DMT signal millimeter wave communication perception system and method with high time-frequency domain resource utilization

Abstract

The invention relates to millimeter wave communication perception technology, and discloses a millimeter wave communication perception system and method for a DMT signal with high time-frequency domain resource utilization rate; the millimeter wave communication perception ranging integrated system of the invention comprises: a transmitting end, a receiving end and a signal processing algorithm, the transmitting end mainly comprises an input module, an optical modulator, a laser source, a photoelectric detector and a DAC module; the laser source is used as a light source; the input module is used to generate a communication perception integrated signal; the information generated by the optical modulator input module is modulated onto an optical carrier; the photoelectric detector is used to generate a millimeter wave signal; the receiving end mainly comprises an antenna, a demodulator and an output module; the antenna is used to receive the millimeter wave signal and output it to a demodulator for demodulation at a communication end and a perception end respectively; the output module is used to extract information demodulated by the demodulator; the system of the invention can not only realize the hardware combination of a millimeter wave frequency band communication system and a perception system, but also realize high-precision perception and high-speed communication.

Description

Technical Field

[0001] The present invention relates to a millimeter wave communication perception transmission technology of a DMT signal with high time-frequency domain resource utilization, and in particular to a millimeter wave communication perception system and method of a DMT signal with high time-frequency domain resource utilization. Background Art

[0002] Entering the 5G era, with the rapid development of communication technology, ultra-high-speed, ultra-connected and ultra-low latency communication applications have become more and more widespread. Nowadays, people are paying more and more attention to the combination of communication and perception functions. Looking back at the communication methods in the past, communication and perception functions are often separated, which makes it impossible for the sender to obtain the feedback information provided by the perception function in real time, which in turn affects the efficiency of communication. Therefore, if the communication and perception functions can be effectively integrated on one device, the communication quality of the system will be greatly improved. Looking to the future, with the gradual application of 6G technology, this integration method will show great development potential in the fields of unmanned driving and remote control. Summary of the invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a millimeter wave communication and perception integrated system and method for DMT signals with high time-frequency domain resource utilization, so as to realize high-speed and high-reliability communication while sharing the hardware resources of perception and communication equipment. Compared with the separation of traditional communication and sensing function equipment, the cost can be significantly reduced.

[0004] Technical solution:

[0005] In the first aspect, a millimeter wave communication perception system of a DMT signal with high time-frequency domain resource utilization includes: a transmitting end, a receiving end and a signal processing algorithm;

[0006] The transmitter mainly includes an input module, an optical modulator, a laser source, a photodetector, and a digital-to-analog converter; the laser source is generated by a laser generator; the input module is composed of an arbitrary waveform generator for generating communication perception integrated signals; the optical modulator modulates the information generated by the input module onto an optical carrier; the photodetector is used to generate millimeter wave signals;

[0007] The receiving end mainly includes an antenna, a demodulator and an output module; the antenna is used to receive millimeter wave signals and output them to the demodulator for demodulation at the communication end and the sensing end respectively; the output module is used to extract the information demodulated by the demodulator.

[0008] In a further embodiment, the transmitting end includes two external cavity laser generators, which generate two continuous wave optical signals with a certain frequency difference, which are coupled and used as optical carriers at the same time; MATLAB software is used to generate a DMT communication perception integrated signal in the digital domain, and the arbitrary waveform generator and DAC module perform digital-to-analog conversion on the digital signal; the analog signal after the digital-to-analog conversion is divided into two paths, one of which is used as a communication perception signal, which is amplified by an electrical amplifier and then drives an optical intensity modulator to modulate the DMT signal on two optical carriers at the same time; the other path is used as a perception reference signal and is directly sent to an oscilloscope; the two modulated optical signals are passed through a photoelectric detector to complete the beat frequency and generate a DMT signal in the millimeter wave band.

[0009] In a further embodiment, the receiving end is a sensing receiving end, which down-converts the echo reflected by the detected target to baseband through an envelope detector and collects it by an oscilloscope; the receiving end uses a digital signal processing algorithm, combines the reference signal and the echo signal, and calculates the signal phase change to calculate the distance information and speed information of the detected target.

[0010] In a further embodiment, the signal processing algorithm is as follows:

[0011] The DMT integrated signal generation is completed through bit signal generation, serial signal conversion to parallel signal, QAM modulation, conjugate transposition, inverse Fourier transform, adding cyclic prefix CP, parallel signal conversion to serial signal, adding training sequence, and after the signal passes through the channel, the preliminary signal processing is completed through signal synchronization, resampling, removal of training sequence and CP, serial signal conversion to parallel signal, and Fourier transform. Both the communication algorithm and the perception algorithm need to implement the above algorithms;

[0012] For the perception algorithm, the perception function is completed by point-wise division of the echo signal frequency domain data with the reference signal frequency domain data, speed dimension Fourier transform, distance dimension inverse Fourier transform, and distance and speed information extraction. For the communication algorithm, the communication function is completed by channel equalization, frequency domain averaging between symbols, and calculating the signal bit error rate.

[0013] In a further embodiment, a DMT signal is used for both communication and perception, so that the signal can be frequency-division and time-division multiplexed at the same time, and a broadband DMT signal can be generated, thereby improving the time-frequency domain resource utilization of the system.

[0014] In a further embodiment, an optical heterodyne method is used to couple two optical signals with a certain frequency difference into one optical signal, which is modulated by MZM to assist PD beat frequency in generating a high-frequency millimeter wave signal.

[0015] In a further embodiment, the multi-carrier DMT signal serves as both a communication signal and a perception signal.

[0016] In a second aspect, a millimeter wave communication sensing method for a DMT signal with high time-frequency domain resource utilization is implemented using the above-mentioned millimeter wave communication sensing system, comprising the following steps:

[0017] At the transmitting end, the optical carriers output by the external cavity laser generators ECL1 and ECL2 with a certain frequency difference are coupled and used as optical carriers at the same time. The input module AWG generates a DMT signal and converts it into an analog signal through the digital-to-analog converter DAC module 1 and the digital-to-analog converter DAC module 2. The DMT signal sent by the digital-to-analog converter DAC module 1 is directly input into the transmitting end oscilloscope as a reference signal. The DMT signal sent by the digital-to-analog converter DAC module 2 is amplified by an electrical amplifier and modulated on the coupled optical carrier by the optical modulator MZM.

[0018] The modulated coupled optical carrier is used to adjust the power before entering the PD through an adjustable optical attenuator. Then the above signal enters the photodetector PD to complete the beat frequency;

[0019] The PD beat frequency completes the photoelectric conversion to obtain the DMT signal in the millimeter wave band, and the generation of the communication perception signal has been completed;

[0020] The above signal transmission antennas converge and send them into the wireless channel;

[0021] At the communication receiving end, the communication signal is demodulated after 50 meters of wireless transmission, and the demodulation method is consistent with the modulation method;

[0022] In the sensing part of the transmitter, the reflected ranging signal is received through the antenna;

[0023] A reflected signal is amplified by a low noise amplifier and down-converted into a baseband signal by an envelope detector;

[0024] By using the reference signal directly acquired and the echo signal received, the distance information and speed information of the echo signal are extracted through the digital signal processing algorithm;

[0025] At this point, the system has completed the perception, ranging and communication functions.

[0026] Beneficial effects: Compared with the prior art, the implementation of the present invention utilizes optical heterodyne beat frequency to generate DMT millimeter wave signals with high time-frequency domain resource utilization, realizing the integration of perception and communication equipment hardware resources. Compared with the LFM-OFDM millimeter wave communication perception system and method of frequency division multiplexing and time division multiplexing, this solution calculates the distance and speed information of the target through a digital signal processing algorithm, improves the time-frequency domain resource utilization of the system, avoids the complex structure of the optical domain de-chirping equipment, and also meets the trend of the integration of high-frequency communication functions and radar functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the millimeter wave communication perception system architecture of DMT signals with high time-frequency domain resource utilization proposed by the present invention.

[0028] The numbers in the figure are: 1 is the laser generator ECL1, 2 is the laser generator ECL2, 3 is the optical coupler PM-OC, 4 is the optical modulator MZM, 5 is the electric amplifier EA, 6 is the digital-to-analog converter DAC2, 7 is the arbitrary waveform generator (AWG), 8 is the digital-to-analog converter DAC1, 9 is the single-mode optical fiber, 10 is the adjustable optical attenuator VOA, 11 is the photodetector PD, 12 is the transmitting antenna HA1, 13 is the receiving antenna HA2, 14 is the envelope detector ED1, 15 is the oscilloscope OSC1, 16 is the detected target, 17 is the low noise amplifier LNA, 18 is the receiving antenna HA3, 19 is the envelope detector ED2, and 20 is the oscilloscope OSC2.

[0029] Figure 2 It is a flowchart of the millimeter wave communication perception algorithm for DMT signals with high time-frequency domain resource utilization.

[0030] Numbers in the figure: 1 is bit signal generation, 2 is serial signal to parallel signal conversion, 3 is QAM modulation, 4 is conjugate transpose, 5 is inverse Fourier transform, 6 is adding cyclic prefix (CP), 7 is parallel signal to serial signal conversion, 8 is adding training sequence, 9 is passing through the channel, 10 is signal synchronization, 11 is resampling, 12 is removing training sequence and CP, 13 is serial signal to parallel signal conversion, 14 is Fourier transform, 15 is the point division of echo signal frequency domain data and reference signal frequency domain data, 16 is speed dimension Fourier transform, 17 is distance dimension inverse Fourier transform, 18 is distance and speed information extraction, 19 is channel equalization, 20 is frequency domain averaging between symbols, and 21 is calculation of signal bit error rate. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] A millimeter wave communication sensing system for DMT signals with high time-frequency domain resource utilization, comprising: a transmitting end, a receiving end and a signal processing algorithm;

[0034] The transmitter mainly includes an input module, an optical modulator, a laser source, a photodetector, and a DAC module; the laser source is generated by a laser generator; the input module is used to generate a communication sensing integrated signal; the optical modulator modulates the information generated by the input module onto an optical carrier; the photodetector is used to generate a millimeter wave signal;

[0035] The receiving end mainly includes an antenna, a demodulator and an output module; the antenna is used to receive millimeter wave signals and output them to the demodulator for demodulation at the communication end and the sensing end respectively; the output module is used to extract the information demodulated by the demodulator.

[0036] In one embodiment, Figure 1 As shown, the transmitting end includes two external cavity laser generators, which generate two continuous wave optical signals with a certain frequency difference, which are coupled and used as optical carriers at the same time; MATLAB software is used to generate DMT communication perception integrated signal in the digital domain, and the arbitrary waveform generator and DAC module perform digital-to-analog conversion on the digital signal; the analog signal after digital-to-analog conversion is divided into two paths, one of which is used as a communication perception signal, which is amplified by an electric amplifier and then drives an optical intensity modulator to modulate the DMT signal on two optical carriers at the same time; the other path is used as a perception reference signal and is directly sent to an oscilloscope; the two modulated optical signals are passed through a photoelectric detector to complete the beat frequency to generate a DMT signal in the millimeter wave band.

[0037] Specific

[0038] In one embodiment, Figure 1 As shown, the receiving end is a sensing receiving end, which down-converts the echo reflected by the detected target to baseband through an envelope detector and collects it by an oscilloscope; the receiving end uses a digital signal processing algorithm, combines the reference signal and the echo signal, and calculates the signal phase change to calculate the distance information and speed information of the detected target.

[0039] In one embodiment, Figure 1 As shown, the signal processing algorithm is as follows:

[0040] The DMT integrated signal generation is completed through bit signal generation, serial signal conversion to parallel signal, QAM modulation, conjugate transposition, inverse Fourier transform, adding cyclic prefix CP, parallel signal conversion to serial signal, adding training sequence, and after the signal passes through the channel, the preliminary signal processing is completed through signal synchronization, resampling, removal of training sequence and CP, serial signal conversion to parallel signal, and Fourier transform. Both the communication algorithm and the perception algorithm need to implement the above algorithms;

[0041] For the perception algorithm, the perception function is completed by point-wise division of the echo signal frequency domain data with the reference signal frequency domain data, speed dimension Fourier transform, distance dimension inverse Fourier transform, and distance and speed information extraction. For the communication algorithm, the communication function is completed by channel equalization, frequency domain averaging between symbols, and calculating the signal bit error rate.

[0042] In one embodiment, Figure 1 As shown, the DMT signal used for both communication and perception is adopted, so that the signal can realize frequency division and time division multiplexing at the same time, and can generate a broadband DMT signal, thereby improving the utilization rate of the system's time and frequency domain resources.

[0043] In one embodiment, Figure 1 As shown, using the optical heterodyne method, two optical signals with a certain frequency difference are coupled into one optical signal, which is modulated by the MZM and assisted by the PD beat frequency to generate a high-frequency millimeter-wave signal.

[0044] In one embodiment, Figure 1 As shown, the multi-carrier DMT signal serves as both a communication signal and a perception signal.

[0045] In one embodiment, Figure 1 As shown, the communication and perception functions can use devices with the same architecture, which reduces the design overhead of system integration and reduces the waste of hardware resources.

[0046] In one embodiment, Figure 1 The following is the millimeter wave communication perception system architecture of DMT signals with high time-frequency domain resource utilization:

[0047] At the transmitting end, ECL1 (1) and ECL2 (2) operating at different frequencies generate two optical signals, and an optical coupler (3) combines the optical carriers into one optical signal. The DMT data generated offline can be expressed as:

[0048]

[0049] Where L is the number of DMT symbols, N is the number of subcarriers, T sym is the duration of a DMT signal, f k is the kth subcarrier frequency, Xl ,k is the QAM signal modulated on the kth subcarrier in the lth DMT symbol. After passing through the arbitrary waveform generator (7), it is divided into two identical data paths. The first path becomes an analog signal after passing through the analog-to-digital converter DAC1 (8) and is sent to the oscilloscope OSC2 (26) as a reference signal at the sensing end. The second path becomes an analog signal after passing through the digital-to-analog converter DAC2 (6), and drives the optical modulator MZM (4) through the electrical amplifier EA (5). The modulated optical signal is adjusted in optical power through the single-mode optical fiber SMF (9) and the adjustable optical attenuator VOA (10). After being beat by the photodetector PD (11), the optical signal is converted into a millimeter wave signal. The DMT interaceptive integrated signal has been successfully generated and is emitted into free space after being converged by the transmitting antenna HA1 (12).

[0050] At the communication end, the signal is gathered by the receiving antenna HA2 (13) and enters the RF circuit. The communication millimeter wave signal is down-converted to baseband through the envelope detector ED1 (14) and collected by the oscilloscope OSC1 (15). The demodulation method of the collected communication signal corresponds to the modulation method.

[0051] At the sensing end, the echo signal from the detected target (16) is received by the receiving antenna (17), and the sensing millimeter wave signal is down-converted to baseband by the envelope detector ED2 (19) through the low noise amplifier LNA (18). The signal can be expressed by the following formula:

[0052]

[0053] Where M is the number of reflected echoes, c m is the mth reflected echo intensity, τ m is the delay of the mth reflected echo, f D,m is the Doppler frequency of the mth reflected echo, The random phase added to the mth reflected echo, z(t) is the Gaussian white noise of the system. m and Doppler frequency f D,m The calculation formulas are:

[0054]

[0055]

[0056] Among them, d m is the straight-line distance between the mth target and the signal receiving and transmitting end, v m The radial velocity of the mth target distance signal receiving and transmitting end, f c is the center frequency of the millimeter wave. The signal is then collected by an oscilloscope OSC2 (20), and the distance and speed information of the detected target is extracted through a digital signal processing algorithm with the help of a reference signal.

[0057] Embodiment 2:

[0058] A millimeter wave communication sensing method for a DMT signal with high time-frequency domain resource utilization is implemented using the above-mentioned millimeter wave communication sensing system, comprising the following steps:

[0059] At the transmitting end, the optical carriers output by the external cavity laser generators ECL1 and ECL2 with a certain frequency difference are coupled and used as optical carriers at the same time. The input module AWG generates a DMT signal and converts it into an analog signal through the DAC module 1 and the DAC module 2. The DMT signal sent by the DAC module 1 is directly input into the oscilloscope at the transmitting end as a reference signal. The DMT signal sent by the DAC module 2 is amplified by the electrical amplifier and modulated on the coupled optical carrier through the optical modulator MZM.

[0060] The modulated coupled optical carrier is used to adjust the power before entering the PD through an adjustable optical attenuator. Then the above signal enters the photodetector PD to complete the beat frequency;

[0061] The PD beat frequency completes the photoelectric conversion to obtain the DMT signal in the millimeter wave band, and the generation of the communication perception signal has been completed;

[0062] The above signal transmission antennas converge and send them into the wireless channel;

[0063] At the communication receiving end, the communication signal is demodulated after 50 meters of wireless transmission, and the demodulation method is consistent with the modulation method;

[0064] In the sensing part of the transmitter, the reflected ranging signal is received through the antenna;

[0065] A reflected signal is amplified by a low noise amplifier and down-converted into a baseband signal by an envelope detector;

[0066] By using the reference signal directly acquired and the echo signal received, the distance information and speed information of the echo signal are extracted through the digital signal processing algorithm;

[0067] At this point, the system has completed the perception, ranging and communication functions.

[0068] In one embodiment, Figure 2 The algorithm flow chart of the millimeter wave communication perception system of the DMT signal with high time-frequency domain resource utilization is shown, which includes:

[0069] At the transmitting end, step (1) generates a bit signal for communication, and step (2) converts the parallel signal into a serial signal. Step (3) converts the bit signal into a QAM signal. In order to obtain a scalar signal that can be used for transmission in a scalar system, step (4) conjugates and transposes the QAM signal. The signal matrix can be expressed as:

[0070]

[0071] Then, the signal is converted into a time domain signal by inverse Fourier transform in step (5). Step (6) reduces the inter-symbol interference of the system by adding CP, and step (7) converts the signal from parallel to serial signal for easy transmission. Step (8) adds a training sequence for synchronization and channel estimation. After the signal is transmitted through the channel in step (9), it is collected by an oscilloscope. The signal is synchronized through step (10), and step (11) completes signal resampling to adapt to the signal transmission rate. Step (12) removes CP and training sequence, step (13) converts the serial signal into a parallel matrix, and step (14) converts the time domain signal into a frequency domain signal after Fourier transform. The communication part and the perception part are processed in the same way in steps (10)-(14).

[0072] In the perception part, the signal after step (14) can be expressed as:

[0073]

[0074] Where T0 is the duration of a complete DMT symbol (including CP), Δf is the subcarrier spacing of the DMT signal, which can be expressed as Δf = 1 / T sym =Baud / N FFT Calculated, Baud is the baud rate, N FFT is the number of FFT points of a DMT signal, Z k,l Specifically, it is Gaussian white noise corresponding to the kth subcarrier of the lth DMT symbol. Step (15) divides the frequency domain data of the echo signal by the frequency domain data of the reference signal. Combining formula (5) and formula (6), the signal can be expressed as:

[0075]

[0076] The signal is then transformed into a sharp sinc function form by performing a velocity-dimensional Fourier transform in step (16) and an inverse distance-dimensional Fourier transform in step (17). The formula is:

[0077]

[0078] Through the peak position of the signal in formula (8), step (18) can be completed to extract distance and speed information. So far, the perception function of the system has been realized.

[0079] In the communication part, the echo signal is equalized by using the channel estimation matrix obtained by the training sequence in step (19), the frequency domain averaging between symbols is realized in step (20), and the signal bit error rate is calculated in step (21). At this point, the communication function of the system has been realized.

[0080] Working principle: Two external cavity lasers generate two continuous wave optical signals with a certain frequency difference, which are coupled and used as optical carriers at the same time. MATLAB software is used to generate DMT communication perception integrated signals in the digital domain, and the arbitrary waveform generator and DAC module perform digital-to-analog conversion on the digital signal. The analog signal after digital-to-analog conversion is divided into two paths. One path is used as a communication perception signal, which is amplified by an electrical amplifier and then drives the optical intensity modulator to modulate the DMT signal on two optical carriers at the same time. The other path is used as a perception reference signal and is sent directly to the oscilloscope. The two modulated optical signals pass through a photodetector to complete the beat frequency and generate a DMT signal in the millimeter wave band.

[0081] The sensing receiver uses an envelope detector to down-convert the echo reflected by the detected target to baseband and collects it with an oscilloscope. The receiver uses a digital signal processing algorithm to combine the reference signal and the echo signal, and calculates the signal phase change to calculate the distance and speed information of the detected target;

[0082] The communication and perception signal processing algorithms are shown below:

[0083] The baseband signal sequence of the transmitting end is generated. For the specific formula, see formula (1) in the "Specific Implementation Plan";

[0084] After being reflected by multiple targets, the time domain information and frequency domain information of the echo signal change. For the specific formula, see formula (2) in the "Specific Implementation Plan";

[0085] After Fourier transformation, the frequency domain information of the received signal is transformed. The specific formula is shown in formula (6) in the "Specific Implementation Plan";

[0086] Divide the reference signal element by element to extract the signal delay information and Doppler information. For the specific formula, see formula (7) in the "Specific Implementation Plan";

[0087] After the delay-Doppler matrix undergoes inverse Fourier transform in the distance dimension and Fourier transform in the velocity dimension, the delay information and Doppler information of the signal can be presented in a peak shape in the distance-Doppler dimension, which is convenient for extraction. The specific formula is shown in formula (8) in the "Specific Implementation Plan";

[0088] Thus, the distance information and speed information of the detected target are detected and obtained.

[0089] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A millimeter wave communication perception system for DMT signals with high time-frequency domain resource utilization, characterized in that: include: Transmitter, receiver and signal processing algorithms; The transmitter mainly includes input module, optical modulator, laser source, photodetector, and digital-to-analog converter; The laser source is a laser generator that generates a light source; the input module is composed of an arbitrary waveform generator and is used to generate a communication sensing integrated signal; the optical modulator modulates the information generated by the input module onto an optical carrier; the photodetector is used to generate a millimeter wave signal; The receiving end mainly includes an antenna, a demodulator and an output module; the antenna is used to receive millimeter wave signals and output them to the demodulator for demodulation at the communication end and the sensing end respectively; the output module is used to extract the information demodulated by the demodulator; The transmitting end includes two external cavity laser generators, which generate two continuous wave optical signals with a certain frequency difference, which are coupled and used as optical carriers at the same time; MATLAB software is used to generate DMT communication perception integrated signals in the digital domain, and the arbitrary waveform generator and the digital-to-analog converter DAC module perform digital-to-analog conversion on the digital signal; the analog signal after the digital-to-analog conversion is divided into two paths, one of which is used as a communication perception signal, which is amplified by an electrical amplifier and then drives an optical intensity modulator to modulate the DMT signal on two optical carriers at the same time; the other path is used as a perception reference signal and is directly sent to an oscilloscope; The two modulated optical signals pass through the photodetector to complete the beat frequency and generate the DMT signal in the millimeter wave frequency band; The receiving end is a sensing receiving end, which down-converts the echo reflected by the detected target to baseband through an envelope detector and collects it through an oscilloscope; the receiving end uses a digital signal processing algorithm, combines the reference signal and the echo signal, and calculates the signal phase change to calculate the distance information and speed information of the detected target; The signal processing algorithm is as follows: The DMT integrated signal generation is completed through bit signal generation, serial signal conversion to parallel signal, QAM modulation, conjugate transposition, inverse Fourier transform, adding cyclic prefix CP, parallel signal conversion to serial signal, adding training sequence, and after the signal passes through the channel, the preliminary signal processing is completed through signal synchronization, resampling, removal of training sequence and CP, serial signal conversion to parallel signal, and Fourier transform. Both the communication algorithm and the perception algorithm need to implement the above algorithms; For the perception algorithm, the perception function is completed by point-wise division of the echo signal frequency domain data with the reference signal frequency domain data, speed dimension Fourier transform, distance dimension inverse Fourier transform, and distance and speed information extraction. For the communication algorithm, the communication function is completed by channel equalization, frequency domain averaging between symbols, and calculating the signal bit error rate.

2. According to the millimeter wave communication perception system of DMT signal with high time-frequency domain resource utilization rate according to claim 1, it is characterized in that: The DMT signal is used for both communication and perception, so that the signal can be frequency-division and time-division multiplexed at the same time, which can generate broadband DMT signals and improve the utilization rate of the system's time-frequency domain resources.

3. According to the millimeter wave communication perception system of DMT signal with high time-frequency domain resource utilization rate as described in claim 1, it is characterized in that: Using the optical heterodyne method, two optical signals with a certain frequency difference are coupled into one optical signal. After MZM modulation, the PD beat frequency is assisted to generate a high-frequency millimeter-wave signal.

4. According to the millimeter wave communication perception system of DMT signal with high time-frequency domain resource utilization rate as described in claim 1, it is characterized in that: Multi-carrier DMT signals serve as both communication signals and perception signals.

5. A millimeter wave communication perception method for DMT signals with high time-frequency domain resource utilization, characterized in that: The millimeter wave communication sensing system according to any one of claims 1 to 4 is used for implementation, comprising the following steps: At the transmitting end, the optical carriers output by the external cavity laser generators ECL1 and ECL2 with a certain frequency difference are coupled and used as optical carriers at the same time. The input module arbitrary waveform generator AWG generates a DMT signal and converts it into an analog signal through the digital-to-analog converter DAC module 1 and the digital-to-analog converter DAC module 2. The DMT signal sent by the digital-to-analog converter DAC module 1 is directly input into the transmitting end oscilloscope as a reference signal. The DMT signal sent by the digital-to-analog converter DAC module 2 is amplified by an electrical amplifier and modulated on the coupled optical carrier through the optical modulator MZM. The modulated coupled optical carrier is used to adjust the power before entering the PD through an adjustable optical attenuator, and then the above signal enters the photodetector PD to complete the beat frequency; The PD beat frequency completes the photoelectric conversion to obtain the DMT signal in the millimeter wave band, and the generation of the communication perception signal has been completed; The above signal transmission antennas converge and send them into the wireless channel; At the communication receiving end, the communication signal is demodulated after 50 meters of wireless transmission, and the demodulation method is consistent with the modulation method; In the sensing part of the transmitter, the reflected ranging signal is received through the antenna; A reflected signal is amplified by a low noise amplifier and down-converted into a baseband signal by an envelope detector; By using the reference signal directly acquired and the echo signal received, the distance information and speed information of the echo signal are extracted through the digital signal processing algorithm; At this point, the system has completed the perception, ranging and communication functions.

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