Automatic Frequency Response Compensation Method and Device for Wide-Bandwidth OTFS Signal Receiving Channel

Abstract

The present invention discloses a method and device for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel, belonging to the field of 6G broadband communication wireless technology. It includes down-conversion, A / D acquisition, IQ demodulation, decimation filtering, FIR filtering, CP elimination, M-point FFT, M-point IFFT, N-point FFT, digital demodulation, digital modulation, ISSFT transform, obtaining group delay and frequency response error information, setting the shaping filter h factor, M-point DFT, eliminating group delay and frequency response error information, and converting the filtering factor. By performing down-conversion, signal processing, FIR filtering, and signal demodulation measures on the received signal to restore the original code stream; at the same time, comparing the original code stream with the theoretical signal, calculating the frequency response error and group delay error of the receiving channel, and superimposing the error data onto the shaping filter factor for FIR filtering, it realizes the adaptive adjustment of the FIR filter coefficients, thereby achieving the automatic compensation of the frequency response of the large-bandwidth OTFS signal receiving channel.

Description

Technical Field

[0001] The present invention belongs to the technical field of 6G broadband communication, and particularly relates to a method and device for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel. Background Art

[0002] OTFS (Orthogonal Time Frequency and Space) is a new modulation and multiple access technology, which is considered to have potential application scenarios in 6G communication. By separating and processing signals in the time-frequency domain, OTFS technology can overcome problems such as multipath fading, frequency selective fading, and time-frequency interference faced in traditional communication systems, thereby providing higher spectral efficiency and better signal coverage. However, currently, OTFS-related technologies are still in the research and development stage, and their specific applications in 6G communication still require further research and verification. Nevertheless, based on its potential advantages and characteristics, OTFS technology is expected to play an important role in future 6G communication.

[0003] In an OTFS broadband communication system, in-band frequency response compensation can improve the quality of OTFS signal reception and eliminate the distortion problem of the frequency-power relationship caused by the characteristics of devices during the transmission of the RF channel in the receiving device. By modeling and estimating the RF receiving channel, a suitable compensation filter can be designed to offset the distortion of the signal at different frequencies, thereby improving the transmission quality of the signal. At the same time, this technology can be used for the standardization work of the large-bandwidth OTFS signal receiving technology in 6G mobile communication, helping to formulate standards and specifications for the large-bandwidth OTFS signal receiving technology; it can be used for the research of 6G large-bandwidth OTFS communication systems and test equipment, helping researchers to improve the performance of 6G large-bandwidth OTFS communication systems; it can be used for the simulation and optimization of 6G large-bandwidth OTFS communication systems, optimizing the design and performance of 6G large-bandwidth OTFS communication systems. Whether the improvement of the frequency response compensation technology of the large-bandwidth OTFS signal receiving channel can truly meet the requirements of typical application scenarios of 6G communication for the quality of received OTFS signals will be one of the key technologies for the multi-scenario application of OTFS technology in 6G communication, and it has also become one of the difficult problems in the industry when implementing OTFS broadband communication engineering.

[0004] Therefore, researching a method and device for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel is of great significance for the research and development of 6G large-bandwidth OTFS communication systems and is an important part of the development of 6G large-bandwidth OTFS communication systems. Summary of the Invention

[0005] In view of the deficiencies of the existing technologies, the present invention proposes a method and device for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel. Through the research on large-bandwidth OTFS signals, the design and implementation of each unit of the receiving channel, and through the research on the in-band frequency response compensation algorithm and the design and implementation of each unit in the in-band frequency response compensation, a method and device for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel are realized, meeting the requirements of the research on 6G large-bandwidth OTFS signal communication systems and the development of equipment.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A method for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel, characterized by comprising the following steps:

[0008] Step 1: Down-convert the wireless communication OTFS signal r(t) to generate an intermediate-frequency signal m(t);

[0009] Step 2: Digitalize the intermediate-frequency signal m(t) to generate an OTFS digital signal s(i) with carrier characteristics;

[0010] Step 3: Perform IQ demodulation on the OTFS digital signal s(i) to form a first OTFS digital IQ signal:

[0011] S I (i) = s(i) * cos(ω c T s )

[0012] S Q (i) = s(i) * sin(ω c T s )

[0013] wherein, S I (i) represents the first I-channel data, S Q (i) represents the first Q-channel data, i represents the serial number of the sampling point, ω c is the carrier angular frequency, and T s is the sampling period;

[0014] Step 4: According to the communication data rate requirement of the OTFS digital signal s(i), perform signal resampling and filtering on the first OTFS digital IQ signal to generate a second OTFS digital IQ signal that meets the communication data rate requirement;

[0015] Step 5: Perform FIR filtering on the second OTFS digital IQ signal to compensate for the channel frequency response error, eliminate the group delay error introduced by the channel, and the inter-symbol interference noise of the OTFS signal, and obtain a third OTFS digital IQ signal;

[0016] Step 6: Set the CP parameters according to the wireless communication OTFS signal r(t), remove the guard time slot data of the third OTFS digital IQ signal, and form the fourth OTFS digital IQ signal;

[0017] Step 7: Perform an M-point FFT transformation on the fourth OTFS digital IQ signal to convert the time-domain signal into a time-frequency domain signal, and form the X TF [N,M] OTFS time-frequency domain signal; where M is the number of subcarriers and N is the number of signal time slots;

[0018] Step 8: Perform an M-point IFFT transformation on the X TF [N,M] OTFS time-frequency domain signal to form the X TD [N,M] OTFS time-delay domain signal;

[0019] Step 9: Perform an N-point FFT transformation on the X TD [N,M] OTFS time-delay domain signal to form the X DD [N,M] OTFS time-delay Doppler domain signal;

[0020] Step 10: Demodulate the X DD [N,M] OTFS time-delay Doppler domain digital signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal s(i) to obtain the original code stream signal with in-band frequency response compensation for the receiving channel completed.

[0021] Further, in the said Step 5, the FIR filtering method includes the following steps:

[0022] Step 11: Modulate the original code stream signal digitally according to the resource allocation and modulation characteristic requirements of the OTFS digital signal s(i) to generate a theoretical modulation signal;

[0023] Step 12: Map the theoretical modulation signal onto the time-delay Doppler domain matrix to obtain a theoretical OTFS time-delay Doppler domain signal; then convert the theoretical OTFS time-delay Doppler domain signal into a theoretical OTFS time-frequency domain signal;

[0024] Step 13: Compare and calculate the theoretical OTFS time-frequency domain signal with the X TF [N,M] OTFS time-frequency domain signal to generate frequency response error data in the frequency domain and group delay error data in the time delay;

[0025] Step 14: Generate a shaping filter h factor according to the shaping filter parameters of the OTFS digital signal s(i); this shaping filter h factor is used to eliminate the inter-symbol interference of the OTFS signal;

[0026] Step 15: Perform M - point DFT transformation on the shaping filter h factor to convert it into the amplitude - frequency response of the initial shaping filter and the group delay response of the initial shaping filter;

[0027] Step 16: Superimpose the frequency response error data on the amplitude - frequency response of the initial shaping filter, and superimpose the group delay error data on the group delay response of the initial shaping filter to obtain the amplitude - frequency response of the shaping filter with error compensation data and the group delay response of the shaping filter; among them, at the initial operation, that is, when no original code stream signal is generated, the frequency response error data and the group delay error are set to 0;

[0028] Step 17: Convert the amplitude - frequency response of the shaping filter with error compensation data and the group delay response of the shaping filter into filter factors, and perform FIR filtering on the second OTFS digital IQ signal to complete the in - band frequency response compensation work of the receiving channel.

[0029] Based on the above - mentioned method, a large - bandwidth OTFS signal receiving channel frequency response automatic compensation device of the present invention is characterized in that it includes a down - conversion unit, an A / D acquisition unit, an IQ demodulation unit, a decimation and filtering unit, an FIR filtering unit, a CP removal unit, an M - point FFT unit, an M - point IFFT unit, an N - point FFT unit, a digital demodulation unit, a digital modulation unit, an ISSFT transformation unit, a unit for obtaining group delay and frequency response error information, a unit for setting the shaping filter h factor, an M - point DFT unit, a unit for removing group delay and frequency response error information, and a unit for converting filter factors;

[0030] The down - conversion unit down - converts the input OTFS signal to generate an intermediate - frequency signal and sends it to the A / D acquisition unit;

[0031] The A / D acquisition unit digitizes the intermediate - frequency signal to generate an OTFS digital signal with carrier characteristics and sends it to the IQ demodulation unit;

[0032] The IQ demodulation unit performs IQ demodulation processing on the OTFS digital signal according to the local digital local oscillator signal to form a first OTFS digital IQ signal and sends it to the decimation and filtering unit;

[0033] The decimation and filtering unit resamples and filters the first OTFS digital IQ signal according to the communication data rate requirement of the OTFS digital signal to generate a second OTFS digital IQ signal that meets the communication data rate requirement and sends it to the FIR filtering unit;

[0034] The FIR filtering unit performs FIR filtering on the second OTFS digital IQ signal according to the filter factors fed back by the M - point DFT unit to obtain a third OTFS digital IQ signal and sends it to the CP removal unit;

[0035] The CP elimination unit sets CP parameters according to the wireless communication OTFS signal, removes the guard time slot data of the third OTFS digital IQ signal, forms a fourth OTFS digital IQ signal and sends it to the M-point FFT unit;

[0036] The M-point FFT unit performs M-point FFT transformation on the fourth OTFS digital IQ signal, converts the time-domain signal into a time-frequency domain signal, and forms an X TF [N,M] OTFS time-frequency domain signal and sends it to the M-point IFFT unit and the unit for obtaining group delay and frequency response error information; where M is the number of subcarriers and N is the number of signal time slots;

[0037] The M-point IFFT unit performs M-point IFFT transformation on the X TF [N,M] OTFS time-frequency domain signal to form an X TD [N,M] OTFS time-delay domain signal and sends it to the N-point FFT unit;

[0038] The N-point FFT unit performs N-point FFT transformation on the X TD [N,M] OTFS time-delay domain signal to form an X DD [N,M] OTFS time-delay Doppler domain signal and sends it to the digital demodulation unit;

[0039] The digital demodulation unit digitally demodulates the X DD [N,M] OTFS time-delay Doppler domain digital signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal to obtain the original code stream signal with in-band frequency response compensation in the receiving channel; the original code stream signal is output as a result and sent to the digital modulation unit at the same time;

[0040] The digital modulation unit digitally modulates the original code stream signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal, generates a theoretical modulation signal and sends it to the ISSFT transformation unit;

[0041] The ISSFT transformation unit maps the theoretical modulation signal onto the time-delay Doppler domain matrix to obtain a theoretical OTFS time-delay Doppler domain signal; then converts the theoretical OTFS time-delay Doppler domain signal into a theoretical OTFS time-frequency domain signal and sends it to the unit for obtaining group delay and frequency response error information;

[0042] The unit for obtaining group delay and frequency response error information compares the theoretical OTFS time-frequency domain signal with the X TFPerform a comparison operation on the [N,M] OTFS time-frequency domain signal, generate frequency response error data in the frequency domain, generate group delay error data in terms of time delay, and send them to the group delay and frequency response error cancellation information unit;

[0043] The shaping filter h factor setting unit generates a shaping filter h factor according to the shaping filter parameters of the OTFS digital signal s(i) and sends it to the M-point DFT unit; the M-point DFT unit performs an M-point DFT transformation on the shaping filter h factor, converts it into the initial shaping filter amplitude-frequency response and the initial shaping filter group delay response, and sends them to the group delay and frequency response error cancellation information unit;

[0044] The group delay and frequency response error cancellation information unit superimposes the frequency response error data on the initial shaping filter amplitude-frequency response, superimposes the group delay error data on the initial shaping filter group delay response, obtains the shaping filter amplitude-frequency response with error compensation data and the shaping filter group delay response, and sends them to the conversion filter factor unit;

[0045] The conversion filter factor unit converts the shaping filter amplitude-frequency response with error compensation data and the shaping filter group delay response into filter factors and sends them to the FIR filter unit to complete the in-band frequency response compensation work of the receiving channel.

[0046] The present invention has the following beneficial technical effects:

[0047] A method and device for automatic frequency response compensation of a large-bandwidth OTFS signal receiving channel provided by the present invention restore the original code stream through down-conversion, signal processing, FIR filtering, and signal demodulation measures; at the same time, during the process of restoring the original code stream, by comparing the original code stream with the theoretical signal, the frequency response error and group delay error of the receiving channel are calculated, and the error data is superimposed on the shaping filter factor, and then the wireless communication OTFS signal is FIR filtered using the superimposed filter factor, and the FIR filter coefficients are adaptively adjusted during the process of restoring the original code stream, so as to eliminate the in-band flatness of the channel, and further realize automatic frequency response compensation of a large-bandwidth OTFS signal receiving channel, improve the receiving quality of OTFS communication, and provide technical support for the research and development of OTFS communication equipment and measuring instruments. Description of the Drawings

[0048] Figure 1 It is a structural block diagram of the automatic frequency response compensation device for a large-bandwidth OTFS signal receiving channel of the present invention. Detailed Embodiment

[0049] For the convenience of those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0050] Figure 1 This is the structural block diagram of the automatic frequency response compensation device for the large-bandwidth OTFS signal receiving channel of the present invention, including a down-conversion unit, an A / D acquisition unit, an IQ demodulation unit, a decimation filtering unit, an FIR filtering unit, a CP elimination unit, an M-point FFT unit, an M-point IFFT unit, an N-point FFT unit, a digital demodulation unit, a digital modulation unit, an ISSFT transformation unit, a unit for obtaining group delay and frequency response error information, a unit for setting the h factor of the shaping filter, an M-point DFT unit, a unit for eliminating group delay and frequency response error information, and a unit for converting the filtering factor;

[0051] The down-conversion unit down-converts the input OTFS signal to generate an intermediate-frequency signal and sends it to the A / D acquisition unit;

[0052] The A / D acquisition unit digitizes the intermediate-frequency signal to generate an OTFS digital signal with carrier characteristics and sends it to the IQ demodulation unit;

[0053] The IQ demodulation unit performs IQ demodulation processing on the OTFS digital signal according to the local digital local oscillator signal to form a first OTFS digital IQ signal and sends it to the decimation filtering unit;

[0054] The decimation filtering unit resamples and filters the first OTFS digital IQ signal according to the communication data rate requirement of the OTFS digital signal to generate a second OTFS digital IQ signal that meets the communication data rate requirement and sends it to the FIR filtering unit;

[0055] The FIR filtering unit performs FIR filtering on the second OTFS digital IQ signal according to the filtering factor fed back by the M-point DFT unit to obtain a third OTFS digital IQ signal and sends it to the CP elimination unit;

[0056] The CP elimination unit sets the CP parameters according to the wireless communication OTFS signal, removes the protection time slot data of the third OTFS digital IQ signal, forms a fourth OTFS digital IQ signal and sends it to the M-point FFT unit;

[0057] The M-point FFT unit performs an M-point FFT transformation on the fourth OTFS digital IQ signal to convert the time-domain signal into a time-frequency domain signal, forming an X TF [N,M] OTFS time-frequency domain signal and sends it to the M-point IFFT unit and the unit for obtaining group delay and frequency response error information; where M is the number of subcarriers and N is the number of signal time slots;

[0058] The M-point IFFT unit performs an M-point IFFT transformation on the X TF [N,M] OTFS time-frequency domain signal to form an XTD [N,M] OTFS time-delay domain signal and send it to the N-point FFT unit;

[0059] The N-point FFT unit performs an N-point FFT transformation on the X TD [N,M] OTFS time-delay domain signal to form an X DD [N,M] OTFS time-delay Doppler domain signal and send it to the digital demodulation unit;

[0060] The digital demodulation unit demodulates the X DD [N,M] OTFS time-delay Doppler domain digital signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal to obtain the original code stream signal with in-band frequency response compensation of the receiving channel completed; the original code stream signal is output as a result and sent to the digital modulation unit at the same time;

[0061] The digital modulation unit modulates the original code stream signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal to generate a theoretical modulation signal and send it to the ISSFT transformation unit;

[0062] The ISSFT transformation unit maps the theoretical modulation signal onto the time-delay Doppler domain matrix to obtain a theoretical OTFS time-delay Doppler domain signal; then converts the theoretical OTFS time-delay Doppler domain signal into a theoretical OTFS time-frequency domain signal and sends it to the unit for obtaining group delay and frequency response error information;

[0063] The unit for obtaining group delay and frequency response error information compares and calculates the theoretical OTFS time-frequency domain signal with the X TF [N,M] OTFS time-frequency domain signal to generate frequency response error data in the frequency domain and group delay error data in the time delay and send them to the unit for eliminating group delay and frequency response error information;

[0064] The unit for setting the shaping filter h factor generates a shaping filter h factor according to the shaping filter parameters of the OTFS digital signal s(i) and sends it to the M-point DFT unit; the M-point DFT unit performs an M-point DFT transformation on the shaping filter h factor to convert it into an initial shaping filter amplitude-frequency response and an initial shaping filter group delay response and sends them to the unit for eliminating group delay and frequency response error information;

[0065] The unit for eliminating group delay and frequency response error information superimposes the frequency response error data on the initial shaping filter amplitude-frequency response and superimposes the group delay error data on the initial shaping filter group delay response to obtain a shaping filter amplitude-frequency response with error compensation data and a shaping filter group delay response and sends them to the unit for converting the filter factor;

[0066] The conversion filter factor unit converts the amplitude-frequency response and group delay response of the shaping filter with error compensation data into filter factors and sends them to the FIR filter unit to complete the in-band frequency response compensation of the receiving channel.

[0067] The automatic frequency response compensation method for the large bandwidth OTFS signal receiving channel based on the above device includes the following steps:

[0068] Step 1: Down-convert the wireless communication OTFS signal r(t) to generate an intermediate frequency signal m(t);

[0069] Step 2: Digitize the intermediate frequency signal m(t) to generate an OTFS digital signal s(i) with carrier characteristics;

[0070] Step 3: Perform IQ demodulation on the OTFS digital signal s(i) to form the first OTFS digital IQ signal:

[0071] S I (i) = s(i) * cos(ω c T s )

[0072] S Q (i) = s(i) * sin(ω c T s )

[0073] Among them, S I (i) represents the first I-channel data, S Q (i) represents the first Q-channel data, i represents the serial number of the sampling point, ω c is the carrier angular frequency, T s is the sampling period;

[0074] Step 4: According to the communication data rate requirement of the OTFS digital signal s(i), perform signal resampling and filtering on the first OTFS digital IQ signal to generate a second OTFS digital IQ signal that meets the communication data rate requirement;

[0075] Step 5: Perform FIR filtering on the second OTFS digital IQ signal to compensate for the channel frequency response error and eliminate the group delay error introduced by the channel and the inter-symbol interference noise of the OTFS signal, and obtain the third OTFS digital IQ signal;

[0076] Step 6: Set the CP parameter according to the wireless communication OTFS signal r(t), remove the guard time slot data of the third OTFS digital IQ signal, and form the fourth OTFS digital IQ signal;

[0077] Step 7: Perform M-point FFT transformation on the fourth OTFS digital IQ signal to convert the time-domain signal into a time-frequency domain signal to form XTF [N,M] OTFS time-frequency domain signal; where M is the number of subcarriers and N is the number of signal time slots;

[0078] Step 8: Perform an M-point IFFT transformation on the X TF [N,M] OTFS time-frequency domain signal to form X TD [N,M] OTFS time-delay domain signal;

[0079] Step 9: Perform an N-point FFT transformation on the X TD [N,M] OTFS time-delay domain signal to form X DD [N,M] OTFS time-delay Doppler domain signal;

[0080] Step 10: Demodulate the X DD [N,M] OTFS time-delay Doppler domain digital signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal s(i) to obtain the original code stream signal that has completed the in-band frequency response compensation of the receiving channel.

[0081] In the said step 5, the FIR filtering method includes the following steps:

[0082] Step 11: Modulate the original code stream signal digitally according to the resource allocation and modulation characteristic requirements of the OTFS digital signal s(i) to generate a theoretical modulation signal;

[0083] Step 12: Map the theoretical modulation signal onto the time-delay Doppler domain matrix to obtain a theoretical OTFS time-delay Doppler domain signal; then convert the theoretical OTFS time-delay Doppler domain signal into a theoretical OTFS time-frequency domain signal;

[0084] Step 13: Compare and operate the theoretical OTFS time-frequency domain signal with the X TF [N,M] OTFS time-frequency domain signal to generate frequency response error data in the frequency domain and group delay error data in the time delay;

[0085] Step 14: Generate a shaping filter h factor according to the shaping filter parameters of the OTFS digital signal s(i); this shaping filter h factor is used to eliminate the inter-symbol interference of the OTFS signal;

[0086] Step 15: Perform an M-point DFT transformation on the shaping filter h factor to convert it into an initial shaping filter amplitude-frequency response and an initial shaping filter group delay response;

[0087] Step 16: Superimpose the frequency response error data onto the amplitude-frequency response of the initial shaping filter, and superimpose the group delay error data onto the group delay response of the initial shaping filter to obtain the amplitude-frequency response of the shaping filter with error compensation data and the group delay response of the shaping filter; where, at the initial working time, that is, when no original code stream signal is generated, the frequency response error data and the group delay error are set to 0;

[0088] Step 17: Convert the amplitude-frequency response of the shaping filter with error compensation data and the group delay response of the shaping filter into filter factors, and perform FIR filtering on the second OTFS digital IQ signal to complete the in-band frequency response compensation work of the receiving channel.

[0089] The method and device for automatically compensating the frequency response of a large-bandwidth OTFS signal receiving channel provided by the present invention can realize the automatic compensation of the frequency response of a large-bandwidth OTFS signal receiving channel, improve the receiving quality of OTFS communication, and provide technical support for the research and development of OTFS communication equipment and measuring instruments.

Claims

1. A method for automatically compensating the frequency response of a large bandwidth OTFS signal receiving channel, characterized in that: The following steps are involved: Step 1: Down-convert the wireless communication OTFS signal r(t) to generate an intermediate frequency signal m(t); Step 2: Digitize the intermediate frequency signal m(t) to generate an OTFS digital signal s(i) with carrier characteristics; Step 3: Perform IQ demodulation on the OTFS digital signal s(i) to form a first OTFS digital IQ signal: Step 4: According to the communication data rate requirement for the OTFS digital signal s(i), the first OTFS digital IQ signal is resampled and filtered to generate a second OTFS digital IQ signal that meets the communication data rate requirement; Step 5: Perform FIR filtering on the second OTFS digital IQ signal to compensate for the channel frequency response error and eliminate the group delay error introduced by the channel and the OTFS signal inter-symbol interference noise to obtain a third OTFS digital IQ signal; Step 6: Setting the CP parameter according to the wireless communication OTFS signal r(t), removing the protection time slot data of the third OTFS digital IQ signal, and forming a fourth OTFS digital IQ signal; Step 7: Perform an M-point FFT transformation on the fourth OTFS digital IQ signal to convert the time domain signal into a time-frequency domain signal to form X TF [N,M] OTFS time-frequency domain signal; where M is the number of subcarriers and N is the number of signal time slots; Step 8: Place the X TF [N,M]OTFS time-frequency domain signal is transformed by M-point IFFT to form X TD [N,M] OTFS delay domain signal; Step 9: Place the X TD [N,M] OTFS delay domain signal is transformed by N points FFT to form X DD [N,M] OTFS delay-Doppler domain signal; Step 10: Place the X DD The [N,M]OTFS delay-Doppler domain digital signal is digitally demodulated according to the resource allocation and modulation characteristic requirements of the OTFS digital signal s(i) to obtain the original code stream signal with the in-band frequency response compensation of the receiving channel.

2. The method for automatically compensating the frequency response of a large bandwidth OTFS signal receiving channel according to claim 1, characterized in that: In step 5, the FIR filtering method includes the following steps: Step 11: digitally modulate the original code stream signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal s(i) to generate a theoretical modulation signal; Step 12: Map the theoretical modulated signal to the delay-Doppler domain matrix to obtain the theoretical OTFS delay-Doppler domain signal; then convert the theoretical OTFS delay-Doppler domain signal into the theoretical OTFS time-frequency domain signal; Step 13: Compare the theoretical OTFS time-frequency domain signal with X TF [N,M] OTFS time-frequency domain signals are compared and operated to generate frequency response error data from the frequency domain and group delay error data from the time delay; Step 14: Generate a shaping filter h factor according to the shaping filter parameters of the OTFS digital signal s(i); the shaping filter h factor is used to eliminate the OTFS signal inter-symbol interference; Step 15: Perform M-point DFT transformation on the shaping filter h factor to convert it into the initial shaping filter amplitude-frequency response and the initial shaping filter group delay response; Step 16: superimposing the frequency response error data to the initial shaping filter amplitude-frequency response, and superimposing the group delay error data to the initial shaping filter group delay response, to obtain the shaping filter amplitude-frequency response and shaping filter group delay response with error compensation data; wherein, in the initial operation, that is, when the original code stream signal is not generated, the frequency response error data and the group delay error are set to 0; Step 17: Convert the shaping filter amplitude-frequency response and shaping filter group delay response with error compensation data into filter factors, perform FIR filtering on the second OTFS digital IQ signal, and complete the in-band frequency response compensation of the receiving channel.

3. A frequency response automatic compensation device for a large bandwidth OTFS signal receiving channel, characterized in that: It includes a down-conversion unit, an A / D acquisition unit, an IQ demodulation unit, an extraction filter unit, an FIR filter unit, a CP elimination unit, an M-point FFT unit, an M-point IFFT unit, an N-point FFT unit, a digital demodulation unit, a digital modulation unit, an ISSFT transformation unit, a unit for obtaining group delay and frequency response error information, a unit for setting a shaping filter h factor, an M-point DFT unit, a unit for eliminating group delay and frequency response error information, and a conversion filter factor unit; The down-conversion unit down-converts the input OTFS signal to generate an intermediate frequency signal and sends it to the A / D acquisition unit; The A / D acquisition unit digitizes the intermediate frequency signal, generates an OTFS digital signal with carrier characteristics and sends it to the IQ demodulation unit; The IQ demodulation unit performs IQ demodulation processing on the OTFS digital signal according to the local digital local oscillator signal to form a first OTFS digital IQ signal and sends it to the extraction filter unit; The extraction and filtering unit resamples and filters the first OTFS digital IQ signal according to the communication data rate requirement of the OTFS digital signal, generates a second OTFS digital IQ signal that meets the communication data rate requirement, and sends the second OTFS digital IQ signal to the FIR filtering unit; The FIR filtering unit performs FIR filtering on the second OTFS digital IQ signal according to the filtering factor fed back by the M-point DFT unit to obtain a third OTFS digital IQ signal and sends it to the CP elimination unit; The CP elimination unit sets the CP parameter according to the wireless communication OTFS signal, removes the protection time slot data of the third OTFS digital IQ signal, forms a fourth OTFS digital IQ signal and sends it to the M-point FFT unit; The M-point FFT unit performs an M-point FFT transformation on the fourth OTFS digital IQ signal to convert the time domain signal into a time-frequency domain signal to form an X TF [N,M]OTFS time-frequency domain signal and sent to the M-point IFFT unit and the unit for obtaining group delay and frequency response error information; wherein M is the number of subcarriers and N is the number of signal time slots; The M-point IFFT unit converts X TF [N,M]OTFS time-frequency domain signal is transformed by M-point IFFT to form X TD [N,M] OTFS delay domain signal and send it to the N-point FFT unit; The N-point FFT unit converts X TD [N,M] OTFS delay domain signal is transformed by N points FFT to form X DD [N,M]OTFS delay-Doppler domain signal and send it to the digital demodulation unit; The digital demodulation unit converts X DD [N,M] The OTFS delay-Doppler domain digital signal is digitally demodulated according to the resource allocation and modulation characteristic requirements of the OTFS digital signal to obtain an original code stream signal that has completed the in-band frequency response compensation of the receiving channel; the original code stream signal is output as a result and sent to the digital modulation unit at the same time; The digital modulation unit digitally modulates the original code stream signal according to the resource allocation and modulation characteristic requirements of the OTFS digital signal, generates a theoretical modulation signal and sends it to the ISSFT conversion unit; The ISSFT transformation unit maps the theoretical modulated signal to the delay-Doppler domain matrix to obtain the theoretical OTFS delay-Doppler domain signal; then converts the theoretical OTFS delay-Doppler domain signal into the theoretical OTFS time-frequency domain signal and sends it to the unit for obtaining group delay and frequency response error information; The unit for obtaining group delay and frequency response error information compares the theoretical OTFS time-frequency domain signal with X TF [N,M] OTFS time-frequency domain signals are compared and operated, frequency response error data is generated from the frequency domain, group delay error data is generated from the time delay, and the data are sent to the group delay elimination and frequency response error information unit; The shaping filter h factor setting unit generates a shaping filter h factor according to the shaping filter parameters of the OTFS digital signal s(i) and sends it to the M-point DFT unit; the M-point DFT unit performs an M-point DFT transformation on the shaping filter h factor, converts it into an initial shaping filter amplitude-frequency response and an initial shaping filter group delay response, and sends it to the group delay elimination and frequency response error information elimination unit; The group delay and frequency response error elimination unit adds the frequency response error data to the initial shaping filter amplitude-frequency response, and adds the group delay error data to the initial shaping filter group delay response, obtains the shaping filter amplitude-frequency response and shaping filter group delay response with error compensation data, and sends them to the conversion filter factor unit; The conversion filter factor unit converts the shaping filter amplitude-frequency response and shaping filter group delay response with error compensation data into filter factors and sends them to the FIR filter unit to complete the in-band frequency response compensation of the receiving channel.

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