A simultaneous and same-frequency millimeter wave communication perception fusion system and method

Abstract

The present invention provides a simultaneous and co-frequency millimeter wave communication perception fusion system and method. The system includes a CU, a DU, n RUs, and m users corresponding to each RU. The communication perception fusion method first utilizes a photonics-assisted network architecture to up-convert perception and communication waveforms to millimeter wave frequencies. At the user end, a corresponding DSP algorithm eliminates interference from radar signals on communication signals and extracts communication signals from the communication perception waveform. At the radar receiving end, a de-chirping mechanism is used to extract perception information from the millimeter wave communication perception waveform. The radar and communication waveforms used are consistent with existing independent synaesthesia systems, requiring no specific modifications and easily compatible with existing synaesthesia algorithms. The simultaneous and co-frequency synaesthesia and perception fusion of millimeter wave signals improves system spectrum efficiency and avoids perception or communication interruptions. At the communication receiving end, a secondary de-skewing DSP algorithm is used to eliminate the impact of chirping in the perception waveform on communication.

Description

Technical Field

[0001] The present invention relates to the fields of optical millimeter wave technology, communication technology, and radar detection technology, and in particular to a simultaneous and same-frequency millimeter wave communication perception fusion system and method thereof. Background Art

[0002] In recent years, the booming growth of mobile applications such as short videos and online conferencing has created an urgent demand for ultra-high transmission rates. Consequently, mobile communications are moving towards the ultra-large capacity millimeter wave (mmW) and terahertz frequency bands. Furthermore, millimeter waves, due to their large bandwidth and narrow beamformation, offer ultra-high detection accuracy and are widely used in civilian radar. The application of millimeter waves in radar and mobile communications, coupled with the urgent need for high-precision sensing and high-speed wireless communications in emerging intelligent services, presents a powerful opportunity for the seamless integration of radar and wireless communications. Thanks to the wide bandwidth and low loss characteristics of photonics, optical millimeter wave communication sensing has become a research hotspot.

[0003] Currently, photonic-based communication and perception fusion technology solutions can be divided into three categories: the first is the independent integration of perception and communication units (1+1); the second is based on time division, frequency division, and other multiplexing methods; and the third is based on integrated waveforms. Each of these technical solutions has certain drawbacks. Independently integrated synaesthesia fusion systems can suffer from severe software and hardware redundancy; multiplexed synaesthesia systems face difficulties in synaesthesia resource management, synaesthesia crosstalk, and synaesthesia interruption; and integrated waveforms are easy to manage, but require changes to existing communication and radar waveforms and suffer from low spectral efficiency due to spectrum broadening. Summary of the Invention

[0004] To address a series of issues such as the aforementioned system's hardware and software redundancy, difficulty managing synaesthesia resources, changes to existing communication and radar waveforms, and low spectrum efficiency, the present invention proposes a simultaneous and co-frequency millimeter-wave communication perception fusion system and method. This invention first utilizes a photonics-assisted network architecture to up-convert simultaneous and co-frequency perception and communication waveforms to millimeter-wave frequencies. At the user end, the corresponding digital signal processing (DSP) algorithm is used to eliminate the interference of radar signals on communication signals, and the communication signal is extracted from the simultaneous and co-frequency millimeter-wave communication perception waveform. At the radar receiving end, a dechirping mechanism is used to extract perception information from the simultaneous and co-frequency millimeter-wave communication perception waveform. The specific technical solution is as follows:

[0005] A simultaneous and co-frequency millimeter wave communication perception fusion system includes a central unit (CU), distributed units (DU), n remote units (RU), and m user units (User) corresponding to each remote unit (RU). The central unit (CU) includes a coherent optical frequency comb generator (OFCG), a multi-channel optical filter (MOF), a simultaneous and co-frequency co-sensing sideband generator, an optical delay matching module, and an optical coupler (OC). The distributed unit (DU) includes an erbium-doped fiber amplifier (EDFA) and an optical splitter (OS) for power distribution. Each remote unit (RU) includes a photodetector (PD), a power amplifier (PA), two antennas (HA) for photoelectric conversion to generate millimeter wave signals for simultaneous and co-frequency communication perception fusion, and a radar dechirping module. Each user unit (User) includes an antenna (HA), an analog down-conversion module, a radar interference cancellation (DSP) algorithm, and a communication (DSP) algorithm. The central unit (CU), distributed units (DU), and remote units (RU) are connected via optical fiber, while the remote units (RU) and user units (User) are connected wirelessly. Wireless connection refers to connection via wireless electromagnetic waves, that is, no wired media such as optical fiber and cable are required. In the present invention, the electromagnetic waves emitted by the R remote unit U antenna are received by the user unit User antenna, thus achieving wireless connection.

[0006] A method for simultaneous and co-frequency millimeter-wave communication perception fusion is disclosed. The synaesthesia resource of the central unit (CU) undergoes a series of electrical and optical domain processing and is then transmitted to the distributed unit (DU) via a section of single-mode optical fiber (SMF). The distributed unit (DU) performs power compensation on the received optical signal and then distributes the optical power according to the requirements of each remote unit (RU). The optical signal distributed by the distributed unit (DU) is transmitted to the corresponding n remote units (RU) via n sections of single-mode optical fiber (SMF). Each remote unit (RU) converts the received optical signal into a simultaneous and co-frequency millimeter-wave synaesthesia fusion signal and transmits it to the m user units (User) corresponding to the remote unit (RU) via a wireless channel. Part of the signal transmitted by the remote unit (RU) is reflected back to the remote unit (RU) by the user to perceive each user unit (User), and the other part is received by the user antenna to communicate with each user unit (User).

[0007] Preferably, the specific working method of the central unit CU is as follows: first, the optical frequency comb generated by the coherent optical frequency comb generator OFCG is injected into the multi-channel optical filter MOF, and two coherent optical comb teeth with a specific frequency interval f are extracted and separated, which are used as the modulated light ML and the local oscillator light LO respectively; then, the modulated light ML is injected into a simultaneous and same-frequency synaesthesia sideband generator to generate a simultaneous and same-frequency communication perception fusion optical sideband CTCF-OSB; the local oscillator light LO is injected into an optical delay matching module, and the delay of the local oscillator light LO is tuned to ensure the coherence between the local oscillator light LO and the generated communication perception fusion optical sideband CTCF-OSB; finally, after delay matching, the local oscillator light LO and the communication perception fusion optical sideband CTCF-OSB are coupled together through an optical coupler OC; the coupled optical signal is transmitted to the distributed unit DU through the single-mode optical fiber SMF.

[0008] Preferably, the coherent optical frequency comb generator (OFCG) consists of an external cavity laser (ECL), a Mach-Zehnder modulator (MZM), and a radio frequency clock source. The multi-channel optical filter (MOF) is implemented by an optical interleaver (OIL), and the simultaneous co-frequency sideband generator is implemented by a pair of simultaneous co-frequency communication perception fusion signals driven by Hilbert transforms of the baseband or intermediate frequency IQ modulators.

[0009] Preferably, the specific working method of the distributed unit DU is as follows: in the nth DU, the received coherent optical signal is first input into the erbium-doped fiber amplifier EDFA for power compensation, and then divided into n paths by an optical splitter OS for multi-end resource allocation; the optical signal after branching by the optical splitter OS is transmitted to n remote units RU through n sections of single-mode optical fiber SMF respectively.

[0010] Preferably, the specific working method of the remote unit RU is as follows: in the nth remote unit RU, the received coherent optical signal is input into a photodetector PD for photoelectric conversion; according to the square law detection principle, the photodetector PD will generate a simultaneous and co-frequency communication perception fusion signal with a carrier frequency of f; by controlling the comb tooth spacing of the coherent optical frequency comb generator OFCG and the filtering characteristics of the multi-channel optical filter MOF, the frequency of the generated synaesthesia fusion signal is controlled at the millimeter wave frequency and continuously tuned; the simultaneous and co-frequency communication perception fusion signal generated by the photodetector PD is amplified by the power amplifier PA and radiated by the antenna HA to the air to perceive the surrounding users; the echo reflected by the user is received by the receiving antenna HAnc of the remote unit RU, and then radar dechirping is performed; at the same time, the mth user corresponding to the nth remote unit RU receives the simultaneous and co-frequency communication perception fusion signal through the antenna HAmb, and obtains the downlink communication information after analog down-conversion, radar interference elimination DSP, and communication DSP.

[0011] Preferably, the specific working method of the radar interference elimination DSP is as follows: first, the simultaneous co-frequency communication perception fusion signal after analog down-conversion is first converted to baseband through digital down-conversion and digital filtering, and the baseband simultaneous co-frequency communication perception fusion signal is then matched filtered with a backup radar signal to obtain the delay between the two and complete signal synchronization; then the synchronized baseband simultaneous co-frequency communication perception fusion signal and the backup radar signal are subjected to the first de-skew operation to achieve de-chirping of the radar waveform in the fusion signal; through the first de-skew processing, the communication signal will introduce radar chirp and DC components; the signal after the first de-skew is then subjected to the mean operation to eliminate the influence of the DC component introduced by the first de-skew operation; the communication signal obtained after DC removal is again subjected to the second de-skew operation with the backup radar signal to eliminate the radar chirp introduced by the first de-skew operation; at this point, the influence of the radar chirp on the communication signal is eliminated; the signal after the second de-skew is then subjected to the conventional communication DSP to restore the downlink communication information.

[0012] Preferably, the backup radar signal has the same bandwidth and time width as the radar signal loaded by the central unit CU.

[0013] Preferably, when the radar interference elimination DSP is performed in the intermediate frequency or radio frequency band, the first de-skewing operation will introduce a clock-like component instead of a DC component. This clock-like component is eliminated by narrowband filtering, or first down-converted to baseband and then eliminated by averaging.

[0014] Compared with the closest existing technology, the technical solution provided by the present invention has the following beneficial effects:

[0015] 1. The simultaneous and co-frequency modulation method saves spectrum resources by superimposing the same-spectrum synaesthesia signals in the frequency domain, thereby allowing more remote units (RUs) to be present within the limited spectral bandwidth. In addition, compared with the time-division multiplexing synaesthesia integrated waveform modulation mechanism, the simultaneous and co-frequency modulation method can ensure uninterrupted synaesthesia by superimposing the same-spectrum synaesthesia signals in the time domain.

[0016] 2. Radar interference cancellation DSP eliminates the interference of sensory chirp in the simultaneous and co-frequency millimeter-wave synaesthesia fusion signal on communication; radar de-chirp eliminates the influence of communication waveform on the spectrum broadening of sensory waveform in the simultaneous and co-frequency millimeter-wave synaesthesia fusion signal;

[0017] 3. The simultaneous and co-frequency millimeter-wave synaesthesia fusion signal avoids bandwidth competition between communication and perception signals, ensuring high bandwidth for both. Combined with radar interference cancellation DSP and radar dechirping, it can achieve ultra-high-speed communication and ultra-high-precision perception simultaneously.

[0018] 4. The communication perception fusion optical sideband (CTCF-OSB) and local oscillator (LO) are derived from the same laser source, which reduces system phase noise, improves communication performance and perception accuracy, avoids the use of frequency offset compensation algorithms, and reduces system power consumption.

[0019] 5. Through simultaneous and co-frequency communication perception fusion waveforms, algorithms and architecture, it is more suitable for future large-capacity, high-precision synaesthesia integrated mobile networks; at the transmitting end, a photon-assisted architecture is used to simultaneously up-convert the perception and communication waveforms to the same millimeter wave carrier frequency; the radar and communication waveforms used are consistent with existing independent synaesthesia systems, and no specific modifications are required, making it easier to be compatible with existing synaesthesia algorithms. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of the simultaneous and same-frequency millimeter wave communication perception fusion method of the present invention;

[0021] Figure 2 Flowchart of the radar interference elimination DSP method of the present invention;

[0022] Figure 3 This is a schematic diagram of an embodiment of the present invention;

[0023] Figure 4 It is the signal spectrum diagram of the output end of the photodetector PD;

[0024] Figure 5 It is the time-frequency characteristic diagram of the signal at the output of the photodetector PD;

[0025] Figure 6 This is the constellation diagram of the communication signal demodulated after the radar interference is eliminated by DSP;

[0026] Figure 7 This is the spectrum diagram after radar de-chirping. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0028] See also Figures 1 to 7The present invention discloses a simultaneous and co-frequency millimeter wave communication perception fusion system, comprising a central unit (CU), a distributed unit (DU), n remote units (RU), and m user units (User) corresponding to each remote unit (RU). The central unit (CU) comprises a coherent optical frequency comb generator (OFCG), a multi-channel optical filter (MOF), a simultaneous and co-frequency co-sensing sideband generator, an optical delay matching module, and an optical coupler (OC). The distributed unit (DU) comprises an erbium-doped fiber amplifier (EDFA) and an optical splitter (OS), the function of which is power distribution. Each remote unit (RU) comprises a photodetector (PD), a power amplifier (PA), two antennas (HA), the function of which is to perform photoelectric conversion to generate a millimeter wave signal for simultaneous and co-frequency communication perception fusion, and a radar dechirping module. Each user unit (User) comprises an antenna (HA), an analog down-conversion module, a set of radar interference elimination DSP algorithms, and a set of communication DSP algorithms. The central unit (CU), the distributed units (DU), and the remote units (RU) are connected via optical fiber, and the remote units (RU) and the user units (User) are connected wirelessly.

[0029] Furthermore, wireless connection refers to connection via wireless electromagnetic waves, that is, no wired media such as optical fiber and cable are required. In the present invention, the electromagnetic waves emitted by the antenna of the remote unit R U are received by the antenna of the user unit User, thus achieving wireless connection.

[0030] This enables the present invention to combine the distributed transmission and deployment capabilities of optical fiber with the flexible access capabilities of wireless. By integrating simultaneous and co-frequency communication and perception waveforms, algorithms, and architecture, it is more suitable for future high-capacity, high-precision integrated telepathy mobile networks. At the transmitter end, a photon-assisted architecture is utilized to simultaneously up-convert the perception and communication waveforms to the same millimeter-wave carrier frequency. The radar and communication waveforms employed are consistent with existing independent telepathy systems, requiring no specific modifications and making them more compatible with existing telepathy algorithms.

[0031] A method for simultaneous and co-frequency millimeter-wave communication perception fusion is disclosed. The synaesthesia resource of the central unit (CU) undergoes a series of electrical and optical domain processing and is then transmitted to the distributed unit (DU) via a section of single-mode optical fiber (SMF). The distributed unit (DU) performs power compensation on the received optical signal and then distributes the optical power according to the requirements of each remote unit (RU). The optical signal distributed by the distributed unit (DU) is transmitted to the corresponding n remote units (RU) via n sections of single-mode optical fiber (SMF). Each remote unit (RU) converts the received optical signal into a simultaneous and co-frequency millimeter-wave synaesthesia fusion signal and transmits it to the m user units (User) corresponding to the remote unit (RU) via a wireless channel. Part of the signal transmitted by the remote unit (RU) is reflected back to the remote unit (RU) by the user to perceive each user unit (User), and the other part is received by the user antenna to communicate with each user unit (User).

[0032] Furthermore, the coherent optical frequency comb generator (OFCG) consists of an external cavity laser (ECL), a Mach-Zehnder modulator (MZM), and a radio frequency clock source. The MOF is implemented by an optical interleaver (OIL), and the simultaneous co-frequency sideband generator is implemented by a pair of simultaneous co-frequency communication perception fusion signals driven by Hilbert transforms of the baseband or intermediate frequency IQ modulators.

[0033] Laser light generated by an external cavity laser (ECL) is injected into a Mach-Zehnder modulator (MZM) biased at the minimum transmission point. Driven by an RF clock with a frequency of 0.5f, the MZM generates two coherent optical comb teeth separated by a frequency interval of f, denoted as the modulated light ML and the local oscillator light LO. The optical comb teeth generated by the coherent optical frequency comb generator (OFCG) are injected into a passive optical interleaver (OIL). Here, the optical interleaver OIL acts as a multi-channel filter (MOF) to separate the modulated light ML and the local oscillator light LO. The modulated light ML is then injected into a simultaneous on-frequency synaesthesia sideband generator (CSSB) to generate simultaneous on-frequency communication perception fusion optical sidebands (CTCF-OSB).

[0034] The simultaneous co-frequency synaesthesia sideband generator includes an IQ modulator. The IQ modulator's two sub-modulators are biased at the minimum transmission point and driven by a pair of simultaneous co-frequency synaesthesia signals, each of which is a Hilbert transform of the other. The IQ modulator's main modulation is biased at the orthogonal transmission point, enabling a linear mapping of the simultaneous co-frequency synaesthesia signals from the electrical baseband or intermediate frequency domain to the optical domain. Compared to frequency-division multiplexing and spread spectrum synaesthesia-integrated waveform modulation mechanisms, simultaneous co-frequency modulation conserves spectral resources by superimposing co-spectral synaesthesia signals in the frequency domain, thereby enabling more remote units (RUs) to be accommodated within the limited spectral bandwidth. Furthermore, compared to time-division multiplexing synaesthesia-integrated waveform modulation mechanisms, simultaneous co-frequency modulation ensures uninterrupted synaesthesia by superimposing co-spectral synaesthesia signals in the time domain.

[0035] It should be pointed out that the simultaneous and same-frequency synaesthesia sideband generator is not limited to using an IQ modulator, but can also be implemented using a Mach-Zehnder modulator, a phase modulator, and the like.

[0036] At the same time, the local oscillator (LO) is injected into an optical delay line to tune its delay to ensure coherence with the generated communication-aware fused optical sideband (CTCF-OSB). After delay matching, the LO and CTCF-OSB are coupled together via an optical coupler (OC). The coupled optical signal is transmitted via a single-mode fiber (SMF) to the distributed unit (DU). The CTCF-OSB and LO originate from the same laser source, reducing system phase noise, improving communication performance and perception accuracy, and avoiding the use of frequency offset compensation algorithms, thereby reducing system power consumption.

[0037] Furthermore, at the nth distributed unit (DU), the received coherent optical signal is first input into an erbium-doped fiber amplifier (EDFA) for power compensation. It is then split into n paths by an OS for multi-local-end resource allocation. The OS-split optical signal is transmitted to n remote units (RUs) via n segments of single-mode optical fiber (SMF1, …, SMFn). Simultaneously, the same-frequency modulation scheme conserves spectral resources by superimposing signals with the same frequency spectrum in the frequency domain, enabling more RUs to be accommodated within the limited spectral bandwidth.

[0038] Furthermore, at the nth remote unit (RU), the received coherent optical signal is input into a photodetector (PD) for photoelectric conversion. Based on the square-law detection principle, the photodetector (PD) generates a simultaneous, co-frequency communication perception fusion signal with a carrier frequency of f. By controlling the tooth spacing of the coherent optical frequency comb generator (OFCG) and the filtering characteristics of the multi-channel optical filter (MOF), the frequency of the generated co-frequency communication perception fusion signal can be controlled to millimeter wave frequencies and continuously tuned. Due to the coherent nature of the optical frequency combs, the generated millimeter wave signal is free of frequency deviation caused by laser phase noise. It should be noted that the frequency of the generated signal can also be controlled to the microwave band through direct modulation or intensity modulation. The simultaneous, co-frequency communication perception fusion signal generated by the photodetector (PD) is amplified by the power amplifier (PA) and radiated by the antenna (HA) into the air to perceive surrounding users. The echo reflected by the user is received by the remote unit (RU)'s receiving antenna (HAnc). Radar dechirping is then performed to eliminate the impact of the communication waveform on the perception waveform's spectral broadening. Information such as the user's position and velocity is then acquired and tracked for improved communication quality and other services. At the same time, the mth user corresponding to the nth remote unit RU receives the communication perception fusion signal of the same frequency and at the same time through the antenna HA, and performs analog down-conversion, radar interference elimination DSP, and communication DSP to obtain downlink communication information.

[0039] Furthermore, radar interference elimination DSP such as Figure 2As shown in the figure, the analog down-converted simultaneous co-frequency communication perception fusion signal is first converted to baseband through digital down-conversion and digital filtering. The baseband simultaneous co-frequency communication perception fusion signal is then matched filtered with a backup radar signal to obtain the time delay between the two and achieve signal synchronization. The backup radar signal has the same bandwidth and time width as the radar signal loaded by the central unit (CU). The synchronized baseband simultaneous co-frequency communication perception fusion signal and the backup radar signal then undergo a first de-skew operation to de-chirp the radar waveform in the fused signal. This first de-skew process introduces radar chirp and a DC component into the communication signal. The signal after the first de-skew operation is then averaged to eliminate the DC component introduced by the first de-skew operation. The resulting communication signal after DC de-skew is then de-skewed again with the backup radar signal to eliminate the radar chirp introduced by the first de-skew operation. This eliminates the impact of radar chirp on the communication signal. The signal after the second de-skew operation then undergoes conventional communication DSP to recover the downlink communication information.

[0040] The radar interference cancellation DSP eliminates the interference of the perception chirp in the simultaneous and co-frequency millimeter-wave synaesthesia fusion signal on communication. The radar de-chirp eliminates the influence of the communication waveform on the spectrum broadening of the perception waveform in the simultaneous and co-frequency millimeter-wave synaesthesia fusion signal. The simultaneous and co-frequency millimeter-wave synaesthesia fusion signal avoids bandwidth competition between the communication and perception signals, ensuring that both communication and perception signals have large bandwidth. The combination of radar interference cancellation DSP and radar de-chirp can achieve ultra-high-speed communication and ultra-high-precision perception simultaneously.

[0041] Furthermore, radar interference cancellation DSP can also be performed in the intermediate frequency or radio frequency band. The first de-skewing operation will introduce a clock-like component instead of a DC component. This clock-like component is eliminated through narrowband filtering or down-converted to baseband and then eliminated by averaging.

[0042] In order to better illustrate the beneficial effects of the present invention, the following experiments were performed:

[0043] Parameters of the signal to be transmitted in the embodiment:

[0044] Communication + Perception: 16QAM Quadrature Amplitude Modulation (5.75Gbaud modulation rate) + Linear Frequency Modulation (LFMW linear frequency modulation signal, 5.75GHz bandwidth)

[0045] Experimental results of receiving signals in the embodiment:

[0046] from Figure 4 The signal spectrum at the output of the photodetector PD shows that the communication signal QAM16 and the sensing signal LFM occupy the same spectrum. Figure 5The time-frequency characteristics of the signal at the output of the photodetector (PD) show that the communication signal QAM16 and the perception signal LFM occupy the same time. This generates a simultaneous and co-frequency fused communication and perception signal, significantly improving spectral efficiency.

[0047] Figure 6 This is the constellation diagram of the communication signal demodulated using a conventional communication DSP (without frequency offset compensation) after radar interference cancellation DSP. The bit error rate (BER) is 0.003420, below the hard decision threshold (3.8e-3). This also shows that at the communication receiving end, the secondary de-skew DSP algorithm can eliminate the impact of the perceived waveform chirp on communication, and extract the communication signal from the simultaneous and co-frequency millimeter-wave synaesthesia waveform.

[0048] Figure 7 The following figure shows the spectrum after radar dechirping. A clear peak frequency is visible in the spectrum, corresponding to the user's location information. This also demonstrates that at the radar receiver, dechirping can eliminate the influence of the communication waveform on the spectrum broadening of the perception waveform, allowing perception information to be extracted from the simultaneous and co-frequency millimeter-wave synaesthesia waveform.

Claims

1. A simultaneous and co-frequency millimeter wave communication sensing fusion system, comprising a central unit (CU), a distributed unit (DU), n remote units (RU), and m user units (User) corresponding to each remote unit (RU), characterized by: The central unit CU includes a coherent optical frequency comb generator OFCG, a multi-channel optical filter MOF, a simultaneous co-frequency sideband generator, an optical delay matching module, and an optical coupler OC; the distributed unit DU includes an erbium-doped fiber amplifier EDFA and an optical splitter OS; each remote unit RU includes a photodetector PD, a power amplifier PA, two antennas HA, and a radar dechirping module; each user unit User includes an antenna HA, an analog down-conversion module, a set of radar interference elimination DSP algorithms, and a set of communication DSP algorithms; the central unit CU, distributed units DU and remote units RU are connected via optical fiber, and the remote units RU and user units User are connected wirelessly.

2. A method for simultaneous and same-frequency millimeter wave communication perception fusion using the system of claim 1, characterized in that: The synaesthesia resource of the central unit CU is processed in a series of electrical and optical domains and then transmitted to the distributed unit DU via a section of single-mode optical fiber SMF; the distributed unit DU performs power compensation on the received optical signal and then distributes the optical power according to the needs of each remote unit RU; the optical signal distributed by the distributed unit DU is transmitted to the corresponding n remote units RU via n sections of single-mode optical fiber SMF; each remote unit RU converts the received optical signal into a simultaneous and co-frequency millimeter-wave synaesthesia fusion signal and transmits it to the m user units User corresponding to the remote unit RU via a wireless channel; part of the signal transmitted by the remote unit RU is reflected back to the remote unit RU by the user to sense each user unit User, and the other part is received by the user antenna to communicate with each user unit User.

3. The method for simultaneous and same-frequency millimeter wave communication perception fusion according to claim 2, characterized in that: The specific working method of the central unit CU is as follows: first, the optical frequency comb generated by the coherent optical frequency comb generator OFCG is injected into the multi-channel optical filter MOF, and two coherent optical comb teeth with a frequency interval f are extracted and separated, which are used as the modulated light ML and the local oscillator light LO, respectively; then, the modulated light ML is injected into a simultaneous and co-frequency synaesthesia sideband generator to generate simultaneous and co-frequency communication-aware fusion optical sideband CTCF-OSB; the local oscillator light LO is injected into an optical delay matching module to tune the delay of the local oscillator light LO to ensure the coherence between it and the generated communication-aware fusion optical sideband CTCF-OSB; finally, after delay matching, the local oscillator light LO and the communication-aware fusion optical sideband CTCF-OSB are coupled together through an optical coupler OC; the coupled optical signal is transmitted to the distributed unit DU through the single-mode optical fiber SMF.

4. The millimeter wave communication perception fusion method according to claim 3, characterized in that: The coherent optical frequency comb generator (OFCG) consists of an external cavity laser (ECL), a Mach-Zehnder modulator (MZM), and a radio frequency clock source. The multi-channel optical filter (MOF) is implemented by an optical interleaver (OIL). The simultaneous co-frequency communication sideband generator is implemented by a pair of simultaneous co-frequency communication perception fusion signal-driven IQ modulators with Hilbert transforms of the baseband or intermediate frequency.

5. The method for simultaneous and same-frequency millimeter wave communication perception fusion according to claim 2, characterized in that: The specific working method of the distributed unit DU is as follows: at the nth DU, the received coherent optical signal is first input into the erbium-doped fiber amplifier EDFA for power compensation, and then divided into n paths by an optical splitter OS for multi-end resource allocation; the optical signals after being split by the optical splitter OS are transmitted to n remote units RU through n sections of single-mode optical fiber SMF.

6. The method for simultaneous and co-frequency millimeter wave communication perception fusion according to claim 2, characterized in that: The remote unit RU specifically operates as follows: In the nth remote unit RU, a received coherent optical signal is input into a photodetector PD for photoelectric conversion; based on the square-law detection principle, the photodetector PD generates a simultaneous and co-frequency communication perception fusion signal with a carrier frequency f; by controlling the comb tooth spacing of a coherent optical frequency comb generator (OFCG) and the filtering characteristics of a multi-channel optical filter (MOF), the frequency of the generated synaesthesia fusion signal is controlled to a millimeter wave frequency and continuously tuned; The simultaneous and co-frequency communication perception fusion signal generated by the photodetector PD is amplified by the power amplifier PA and radiated into the air by the antenna HA to perceive surrounding users. The echo reflected by the user is received by the receiving antenna HAnc of the remote unit RU and then subjected to radar de-chirping processing. At the same time, the mth user corresponding to the nth remote unit RU receives the simultaneous and co-frequency communication perception fusion signal through the antenna HAmb, performs analog down-conversion, radar interference cancellation DSP, and communication DSP, and obtains the downlink communication information.

7. The method for simultaneous and co-frequency millimeter wave communication perception fusion according to claim 2, characterized in that: The specific working method of the radar interference elimination DSP is as follows: first, the simultaneous co-frequency communication perception fusion signal after analog down-conversion is first converted to baseband through digital down-conversion and digital filtering, and the baseband simultaneous co-frequency communication perception fusion signal is then matched filtered with a backup radar signal to obtain the delay between the two and complete signal synchronization; then, the synchronized baseband simultaneous co-frequency communication perception fusion signal and the backup radar signal are subjected to a first de-skew operation to achieve de-chirping of the radar waveform in the fusion signal; through the first de-skew processing, the communication signal will introduce radar chirp and DC components; the signal after the first de-skew operation is then subjected to a mean operation to eliminate the influence of the DC component introduced by the first de-skew operation; the communication signal obtained after DC de-skew is again subjected to a second de-skew operation with the backup radar signal to eliminate the radar chirp introduced by the first de-skew operation; at this point, the influence of radar chirp on the communication signal is eliminated; the signal after the second de-skew operation is then subjected to conventional communication DSP to recover downlink communication information.

8. The method for simultaneous and same-frequency millimeter wave communication perception fusion according to claim 7, characterized in that: The backup radar signal has the same bandwidth and time width as the radar signal loaded by the central unit CU.

9. The method for simultaneous and same-frequency millimeter wave communication perception fusion according to claim 7, characterized in that: When the radar interference cancellation DSP is performed in the intermediate frequency or radio frequency band, the first de-skewing operation will introduce a clock-like component instead of a DC component. This clock-like component is eliminated by narrowband filtering or by first down-converting to baseband and then performing averaging processing to eliminate it.

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