transmitting side system transmits the spectrally decomposed signal TD to the receiving side system.
  • the receiving system receives the spectrally decomposed signal TD as the spectrally decomposed signal RD.
  • the spectrum synthesizing circuit 4 performs "spectrum synthesizing processing" on the spectrally decomposed signal RD. More specifically, the spectrum synthesizing circuit 4 includes a frequency domain transforming circuit 4A, a synthesizing circuit 4B, a time domain transforming circuit 4C, and a phase difference estimating circuit 4D.
  • the frequency domain conversion circuit 4A obtains the spectrally decomposed signal RD in the frequency domain by FFT.
  • the synthesizing circuit 4B extracts and synthesizes a plurality of subspectra of the spectrally decomposed signal RD.
  • the synthesizing circuit 4B synthesizes a plurality of subspectra by returning the plurality of subspectra to the original frequency positions of the transmission signal TA.
  • the spectrum-combined signal RA has a combined spectrum.
  • the time domain conversion circuit 4C generates and outputs a spectral synthesized signal RA in the time domain by IFFT.
  • a demodulation circuit 5 demodulates the spectrum combined signal RA to obtain a received signal.
  • Phase difference compensation processing as described below is performed in the spectrum synthesis processing.
  • FIG. 4 is a conceptual diagram for explaining phase difference compensation processing.
  • the transmission delay causes a phase ramp in the spectrally decomposed signal RD at the receiving end. If the spectrum synthesizing process is performed as it is, the phase characteristic of the synthesized spectrum signal RA becomes discontinuous, degrading the transmission characteristics. Therefore, it is necessary to compensate for the phase difference at the timing of spectrum synthesis processing.
  • the spectrum-decomposed signal RD has a plurality of sub-spectrum SSP1-SSP3.
  • the phase difference between adjacent sub-spectrum SSP1 and SSP2 is ⁇ 1, and the phase difference between adjacent sub-spectrum SSP2 and SSP3 is ⁇ 2.
  • a phase difference estimating circuit 4D of the spectrum synthesizing circuit 4 estimates (detects) the phase differences ⁇ 1 and ⁇ 2 based on the plurality of subspectra SSP1 to SSP3 of the spectrally decomposed signal RD.
  • the phase difference estimation circuit 4D outputs the estimated phase differences ⁇ 1 and ⁇ 2 to the synthesizing circuit 4B.
  • the synthesizing circuit 4B corrects the phase characteristics of each subspectrum so that the phase differences .theta.1 and .theta.2 become zero, and performs spectrum synthesizing. For example, the synthesizing circuit 4B adds the correction value ⁇ 1 to the phase of the sub-spectrum SSP2, and adds the correction value ⁇ 1+ ⁇ 2 to the phase of the sub-spectrum SSP3. As a result, the phase characteristics of the synthesized spectrum signal RA are continuous.
  • FIG. 5 is a block diagram schematically showing the configuration of a wireless communication system 10A including existing modem devices.
  • the sending system includes a sending modem device 20A and an external sending adapter device 30.
  • the transmission adapter device 30 is connected (inserted) between the transmission modem device 20A and the antenna.
  • the receiving system includes a receiving modem device 50A and an external receiving adapter device 40.
  • FIG. The receiving adapter device 40 is connected (inserted) between the receiving modem device 50A and the antenna.
  • the transmission modem device 20A modulates the input signal and outputs an analog transmission signal TA.
  • the transmission adapter device 30 receives the transmission signal TA output from the transmission modem device 20A.
  • the transmission adapter device 30 includes an A/D conversion circuit 31, a spectrum decomposition circuit 33, and a D/A conversion circuit .
  • the A/D conversion circuit 31 converts an input analog transmission signal TA into a digital transmission signal TA.
  • the spectrum decomposition circuit 33 has the same configuration as the spectrum decomposition circuit 3 shown in FIG. 2, and generates a spectrum decomposition signal TD by performing spectrum decomposition processing on the transmission signal TA.
  • the D/A conversion circuit 34 converts the spectrally decomposed signal TD into an analog spectrally decomposed signal TD and outputs it.
  • the transmitting side system transmits the spectrally decomposed signal TD to the receiving side system.
  • the receiving system receives the spectrally decomposed signal TD as the spectrally decomposed signal RD.
  • the reception adapter device 40 includes an A/D conversion circuit 41, a spectrum synthesis circuit 42, and a D/A conversion circuit 44.
  • the A/D conversion circuit 41 converts the input analog spectrum-decomposed signal RD into a digital spectrum-decomposed signal RD.
  • the spectrum synthesizing circuit 42 has the same configuration as the spectrum synthesizing circuit 4 shown in FIG. 2, and generates a spectrum synthesizing signal RA by subjecting the decomposed spectrum signal RD to spectrum synthesizing processing.
  • the D/A conversion circuit 44 converts the spectrum synthesized signal RA into an analog spectrum synthesized signal RA and outputs it to the receiving modem device 50A.
  • the receiving modem device 50A demodulates the spectrum combined signal RA to obtain a received signal.
  • FIG. 6 is a conceptual diagram showing a general burst signal frame format.
  • a burst signal frame includes a preamble signal PRE, a unique word UW, and a data signal DAT.
  • the preamble signal PRE includes the reproduced carrier signal CA and the reproduced timing signal TM, and is placed before the unique word UW.
  • FIG. 7 is a block diagram schematically showing the configuration of a radio communication system 10B that performs spectrum decomposition/combination of burst signals. The description overlapping with that of FIG. 5 described above will be omitted as appropriate.
  • the transmitting system includes a transmitting burst modem device 20B and an external transmitting adapter device 30.
  • the transmission adapter device 30 is connected (inserted) between the transmission burst modem device 20B and the antenna.
  • the receiving system includes a receiving burst modem device 50B and an external receiving adapter device 40.
  • FIG. The receiving adapter device 40 is connected (inserted) between the receiving burst modem device 50B and the antenna.
  • the transmission burst modem device 20B outputs a burst signal TB having a frame format as shown in FIG.
  • the transmission adapter device 30 receives the burst signal TB output from the transmission burst modem device 20B.
  • the transmission adapter device 30 performs spectral decomposition processing on the input burst signal TB to generate and output a spectrally decomposed signal TD.
  • the reception adapter device 40 generates a spectrum-combined signal RB by performing spectrum-combining processing on the received spectrum-decomposed signal RD.
  • Receiving adapter device 40 outputs spectrum synthesized signal RB to receiving burst modem device 50B.
  • the receiving burst modem device 50B includes a burst detection circuit and a burst demodulation circuit.
  • the burst detection circuit detects the reception timing of the burst signal based on the combined spectrum signal RB.
  • the burst detection timing is the detected burst signal reception timing. If the burst detection timing is known, the burst signal frame interval can be estimated based on known frame format information.
  • the burst demodulation circuit burst-demodulates the spectrum-combined signal RB to obtain a received signal.
  • FIG. 8 is a conceptual diagram for explaining phase difference compensation processing in the case of burst signals.
  • the data signal DAT is a modulated signal made up of random bits.
  • the spectrally decomposed signal RD has the same subspectra SSP1-SSP3 as in the case of the continuous signal shown in FIG.
  • adjacent sub-spectrum SSP1 and SSP2 intersect at intersection frequency f1
  • adjacent sub-spectrum SSP2 and SSP3 intersect at intersection frequency f2.
  • a phase difference estimating circuit 4D estimates a phase difference ⁇ 1 (see FIG. 4) based on the respective phases of the sub-spectra SSP1 and SSP2 at the intersection frequency f1.
  • the phase difference estimating circuit 4D estimates the phase difference ⁇ 2 (see FIG. 4) based on the respective phases of the sub-spectra SSP2 and SSP3 at the intersection frequency f2.
  • the carrier reproduction signal CA of the preamble signal PRE is an unmodulated signal consisting of consecutive identical bits.
  • the spectrum of the spectrally decomposed signal RD becomes a line spectrum as shown in FIG.
  • the phase difference estimation circuit 4D operates even if there is no significant signal. As a result, the phase difference estimation circuit 4D outputs meaningless erroneous phase differences ⁇ 1' and ⁇ 2' instead of correct phase differences ⁇ 1 and ⁇ 2 to the synthesizing circuit 4B.
  • the synthesizing circuit 4B corrects the phase characteristics of each subspectrum based on the erroneous phase differences ⁇ 1' and ⁇ 2', and performs spectrum synthesizing processing. Therefore, the phase characteristic of the combined spectrum signal RB is not continuous, and a phase difference remains. Specifically, a phase difference of ⁇ 1 ⁇ 1′ remains at the intersection frequency f1, and a phase difference of ⁇ 1+ ⁇ 2 ⁇ 1′ ⁇ 2′ remains at the intersection frequency f2.
  • FIG. 9 is a conceptual diagram for explaining problems when phase difference estimation is not performed correctly.
  • the burst detection circuit of the receiving burst modem device 50B detects the reception timing of the burst signal (burst detection timing). Specifically, the burst detection circuit compares the absolute value of the accumulated symbol phase difference of the spectrum combined signal RB with a threshold value. Then, the burst detection circuit uses the timing at which the absolute value of the cumulative value of the symbol phase differences exceeds the threshold value as the burst detection timing. If the burst detection timing is known, burst demodulation becomes possible.
  • phase difference estimation is not performed correctly in the reception period of the preamble signal PRE (carrier reproduction signal CA).
  • the phase difference compensation process becomes imperfect, and the phase difference (discontinuity) remains in the phase characteristics of the combined spectrum signal RB.
  • the absolute value of the cumulative value of the symbol phase difference does not reach the threshold during the reception period of the preamble signal PRE (carrier recovery signal CA). That is, there is a possibility that burst detection timing cannot be obtained. If burst detection timing cannot be obtained, burst demodulation cannot be performed.
  • One object of the present invention is to provide a technique capable of appropriately transmitting burst signals using spectrum decomposition/synthesis.
  • a wireless communication system is a transmit adapter device connected to the transmit burst modem device; a receiving adapter device connected to the receiving burst modem device.
  • the transmitting adapter device generating a corrected burst signal by adding a phase synchronization signal containing random bits to the front of a preamble signal of a burst signal input from a transmission burst modem device; generating a spectrum-decomposed signal having a plurality of sub-spectrum by decomposing the corrected burst signal into a plurality of sub-spectrum on the frequency axis; It is configured to transmit a spectrally decomposed signal.
  • the receiving adapter device receiving a spectrally decomposed signal; estimating a phase difference between the plurality of subspectra based on the plurality of subspectra of the spectrally decomposed signal corresponding to the phase synchronization signal; generating a spectrally synthesized signal by synthesizing a plurality of subspectra of the spectrally decomposed signal while compensating for the estimated phase difference; It is configured to output a spectrum synthesized signal to a receiving burst modem device.
  • a second aspect relates to a wireless communication method for performing wireless communication between a transmission adapter device connected to a transmission burst modem device and a reception adapter device connected to a reception burst modem device.
  • the wireless communication method is a process of generating a corrected burst signal by adding a phase synchronization signal containing random bits to the front stage of a preamble signal of a burst signal input from a transmission burst modem device to a transmission adapter device; a process of generating a spectrum-decomposed signal having a plurality of sub-spectrum by decomposing the corrected burst signal into a plurality of sub-spectrums on the frequency axis; a process of transmitting the spectrally decomposed signal from the transmitting adapter device to the receiving adapter device; a process of estimating a phase difference between the plurality of subspectra based on the plurality of subspectra of the spectrally decomposed signal corresponding to the phase synchronization signal; generating a
  • a third aspect relates to a transmitting adapter device connected to a transmitting burst modem device and communicating with a receiving system.
  • the transmitting adapter device a signal correction circuit for generating a corrected burst signal by adding a phase synchronization signal containing random bits to the front stage of a preamble signal of a burst signal input from a transmission burst modem; a spectrum decomposition circuit that generates a spectrum decomposition signal having a plurality of subspectrums by decomposing the corrected burst signal into a plurality of subspectras on the frequency axis.
  • the receiving system receiving a spectrally decomposed signal transmitted from a transmission adapter device; estimating a phase difference between the plurality of subspectra based on the plurality of subspectra of the spectrally decomposed signal corresponding to the phase synchronization signal; It is configured to generate a spectrally combined signal by combining a plurality of subspectra of the spectrally decomposed signal while compensating for the estimated phase difference.
  • a fourth aspect relates to a receiving adapter device that is connected to the receiving burst modem device and communicates with the sending system.
  • the sending system generating a corrected burst signal by adding a phase synchronization signal containing random bits to the front of the preamble signal of the burst signal; generating a spectrum-decomposed signal having a plurality of sub-spectrum by decomposing the corrected burst signal into a plurality of sub-spectrum on the frequency axis; It is configured to transmit the spectrally decomposed signal to a receiving adapter device.
  • the receiving adapter device a phase difference estimation circuit for estimating a phase difference between a plurality of subspectra based on a plurality of subspectra of the spectrally decomposed signal corresponding to the phase synchronization signal; a spectrum synthesis circuit for generating a spectrum synthesis signal by synthesizing a plurality of subspectra of the spectrum decomposed signal while compensating for the estimated phase difference, and outputting the spectrum synthesis signal to the receiving burst modem device.
  • a phase synchronization signal including random bits is added before the preamble signal of the burst signal.
  • the receiving side can accurately estimate the phase difference between a plurality of subspectra.
  • spectrum synthesis processing is performed while compensating for the estimated phase difference. Since the phase difference compensation process and the spectrum synthesis process are performed with high precision even for the preamble signal of the burst signal, it is possible to detect the reception timing of the burst signal and appropriately perform burst demodulation.
  • FIG. 2 is a conceptual diagram for explaining an outline of spectrum decomposition/synthesis transmission
  • 1 is a block diagram schematically showing a configuration example of a radio communication system that performs spectrum decomposition/combination according to conventional technology
  • FIG. 1 is a conceptual diagram showing a frame format for a general continuous signal
  • FIG. FIG. 4 is a conceptual diagram for explaining phase difference compensation processing during spectrum synthesis processing
  • FIG. 4 is a block diagram schematically showing another configuration example of a radio communication system that performs spectrum decomposition/synthesis according to the prior art
  • 1 is a conceptual diagram showing a general burst signal frame format
  • FIG. 1 is a block diagram schematically showing the configuration of a radio communication system that performs spectrum decomposition/combination of burst signals
  • FIG. 4 is a conceptual diagram for explaining problems in the case of burst signals;
  • FIG. 4 is a conceptual diagram for explaining problems in the case of burst signals;
  • 1 is a block diagram schematically showing the configuration of a radio communication system according to an embodiment of the present invention;
  • FIG. 1 is a block diagram showing a configuration example of a transmission adapter device according to an embodiment of the present invention;
  • FIG. 4 is a conceptual diagram for explaining a corrected burst signal according to the embodiment of the invention;
  • FIG. 4 is a conceptual diagram for explaining signal correction processing by the transmission adapter device according to the embodiment of the present invention;
  • 1 is a block diagram showing a configuration example of a reception adapter device according to an embodiment of the present invention;
  • FIG. 4 is a conceptual diagram for explaining phase difference compensation processing according to the embodiment of the present invention;
  • FIG. 10 is a block diagram schematically showing the configuration of radio communication system 100 according to the present embodiment.
  • the wireless communication system 100 includes a transmitting system 100T and a receiving system 100R. Wireless communication is performed between the transmitting side system 100T and the receiving side system 100R.
  • wireless communication system 100 is a satellite communication system. In that case, wireless communication is performed between the transmitting side system 100T and the receiving side system 100R via the satellite transponder.
  • the transmission side system 100T includes a transmission burst modem device 200 and an external transmission adapter device 300.
  • the transmission adapter device 300 is connected (inserted) between the transmission burst modem device 200 and the antenna.
  • the receiving system 100R includes a receiving burst modem device 500 and an external receiving adapter device 400.
  • FIG. The receiving adapter device 400 is connected (inserted) between the receiving burst modem device 500 and the antenna.
  • the transmission burst modem device 200 outputs a burst signal TB (analog) having a frame format as shown in FIG.
  • the transmission adapter device 300 receives the burst signal TB output from the transmission burst modem device 200 .
  • the transmission adapter device 300 generates and outputs a spectrally decomposed signal TD by performing a spectrally decomposing process on the input burst signal TB.
  • FIG. 11 is a block diagram showing a configuration example of the transmission adapter device 300.
  • the transmission adapter device 300 includes an A/D conversion circuit 310 , a signal correction circuit 320 , a spectrum decomposition circuit 330 and a D/A conversion circuit 340 .
  • the A/D conversion circuit 310 converts the analog burst signal TB input from the transmission burst modem device 200 into a digital burst signal TB.
  • the A/D conversion circuit 310 outputs a digital burst signal TB to the signal correction circuit 320 .
  • the signal correction circuit 320 generates a "corrected burst signal TC" by performing signal correction processing on the input burst signal TB.
  • FIG. 12 is a conceptual diagram for explaining the corrected burst signal TC.
  • the corrected burst signal TC further includes a "phase synchronization signal PS" in addition to the signals shown in FIG. That is, the corrected burst signal TC further includes the phase synchronization signal PS in addition to the preamble signal PRE (carrier reproduction signal CA, timing reproduction signal TM), unique word UW, and data signal DAT.
  • This phase synchronization signal PS contains random bits.
  • the phase synchronization signal PS containing random bits is placed before the preamble signal PRE and used in spectrum synthesis processing (phase difference compensation processing), which will be described later.
  • the signal correction circuit 320 generates a corrected burst signal TC by adding a phase synchronization signal PS including random bits to the front stage of the preamble signal PRE of the burst signal TB.
  • the signal correction circuit 320 includes a delay circuit 321, a burst detection circuit 322, a phase synchronization signal generation circuit 323, a modulation circuit 324, and an addition circuit 325.
  • the delay circuit 321 delays the input burst signal TB for a certain period of time and outputs the delayed signal to the addition circuit 325 .
  • the delayed burst signal TB output from the delay circuit 321 is called a burst signal TBd (see FIG. 13).
  • the burst detection circuit 322 detects the top frame timing of the burst signal TB based on the input burst signal TB.
  • a phase synchronization signal generation circuit 323 generates a phase synchronization signal PS containing random bits.
  • the modulation circuit 324 modulates the phase synchronization signal PS and outputs it to the addition circuit 325 .
  • the adder circuit 325 generates the corrected burst signal TC by adding the burst signal TBd and the phase synchronization signal PS, triggered by the detection of the burst frame by the burst detection circuit 322 .
  • the adder circuit 325 generates the corrected burst signal TC by inserting the phase synchronization signal PS before the delayed burst signal TBd (see FIG. 13).
  • the signal correction circuit 320 outputs the corrected burst signal TC thus generated to the spectrum decomposition circuit 330 .
  • the spectrum decomposition circuit 330 generates a spectrum decomposition signal TD by performing "spectrum decomposition processing" on the input corrected burst signal TC. More specifically, spectrum decomposition circuit 330 includes frequency domain transform circuit 331 , decomposition processing circuit 332 , and time domain transform circuit 333 .
  • the frequency domain transform circuit 331 obtains the corrected burst signal TC in the frequency domain by Fast Fourier Transform (FFT).
  • the decomposition processing circuit 332 decomposes the corrected burst signal TC into a plurality of subspectra on the frequency axis, and shifts the plurality of subspectra to desired frequency positions (unused bands), that is, dispersively arranges them.
  • the spectrally decomposed signal TD comprises a plurality of subspectrums thus generated.
  • the time domain transform circuit 333 generates and outputs a spectrally decomposed signal TD in the time domain by inverse fast Fourier transform (IFFT: Inverse FFT).
  • IFFT inverse fast Fourier transform
  • the D/A conversion circuit 340 converts the decomposed spectrum signal TD into an analog decomposed spectrum signal TD and outputs it.
  • the transmission adapter device 300 of the transmission side system 100T transmits the spectrally decomposed signal TD to the reception side system 100R.
  • the receiving adapter device 400 of the receiving system 100R receives the decomposed spectrum signal TD as the decomposed spectrum signal RD.
  • FIG. 14 is a block diagram showing a configuration example of the reception adapter device 400.
  • Receiving adapter device 400 includes A/D conversion circuit 410 , spectrum synthesis circuit 420 , burst detection circuit 430 and D/A conversion circuit 440 .
  • the A/D conversion circuit 410 converts the input analog spectrum-decomposed signal RD into a digital spectrum-decomposed signal RD.
  • A/D conversion circuit 410 outputs spectrum decomposed signal RD to spectrum synthesis circuit 420 .
  • the spectrum synthesis circuit 420 generates a spectrum synthesis signal RB by performing "spectrum synthesis processing" on the input spectrum decomposition signal RD. More specifically, spectrum synthesizing circuit 420 includes frequency domain transforming circuit 421 , synthesizing processing circuit 422 , time domain transforming circuit 423 , and phase difference estimating circuit 424 .
  • the frequency domain conversion circuit 421 acquires the spectrally decomposed signal RD in the frequency domain by FFT.
  • Synthesis processing circuit 422 extracts and synthesizes a plurality of subspectra of spectrally decomposed signal RD.
  • the synthesizing circuit 422 synthesizes a plurality of subspectra by returning the plurality of subspectra to the original frequency positions of the burst signal TB.
  • the spectrum-combined signal RB has a spectrum after combining.
  • the time domain conversion circuit 423 generates and outputs a spectral composite signal RB in the time domain by IFFT.
  • phase difference compensation processing is performed in the spectrum synthesis processing. Specifically, phase difference estimating circuit 424 estimates (detects) phase differences between a plurality of subspectra based on a plurality of subspectra of spectrally decomposed signal RD. The phase difference estimation circuit 424 outputs the estimated phase difference to the synthesis processing circuit 422 . Synthesis processing circuit 422 performs spectrum synthesis processing while compensating for the estimated phase difference. That is, the synthesizing circuit 422 corrects the phase characteristic of each sub-spectrum so that the phase difference becomes 0, and performs spectrum synthesizing processing. As a result, the phase characteristics of the combined spectrum signal RB are continuous.
  • FIG. 15 is a conceptual diagram for explaining phase difference compensation processing during spectrum synthesis processing according to the present embodiment.
  • the phase synchronization signal PS contains random bits. Accordingly, the spectrally decomposed signal RD corresponding to the phase synchronization signal PS has a plurality of subspectrums similar to those of the data signal DAT. In the example shown in FIG. 15, the spectrum-decomposed signal RD corresponding to the phase synchronization signal PS has a plurality of sub-spectrum SSP1-SSP3.
  • phase difference estimating circuit 424 estimates the phase difference ⁇ 1 between the adjacent sub-spectrum SSP1, SSP2 based on the respective phases of the sub-spectrum SSP1, SSP2 at the intersection frequency f1. Similarly, the phase difference estimation circuit 424 estimates the phase difference ⁇ 2 between the adjacent sub-spectrum SSP2, SSP3 based on the respective phases of the sub-spectrum SSP2, SSP3 at the intersection frequency f2.
  • the phase difference estimating circuit 424 can estimate the phase differences ⁇ 1 and ⁇ 2 based on the multiple subspectra SSP1 to SSP3 of the spectrally decomposed signal RD corresponding to the phase synchronization signal PS.
  • a phase difference estimating circuit 424 holds the phase differences ⁇ 1 and ⁇ 2 estimated in the reception period of the phase synchronization signal PS.
  • the phase difference estimating circuit 424 includes a holding circuit 425 that holds the phase differences ⁇ 1 and ⁇ 2 estimated during the reception period of the phase synchronization signal PS.
  • the phase difference estimation circuit 424 outputs the phase differences ⁇ 1 and ⁇ 2 held in the holding circuit 425 to the synthesizing circuit 422 .
  • the synthesis processing circuit 422 performs spectrum synthesis processing while compensating the estimated phase differences ⁇ 1 and ⁇ 2.
  • the synthesis processing circuit 422 Based on the phase differences ⁇ 1 and ⁇ 2 held in the holding circuit 425, the synthesis processing circuit 422 performs spectrum synthesis processing on the spectrum decomposed signal RD corresponding to the preamble signal PRE. Since the correct phase differences ⁇ 1 and ⁇ 2 are used, phase difference compensation processing and spectrum synthesis processing can be performed with high precision even for the preamble signal PRE.
  • a burst detection circuit 430 receives the spectrum synthesized signal RB output from the time domain conversion circuit 423 .
  • the burst detection circuit 430 detects the burst signal reception timing (burst detection timing) based on the spectrum synthesized signal RB corresponding to the preamble signal PRE (see FIG. 9).
  • the burst detection circuit 430 notifies the phase difference estimation circuit 424 of burst detection timing. If the burst detection timing is known, the burst frame receiving period can be estimated based on known frame format information.
  • a holding circuit 425 holds the estimated phase differences ⁇ 1 and ⁇ 2 until at least the end of the burst frame reception interval.
  • the synthesis processing circuit 422 Based on the phase differences ⁇ 1 and ⁇ 2 held in the holding circuit 425, the synthesis processing circuit 422 performs spectrum synthesis processing on the unique word UW and the spectrum decomposed signal RD corresponding to the data signal DAT. Since accurate phase differences ⁇ 1 and ⁇ 2 are used, phase difference compensation processing and spectrum synthesis processing can be performed with high accuracy also for unique word UW and data signal DAT.
  • the D/A conversion circuit 440 converts the spectrum synthesis signal RB output from the spectrum synthesis circuit 420 into an analog spectrum synthesis signal RB.
  • Receiving adapter device 400 outputs spectrum synthesized signal RB thus generated to receiving burst modem device 500 .
  • the receiving burst modem device 500 receives the spectrum synthesized signal RB output from the receiving adapter device 400 .
  • Receive burst modem apparatus 500 includes burst detection circuitry and burst demodulation circuitry.
  • the burst detection circuit detects the reception timing of the burst signal based on the combined spectrum signal RB. More specifically, the burst detection circuit compares the absolute value of the accumulated symbol phase difference of the spectrum combined signal RB with a threshold value. Then, the burst detection circuit uses the timing at which the absolute value of the cumulative value of the symbol phase differences exceeds the threshold value as the burst detection timing (see FIG. 9). If the burst detection timing is known, the burst signal frame interval can be estimated based on known frame format information.
  • the burst demodulation circuit burst-demodulates the spectrum-combined signal RB to obtain a received signal.
  • phase synchronization signal PS including random bits is added before preamble signal PRE of a burst signal.
  • Receiving adapter apparatus 400 can accurately estimate the phase difference between a plurality of subspectra by using the phase synchronization signal PS. Then, spectrum synthesis processing is performed while compensating for the estimated phase difference. Since the phase difference compensation process and the spectrum synthesis process are performed with high precision even on the preamble signal PRE of the burst signal, it is possible to detect the reception timing of the burst signal and appropriately perform burst demodulation. That is, according to this embodiment, it is possible to appropriately transmit a burst signal using spectrum decomposition/synthesis.
  • a transmission adapter device 300 and a reception adapter device 400 are provided.
  • these transmission adapter device 300 and reception adapter device 400 it is possible to realize spectrum decomposition/synthesis transmission of burst signals between the existing transmission burst modem device 200 and the existing reception burst modem device 500. Become.
  • REFERENCE SIGNS LIST 100 wireless communication system 100T transmission side system 100R reception side system 200 transmission burst modem device 300 transmission adapter device 320 signal correction circuit 330 spectrum decomposition circuit 332 decomposition processing circuit 400 reception adapter device 420 spectrum synthesis circuit 422 synthesis processing circuit 424 phase difference estimation circuit 425 holding circuit 500 receiving burst modem device CA carrier reproduction signal DAT data signal PRE preamble signal PS phase synchronization signal TM timing reproduction signal UW unique word

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  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

Système de communication sans fil comprenant : un dispositif adaptateur de transmission connecté à un dispositif modem en rafale de transmission ; et un dispositif adaptateur de réception connecté à un dispositif modem en rafale de réception. Le dispositif adaptateur de transmission génère un signal de rafale corrigé en ajoutant un signal de synchronisation de phase, comprenant un bit aléatoire, à un pré-étage d'un signal de préambule d'un signal de rafale entré depuis le dispositif modem en rafale de transmission. De plus, le dispositif adaptateur de transmission génère des signaux de décomposition de spectre par décomposition du signal de rafale corrigé en une pluralité de sous-spectres. Le dispositif adaptateur de réception reçoit les signaux de décomposition de spectre, et estime une différence de phase entre la pluralité de sous-spectres sur la base de la pluralité de sous-spectres du signal de décomposition de spectre qui correspond au signal de synchronisation de phase. Le dispositif adaptateur de réception génère un signal de synthèse de spectre par synthèse de la pluralité de sous-spectres tout en compensant la différence de phase estimée, et délivre le signal de synthèse de spectre vers le dispositif modem en rafale de réception.
PCT/JP2021/027959 2021-07-28 2021-07-28 Système de communication sans fil, procédé de communication sans fil, dispositif de station d'émission et dispositif adaptateur de transmission, et dispositif adaptateur de réception WO2023007630A1 (fr)

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