WO2023179381A1

WO2023179381A1 - Method and system for fusing millimeter optical carrier sensing and communication

Info

Publication number: WO2023179381A1
Application number: PCT/CN2023/080801
Authority: WO
Inventors: 朱敏; 雷明政; 华炳昌; 李爱杰; 张教; 蔡沅成; 邹昱聪; 余建军
Original assignee: 网络通信与安全紫金山实验室
Priority date: 2022-03-24
Filing date: 2023-03-10
Publication date: 2023-09-28
Also published as: CN114640397A

Abstract

The present disclosure provides a method and system for fusing millimeter optical carrier sensing and communication. The method comprises: dividing an optical carrier into two optical signals, modulating the two optical signals, generating a first optical sideband signal and a second optical sideband signal, and generating a polarized-interleaved optical signal; performing power compensation on the polarized-interleaved optical signal, and dividing the compensated polarized-interleaved optical signal into a plurality of polarized-interleaved optical signals; and processing a single polarized-interleaved optical signal among the plurality of polarized-interleaved optical signals to obtain a multiplexed millimeter optical carrier for communication and sensing. According to a millimeter optical carrier sensing and communication fusion architecture provided by the present disclosure, a signal sideband and a local oscillator sideband for sensing and communication are polarized and interleaved, thereby effectively reducing the requirement on a high-broadband device and the occupation requirement of a spectral bandwidth; insensitive filtering is polarized to eliminate the demand for a complex polarization tracking circuit and a polarization demultiplexing algorithm, thereby simplifying a remote structure, and reducing the complexity of signal processing on a user side; and the present disclosure has huge application potential in a B5G optical wireless network.

Description

An optical carrier millimeter wave sensing fusion communication method and system

Cross-references to related applications

This application claims priority to the Chinese patent application with application number 2022103036993 submitted on March 24, 2022, and the invention title is "An optical carrier millimeter wave sensing fusion communication method and system", which is fully incorporated herein by reference. .

Technical field

The present disclosure relates to the field of optical communication technology, and in particular to an optical carrier millimeter wave sensing fusion communication method and system.

Background technique

With the rapid development of autonomous driving, smart factories and smart homes, the application of Beyond Fifth Generation in mobile communication system (B5G) has put forward the urgent need for high-precision sensing and ultra-high-speed communication. The realization of ultra-high-precision sensing and ultra-high communication rate is inseparable from the support of ultra-high frequency and ultra-large operating bandwidth. Therefore, radar and mobile communications are developing towards the millimeter wave frequency band, relying on the rich spectrum resources of millimeter wave technology to achieve centimeter-level sensing accuracy and hundreds of Gbps-level communication rates.

In the B5G distributed millimeter wave network, due to severe attenuation caused by coaxial cables, ultra-low transmission loss optical wireless communication (Radio-over-Fiber, RoF) technology shows great application potential. In addition, the centralized processing characteristics of the RoF link can greatly simplify the structure of the remote unit (RU). In high-precision sensing systems, linear frequency modulated (LFM) waves with large time and wide bandwidth products are widely used, which is very different from waveforms such as quadrature amplitude modulation (Quadrature Amplitude Modulation (QAM)) commonly used in communication systems. . Due to different signal formats, the most direct way to integrate communication and sensing in the RoF link is frequency division multiplexing. In order to reduce the spectral crosstalk between the two frequency division multiplexed optical signals in the RoF link, polarization multiplexing technology can be used . However, directly polarization multiplexing millimeter wave signals will increase the system's requirements for device bandwidth and waste part of the spectral resources, and the use of polarization tracking circuits will increase the complexity of the system RU, and the use of polarization demultiplexing algorithms will increase the number of users. The complexity and power consumption of end-end digital signal processing (Digital Signal Processing, DSP) algorithms. In addition, when millimeter waves are transmitted in RoF links, there will be power fading caused by fiber dispersion, which will deteriorate the signal quality.

Therefore, it is necessary to propose a new optical-carrying millimeter wave communication fusion sensing communication method to achieve the seamless integration of millimeter wave communication and sensing.

Contents of the invention

The present disclosure provides an optical millimeter wave sensing fusion communication method and system to solve the problem of large transmission bandwidth between devices and waste of spectral resources caused by polarization multiplexing of RoF links in optical millimeter wave related technologies, as well as a polarization demultiplexing algorithm. Overly complex defects to achieve seamless integration of millimeter wave communication and perception.

In a first aspect, the present disclosure provides an optical millimeter wave sensing fusion communication method, including:

Divide the optical carrier into two optical signals, modulate the two optical signals, and generate a first optical sideband signal and a second optical sideband signal, based on the first optical sideband signal and the second optical sideband The signal generates a polarization interleaved optical signal;

Perform power compensation on the polarization interleaved optical signal, and divide the compensated polarization interleaved optical signal into multiple polarization interleaved optical signals;

The single-channel polarization interleaved optical signal among the multi-channel polarization interleaved optical signals is split, filtered, photoelectrically converted and power amplified to obtain multiplexed optical carrier millimeter waves.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the optical carrier is divided into two optical signals, the two optical signals are modulated, and a first optical sideband signal and a second optical sideband signal are generated. , generating a polarization interleaved optical signal based on the first optical sideband signal and the second optical sideband signal, including:

The first optical coupler divides the optical carrier generated by the laser into a first optical signal and a second optical signal;

Perform optical sideband processing on the first optical signal and the second optical signal respectively to obtain multiple optical sideband signals;

Multiple optical sideband signals are sequentially optically split and then recombined to obtain the first optical sideband signal and the second optical sideband signal;

The first optical sideband signal and the second optical sideband signal are polarized interleaved to obtain the polarization interleaved optical signal.

According to an optical millimeter wave sensing fusion communication method provided by the present disclosure, the first optical signal and the second optical signal are respectively subjected to optical sideband processing to obtain a plurality of optical sideband signals, including :

Input the first optical signal into the synaesthetic sideband generator to obtain the communication optical sideband signal and the sensing optical sideband signal;

The second optical signal is input into a dual-tone local oscillator generator to obtain a first local oscillator optical sideband signal and a second local oscillator optical sideband signal.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the plurality of optical sideband signals are optically split in sequence and then recombined to obtain the first optical sideband signal and the second optical sideband signal. Sideband signals include:

Input the communication optical sideband signal and the sensing optical sideband signal into a first multi-channel optical filter for branching, and combine the first local oscillator optical sideband signal and the second local oscillator optical sideband signal. The signal is input to the second multi-channel optical filter for splitting;

The second optical coupler combines the sensing optical sideband signal and the second local oscillator optical sideband signal to obtain the first optical sideband signal;

The third optical coupler combines the communication optical sideband signal and the first local oscillator optical sideband signal to obtain the third Two optical sideband signals.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the polarization interleaving of the first optical sideband signal and the second optical sideband signal to obtain the polarization interleaved optical signal includes:

Input the first optical sideband signal into a first polarization controller for polarization state alignment, and obtain the first optical sideband signal after polarization state alignment;

After inputting the second optical sideband signal into the second polarization controller, the polarization state is aligned to obtain the second optical sideband signal after polarization state alignment;

The polarization beam combiner performs polarization interleaving on the first optical sideband signal and the second optical sideband signal after the polarization states are aligned, and outputs the polarization interleaved optical signal.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, power compensation is performed on the polarization interleaved optical signal, and the compensated polarization interleaved optical signal is divided into multiple polarization interleaved optical signals, including:

Input the polarization interleaved optical signal to an erbium-doped optical fiber amplifier for power compensation, and obtain the compensated polarization interleaved optical signal;

The optical splitter performs multi-channel optical resource allocation on the compensated polarization interleaved optical signals to obtain the multi-channel polarization interleaved optical signals.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the single-channel polarization interleaved optical signal among the multi-channel polarization interleaved optical signals is split, filtered, photoelectrically converted and power amplified to obtain multiplexing Optical carrier millimeter waves, including:

The single-channel polarized interleaved optical signal is divided into a first polarized interleaved optical signal and a second polarized interleaved optical signal by a fourth optical coupler;

Perform optical bandpass filtering on the first polarization interleaved optical signal and the second polarization interleaved optical signal respectively to obtain multiple polarization interleaved optical signals;

Perform photoelectric conversion and power amplification on the plurality of polarized interleaved optical signals to obtain multiple millimeter waves;

The plurality of millimeter waves are radiated to the user end through different antennas, so that the user end obtains the multiplexed optical carrier millimeter waves.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the first polarization interleaved optical signal and the second polarization interleaved optical signal are separately subjected to optical bandpass filtering to obtain multiple polarization interleaved optical signals. ,include:

Input the first polarization interleaved optical signal to a first optical bandpass filter to filter the first local oscillation optical sideband signal to obtain a perceptual polarization interleaved optical signal;

The second polarization interleaved optical signal is input to the second optical bandpass filter, and the second local oscillator optical sideband signal is filtered to obtain a communication polarization interleaved optical signal.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the plurality of polarized interleaved optical signals are subjected to photoelectric conversion and power amplification to obtain multiple millimeter waves, including:

The sensing polarization interleaved light signal is photoelectrically converted by the first photodetector and amplified by the first power amplifier to obtain sensing millimeter waves;

The communication polarization interleaved optical signal is photoelectrically converted by the second photodetector and amplified by the second power amplifier to obtain communication millimeter waves.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the plurality of millimeter waves are radiated to the user terminal through different antennas, so that the user terminal obtains the multiplexed optical carrier millimeter wave, include:

The sensing millimeter waves are respectively radiated to the user terminal through the first antenna, and the communication millimeter waves are radiated to the user terminal through the second antenna;

The user terminal receives the multiplexed optical carrier millimeter wave composed of the sensing millimeter wave and the communication millimeter wave through a fourth antenna.

According to an optical carrier millimeter wave sensing fusion communication method provided by the present disclosure, the single-channel polarization interleaved optical signal among the multi-channel polarization interleaved optical signals is split, filtered, photoelectrically converted and power amplified to obtain multiplexing Optical-carrying millimeter waves, using the multiplexed optical-carrying millimeter waves to communicate with the user end, and then also includes:

The third antenna receives the sensing reflection echo of the user terminal, performs signal processing on the sensing reflection echo, and obtains the location information of the user terminal.

In a second aspect, the present disclosure also provides an optical millimeter wave sensing fusion communication system, including:

A central unit, a distributed unit and at least one remote unit. The central unit is connected to the distributed unit and the at least one remote unit in turn through single-mode optical fiber, where:

The central unit is configured to split and modulate the optical carrier to obtain multiple optical sideband signals, and generate polarization interleaved optical signals based on the multiple optical sideband signals;

The distributed unit is configured to perform power compensation on the polarization interleaved optical signal, and distribute and output multiple polarization interleaved optical signals;

The at least one remote unit is configured to convert one of the multi-channel polarization interleaved optical signals into multiplexed optical carrier millimeter waves for perceptual communication with the user terminal.

According to an optical carrier millimeter wave sensing fusion communication system provided by the present disclosure, the central unit includes a laser, a synaesthesia sideband generator, a two-tone local oscillator generator and a first optical coupler, wherein:

The laser is configured to output an optical carrier wave;

The first optical coupler is configured to divide the optical carrier into a first optical signal and a second optical signal;

The synaesthetic sideband generator is configured to perform asymmetric single sideband modulation on the first optical signal to generate a communication optical sideband signal and a sensing optical sideband signal;

The two-tone local oscillator generator is configured to generate a first local oscillator optical sideband signal and a second local oscillator optical sideband signal from the second optical signal.

According to an optical carrier millimeter wave sensing fusion communication system provided by the present disclosure, the central unit further includes a second optical coupler combiner, third optical coupler, first multi-channel optical filter and second multi-channel optical filter, wherein:

The first multi-channel optical filter includes a first upper output port and a first lower output port, and the first multi-channel optical filter is configured to separate the communication optical sideband signal and the sensing optical sideband signal. After the path, the communication optical sideband signal is output to the third optical coupler through the first upper output port, and the first lower output port outputs the sensing optical sideband signal to the second optical coupler;

The second multi-channel optical filter includes a second upper output port and a second lower output port, and the second multi-channel optical filter is configured to combine the first local oscillator optical sideband signal and the second local oscillator optical sideband signal. After the oscillation sideband signal is split, the first local oscillation sideband signal is output to the third optical coupler through the second upper output port, and the second lower output port outputs the The second local oscillator optical sideband signal is output to the second optical coupler;

The second optical coupler is configured to combine the sensing optical sideband signal and the second local oscillator optical sideband signal and output the first optical sideband signal;

The third optical coupler is configured to combine the communication optical sideband signal and the first local oscillator optical sideband signal and output the second optical sideband signal.

According to an optical carrier millimeter wave sensing fusion communication system provided by the present disclosure, the central unit further includes a first polarization controller, a second polarization controller and a polarization beam combiner, wherein:

The first polarization controller is configured to align the polarization state of the first optical sideband signal and then input it to the first input port of the polarization beam combiner;

The second polarization controller is configured to align the polarization state of the second optical sideband signal and then input it to the second input port of the polarization beam combiner;

The polarization beam combiner is configured to perform polarization interleaving on the first optical sideband signal and the second optical sideband signal after the polarization states are aligned, to obtain the polarization interleaved optical signal.

According to an optical millimeter wave sensing converged communication system provided by the present disclosure, the distributed unit includes an erbium-doped optical fiber amplifier and an optical splitter, wherein:

The erbium-doped optical fiber amplifier is configured to perform power compensation on the polarization interleaved optical signal to obtain a compensated polarization interleaved optical signal;

The optical splitter is configured to allocate the compensated polarization interleaved optical signals to multiple channels of optical resources to obtain the multi-channel polarization interleaved optical signals.

According to an optical carrier millimeter wave sensing fusion communication system provided by the present disclosure, a single remote unit among the at least one remote unit includes a fourth optical coupler, a first optical bandpass filter and a second optical bandpass filter. device, where:

The fourth optical coupler is configured to divide the single-channel polarized interleaved optical signal into a first polarized interleaved optical signal and a second polarized interleaved optical signal;

The first optical bandpass filter is configured to receive the first polarization interleaved optical signal, filter the first local oscillation optical sideband signal in the first polarization interleaved optical signal, and obtain a perceptual polarization interleaved optical signal;

The second optical bandpass filter is configured to receive the second polarization interleaved optical signal, filter the second local oscillation optical sideband signal in the second polarization interleaved optical signal, and obtain a communication polarization interleaved optical signal.

According to an optical carrier millimeter wave sensing fusion communication system provided by the present disclosure, the single remote unit further includes a first photodetector, a second photodetector, a first power amplifier, a second power amplifier, a first antenna and Second antenna, where:

The first photodetector is configured to photoelectrically convert the sensing polarization interleaved optical signal to obtain a sensing polarization interleaved electrical signal;

The second photodetector is configured to photoelectrically convert the communication polarization interleaved optical signal to obtain a communication polarization interleaved electrical signal;

The first power amplifier is configured to power amplify the sensing polarization interleaved electrical signal to obtain sensing millimeter waves;

The second power amplifier is configured to power amplify the communication polarization interleaved electrical signal to obtain communication millimeter waves;

The first antenna is configured to radiate the perceived millimeter wave to a fourth antenna of the user terminal;

The second antenna is configured to radiate the communication millimeter wave to the fourth antenna of the user terminal, so that the user terminal performs signal processing on the communication millimeter wave and obtains downlink communication information.

According to an optical carrier millimeter wave sensing fusion communication system provided by the present disclosure, the single remote unit further includes a third antenna, the third antenna is configured to receive the sensing reflection echo of the user terminal, and respond to the sensing reflection The echo is processed for signal processing to obtain user location information.

The optical carrier millimeter wave sensing fusion communication method and system provided by the present disclosure effectively reduces the demand for high-bandwidth equipment and the occupation of spectrum bandwidth by polarization interleaving the signal sidebands and local oscillator sidebands of sensing and communication. Insensitive filtering eliminates the need for complex polarization tracking circuits and polarization demultiplexing algorithms, simplifying the remote structure and reducing the complexity of user-end signal processing.

Description of the drawings

In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, a brief introduction will be given below to the drawings that need to be used in the description of the embodiments or related technologies. Obviously, the drawings in the following description are of the present disclosure. For some embodiments, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic flow chart of the optical millimeter wave sensing fusion communication method provided by the present disclosure;

Figure 2 is a system structure diagram of the optical millimeter wave communication sensing fusion architecture provided by the present disclosure;

Figure 3 is a schematic diagram of generating communication optical sidebands and sensing optical sidebands provided by the present disclosure;

Figure 4 is a schematic diagram of generating local optical sideband signals provided by the present disclosure;

Figure 5 is a schematic diagram of the first optical sideband signal provided by the present disclosure;

Figure 6 is a schematic diagram of the second optical sideband signal provided by the present disclosure;

Figure 7 is a schematic diagram of the polarization interleaved optical signal provided by the present disclosure;

Figure 8 is a schematic diagram of the perceptual polarization interleaved optical signal provided by the present disclosure;

Figure 9 is a schematic diagram of the communication polarization interleaved optical signal provided by the present disclosure;

Figure 10 is a specific structural diagram of the optical millimeter wave communication perception fusion architecture provided by the present disclosure.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the technical solutions in the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings in the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure. , not all examples. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of this disclosure.

In view of the shortcomings in related technologies, this disclosure proposes a new optical-borne millimeter wave sensing fusion communication method and system to achieve seamless fusion of millimeter wave communication and sensing.

Figure 1 is a schematic flow chart of the optical millimeter wave sensing fusion communication method provided by the present disclosure. As shown in Figure 1, it includes:

Step S1: Divide the optical carrier into two optical signals, modulate the two optical signals, and generate a first optical sideband signal and a second optical sideband signal, based on the first optical sideband signal and the second optical sideband signal. Optical sideband signals generate polarization interleaved optical signals;

Step S2, perform power compensation on the polarization interleaved optical signal, and divide the compensated polarization interleaved optical signal into multiple polarization interleaved optical signals;

Step S3: perform splitting, filtering, photoelectric conversion and power amplification on a single polarization interleaved optical signal among the multi-channel polarization interleaved optical signals to obtain multiplexed optical carrier millimeter waves.

It should be noted that the optical-carrying millimeter-wave sensing fusion communication method proposed in this disclosure is based on the optical-carrying millimeter-wave communication sensing fusion architecture. This architecture is used for B5G mobile communications. The specific structure is shown in Figure 2. The architecture mainly includes a central unit (Central Unit, CU), a distributed unit (Distributed Unit, DU), N (N is a positive integer) remote unit (Remote Unit, RU) and the corresponding user unit (User).

First, the CU processes the optical carrier, divides the optical carrier into two optical signals, and performs a series of modulations on the split two optical signals to generate the first optical sideband signal and the second optical sideband signal. Polarization interleaving is performed on the first optical sideband signal and the second optical sideband signal to obtain a polarization interleaved optical signal.

Then the DU performs power compensation on the polarization interleaved optical signal output by the CU to obtain the compensated polarization interleaved optical signal, and performs multi-channel resource allocation on the compensated polarization interleaved optical signal to obtain multi-channel polarization interleaved optical signals, each of which The polarization interleaved optical signals are correspondingly transmitted to a single RU.

Finally, on the single RU side, the single-channel polarized interleaved optical signal is split, optical bandpass filtered, photoelectrically converted to obtain an electrical signal, and the electrical signal is power amplified to obtain the corresponding optical carrier millimeter wave, which is sent to the user through multiple antennas End-to-end transmission, composited to form multiplexed optical carrier millimeter waves to sense user location information and communicate with the user end.

This disclosure effectively reduces the demand for high-bandwidth equipment and the occupation of spectrum bandwidth by polarization interleaving the signal sidebands and local oscillation sidebands of sensing and communication, and eliminates complex polarization tracking circuits and polarization demultiplexing by polarization-insensitive filtering. The needs of the algorithm are used to simplify the remote structure and reduce the complexity of user-side signal processing.

Based on the above embodiment, step S1 includes:

Wherein, the first optical signal and the second optical signal are respectively subjected to optical sideband processing to obtain multiple optical sideband signals, including:

Wherein, the plurality of optical sideband signals are optically split in sequence and then recombined to obtain the first optical sideband signal and the second optical sideband signal, including:

The third optical coupler combines the communication optical sideband signal and the first local oscillator optical sideband signal to obtain the second optical sideband signal.

Wherein, the polarization interleaving of the first optical sideband signal and the second optical sideband signal to obtain the polarization interleaved optical signal includes:

After the second optical sideband signal is input to the second polarization controller, the polarization state is aligned to obtain the polarization state aligned the second optical sideband signal;

Specifically, on the CU side, an optical carrier is generated by a laser (Laser Diode, LD). The optical carrier is input to the first optical coupler (Optical Coupler1, OC1) and is divided into a first optical signal and a second optical signal.

The first optical signal is input into the synaesthesia sideband generator, and the second optical signal is input into the two-tone local oscillator generator. The synaesthetic sideband generator is used to realize asymmetric single sideband (SSB) modulation. The first optical signal generates communication optical sidebands (Com-OSB) and sensing optical sidebands (Sen-OSB) located on both sides of the optical carrier. OSB), as shown in Figure 3. The asymmetric SSB modulation here can eliminate the power fading caused by fiber dispersion in long-distance services; the second optical signal is input into the dual-tone local oscillator generator to generate the first local oscillator optical sideband. signal (+LO-OSB), and the second local oscillator optical sideband signal (-LO-OSB), as shown in Figure 4. Since the above four sidebands are generated by the same shared laser, there is no phase noise introduced by the laser frequency offset.

Here, the synaesthesia sideband generator can use an I/Q modulator, and the two-tone local oscillator generator can use a Mach-Zehnder Modulator (MZM). As shown in Figure 10, the I/Q modulator The two sub-MZMs are respectively driven by the real part (Real) and the imaginary part (Imag) of the communication (Com) and perception (Sen) complex signals of an intermediate frequency (IF) frequency. The two sub-MZMs inside the I/Q modulator are biased at the minimum transmission point, and the main MZM inside the I/Q modulator is biased at the quadrature transmission point to achieve asymmetric single sideband (SSB) modulation. Generating communication sidebands (Com-OSB) and sensing sidebands (Sen-OSB) located on both sides of the optical carrier. At the same time, the MZM is driven by a radio frequency local oscillator (Local Oscillator, LO) signal. The RF LO is used to simultaneously upconvert Com and Sen signals at IF frequencies to the millimeter wave band. The MZM is biased at the minimum transmission point to achieve carrier-suppressed double-sideband modulation, producing two LO optical sidebands (-LO-OSB and +LO-OSB) located on both sides of the optical carrier.

Then, the generated communication optical sideband signal and sensing optical sideband signal are input into the first multi-channel optical filter (Multi-channel Optical Filter1, M-OF1) for splitting to separate Com-OSB and Sen-OSB; at the same time , -LO-OSB and +LO-OSB input the second multi-channel optical filter (M-OF2), which separates -LO-OSB and +LO-OSB; the second optical coupler (OC2) separates -LO-OSB Recombine with Sen-OSB to obtain the first optical sideband signal, as shown in Figure 5. The third optical coupler (OC3) recombines +LO-OSB and Com-OSB to obtain the second optical sideband signal, as shown in Figure 5. As shown in Figure 6.

In addition, as shown in Figure 10, the first multi-channel optical filter (M-OF1) can use the first interleaver (Inter Leaver, IL1) to separate Com-OSB and Sen-OSB. Similarly, the second multi-channel optical filter The optical filter (M-OF2) uses the second interleaver (Inter Leaver, IL2) to separate -LO-OSB and +LO-OSB.

Further, the first optical sideband signal coupled by OC2 is polarized through the first polarization controller (Polarization Controller1, PC1) and then injected into the polarization beam combiner (PBC), and the coupled first optical sideband signal by OC3 is The second optical sideband signal is polarized by the second polarization controller (PC2) and then injected into the polarization combiner. beam converter (PBC), perform polarization interleaving, and obtain polarization interleaved optical signals, as shown in Figure 7, where -LO-OSB and Sen-OSB are denoted as X-polarization (X-pol.), +LO-OSB and Com-OSB Denoted as Y polarization (Y-pol.).

Finally, the output polarization interleaved optical signal is transmitted to DU through single-mode fiber (Single-Mode Fiber, SMF).

By using polarization interleaving, this disclosure saves some spectral resources compared to traditional polarization multiplexing, thereby enabling more RUs to be connected within a limited spectral bandwidth, and introducing asymmetric single sideband modulation to eliminate the introduction of optical fiber dispersion. power fading.

Based on any of the above embodiments, step S2 includes:

Specifically, on the DU side, the received polarization interleaved optical signal is input to an Erbium Doped Fiber Amplifier (EDFA) for power compensation, and the compensated polarization interleaved optical signal is obtained.

The optical splitter (Optical Splitter, OS) is divided into N channels for resource allocation to connect N RUs. That is, the polarization interleaved optical signals split by the OS are transmitted through N sections of single-mode optical fibers (SMF1,...,SMFn). to N RUs.

Based on RoF technology, this disclosure realizes the seamless integration of communication and perception in the millimeter wave frequency band, and realizes the multiplexing of optical path signal resources, effectively saving transmission resources.

Based on any of the above embodiments, step S3 includes:

Wherein, the first polarization interleaved optical signal and the second polarization interleaved optical signal are respectively subjected to optical bandpass filtering to obtain multiple polarization interleaved optical signals, including:

wherein the plurality of polarized interleaved optical signals are subjected to photoelectric conversion and power amplification to obtain a plurality of millimeter waves, include:

Wherein, the radiating the plurality of millimeter waves to the user terminal through different antennas so that the user terminal obtains the multiplexed optical carrier millimeter waves includes:

Specifically, on the single RU side, the fourth optical coupler (OC4) first splits the polarized interleaved optical signal into two paths, into the first polarized interleaved optical signal and the second polarized interleaved optical signal, and inputs them to the first optical band respectively. Optical Bandpass Filter1 (OBPF1) and the second optical bandpass filter (OBPF2), among which OBPF1 suppresses +LO-OSB and is then used for sensing to obtain the perceived polarization interleaved optical signal. As shown in Figure 8, OBPF2 filter In addition to -LO-OSB, it is then used for communication to obtain the communication polarization interleaved optical signal, as shown in Figure 9.

It can be understood that for the sensing channel, the optical signal output by OBPF1 is first input into the first photoelectric detector (Photoelectric Detector1, PD1) for photoelectric conversion. Since the optical signals of different polarization states do not perform beat frequency, only the millimeter wave frequency band is generated. A pure sensing signal generated by -LO-OSB and Sen-OSB beat frequency. The millimeter wave sensing signal generated by PD1 is amplified by the first power amplifier (Power Amplifier1, PA1) to obtain the sensing millimeter wave, which is obtained by the first antenna. (HA1) radiates millimeter waves into the air to sense surrounding users; for the communication channel, the optical signal output by OBPF2 is first input into the second photodetector (PD2) for photoelectric conversion. Since the optical signals of different polarization states do not perform beat frequency, In the millimeter wave band, only a pure communication signal generated by the +LO-OSB and Com-OSB beat frequencies is generated. After the millimeter wave communication signal generated by PD2 is amplified by PA2, the communication millimeter wave is obtained. The communication millimeter wave is radiated by HA2. to communicate wirelessly with users in the air. The sensing millimeter wave and communication millimeter wave here form a multiplexed optical carrier millimeter wave on the user side. The communication signal received by the user is received by the fourth antenna (HA4) of the user side and then processed by DSP to obtain downlink communication information.

The polarization interleaved optical signal used in this disclosure effectively reduces the system's demand for device bandwidth. Due to polarization-insensitive filtering, it avoids the use of polarization tracking circuits at the RU and avoids the use of polarization demultiplexing algorithms at the user end.

Based on any of the above embodiments, step S3 also includes:

Optionally, in addition to the transmitting antenna, a receiving antenna is also provided on the RU side, as shown in Figure 2, that is, the third antenna (HA3), the reflected echo from the user side is received through HA3, and then processed by DSP to obtain and track the user's location information, which is used to improve communication quality and other services.

The present disclosure obtains user location information in real time by receiving feedback signals from the user end, which facilitates the system to quickly analyze and obtain the user end communication quality, and facilitates adjustment of communication services.

Figure 2 is a system structure diagram of the optical carrier millimeter wave communication perception fusion architecture of B5G mobile communication provided by the present disclosure. As shown in Figure 2, it includes:

The at least one remote unit is configured to convert one of the multi-channel polarization interleaved optical signals into multiplexed optical carrier millimeter waves for perceptual communication with the user end.

Specifically, the optical carrier millimeter wave architecture proposed in this disclosure is used for millimeter wave communication and perception fusion in B5G optical wireless networks. It is divided into three main parts, the central unit (CU), the distributed unit (DU) and the N Remote units (RU), where N is a positive integer, and the three modules are connected through single-mode optical fibers.

Among them, the central unit splits and modulates the optical carrier to obtain multiple optical sideband signals, and generates polarization interleaved optical signals based on the multiple optical sideband signals. The polarization interleaved optical signals are sent to the distributed units through single-mode optical fibers. The distributed unit performs power compensation on the polarized interleaved optical signals, performs resource allocation, and outputs multi-channel polarized interleaved optical signals to connect to multiple remote units. A single remote unit converts the multi-channel polarized interleaved optical signals into multiplexed optical carriers. Millimeter waves are used to sense user location information and communicate with the user end.

The optical carrier millimeter wave communication perception fusion architecture proposed in this disclosure is based on polarization interleaving and polarization insensitive filtering. The polarization insensitive filter eliminates the need for complex polarization tracking circuits and polarization demultiplexing algorithms, thereby simplifying the remote The system structure at the unit reduces the complexity of digital signal processing at the user end.

Based on the above embodiment, the central unit includes a laser, a synaesthesia sideband generator, a two-tone local oscillator generator and a first optical coupler, wherein:

The laser is configured to output an optical carrier wave;

Wherein, the central unit also includes a second optical coupler, a third optical coupler, a first multi-channel optical filter and a second multi-channel optical filter, wherein:

Wherein, the central unit further includes a first polarization controller, a second polarization controller and a polarization beam combiner, wherein:

Specifically, CU includes a laser (LD), three optical couplers (OC1, OC2, and OC3), a synaesthetic sideband generator, a two-tone local oscillator generator, and two multi-channel optical filters (M- OF1 and M-OF2), two polarization controllers (PC) and a polarization beam combiner (PBC).

The laser (LD) is set to output an optical carrier, and the first optical coupler (OC1) is set to split the optical carrier into a first optical signal and a second optical signal, one input to the synaesthesia sideband generator, and the other input dual tone local oscillator generator;

The synaesthetic sideband generator is used to implement asymmetric single sideband (SSB) modulation and generate communication optical sideband signal (Com-OSB) and sensing optical sideband signal (Sen-OSB); the dual-tone local oscillator generator generates two The first local oscillator optical sideband signal (+LO-OSB) and the second local oscillator optical sideband signal (-LO-OSB) located on both sides of the optical carrier;

The two optical sidebands generated by the synaesthetic sideband generator are input into the first multi-channel optical filter (M-OF1) to separate Com-OSB and Sen-OSB; at the same time, the two optical sidebands generated by the dual-tone local oscillator generator The optical sidebands are fed into a second multi-channel optical filter (M-OF2) to separate -LO-OSB and +LO-OSB. Subsequently, the second optical coupler (OC2) connects the lower output port of M-OF1 and the lower output port of M-OF2 to recombine -LO-OSB and Sen-OSB to obtain The first optical sideband signal, the third optical coupler (OC3) connects the upper output port of M-OF1 and the upper output port of M-OF2 to recombine +LO-OSB and Com-OSB to obtain the second optical sideband signal. sideband signals.

The first polarization controller (PC1) performs polarization alignment on the first optical sideband signal and then inputs it to the first input port of the polarization beam combiner (PBC). The second polarization controller performs polarization alignment on the second optical sideband signal. After the polarization state is aligned, it is input to the second input port of the polarization beam combiner (PBC). The polarization beam combiner (PBC) performs polarization interleaving, outputs the polarization interleaving optical signal, and transmits it to the distributed unit through a single-mode optical fiber.

This disclosure realizes the seamless integration of communication and perception in the millimeter wave frequency band, and eliminates the power fading caused by fiber dispersion through asymmetric single sideband modulation. Since the optical sidebands all come from the same source laser, the system noise is effectively reduced, and Avoiding the use of frequency offset compensation algorithms improves communication performance and sensing accuracy.

Based on any of the above embodiments, the distributed unit includes an erbium-doped fiber amplifier and an optical splitter, wherein:

Specifically, the DU includes an Erbium-doped Fiber Amplifier (EDFA) and an Optical Splitter (OS).

The received polarized interleaved optical signal is first input into the Erbium-doped Fiber Amplifier (EDFA) for power compensation, and then divided into N channels by the optical splitter (OS) for resource allocation. The polarized interleaved optical signal after OS split Transmit to N RUs respectively through N sections of single-mode optical fibers (SMF1,...,SMFn).

Based on any of the above embodiments, a single remote unit among the at least one remote unit includes a fourth optical coupler, a first optical bandpass filter and a second optical bandpass filter, wherein:

Wherein, the single remote unit further includes a first photodetector, a second photodetector, a first power amplifier, a second power amplifier, a first antenna and a second antenna, wherein:

Specifically, the fourth optical coupler (OC4) first divides the polarized interleaved optical signal after DU splitting into two paths, namely the first polarized interleaved optical signal and the second polarized interleaved optical signal; then the two polarized interleaved optical signals are separately interleaved. The optical signal is input into two optical bandpass filters (OBPF1 and OBPF2) for filtering.

OBPF1 filters +LO-OSB and uses it for sensing to obtain a sensing polarization interleaved optical signal; OBPF2 filters -LO-OSB and uses it for communication to obtain a communication polarization interleaved optical signal.

The first photodetector (PD1) is set to process the sensing channel side, and performs photoelectric conversion on the sensing polarization interleaved optical signal to obtain the sensing polarization interleaved electrical signal; the second photodetector (PD2) is configured to process the communication channel side, and performs photoelectric conversion on the communication polarization The interleaved optical signal undergoes photoelectric conversion to obtain a communication polarization interleaved electrical signal.

The first power amplifier (PA1) amplifies the sensed polarization interleaved electrical signal generated by the first photodetector (PD1) to obtain the sensed millimeter wave, which is radiated by the first antenna (HA1) into the air to sense surrounding users; the second power amplifier (PA2) Amplifies the power of the communication polarization interleaved electrical signal generated by the second photodetector (PD2) to obtain the communication millimeter wave, which is radiated by the second antenna (HA2) into the air for wireless communication with the user. The communication signal received by the user After being received by the fourth antenna (HA4) of the user end, DSP processing is performed to obtain downlink communication information.

The present disclosure reduces the system's demand for bandwidth of devices such as modulators by using polarized interleaved optical signals. In addition, due to polarization-insensitive filtering, the MoF architecture does not use polarization tracking circuits at the RU, nor does it use polarization demultiplexing algorithms at the user to achieve separation of millimeter wave communication and sensing signals, making the system very easy to photonic integration.

Based on any of the above embodiments, the single remote unit further includes a third antenna, the third antenna is configured to receive the perceived reflection echo of the user terminal, perform signal processing on the perceived reflection echo, and obtain the user terminal location information.

Optionally, on the RU side, for sensing millimeter waves, the user end will transmit the sensing reflection echo to the RU, and the RU will receive it through the third antenna (HA3), and then further perform DSP processing to obtain and track the user location information. According to This location information improves communication quality and other services.

A specific example is used below to illustrate the effect of the present disclosure. The experimental conditions used include: the total length of the optical fiber is 5.42km, the intermediate frequency sensing signal is LFM (6-7.15GHz), the intermediate frequency communication signal is 16QAM (10GHz, 5.75GBaud), and the local oscillation frequency is 18GHz.

According to the solution proposed in this disclosure, the final experimental results include: the occupied spectral bandwidth is 36GHz, the millimeter wave sensing signal is LFM (24-25.15GHz), and the millimeter wave communication signal is 16QAM (28GHz, 5.75GBaud).

Due to polarization-insensitive filtering, the suppression ratio of millimeter-wave LFM to 16QAM is 21.3dB, and no power fading introduced by dispersion is observed. Since frequency offset compensation is not used, the perceived distance of the system and the distance measured by the tape measure are basically consistent, with an error of ±15mm.

Due to polarization-insensitive filtering, the suppression ratio of millimeter wave 16QAM and LFM is 22.5dB, and no power fading caused by dispersion is observed; due to polarization interleaving, the interference signals LI2 and SSBI2 are suppressed by 18.1dB and 19.9dB respectively; no frequency offset compensation is used , the vector error amplitude of the signal is 9.4%, which is far lower than the 3GPP standard value of 12.5%.

The device embodiments described above are only illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in One location, or it can be distributed across multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Persons of ordinary skill in the art can understand and implement the method without any creative effort.

Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions can be embodied in the form of software products in essence or in part that contribute to related technologies. The computer software products can be stored in computer-readable storage media, such as ROM/RAM, disks. , optical disk, etc., including a number of instructions to cause a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure, but not to limit it; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be Modifications may be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions may be made to some of the technical features; however, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

An optical carrier millimeter wave sensing fusion communication method, which includes:

Divide the optical carrier into two optical signals, modulate the two optical signals, and generate a first optical sideband signal and a second optical sideband signal, based on the first optical sideband signal and the second optical sideband The signal generates a polarization interleaved optical signal;

Perform power compensation on the polarization interleaved optical signal, and divide the compensated polarization interleaved optical signal into multiple polarization interleaved optical signals;

The single-channel polarization interleaved optical signal among the multi-channel polarization interleaved optical signals is split, filtered, photoelectrically converted and power amplified to obtain multiplexed optical carrier millimeter waves.
The optical carrier millimeter wave sensing fusion communication method according to claim 1, wherein the optical carrier is divided into two optical signals, the two optical signals are modulated, and a first optical sideband signal and a second optical sideband signal are generated. band signal, generating a polarization interleaved optical signal based on the first optical sideband signal and the second optical sideband signal, including:

The first optical coupler divides the optical carrier generated by the laser into a first optical signal and a second optical signal;

Perform optical sideband processing on the first optical signal and the second optical signal respectively to obtain multiple optical sideband signals;

Multiple optical sideband signals are sequentially optically split and then recombined to obtain the first optical sideband signal and the second optical sideband signal;

The first optical sideband signal and the second optical sideband signal are polarized interleaved to obtain the polarization interleaved optical signal.
The optical carrier millimeter wave sensing fusion communication method according to claim 2, wherein the first optical signal and the second optical signal are separately subjected to optical sideband processing to obtain a plurality of optical sideband signals. ,include:

Input the first optical signal into the synaesthetic sideband generator to obtain the communication optical sideband signal and the sensing optical sideband signal;

The second optical signal is input into a dual-tone local oscillator generator to obtain a first local oscillator optical sideband signal and a second local oscillator optical sideband signal.
The optical carrier millimeter wave sensing fusion communication method according to claim 3, wherein the plurality of optical sideband signals are optically split in sequence and then recombined to obtain the first optical sideband signal and the third optical sideband signal. Two optical sideband signals include:

Input the communication optical sideband signal and the sensing optical sideband signal into a first multi-channel optical filter for branching, and combine the first local oscillator optical sideband signal and the second local oscillator optical sideband signal. The signal is input to the second multi-channel optical filter for splitting;

The second optical coupler combines the sensing optical sideband signal and the second local oscillator optical sideband signal to obtain the first optical sideband signal;

The third optical coupler combines the communication optical sideband signal and the first local oscillator optical sideband signal to obtain the second optical sideband signal.
The optical carrier millimeter wave sensing fusion communication method according to claim 4, wherein the polarization interleaved optical signal is obtained by performing polarization interleaving on the first optical sideband signal and the second optical sideband signal, include:

Input the first optical sideband signal into a first polarization controller for polarization state alignment, and obtain the first optical sideband signal after polarization state alignment;

After inputting the second optical sideband signal into the second polarization controller, the polarization state is aligned to obtain the second optical sideband signal after polarization state alignment;

The polarization beam combiner performs polarization interleaving on the first optical sideband signal and the second optical sideband signal after the polarization states are aligned, and outputs the polarization interleaved optical signal.
The optical carrier millimeter wave sensing fusion communication method according to claim 1, wherein the power compensation is performed on the polarization interleaved optical signal, and the compensated polarization interleaved optical signal is divided into multiple polarization interleaved optical signals, including:

Input the polarization interleaved optical signal to an erbium-doped optical fiber amplifier for power compensation, and obtain the compensated polarization interleaved optical signal;

The optical splitter performs multi-channel optical resource allocation on the compensated polarization interleaved optical signals to obtain the multi-channel polarization interleaved optical signals.
The optical carrier millimeter wave sensing fusion communication method according to claim 1, wherein the single-channel polarization interleaved optical signal among the multi-channel polarization interleaved optical signals is divided, filtered, photoelectrically converted and power amplified to obtain Multiplexing optical carrier millimeter waves, including:

The single-channel polarized interleaved optical signal is divided into a first polarized interleaved optical signal and a second polarized interleaved optical signal by a fourth optical coupler;

Perform optical bandpass filtering on the first polarization interleaved optical signal and the second polarization interleaved optical signal respectively to obtain multiple polarization interleaved optical signals;

Perform photoelectric conversion and power amplification on the plurality of polarized interleaved optical signals to obtain multiple millimeter waves;

The plurality of millimeter waves are radiated to the user end through different antennas, so that the user end obtains the multiplexed optical carrier millimeter waves.
The optical carrier millimeter wave sensing fusion communication method according to claim 7, wherein the first polarization interleaved optical signal and the second polarization interleaved optical signal are respectively subjected to optical bandpass filtering to obtain a plurality of polarization interleaved signals. Optical signals, including:

Input the first polarization interleaved optical signal to a first optical bandpass filter to filter the first local oscillation optical sideband signal to obtain a perceptual polarization interleaved optical signal;

The second polarization interleaved optical signal is input to the second optical bandpass filter, and the second local oscillator optical sideband signal is filtered to obtain a communication polarization interleaved optical signal.
The optical carrier millimeter wave sensing fusion communication method according to claim 8, wherein the plurality of polarization interleaved optical signals are subjected to photoelectric conversion and power amplification to obtain a plurality of millimeter waves, including:

The sensing polarization interleaved light signal is photoelectrically converted by the first photodetector and amplified by the first power amplifier to obtain sensing millimeter waves;

The communication polarization interleaved optical signal is photoelectrically converted by the second photodetector and amplified by the second power amplifier to obtain communication millimeter waves.
The optical carrier millimeter wave sensing fusion communication method according to claim 9, wherein the plurality of millimeter waves are radiated to the user terminal through different antennas, so that the user terminal obtains the multiplexed optical carrier millimeter wave. waves, including:

The sensing millimeter waves are respectively radiated to the user terminal through the first antenna, and the communication millimeter waves are radiated to the user terminal through the second antenna;

The user terminal receives the multiplexed optical carrier millimeter wave composed of the sensing millimeter wave and the communication millimeter wave through a fourth antenna.
The optical carrier millimeter wave sensing fusion communication method according to claim 10, wherein the single-channel polarization interleaved optical signal among the multi-channel polarization interleaved optical signals is divided, filtered, photoelectrically converted and power amplified to obtain Multiplexing optical carrier millimeter waves, using the multiplexed optical carrier millimeter waves to communicate with the user end, and then also includes:

The third antenna receives the sensing reflection echo of the user terminal, performs signal processing on the sensing reflection echo, and obtains the location information of the user terminal.
An optical carrier millimeter wave sensing fusion communication system, which includes: a central unit, a distributed unit and at least one remote unit, the central unit sequentially communicates with the distributed unit and the at least one remote unit through a single-mode Optical fiber connection, where:

The central unit is configured to split and modulate the optical carrier to obtain multiple optical sideband signals, and generate polarization interleaved optical signals based on the multiple optical sideband signals;

The distributed unit is configured to perform power compensation on the polarization interleaved optical signal, and distribute and output multiple polarization interleaved optical signals;

The at least one remote unit is configured to convert one of the multi-channel polarization interleaved optical signals into multiplexed optical carrier millimeter waves for perceptual communication with the user end.
The optical carrier millimeter wave sensing fusion communication system according to claim 12, wherein the central unit includes a laser, a synaesthesia sideband generator, a dual-tone local oscillator generator and a first optical coupler, wherein:

The laser is configured to output an optical carrier wave;

The first optical coupler is configured to divide the optical carrier into a first optical signal and a second optical signal;

The synaesthetic sideband generator is configured to perform asymmetric single sideband modulation on the first optical signal to generate a communication optical sideband signal and a sensing optical sideband signal;

The two-tone local oscillator generator is configured to generate a first local oscillator optical sideband signal and a second local oscillator optical sideband signal from the second optical signal.
The optical carrier millimeter wave sensing converged communication system according to claim 13, wherein the central unit further It includes a second optical coupler, a third optical coupler, a first multi-channel optical filter and a second multi-channel optical filter, wherein:

The first multi-channel optical filter includes a first upper output port and a first lower output port, and the first multi-channel optical filter is configured to separate the communication optical sideband signal and the sensing optical sideband signal. After the path, the communication optical sideband signal is output to the third optical coupler through the first upper output port, and the first lower output port outputs the sensing optical sideband signal to the second optical coupler;

The second multi-channel optical filter includes a second upper output port and a second lower output port, and the second multi-channel optical filter is configured to combine the first local oscillator optical sideband signal and the second local oscillator optical sideband signal. After the oscillation sideband signal is split, the first local oscillation sideband signal is output to the third optical coupler through the second upper output port, and the second lower output port outputs the The second local oscillator optical sideband signal is output to the second optical coupler;

The second optical coupler is configured to combine the sensing optical sideband signal and the second local oscillator optical sideband signal and output the first optical sideband signal;

The third optical coupler is configured to combine the communication optical sideband signal and the first local oscillator optical sideband signal and output the second optical sideband signal.
The optical millimeter wave sensing fusion communication system according to claim 14, wherein the central unit further includes a first polarization controller, a second polarization controller and a polarization beam combiner, wherein:

The first polarization controller is configured to align the polarization state of the first optical sideband signal and then input it to the first input port of the polarization beam combiner;

The second polarization controller is configured to align the polarization state of the second optical sideband signal and then input it to the second input port of the polarization beam combiner;

The polarization beam combiner is configured to perform polarization interleaving on the first optical sideband signal and the second optical sideband signal after the polarization states are aligned, to obtain the polarization interleaved optical signal.
The optical millimeter wave sensing converged communication system according to claim 12, wherein the distributed unit includes an erbium-doped fiber amplifier and an optical splitter, wherein:

The erbium-doped optical fiber amplifier is configured to perform power compensation on the polarization interleaved optical signal to obtain a compensated polarization interleaved optical signal;

The optical splitter is configured to allocate the compensated polarization interleaved optical signals to multiple channels of optical resources to obtain the multi-channel polarization interleaved optical signals.
The optical carrier millimeter wave sensing converged communication system according to claim 12, wherein a single remote unit of the at least one remote unit includes a fourth optical coupler, a first optical bandpass filter and a second optical band. pass filter, where:

The fourth optical coupler is configured to divide the single-channel polarized interleaved optical signal into a first polarized interleaved optical signal and a second polarized interleaved optical signal;

The first optical bandpass filter is configured to receive the first polarization interleaved optical signal, filter the first polarization interleave The first local oscillator optical sideband signal in the optical signal is used to obtain the perceptual polarization interleaved optical signal;

The second optical bandpass filter is configured to receive the second polarization interleaved optical signal, filter the second local oscillation optical sideband signal in the second polarization interleaved optical signal, and obtain a communication polarization interleaved optical signal.
The optical carrier millimeter wave sensing fusion communication system according to claim 17, wherein the single remote unit further includes a first photodetector, a second photodetector, a first power amplifier, a second power amplifier, a first antenna and second antenna, where:

The first photodetector is configured to photoelectrically convert the sensing polarization interleaved optical signal to obtain a sensing polarization interleaved electrical signal;

The second photodetector is configured to photoelectrically convert the communication polarization interleaved optical signal to obtain a communication polarization interleaved electrical signal;

The first power amplifier is configured to power amplify the sensing polarization interleaved electrical signal to obtain sensing millimeter waves;

The second power amplifier is configured to power amplify the communication polarization interleaved electrical signal to obtain communication millimeter waves;

The first antenna is configured to radiate the perceived millimeter wave to a fourth antenna of the user terminal;

The second antenna is configured to radiate the communication millimeter wave to the fourth antenna of the user terminal, so that the user terminal performs signal processing on the communication millimeter wave and obtains downlink communication information.
The optical carrier millimeter wave sensing fusion communication system according to claim 18, wherein the single remote unit further includes a third antenna, the third antenna is configured to receive the sensing reflection echo of the user terminal, and Sense the reflected echo for signal processing to obtain user location information.