A photonic millimeter wave communication perception fusion architecture system and a low phase noise receiving method

Abstract

The application relates to a photonic millimeter wave communication and sensing fusion architecture system and a low phase noise receiving method, which are suitable for future large-capacity and high-precision communication and sensing integrated mobile networks. In the transmitting end, a millimeter wave communication and sensing signal and a millimeter wave local oscillator signal homologous to the millimeter wave communication and sensing signal are generated and transmitted; in the communication receiving end, the received millimeter wave communication and sensing signal and the millimeter wave local oscillator signal are subjected to polarization demultiplexing, are mixed after polarization matching, the downlink millimeter wave communication and sensing signal is frequency-converted, the use of a down-conversion local oscillator source in the communication receiving end can be avoided, and the frequency deviation and phase noise of the down-converted millimeter wave communication and sensing signal are reduced; in the sensing receiving end, the received millimeter wave communication and sensing signal is mixed with a reference millimeter wave local oscillator signal, and the uplink echo is frequency-converted; the mixing of the homologous millimeter wave local oscillator signal and the millimeter wave communication and sensing signal can reduce the frequency deviation and phase noise of the down-converted sensing signal, so that the detection precision of the radar is improved.

Description

Technical Field

[0001] This invention relates to the fields of optical millimeter-wave technology, communication technology, and radar sensing technology, specifically to a photonic millimeter-wave communication-sensing fusion architecture system and a low phase noise receiving method. Background Technology

[0002] With the rise of intelligent transportation, smart factories, smart homes and other connected industries, the future demand for high-precision sensing and ultra-high-speed communication in 6G mobile communication makes the integration of communication and sensing functions imminent.

[0003] Millimeter waves can provide support for ultra-high frequencies and ultra-large operating bandwidths for 6G mobile communication. However, due to the electronic bottlenecks of electronic devices, all-electronic millimeter wave communication sensing fusion systems suffer from problems such as limited signal frequency and bandwidth, and difficulties in indoor deployment. Photonic millimeter wave communication sensing fusion systems can generate millimeter wave sensing signals through optical heterodyne upconversion, and have superior characteristics such as high signal frequency, large bandwidth, and flexible tuning of frequency and bandwidth. Furthermore, due to the low transmission loss and non-line-of-sight propagation of optical fibers, the coverage distance of millimeter wave communication is extended, facilitating indoor deployment.

[0004] Among these methods, using a free-running laser heterodyne to generate millimeter-wave signals offers a simple structure but suffers from high phase noise. This makes low-cost, low-complexity, and phase-noise-insensitive incoherent envelope detection receiver technology highly desirable. However, directly employing envelope detection technology can lead to signal-to-signal beat frequency crosstalk (SSBI) caused by signal self-mixing, which degrades signal quality. While demodulation at the receiver using the Volterra or Kramers–Kronig (KK) algorithms in the digital domain can recover the signal well, the complex digital signal processing (DSP) demodulation process, high power consumption, and system implementation make low-cost, large-scale deployment difficult. Furthermore, in single photodetector (PD) heterodyne beat frequency envelope detection schemes, the modulation techniques used may increase the peak-to-average power ratio (PAR). To ensure accurate detection of the beat frequency signal by passive envelope detection, a high optical power ratio is typically required for the PD. Additionally, envelope detection requires an auxiliary optical carrier, which further increases the input optical power to the PD, potentially causing premature saturation and resulting in low output power and a low signal-to-noise ratio for the sensing signal. Summary of the Invention

[0005] To address the aforementioned issues and achieve seamless integration of millimeter-wave communication and sensing, while reducing phase noise at the receiver, this invention proposes a photonic millimeter-wave communication-sensing fusion architecture system and a low-phase-noise receiving method, suitable for future high-capacity, high-precision integrated communication-sensing mobile networks. At the transmitter, based on a photonic-assisted architecture, the optical carrier and local oscillator are heterodyne-beat frequency-controlled to generate a millimeter-wave sensing signal; simultaneously, the unmodulated optical carrier and local oscillator are beat frequency-controlled to generate a millimeter-wave local oscillator signal originating from the same source as the millimeter-wave sensing signal. The millimeter-wave sensing signal and the downlink millimeter-wave local oscillator signal are polarization-multiplexed by an orthogonal mode coupler (OMT1) before being transmitted. At the receiver, the millimeter-wave sensing signal and the downlink millimeter-wave local oscillator signal are polarization-demultiplexed by an OMT2, then polarization-matched to convert the downlink millimeter-wave local oscillator signal into the same polarization state as the millimeter-wave sensing signal, followed by mixing to achieve down-conversion of the downlink millimeter-wave sensing signal. Meanwhile, the downlink transmission of the millimeter-wave local oscillator signal avoids the use of a down-conversion electrical local oscillator source at the communication receiver and significantly reduces the frequency offset and phase noise of the down-converted millimeter-wave sensing signal. At the sensing receiver, the uplink millimeter-wave sensing signal is mixed with the reference millimeter-wave local oscillator signal from the transmitter to achieve uplink echo down-conversion. The mixing of the co-source millimeter-wave local oscillator signal and the millimeter-wave sensing signal can greatly reduce the frequency offset and phase noise of the down-converted sensing signal, thereby improving the radar's detection accuracy. Furthermore, the radar and communication waveforms used can be consistent with existing independent sensing systems without requiring specific modifications, making them easily compatible with existing communication and sensing algorithms.

[0006] Firstly, this application provides a photonic millimeter-wave communication sensing fusion architecture system, which adopts the following technical solution:

[0007] A photonic millimeter-wave communication sensing fusion architecture system includes:

[0008] The inductive transmitter includes two external cavity lasers, four optical couplers (OC), an inductive sideband generator, an optical delay line, an adjustable optical attenuator (VOA), an erbium-doped fiber amplifier (EDFA), two photodetectors (PD), two millimeter-wave low-noise amplifiers (mmW-LNA), a millimeter-wave power divider (EC), an orthogonal mode coupler (OMT1), and an antenna (1).

[0009] The sensing receiver includes a millimeter-wave low-noise amplifier mmW-LNA3, an intermediate frequency low-noise amplifier IF-LNA1, a mixer 1, an analog-to-digital converter ADC1, a sensing DSP, and an antenna 2.

[0010] The communication receiver includes a millimeter-wave low-noise amplifier mmW-LNA4, an intermediate-frequency low-noise amplifier IF-LNA2, an orthogonal-mode coupler OMT2, an orthogonal polarization rotator, a mixer 2, an analog-to-digital converter ADC2, a communication DSP, and an antenna 3;

[0011] The sensing receiver and the sensing transmitter are connected by optical fiber and wireless connection, and the communication receiver and the sensing transmitter are connected wirelessly.

[0012] Preferably, the inductive sideband generator includes an IQ modulator, a digital-to-analog converter (DAC), and a transmitter DSP.

[0013] Preferably, the number of communication receivers is n, where n is a positive integer;

[0014] The two external cavity lasers are the optical carrier and the local oscillator, respectively;

[0015] The four optical couplers OC are optical coupler OC1, optical coupler OC2, optical coupler OC3 and optical coupler OC4;

[0016] The two photodetectors PD are photodetector PD1 and photodetector PD2, respectively.

[0017] The two millimeter-wave low-noise amplifiers (mmW-LNAs) are mmW-LNA1 and mmW-LNA2, respectively.

[0018] Secondly, this application provides a low phase noise receiving method for a photonic millimeter-wave communication sensing fusion architecture, employing the following technical solution:

[0019] In the sensing transmitter, the baseband or intermediate frequency sensing digital signal generated by the transmitter DSP is converted into a baseband or intermediate frequency analog sensing signal by the digital-to-analog converter DAC. The optical carrier is split into two paths by the optical coupler OC1. One of the optical carriers is modulated by the baseband or intermediate frequency analog sensing signal through the IQ modulator to generate a modulated optical carrier for communication sensing fusion, which is denoted as the signal light.

[0020] The local oscillator light is split into two paths by optical coupler OC2. The signal light amplified by erbium-doped fiber amplifier EDFA and one of the local oscillator lights are coupled by optical coupler OC3. The signal light beats in photodetector PD1 to generate a millimeter-wave induction signal, which is then compensated for by millimeter-wave low-noise amplifier mmW-LNA1.

[0021] Another optical carrier is coupled to another local oscillator light via optical coupler OC4 after delay matching through optical delay line. After the optical power is adjusted by adjustable optical attenuator VOA, the signal is generated by beat frequency in photodetector PD2. The signal is then compensated by millimeter-wave low-noise amplifier mmW-LNA2 and split into downlink millimeter-wave local oscillator signal and reference millimeter-wave local oscillator signal by millimeter-wave power divider EC. The downlink millimeter-wave local oscillator signal is used for downlink communication, and the reference millimeter-wave local oscillator signal is used for uplink sensing.

[0022] The power-compensated millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal are polarized multiplexed by the orthogonal mode coupler OMT1. After multiplexing, the millimeter-wave inductive signal is denoted as H-polarization and the downlink millimeter-wave local oscillator signal is denoted as V-polarization. Then, it is radiated by antenna 1 to sense surrounding users in the air and communicate with them.

[0023] In the communication receiver, the millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal received by antenna 3 are first amplified by millimeter-wave low-noise amplifier mmW-LNA4, and then demultiplexed by orthogonal mode coupler OMT2. The downlink millimeter-wave local oscillator signal after demultiplexing is polarized to H-polarization by orthogonal polarization rotator. The downlink millimeter-wave local oscillator signal after polarization rotation and the millimeter-wave inductive signal after demultiplexing are mixed in mixer 2 and downconverted to baseband or intermediate frequency. The downconverted signal is amplified by intermediate frequency low-noise amplifier IF-LNA2, then sampled by analog-to-digital converter ADC2, and finally sent to communication DSP for processing to obtain downlink communication information.

[0024] In the sensing receiver, the echo of the millimeter-wave sensing signal reflected by the communication receiver is received by the antenna 2 of the sensing receiver. The antenna 2 amplifies the received millimeter-wave sensing signal through the millimeter-wave low-noise amplifier mmW-LNA3, and then mixes it with the reference millimeter-wave local oscillator signal from the sensing transmitter to convert it to the baseband or intermediate frequency. The down-converted signal is amplified by the intermediate frequency low-noise amplifier IF-LNA1, then sampled by the analog-to-digital converter ADC1, and finally sent to the sensing DSP for processing to obtain the uplink sensing information.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. This invention is applicable to future high-capacity, high-precision integrated communication and sensing mobile networks. At the transmitting end, based on a photonic-assisted architecture, the modulated optical carrier and local oscillator light are heterodyne-beat frequencyd to generate a millimeter-wave inductive signal; simultaneously, the unmodulated optical carrier and local oscillator light beat frequency to generate a millimeter-wave local oscillator signal with the same origin as the millimeter-wave inductive signal. The millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal are polarization-multiplexed by an orthogonal mode coupler (OMT1) before being transmitted. At the receiving end, the polarization demultiplexing of the millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal is achieved through an orthogonal mode coupler (OMT2), followed by polarization matching, i.e., converting the downlink millimeter-wave local oscillator signal into the same polarization state as the millimeter-wave inductive signal, and then mixing to achieve down-conversion of the downlink millimeter-wave inductive signal. Simultaneously, the downlink transmission of the downlink millimeter-wave local oscillator signal avoids the use of a down-conversion electrical local oscillator source at the receiving end and significantly reduces the frequency offset and phase noise of the down-converted millimeter-wave inductive signal. At the sensing receiver, the uplink millimeter-wave sensing signal is mixed with the reference millimeter-wave local oscillator signal from the transmitter to achieve uplink echo down-conversion. The mixing of the co-source millimeter-wave local oscillator signal and the millimeter-wave sensing signal significantly reduces the frequency offset and phase noise of the down-converted sensing signal, thereby improving the radar's detection accuracy. Furthermore, the radar and communication waveforms used are consistent with existing independent sensing systems, requiring no specific modifications and easily compatible with existing communication and sensing algorithms.

[0027] 2. This invention first utilizes a photonics-assisted network architecture. One optical carrier is modulated by a baseband or intermediate frequency inductive signal at the transmitting end, and then coupled with a local oscillator to generate a millimeter-wave inductive signal by beat frequency. Simultaneously, the optical carrier, after optical delay, is coupled with another local oscillator to generate a millimeter-wave local oscillator signal by beat frequency. The millimeter-wave local oscillator signal is split into two paths: one is used as a reference millimeter-wave local oscillator signal at the sensing receiver, and the other is polarized and multiplexed with the millimeter-wave inductive signal before being transmitted. At the communication receiver, the polarized and demultiplexed millimeter-wave inductive signal and the demultiplexed millimeter-wave local oscillator signal are polarized and then mixed to avoid the use of a down-conversion electrical local oscillator source. At the sensing receiver, the echo of the millimeter-wave inductive signal is mixed with the reference millimeter-wave local oscillator signal to achieve echo down-conversion. Since the millimeter-wave inductive signal and the millimeter-wave local oscillator signal have the same phase noise, the frequency offset and phase noise of the down-converted millimeter-wave communication signal and the sensing echo can be reduced, thereby reducing the complexity and power consumption of the communication DSP and sensing DSP, and improving the detection accuracy of the radar. Attached Figure Description

[0028] Figure 1 This is an overall schematic diagram of an embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram illustrating the principle of a synesthetic sideband generator in an embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram illustrating alternative components for optical delay lines and adjustable optical attenuators (VOAs) in an embodiment of the present invention. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings.

[0032] After reading this specification, those skilled in the art may make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0035] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0036] Reference Figure 1 This application discloses a photonic millimeter-wave communication sensing fusion architecture system, which includes a sensing transmitter, a sensing receiver, and n communication receivers, where n is a positive integer.

[0037] Reference Figure 1 The inductive transmitter includes two external cavity lasers, four optical couplers (OC), an inductive sideband generator, an optical delay line, an adjustable optical attenuator (VOA), an erbium-doped fiber amplifier (EDFA), two photodetectors (PD), two millimeter-wave low-noise amplifiers (mmW-LNA), a millimeter-wave power divider (EC), an orthogonal mode coupler (OMT1), and an antenna (1).

[0038] Specifically:

[0039] The two external cavity lasers are the optical carrier and the local oscillator, respectively;

[0040] The four optical couplers OC are optical coupler OC1, optical coupler OC2, optical coupler OC3 and optical coupler OC4;

[0041] Reference Figure 2 The inductive sideband generator includes an IQ modulator, a digital-to-analog converter (DAC), and a transmitter DSP.

[0042] Reference Figure 3 The optical delay line is an optical delay matching module. In this embodiment, the optical delay matching module is an optical delay line. In other embodiments, the optical delay matching module may also be other electronic components that can realize the function of an optical delay line.

[0043] Reference Figure 3 The adjustable optical attenuator (VOA) is an optical power control module. In this embodiment, the optical power control module is an adjustable optical attenuator (VOA). In other embodiments, the optical power control module may also be other electronic components that can realize the function of the adjustable optical attenuator (VOA).

[0044] The two photodetectors PD are photodetector PD1 and photodetector PD2, respectively.

[0045] The two millimeter-wave low-noise amplifiers (mmW-LNAs) are mmW-LNA1 and mmW-LNA2, respectively.

[0046] Reference Figure 1 The sensing receiver includes a millimeter-wave low-noise amplifier mmW-LNA3, an intermediate frequency low-noise amplifier IF-LNA1, a mixer 1, an analog-to-digital converter ADC1, a sensing DSP, and an antenna 2.

[0047] Sen.DSP was selected for the sensing DSP.

[0048] Reference Figure 1 Each communication receiver includes a millimeter-wave low-noise amplifier mmW-LNA4, an intermediate-frequency low-noise amplifier IF-LNA2, an orthogonal-mode coupler OMT2, an orthogonal polarization rotator, a mixer 2, an analog-to-digital converter ADC2, a communication DSP, and an antenna 3.

[0049] Com.DSP was selected for communication.

[0050] The sensing receiver and the sensing transmitter are connected by optical fiber and wireless connection, and the communication receiver and the sensing transmitter are connected wirelessly.

[0051] This application also discloses a low phase noise receiving method for a photonic millimeter-wave communication sensing fusion architecture, which is applied to a photonic millimeter-wave communication sensing fusion architecture system disclosed in the above embodiments.

[0052] Reference Figures 1 to 3The low phase noise receiving method for photonic millimeter-wave communication sensing fusion architecture specifically includes the following steps:

[0053] In the sensing transmitter, the baseband or intermediate frequency sensing digital signal generated by the transmitter DSP is converted into a baseband or intermediate frequency analog sensing signal by the digital-to-analog converter DAC. The optical carrier is split into two paths by the optical coupler OC1. One of the optical carriers is modulated by the baseband or intermediate frequency analog sensing signal through the IQ modulator to generate a modulated optical carrier for communication sensing fusion, which is denoted as the signal light.

[0054] The local oscillator light is split into two paths by optical coupler OC2. The signal light amplified by erbium-doped fiber amplifier EDFA and one of the local oscillator lights are coupled by optical coupler OC3. The signal light beats in photodetector PD1 to generate a millimeter-wave induction signal, which is then compensated for by millimeter-wave low-noise amplifier mmW-LNA1.

[0055] Another optical carrier is coupled to another local oscillator light via optical coupler OC4 after delay matching through optical delay line. After the optical power is adjusted by adjustable optical attenuator VOA, the signal is generated by beat frequency in photodetector PD2. The signal is then compensated by millimeter-wave low-noise amplifier mmW-LNA2 and split into downlink millimeter-wave local oscillator signal and reference millimeter-wave local oscillator signal by millimeter-wave power divider EC. The downlink millimeter-wave local oscillator signal is used for downlink communication, and the reference millimeter-wave local oscillator signal is used for uplink sensing.

[0056] The power-compensated millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal are polarized multiplexed by the orthogonal mode coupler OMT1. After multiplexing, the millimeter-wave inductive signal is denoted as H-polarization and the downlink millimeter-wave local oscillator signal is denoted as V-polarization. Then, it is radiated by antenna 1 to sense surrounding users in the air and communicate with them.

[0057] In the communication receiver, the millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal received by antenna 3 are first amplified by millimeter-wave low-noise amplifier mmW-LNA4, and then demultiplexed by orthogonal mode coupler OMT2. The downlink millimeter-wave local oscillator signal after demultiplexing is polarized to H-polarization by orthogonal polarization rotator. The downlink millimeter-wave local oscillator signal after polarization rotation and the millimeter-wave inductive signal after demultiplexing are mixed in mixer 2 and downconverted to baseband or intermediate frequency. The downconverted signal is amplified by intermediate frequency low-noise amplifier IF-LNA2, then sampled by analog-to-digital converter ADC2, and finally sent to Com.DSP for processing to obtain downlink communication information.

[0058] In the sensing receiver, the echo of the millimeter-wave sensing signal reflected by the communication receiver is received by the antenna 2 of the sensing receiver. The antenna 2 amplifies the received millimeter-wave sensing signal through the millimeter-wave low-noise amplifier mmW-LNA3, and then mixes it with the reference millimeter-wave local oscillator signal from the sensing transmitter to convert it to the baseband or intermediate frequency. The down-converted signal is amplified by the intermediate frequency low-noise amplifier IF-LNA1, then sampled by the analog-to-digital converter ADC1, and finally sent to Sen.DSP for processing to obtain the uplink sensing information.

[0059] The above embodiments offer the following advantages:

[0060] (1) Phase noise:

[0061] Millimeter-wave sensing signals and millimeter-wave local oscillator signals have the same phase noise. After mixing, the frequency offset and phase noise caused by the incoherence between the signal light and the local oscillator light are eliminated. At the sensing receiver, the frequency offset and phase noise of the down-converted millimeter-wave sensing signal are reduced, thereby improving the detection accuracy of the radar. At the communication receiver, the use of down-converted electrical local oscillators is avoided, reducing the frequency offset and phase noise of the down-converted millimeter-wave communication signal, thereby reducing the complexity and power consumption of the DSP at the communication receiver.

[0062] (2) Two advantages compared to envelope detection in reducing phase noise of received millimeter-wave signals:

[0063] At the transmitting end, the millimeter-wave local oscillator signal and the millimeter-wave inductive signal are generated by parallel beat frequency generation using dual photodiodes (PDs). Compared with the single-PD beat frequency method using envelope detection, this significantly reduces the optical power entering the PD. Furthermore, it avoids the auxiliary optical carrier required for envelope detection, further reducing the input optical power of the PD and preventing premature saturation. Therefore, it achieves a higher signal-to-noise ratio and higher output power for the inductive signal.

[0064] At the communication receiver, the millimeter-wave local oscillator signal and the millimeter-wave inductive signal are transmitted with polarization separation and can be amplified separately, resulting in a larger receiving bandwidth and a higher signal-to-noise ratio compared with the envelope detection method.

[0065] (3) Uplink communication architecture:

[0066] The millimeter-wave local oscillator signal separated at the communication receiver can also be used for up-conversion of the uplink millimeter-wave communication signal, further reducing the cost at the user end.

[0067] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0068] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A low-phase-noise receiving method for a photonic millimeter-wave communication sensing fusion architecture, characterized in that, Includes the following steps: In the sensing transmitter, the baseband or intermediate frequency sensing digital signal generated by the transmitter DSP is converted into a baseband or intermediate frequency analog sensing signal by the digital-to-analog converter DAC. The optical carrier is split into two paths by the optical coupler OC1. One of the optical carriers is modulated by the baseband or intermediate frequency analog sensing signal through the IQ modulator to generate a modulated optical carrier for communication sensing fusion, which is denoted as the signal light. The local oscillator light is split into two paths by optical coupler OC2. The signal light amplified by erbium-doped fiber amplifier EDFA and one of the local oscillator lights are coupled by optical coupler OC3. The signal light beats in photodetector PD1 to generate a millimeter-wave induction signal, which is then compensated for by millimeter-wave low-noise amplifier mmW-LNA1. Another optical carrier is coupled to another local oscillator light via optical coupler OC4 after delay matching through optical delay line. After the optical power is adjusted by adjustable optical attenuator VOA, the signal is generated by beat frequency in photodetector PD2. The signal is then compensated by millimeter-wave low-noise amplifier mmW-LNA2 and split into downlink millimeter-wave local oscillator signal and reference millimeter-wave local oscillator signal by millimeter-wave power divider EC. The downlink millimeter-wave local oscillator signal is used for downlink communication, and the reference millimeter-wave local oscillator signal is used for uplink sensing. The power-compensated millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal are polarized multiplexed by the orthogonal mode coupler OMT1. After multiplexing, the millimeter-wave inductive signal is denoted as H-polarization and the downlink millimeter-wave local oscillator signal is denoted as V-polarization. Then, it is radiated by antenna 1 to sense surrounding users in the air and communicate with them. In the communication receiver, the millimeter-wave inductive signal and the downlink millimeter-wave local oscillator signal received by antenna 3 are first amplified by millimeter-wave low-noise amplifier mmW-LNA4, and then demultiplexed by orthogonal mode coupler OMT2. The downlink millimeter-wave local oscillator signal after demultiplexing is polarized to H-polarization by orthogonal polarization rotator. The downlink millimeter-wave local oscillator signal after polarization rotation and the millimeter-wave inductive signal after demultiplexing are mixed in mixer 2 and downconverted to baseband or intermediate frequency. The downconverted signal is amplified by intermediate frequency low-noise amplifier IF-LNA2, then sampled by analog-to-digital converter ADC2, and finally sent to communication DSP for processing to obtain downlink communication information. In the sensing receiver, the echo of the millimeter-wave sensing signal reflected by the communication receiver is received by the antenna 2 of the sensing receiver. The antenna 2 amplifies the received millimeter-wave sensing signal through the millimeter-wave low-noise amplifier mmW-LNA3, and then mixes it with the reference millimeter-wave local oscillator signal from the sensing transmitter to convert it to the baseband or intermediate frequency. The down-converted signal is amplified by the intermediate frequency low-noise amplifier IF-LNA1, then sampled by the analog-to-digital converter ADC1, and finally sent to the sensing DSP for processing to obtain the uplink sensing information.

2. A photonic millimeter-wave communication sensing fusion architecture system, applied to the low phase noise receiving method of the photonic millimeter-wave communication sensing fusion architecture described in claim 1, characterized in that it comprises: The inductive transmitter includes two external cavity lasers, four optical couplers (OC), an inductive sideband generator, an optical delay line, an adjustable optical attenuator (VOA), an erbium-doped fiber amplifier (EDFA), two photodetectors (PD), two millimeter-wave low-noise amplifiers (mmW-LNA), a millimeter-wave power divider (EC), an orthogonal mode coupler (OMT1), and an antenna (1). The sensing receiver includes a millimeter-wave low-noise amplifier mmW-LNA3, an intermediate frequency low-noise amplifier IF-LNA1, a mixer 1, an analog-to-digital converter ADC1, a sensing DSP, and an antenna 2. The communication receiver includes a millimeter-wave low-noise amplifier mmW-LNA4, an intermediate-frequency low-noise amplifier IF-LNA2, an orthogonal-mode coupler OMT2, an orthogonal polarization rotator, a mixer 2, an analog-to-digital converter ADC2, a communication DSP, and an antenna 3; The sensing receiver and the sensing transmitter are connected by optical fiber and wireless connection, and the communication receiver and the sensing transmitter are connected wirelessly.

3. The photonic millimeter-wave communication sensing fusion architecture system according to claim 2, characterized in that, The inductive sideband generator includes an IQ modulator, a digital-to-analog converter (DAC), and a transmitter DSP.

4. The photonic millimeter-wave communication sensing fusion architecture system according to claim 3, characterized in that, The number of communication receivers is n, where n is a positive integer; The two external cavity lasers are the optical carrier and the local oscillator, respectively; The four optical couplers OC are optical coupler OC1, optical coupler OC2, optical coupler OC3 and optical coupler OC4; The two photodetectors PD are photodetector PD1 and photodetector PD2, respectively. The two millimeter-wave low-noise amplifiers (mmW-LNAs) are mmW-LNA1 and mmW-LNA2, respectively.

Images