Light-operated millimeter wave phased array communication system and communication method

Abstract

The invention provides a light-operated millimeter wave phased array communication system and method, and the system comprises a transmitting end and a receiving end, the transmitting end generates a plurality of single carrier signals and a plurality of OFDM signals which carry transmission information, carries out the frequency division multiplexing of the plurality of carrier signals, obtains a DSCM signal, modulates the DSCM signal into a coupling optical signal, and transmits the coupling optical signal to the receiving end. Transmitting the coupled optical signal based on an optical true time delay network to obtain multiple paths of optical signals with time delay difference, converting the optical signals into multiple directional millimeter wave signals with beam directivity in different user directions, modulating the multiple received millimeter wave signals into multiple optical carrier signals by a receiving end, and transmitting the multiple optical carrier signals to the receiving end; and demodulating the plurality of optical carrier signals into a plurality of digital carrier signals, and extracting transmission information carried by each of the plurality of digital carrier signals. According to the system, accurate time delay compensation can be applied to different frequency components through the optical true time delay network, so that beam focusing in different user directions is realized, and the multi-user communication quality is improved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of communication system technology, and more specifically, to an optically controlled millimeter-wave phased array communication system and communication method. Background Technology

[0002] Millimeter wave and terahertz bands, due to their extremely high bandwidth and dense multiplexing capabilities, have become key technologies supporting high-speed data transmission for multiple users. These high-frequency signals can simultaneously serve a large number of users, meeting the high-throughput requirements of scenarios such as smart factories, connected vehicles, and large-capacity outdoor hotspots. Radio-over-fiber (RoF) systems load wireless radio frequency signals onto optical carriers, utilizing optical fibers to achieve long-distance, low-loss transmission while maintaining the high flexibility of wireless communication.

[0003] Traditional RoF links typically employ a simple "optical modulation—fiber optic transmission—photoelectric conversion—antenna transmission" model, enabling only unidirectional signal transmission and making it difficult to support simultaneous directional communication by multiple users. Existing technologies can combine RoF links with phased array beamforming technology, achieving both directional coverage and increased transmission capacity. However, current technologies use electrical phase shifters to apply the same phase adjustment to all frequency components of the broadband signal, resulting in significant beam direction shifts in subcarriers at the frequency band edges, thus affecting communication quality. Summary of the Invention

[0004] The embodiments described herein provide a light-controlled millimeter-wave phased array communication system and method that can achieve beam focusing in different user directions to reduce beam direction offset and thus improve communication quality.

[0005] In a first aspect, this disclosure provides an optically controlled millimeter-wave phased array communication system, comprising: The transmitting end is used to generate multiple single-carrier signals and multiple orthogonal frequency division multiplexing (OFDM) signals carrying transmission information, perform frequency division multiplexing on the multiple carrier signals to obtain digital subcarrier multiplexing (DSCM) signals, modulate the DSCM signals into coupled optical signals, transmit the coupled optical signals based on an optical true delay network to obtain multiple optical signals with time delay differences, and convert the multiple optical signals with time delay differences into multiple directional millimeter-wave signals with beam directionality in different user directions; the receiving end is used to receive multiple millimeter-wave signals, modulate the multiple millimeter-wave signals into multiple optical carrier signals, demodulate the multiple optical carrier signals into multiple digital carrier signals, and extract the transmission information carried by each of the multiple digital carrier signals.

[0006] The transmitting end includes an antenna array and an optical true delay network. Multiple user directions, multiple digital carrier signals, multiple optical carrier signals, multiple directional millimeter wave signals, multiple carrier signals, multiple optical true delay channel groups in the optical true delay network, and multiple antenna subarrays in the antenna array correspond one-to-one. Multiple antenna elements in the antenna subarray correspond one-to-one with multiple optical true delay channels in the optical true delay channel groups.

[0007] In some embodiments of this disclosure, the transmitting end further includes: A modulation module is used to modulate the DSCM signal into an optical signal and couple it with an optical carrier used for heterodyne beat frequency to form a coupled optical signal; an optical splitter network is used to split the coupled optical signal into multiple coupled optical signals and provide the multiple coupled optical signals to the optical true delay network; the optical true delay network is used to apply the time delay of each optical true delay channel in the corresponding optical true delay channel group to the corresponding coupled optical signal for each user to obtain a time delay modulated optical signal; a photodetector array is used to perform photoelectric conversion on each of the multiple time delay modulated optical signals to obtain multiple directional millimeter wave signals to compensate for the time delay difference of different antenna elements in the corresponding antenna subarray when transmitting signals.

[0008] The multi-channel coupled optical signal, the multi-channel time-delay modulated optical signal, and the multiple photodetectors in the photodetector array correspond one-to-one with the multiple optical true delay channels in the optical true delay network.

[0009] In some embodiments of this disclosure, the phase difference of each antenna element during signal transmission is... exp [ -i 2 π fd ( n -1) sinth m / c The corresponding delay of the optical true delay channel is ( n- 1) d sinth m / c ;in, n This represents the index number of the antenna element in the corresponding antenna subarray. d The spacing between the antenna elements. i m For the corresponding user direction, c At the speed of light, f The frequency of the millimeter-wave signal is denoted as .

[0010] In some embodiments of this disclosure, the modulation module includes: An optical IQ modulator is used to modulate the DSCM signal into a photonic carrier multiplexed signal; an optical coupler is used to couple the photonic carrier multiplexed signal with a local oscillator optical signal to obtain the coupled optical signal.

[0011] In some embodiments of this disclosure, the transmitting end further includes: The first digital signal processor is used to perform upsampling, root-raised cosine filtering and upconversion processing on each carrier signal to obtain multiple digital subcarrier signals, and to perform frequency division multiplexing on the multiple digital subcarrier signals to obtain the DSCM signal.

[0012] In some embodiments of this disclosure, the plurality of digital subcarrier signals include a plurality of digital subcarrier signal pairs, wherein the center frequency of any digital subcarrier signal pair is - BW (2 x- 1 +α ) / 2 and BW (2 x- 1 +α ) / 2, where, BW The bandwidth of the DSCM signal. α The roll-off factor of the root-raised cosine filter. x The digital subcarrier signal pair is ordered among the plurality of digital subcarrier signal pairs.

[0013] In some embodiments of this disclosure, the receiving end includes multiple modulation channels, each of which corresponds one-to-one with the multiple directional millimeter-wave signals.

[0014] Each modulation channel includes: A mixer is used to mix a millimeter-wave signal with a local oscillator signal to obtain an intermediate frequency signal carrying the transmitted information; an electro-optic intensity modulator is used to modulate an intermediate frequency signal onto an optical carrier to obtain an optical carrier signal.

[0015] In some embodiments of this disclosure, the receiving end includes multiple receiving channels, each of which corresponds one-to-one with a plurality of optical carrier signals.

[0016] Each receiving channel is used to perform coherent detection on an optical carrier signal based on a local oscillation optical signal, and then perform analog-to-digital conversion to obtain a digital carrier signal.

[0017] In some embodiments of this disclosure, the receiving end includes: The second digital signal processor is used to perform down-conversion, low-pass filtering, clock recovery and carrier demodulation processing on each of the plurality of digital carrier signals to obtain the transmission information corresponding to the different user directions.

[0018] Secondly, this disclosure provides a communication method applied to any of the optically controlled millimeter-wave phased array communication systems provided in the first aspect, and executed by the transmitting end in the optically controlled millimeter-wave phased array communication system. The communication method includes: The process involves generating multiple single-carrier signals and multiple OFDM signals carrying transmission information; processing the multiple carrier signals to obtain DSCM signals; modulating the DSCM signals into coupled optical signals; transmitting the coupled optical signals based on an optical true delay network to obtain multiple optical signals with time delay differences; converting the multiple optical signals with time delay differences into multiple directional millimeter-wave signals with beam directionality in different user directions; transmitting the multiple directional millimeter-wave signals to a receiving end to receive the multiple millimeter-wave signals; modulating the multiple millimeter-wave signals into multiple optical carrier signals; demodulating the multiple optical carrier signals into multiple digital carrier signals; and extracting the transmission information carried by each of the multiple digital carrier signals.

[0019] Among them, the multiple carrier signals, multiple user directions, multiple directional millimeter wave signals, multiple optical carrier signals and multiple digital carrier signals correspond one-to-one.

[0020] The technical solution provided in this disclosure includes a light-controlled millimeter-wave phased array communication system comprising a transmitter and a receiver. The transmitter generates multiple single-carrier signals and multiple OFDM signals carrying transmission information. It processes the multiple carrier signals to obtain a DSCM signal, modulates the DSCM signal into a coupled optical signal, and transmits the coupled optical signal based on an optical true delay network to obtain multiple optical signals with time delay differences. These multiple optical signals with time delay differences are then converted into multiple directional millimeter-wave signals with beam directionality in different user directions. The receiver receives the multiple millimeter-wave signals, modulates them into multiple optical carrier signals, demodulates them into multiple digital carrier signals, and extracts the transmission information carried by each digital carrier signal. This allows for accurate time delay compensation to be applied to different frequency components, enabling beam focusing of the millimeter-wave signals in different user directions, reducing beam direction offset, and ensuring consistent beam directionality across the entire frequency band. This guarantees stable directional transmission across the entire bandwidth, thereby improving the communication quality for multiple users.

[0021] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings: Figure 1 This is a schematic diagram of the structure of a light-controlled millimeter-wave phased array communication system provided in an embodiment of this disclosure.

[0023] Figure 2 This is a schematic diagram of the structure of a transmitter provided in an embodiment of the present disclosure.

[0024] Figure 3 This is a schematic diagram of a receiving end provided in an embodiment of the present disclosure.

[0025] Figure 4 This is a flowchart illustrating a communication method provided in an embodiment of the present disclosure. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are also within the scope of protection of this disclosure.

[0027] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms such as those defined in commonly used dictionaries shall be interpreted as having the meaning consistent with their meaning in the context of the specification and in the relevant art, and shall not be interpreted in an idealized or overly formal form unless otherwise explicitly defined herein. As used herein, the statement of “electrically connecting” two or more parts together shall mean that these parts are joined directly together or joined through one or more intermediate components.

[0028] In this disclosure, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this disclosure can be combined with other embodiments.

[0029] Furthermore, the terms "first," "second," etc., in the specification, claims, or the accompanying drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0030] In this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0031] In the description of this disclosure, unless otherwise stated, "multiple" and "at least two" mean two or more (including two), and similarly, "multiple groups" and "at least two groups" mean two or more (including two groups).

[0032] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0033] RoF (RoboF) technology typically employs a "optical modulation-fiber transmission-photoelectric conversion-antenna transmission" model. The signal is modulated onto an optical carrier and transmitted via fiber to a remote base station. The base station performs photoelectric conversion to generate millimeter-wave / terahertz signals, which are then radiated to the user end via an antenna. Phased array beamforming technology typically uses electrically controlled phase shifters to apply a fixed phase shift to different frequency components of the signal. Combining these two technologies results in a communication system that can achieve long-distance, low-loss signal transmission and support simultaneous directional communication by multiple users.

[0034] However, applying the same phase adjustment to different frequency components in the above communication system causes the beam direction of subcarriers of different frequencies to shift when processing broadband signals, resulting in beam squint. This leads to inconsistent signal angles received by multiple users, affecting spectral efficiency and user experience, causing angle deviation and sideband mismatch problems, and ultimately affecting communication quality.

[0035] To address the aforementioned technical issues, this disclosure provides an optically controlled millimeter-wave phased array communication system. The system includes a transmitter and a receiver. The transmitter generates multiple single-carrier signals and multiple OFDM signals carrying transmission information. It processes the multiple carrier signals to obtain a Digital Subcarrier Multiplexed (DSCM) signal, modulates the DSCM signal into a coupled optical signal, and transmits the coupled optical signal based on an optical true delay network, resulting in multiple optical signals with time delay differences. These multiple optical signals with time delay differences are then converted into multiple directional millimeter-wave signals with beam directionality in different user directions. The receiver receives the multiple millimeter-wave signals, modulates the directional millimeter-wave signals into multiple optical carrier signals, demodulates the multiple optical carrier signals into multiple digital carrier signals, and extracts the transmission information carried by each digital carrier signal. This allows for accurate time delay compensation to be applied to different frequency components, enabling beam focusing of the millimeter-wave signals in different user directions, reducing beam direction offset, and ensuring consistent beam directionality across the entire frequency band. This guarantees stable directional transmission across the entire bandwidth, thereby improving the communication quality for multiple users.

[0036] The technical solutions in this disclosure are described in detail below with reference to several specific embodiments.

[0037] Figure 1 This is a schematic diagram of the structure of a light-controlled millimeter-wave phased array communication system provided in an embodiment of this disclosure, as shown below. Figure 1 As shown, the optically controlled millimeter-wave phased array communication system includes: The transmitter 100 is used to generate multiple single-carrier signals (SCMS) and multiple OFDM signals carrying transmission information, perform frequency division multiplexing on the multiple carrier signals (CMS) to obtain DSCM signals, modulate the DSCM signals into coupled optical signals, transmit the coupled optical signals based on an optical true delay network to obtain multiple optical signals with time delay differences, and convert the multiple optical signals with time delay differences into multiple directional millimeter-wave signals (DMVS) with beam directionality in different user directions.

[0038] The receiver 200 is used to receive multiple millimeter-wave signals MVS, modulate the multiple millimeter-wave signals MVS into multiple optical carrier signals OCMS, demodulate the multiple optical carrier signals OCMS into multiple digital carrier signals DCMS, and extract the transmission information carried by each of the multiple digital carrier signals DCMS.

[0039] The transmitting end 100 includes an antenna array 110 and an optical true delay network 120. Multiple user directions, multiple digital carrier signals (DCMS), multiple optical carrier signals (OCMS), multiple directional millimeter wave signals (DMVS), multiple carrier signals (CMS), multiple optical true delay channel groups 121 in the optical true delay network 120, and multiple antenna subarrays 111 in the antenna array 110 correspond one-to-one. Multiple antenna elements 1111 in the antenna subarray 111 correspond one-to-one with multiple optical true delay channels 1211 in the optical true delay channel group 121.

[0040] For example, Figure 2 This is a schematic diagram of the structure of a transmitter provided in an embodiment of the present disclosure, such as... Figure 2 As shown, the transmitter 100 also includes a first digital signal processor DSP1, which includes multiple subcarrier modules, an I-channel multiplexer 1, and a Q-channel multiplexer 2. The number of subcarrier modules is an integer greater than or equal to 4.

[0041] In this configuration, the in-phase channel of each subcarrier module is connected to the input of the I-channel multiplexer 1, and the positive-channel channel of each subcarrier module is connected to the input of the Q-channel multiplexer 2.

[0042] First, each of the multiple subcarrier modules generates a pseudo-random binary sequence (PRBS), which represents the user's transmitted information. The multiple subcarrier modules can be divided into a single-carrier transmitter DSP module and an OFDM transmitter DSP module.

[0043] Then, each single-carrier transmitter DSP module performs single-carrier modulation on the generated pseudo-random binary sequence PRBS to obtain a single-carrier signal SCMS, and each OFDM transmitter DSP module performs OFDM modulation on the generated pseudo-random binary sequence PRBS to obtain an OFDM signal. The bandwidth and modulation format of both the single-carrier signal SCMS and the OFDM signal can be flexibly set. The multiple carrier signals CMS include multiple single-carrier signals SCMS and multiple OFDM signals.

[0044] Next, each subcarrier module upsamples the corresponding carrier signal CMS to meet the sampling rate of the subsequent digital-to-analog converter (DAC). The upsampled carrier signal is then subjected to root-raised cosine filtering to perform RC shaping on the carrier signal CMS, and the filtered carrier signal is then upconverted to obtain a digital subcarrier signal.

[0045] DSCM signals comprise multiple digital subcarrier signals. For example, when the number of users is even, the multiple digital subcarrier signals are divided into multiple digital subcarrier signal pairs, with the center frequency of any digital subcarrier signal pair being - BW (2 x- 1 +α ) / 2 and BW (2 x- 1 +α ) / 2, where, BW The bandwidth of the DSCM signal. α The roll-off factor of the root-raised cosine filter. x The digital subcarrier signal pair is ordered among multiple digital subcarrier signal pairs so that each digital subcarrier signal can maintain a certain frequency interval without wasting too much bandwidth resources.

[0046] For example, such as Figure 2 As shown, in a system supporting four-user directional communication, the first digital signal processor DSP1 includes four subcarrier modules: subcarrier module 1, subcarrier module 2, subcarrier module 3, and subcarrier module 4. Subcarrier module 1 generates a pseudo-random binary sequence PRBS1, performs single-carrier modulation on PRBS1 to obtain a single-carrier signal SCMS1 (carrier signal CMS1), and performs upsampling, root-raised cosine filtering, and up-conversion on SCMS1 (carrier signal CMS1) to obtain a center frequency of - BW (1 +α ) / 2 digital subcarrier signal 1.

[0047] Subcarrier module 2 generates a pseudo-random binary sequence PRBS2. Single-carrier modulation is applied to PRBS2 to obtain a single-carrier signal SCMS2 (carrier signal CMS2). SCMS2 (carrier signal CMS2) is then upsampled, root-raised cosine filtered, and up-converted to obtain a center frequency of... BW (1 +α The digital subcarrier signal 2 is 2 / 2, and the digital subcarrier signal 2 and the digital subcarrier signal 1 form a digital subcarrier signal pair.

[0048] Subcarrier module 3 generates a pseudo-random binary sequence PRBS3. Multicarrier modulation is applied to PRBS3 to obtain OFDM signal 1 (carrier signal CMS3). OFDM signal 1 (carrier signal CMS3) is then upsampled, root-raised cosine filtered, and up-converted to obtain a center frequency of - BW (3 +α ) / 2 digital subcarrier signal 3.

[0049] Subcarrier module 4 generates a pseudo-random binary sequence PRBS4. Multi-carrier modulation is applied to PRBS4 to obtain OFDM signal 2 (carrier signal CMS4). OFDM signal 2 (carrier signal CMS4) is then upsampled, root-raised cosine filtered, and up-converted to obtain a center frequency of... BW (3 +α The digital subcarrier signal 4 is 2 / 2, and the digital subcarrier signal 4 and the digital subcarrier signal 3 constitute another digital subcarrier signal pair.

[0050] Finally, the I-channel multiplexer 1 receives the in-phase components I1, I2, I3, and I4 of each digital subcarrier signal, and performs time-domain superposition of the received in-phase components I1, I2, I3, and I4 to obtain the in-phase component I of the DSCM signal. The Q-channel multiplexer 2 receives the quadrature components Q1, Q2, Q3, and Q4 of each subcarrier signal, and performs time-domain superposition of the received quadrature components Q1, Q2, Q3, and Q4 to obtain the quadrature component Q of the DSCM signal.

[0051] Thus, the first digital signal processor DSP1 can perform upsampling, root-raised cosine filtering, and upconversion processing on each carrier signal CMS to obtain multiple digital subcarrier signals, and then perform frequency division multiplexing on the multiple digital subcarrier signals to obtain the DSCM signal.

[0052] It should be noted that, Figure 2 The first digital signal processor DSP1 is shown as an example only, including four subcarrier modules. In actual applications, the number of subcarrier modules can be any integer, such as five or more, depending on the number of users, i.e. the number of user directions. This disclosure does not impose any specific restrictions on this.

[0053] For example, see [link to example]. Figure 2 As shown, the transmitting end 100 also includes a first digital-to-analog converter (DAC1) and a second digital-to-analog converter (DAC2). The input of the first DAC1 is connected to the output of an I-channel multiplexer 1 to perform digital-to-analog conversion on the in-phase component I of the DSCM signal to obtain an analog in-phase component I'. The input of the second DAC2 is connected to the output of a Q-channel multiplexer 2 to perform digital-to-analog conversion on the quadrature component Q of the DSCM signal to obtain an analog quadrature component Q'.

[0054] The transmitter 100 also includes a photodetector array 130, a modulation module 140, and an optical splitter network 150. The modulation module 140 includes an optical IQ modulator 141 and an optical coupler 142.

[0055] The output of the first digital-to-analog converter (DAC1) is connected to the first input of the optical IQ modulator (141), and the input of the second digital-to-analog converter (DAC2) is connected to the second input of the optical IQ modulator (141). The light source of the optical IQ modulator (141) operates at a frequency of... f c The laser ECL1 and the optical IQ modulator 141 perform electro-optic conversion based on the analog in-phase component I' and analog quadrature component Q' of the DSCM signal to modulate the DSCM signal into an optical carrier multiplexed signal OSCMS.

[0056] The first input of the optical coupler 142 receives the optical carrier multiplexed signal OSCMS, and the second input of the optical coupler 142 receives the operating frequency emitted by the laser ECL2. f c +f s The local oscillating optical signal is obtained, and the optical subcarrier multiplexing signal OSCMS is coupled to the local oscillating optical signal to obtain a coupled optical signal.

[0057] The optical splitter network 150 includes multiple optical splitters, which can split a single coupled optical signal into multiple coupled optical signals. The multiple coupled optical signals correspond one-to-one with multiple optical true delay channels 1211 in the optical true delay network 120.

[0058] Thus, the modulation module 130 can modulate the DSCM signal into an optical signal and couple it with the optical carrier used for heterodyne beat frequency to form a coupled optical signal. The optical splitter network 150 can split the coupled optical signal into multiple coupled optical signals and provide the multiple coupled optical signals to the optical true delay network 120.

[0059] The phase difference of each antenna element 1111 during signal transmission is: exp [ -i 2 pfd ( n -1) sinth m / c ],in, n This is the index number of antenna element 1111 in the corresponding antenna subarray 111. d The spacing of antenna elements 1111 and d=c / ( fs 2), fs The carrier frequency of the millimeter-wave signal MVS. i m For the corresponding user direction, c At the speed of light, fThis is the frequency of the millimeter-wave signal MVS. Therefore, the time delay of the corresponding optical true delay channel 1211 can be set to ( n- 1) d sinth m / c .

[0060] For the same user direction i m After the coupled optical signal is transmitted through the corresponding optical true delay channel 1211, the optical true delay channel 1211 can apply the delay amount to the coupled optical signal to compensate for the delay of the coupled optical signal and obtain the delay-controlled optical signal.

[0061] The photodetector array 130 includes multiple photodetectors, and each photodetector in the photodetector array 130 corresponds one-to-one with a multiple optical true delay channel 1211 in the optical true delay network 120, such as... Figure 1 As shown. Each time-delay modulated optical signal in the multi-channel time-delay modulated optical signal forms a beat frequency on the corresponding photodetector. The photodetector array 130 can then perform photoelectric conversion on each time-delay modulated optical signal in the multi-channel time-delay modulated optical signal to obtain a difference frequency signal (frequency). f s (components), frequency harmonic signal (frequency 2) f c Components and / or frequencies 2 f c +2 f s (components) and sum-frequency signals (frequency 2) f c +f s The components). Among them, the difference frequency signal (frequency) f s The component of the signal is the directional millimeter-wave signal DMVS.

[0062] The directional millimeter-wave signal DMVS is transmitted through the corresponding antenna element 1111. The delay compensation amount of the directional millimeter-wave signal DMVS, that is, the delay compensation amount of the delay-controlled optical signal, can compensate for the phase difference of the antenna element 1111 when transmitting the directional millimeter-wave signal DMVS, so that the receiver receives the millimeter-wave signal MVS. That is, the delay amount of the optical true delay channel 1211 can compensate for the delay difference of the corresponding antenna element 1111 when transmitting the directional millimeter-wave signal DMVS, so that the millimeter-wave signal MVS is in phase enhanced, and the beam focusing of the millimeter-wave signal MVS is realized in different user directions.

[0063] For example, in the above-described system supporting four-user directional communication, 1 16 antenna arrays 110, 1 The 16-antenna array 110 is divided into four independent and continuous 1 The antenna subarrays 111 of 4 are 111_1, 111_2, 111_3 and 111_4 respectively, and the corresponding optical true delay network 120 includes four optical true delay channel groups 121, which are 121_1, 121_2, 121_3 and 121_4 respectively.

[0064] The four users each correspond to a different user direction, that is... i 1. i 2. i 3 and i 4, i 1 corresponds to antenna subarray 111_1 and optical true delay channel group 121_1. i 2 corresponds to antenna subarray 111_2 and optical true delay channel group 121_2. i 3 corresponds to antenna subarray 111_3 and optical true delay channel group 121_3. i 4 corresponds to antenna subarray 111_4 and optical true delay channel group 121_4.

[0065] Among them, optical true delay channel group 121_1 includes four optical true delay channels 1211_1, antenna subarray 111_1 includes four antenna elements 1111_1, optical true delay channel group 121_2 includes four optical true delay channels 1211_2, antenna subarray 111_2 includes four antenna elements 1111_2, optical true delay channel group 121_3 includes four optical true delay channels 1211_3, antenna subarray 111_3 includes four antenna elements 1111_3, optical true delay channel group 121_4 includes four optical true delay channels 1211_4, antenna subarray 111_4 includes four antenna elements 1111_4.

[0066] The time delay of optical true delay channel 1211_1 is ( n- 1) d sinth 1 / c The coupled optical signal is transmitted through the optical true delay channel 1211_1 and then undergoes photoelectric conversion to obtain the directional millimeter-wave signal DMVS1. The phase difference of antenna element 1111_1 when transmitting the directional millimeter-wave signal DMVS1 is: exp [ -i 2 pfd ( n -1) sinth 1 / c ],in, nThis is the index number of antenna element 1111_1 in antenna subarray 111_1. The time delay of optical true delay channel 1211_1 can compensate for the time delay difference of different antenna elements 1111_1 when transmitting directional millimeter-wave signal DMVS1, so that the millimeter-wave signal MVS is in the user direction. i 1. Achieve in-phase enhancement to realize millimeter-wave signal MVS in the user direction. i Beam focusing on 1.

[0067] The time delay of optical true delay channel 1211_2 is ( n- 1) d sinth 2 / c The coupled optical signal is transmitted through the optical true delay channel 1211_2 and then undergoes photoelectric conversion to obtain the directional millimeter-wave signal DMVS2. The phase difference of antenna element 1111_2 when transmitting the directional millimeter-wave signal DMVS2 is: exp [ -i 2 pfd ( n -1) sinth 2 / c ],in, n This is the index number of antenna element 1111_2 in antenna subarray 111_2. The time delay of optical true delay channel 1211_2 can compensate for the time delay difference of different antenna elements 1111_2 when transmitting directional millimeter-wave signal DMVS2, so that the millimeter-wave signal MVS is in the user direction. i 2. In-phase enhancement is achieved on the upper part, enabling millimeter-wave signal MVS in the user direction. i Beam focusing on 2.

[0068] The delay of optical true delay channel 1211_3 is ( n- 1) d sinth 3 / c The coupled optical signal is transmitted through the optical true delay channel 1211_3 and then undergoes photoelectric conversion to obtain the directional millimeter-wave signal DMVS3. The phase difference of antenna element 1111_3 when transmitting the directional millimeter-wave signal DMVS3 is: exp [ -i 2 pfd ( n -1) sinth 3 / c ],in, nThis is the index number of antenna element 1111_3 in antenna subarray 111_3. The time delay of optical true delay channel 1211_3 can compensate for the time delay difference of different antenna elements 1111_3 when transmitting directional millimeter-wave signal DMVS3, so that the millimeter-wave signal MVS is in the user direction. i 3. In-phase enhancement is achieved on the upper part, enabling millimeter-wave signal MVS in the user direction. i Beam focusing on 3.

[0069] The delay of optical true delay channel 1211_4 is ( n- 1) d sinth 4 / c The coupled optical signal is transmitted through the optical true delay channel 1211_4 and then undergoes photoelectric conversion to obtain the directional millimeter-wave signal DMVS4. The phase difference of antenna element 1111_4 when transmitting the directional millimeter-wave signal DMVS4 is: exp [ -i 2 pfd ( n -1) sinth 4 / c ],in, n This is the index number of antenna element 1111_4 in antenna subarray 111_4. The time delay of optical true delay channel 1211_4 can compensate for the time delay difference of different antenna elements 1111_4 when transmitting directional millimeter-wave signal DMVS4, so that the millimeter-wave signal MVS is in the user direction. i 4. In-phase enhancement is achieved on the upper part, enabling millimeter-wave signal MVS in the user direction. i Beam focusing on 4.

[0070] In this way, the optical true delay network 120 can apply the time delay of each optical true delay channel 1211 in the corresponding optical true delay channel group 121 to the corresponding coupled optical signal for each user, so as to obtain the time delay modulated optical signal, to compensate for the time delay difference of different antenna elements 1111 in the corresponding antenna subarray 111 when transmitting signals, and realize the beam focusing of the millimeter wave signal MVS in the direction of the corresponding user.

[0071] For example, Figure 3 This is a schematic diagram of the structure of a receiving end provided in an embodiment of the present disclosure, such as... Figure 3As shown, the receiver 200 includes multiple receiving antennas 210 and multiple modulation channels 220. Each receiving antenna 210 corresponds to one of multiple antenna array elements, and each modulation channel 220 corresponds to one of multiple millimeter-wave signal (MVS). Each modulation channel 220 includes a mixer 221, an electro-optic intensity modulator 222, and an optical bandpass filter (OBPF). The mixer 221 is connected between the corresponding receiving antenna 210 and the electro-optic intensity modulator 222; for example, the electro-optic intensity modulator 222 can be a Mach-Zehnder intensity modulator. The optical bandpass filter (OBPF) is connected between the optical fiber network 230 and the electro-optic intensity modulator 222.

[0072] The first input of mixer 221 is connected to the corresponding receiving antenna 210 to receive a millimeter-wave signal MVS. The second input of mixer 221 receives a frequency of... f LO The mixer 221 can mix the millimeter-wave signal MVS and the local oscillator signal to obtain an intermediate frequency signal carrying the transmission information, and the frequency of the intermediate frequency signal is... f IF = f s -f LO .

[0073] Electro-optic intensity modulator 222 can modulate an intermediate frequency signal onto an optical carrier, which is generated by laser ECL3 and has a frequency of f c - f IF An optical carrier signal OCMS is obtained, and an optical bandpass filter OBPF filters out out-of-band noise from the optical carrier signal OCMS.

[0074] See also Figure 3 The receiver 200 also includes an optical fiber network 230, which is composed of multiple single-mode fiber SMFs and corresponds one-to-one with multiple optical carrier signals OCMS. Each filtered optical carrier signal OCMS is transmitted over a long distance through a single-mode fiber SMF.

[0075] The receiver 200 also includes multiple receiving channels 240, each corresponding one-to-one with a multiple optical carrier signal OCMS, for example, such as Figure 3 As shown, each receiving channel 240 includes an integrated coherent receiver ICR, a first analog-to-digital converter ADC1, and a second analog-to-digital converter ADC2.

[0076] The integrated coherent receiver (ICR) can receive the filtered optical carrier signal OCMS and the frequency emitted by the laser ECL4. f cThe local oscillating optical signal is used to perform coherent detection on the optical carrier signal OCMS based on the local oscillating optical signal. The first analog-to-digital converter ADC1 and the second analog-to-digital converter ADC2 can perform analog-to-digital conversion on the analog in-phase component and analog quadrature component of the coherent detection signal, respectively, to obtain the digital carrier signal DCMS.

[0077] For example, see [link to example]. Figure 3 The receiver 200 includes a second digital signal processor DSP2, which includes multiple carrier channels. The number of carrier channels of the second digital signal processor DSP2 is equal to the number of subcarrier modules of the first digital signal processor DSP1.

[0078] First, each of the multiple carrier channels receives a digital carrier signal (DCMS) and performs down-conversion, low-pass filtering, and clock recovery processing on the DCMS. The multiple carrier channels can be divided into Class I and Class II carrier channels. The DCMS received by the Class I carrier channels is a single-carrier signal (SCMS), while the DCMS received by the Class II carrier channels is an OFDM signal.

[0079] Then, each Type I carrier channel performs algorithms such as channel equalization and carrier phase recovery on the received single-carrier signal (SCMS) to demodulate the SCMS and obtain the transmission information carried by the single-carrier signal. Simultaneously, each Type II carrier channel performs algorithms such as CP removal, serial-to-parallel conversion, Fast Fourier Transform (FFT), pilot extraction, carrier phase recovery, and channel equalization on the received OFDM signal to demodulate the OFDM signal and obtain the transmission information carried by the OFDM signal.

[0080] Finally, the final bit error rate is calculated for each carrier channel.

[0081] For example, in the aforementioned system that supports four-user directional communication, such as Figure 3 As shown, the receiver 200 includes four modulation channels 220, namely modulation channel 1, modulation channel 2, modulation channel 3 and modulation channel 4; correspondingly, the optical fiber network 230 includes four single-mode optical fibers (SMFs), namely SMF1, SMF2, SMF3 and SMF4.

[0082] The receiver 200 also includes four receiving channels 240, namely receiving channel 1, receiving channel 2, receiving channel 3 and receiving channel 4. The second digital signal processor DSP2 includes four carrier channels, namely carrier channel 1, carrier channel 2, carrier channel 3 and carrier channel 4.

[0083] Based on the above embodiment, modulation channel 1 receives millimeter-wave signal MVS1 and modulates it into optical carrier signal OCMS1. Single-mode fiber SMF1 transmits optical carrier signal OCMS1 to receiving channel 1. Receiving channel 1 processes optical carrier signal OCMS1 to obtain digital carrier signal DCMS1. Carrier channel 1 performs down-conversion, low-pass filtering, clock recovery, channel equalization, and carrier phase recovery processing on digital carrier signal DCMS1 to obtain the transmission information carried by digital carrier signal DCMS1, i.e., the user direction information. i Sending information on 1.

[0084] Modulation channel 2 receives the millimeter-wave signal MVS2 and modulates it into an optical carrier signal OCMS2. Single-mode fiber SMF2 transmits the optical carrier signal OCMS2 to receiving channel 2. Receiving channel 2 processes the optical carrier signal OCMS2 to obtain the digital carrier signal DCMS2. Carrier channel 2 then performs down-conversion, low-pass filtering, clock recovery, channel equalization, and carrier phase recovery processing on the digital carrier signal DCMS2 to obtain the transmission information carried by the digital carrier signal DCMS2, i.e., the user direction information. i Sending information on 2.

[0085] Modulation channel 3 receives the millimeter-wave signal MVS3 and modulates it into an optical carrier signal OCMS3. Single-mode fiber SMF3 transmits the optical carrier signal OCMS3 to receiving channel 3. Receiving channel 3 processes the optical carrier signal OCMS3 to obtain the digital carrier signal DCMS3. Carrier channel 3 then performs down-conversion, low-pass filtering, clock recovery, CP removal, serial-to-parallel conversion, FFT, pilot extraction, carrier phase recovery, and channel equalization on the digital carrier signal DCMS3 to obtain the transmission information carried by the digital carrier signal DCMS3, i.e., the user direction information. i Sending information on 3.

[0086] Modulation channel 4 receives the millimeter-wave signal MVS4 and modulates it into an optical carrier signal OCMS4. Single-mode fiber SMF4 transmits the optical carrier signal OCMS4 to receiving channel 4. Receiving channel 4 processes the optical carrier signal OCMS4 to obtain the digital carrier signal DCMS4. Carrier channel 4 then performs down-conversion, low-pass filtering, clock recovery, CP removal, serial-to-parallel conversion, FFT, pilot extraction, carrier phase recovery, and channel equalization on the digital carrier signal DCMS4 to obtain the transmission information carried by the digital carrier signal DCMS4, i.e., the user direction information. i Sending information on 4.

[0087] Thus, the second digital signal processor DSP2 can perform down-conversion, low-pass filtering, clock recovery, and carrier demodulation on each of the multiple digital carrier signals DCMS to obtain the transmission information carried by each digital carrier signal DCMS, that is, to obtain the transmission information in different user directions.

[0088] This disclosure employs optical true delay beamforming technology. By introducing a precisely adjustable time delay into the optical true delay channel corresponding to each antenna element, accurate time delay compensation can be applied to different frequency components to achieve beam focusing of millimeter-wave signals in different user directions, reduce beam direction offset, and ensure that the beam pointing is consistent throughout the entire frequency band, thereby guaranteeing stable directional transmission across the entire bandwidth and improving the communication quality for multiple users.

[0089] In some embodiments, an amplifier EA can be provided between the first digital-to-analog converter DAC1 and the optical IQ modulator 131 and between the second digital-to-analog converter DAC2 and the optical IQ modulator 131 to amplify the analog in-phase component I' and the analog quadrature component Q' of the DSCM signal.

[0090] In some embodiments, an optical amplifier EDFA can be provided between the first input terminal of the optical IQ modulator 131 and the optical coupler 132 to amplify the photonic carrier multiplexed signal.

[0091] In some embodiments, a low-noise amplifier (LNA) may be provided between the first input of each mixer 221 and the output of the corresponding receiving antenna.

[0092] In some embodiments, an optical amplifier EDFA may be provided between each electro-optic intensity modulator 222 and the corresponding single-mode fiber SMF.

[0093] In some embodiments, a variable optical attenuator (VOA) can be provided between each single-mode fiber (SMF) and its corresponding integrated coherent receiver (ICR).

[0094] This disclosure also provides a communication method applicable to the optically controlled millimeter-wave phased array communication system provided in any of the above embodiments.

[0095] Figure 4 This is a flowchart illustrating a communication method provided in an embodiment of the present disclosure, such as... Figure 4 As shown, the specific steps of the communication method include: S101, the transmitting end generates multiple single-carrier signals and multiple OFDM signals carrying the transmission information.

[0096] S102, the transmitting end performs frequency division multiplexing on multiple carrier signals to obtain a DSCM signal.

[0097] S103, the transmitting end modulates the DSCM signal into a coupled optical signal.

[0098] S104, the transmitting end transmits the coupled optical signal based on the optical true delay network to obtain multiple optical signals with time delay differences.

[0099] S105, the transmitting end converts multiple optical signals with time delay differences into multiple directional millimeter wave signals with beam directionality in different user directions.

[0100] S106, the receiver receives multiple millimeter-wave signals and modulates the multiple millimeter-wave signals into multiple optical carrier signals.

[0101] S107, the receiver demodulates multiple optical carrier signals into multiple digital carrier signals.

[0102] S108, the receiving end extracts the transmission information carried by each of the multiple digital carrier signals.

[0103] Among them, multiple carrier signals, multiple user directions, multiple directional millimeter wave signals, multiple optical carrier signals, and multiple digital carrier signals correspond one-to-one.

[0104] In this embodiment, the transmitting end generates multiple single-carrier signals and multiple OFDM signals carrying transmission information. The multiple carrier signals are frequency-division multiplexed to obtain a digital subcarrier multiplexed (DSCM) signal. The DSCM signal is modulated into a coupled optical signal, which is then transmitted based on an optical true delay network to obtain multiple optical signals with time delay differences. These multiple optical signals with time delay differences are converted into multiple directional millimeter-wave signals with beam directionality in different user directions and transmitted to the receiving end. The receiving end receives the multiple millimeter-wave signals, modulates them into multiple optical carrier signals, demodulates them into multiple digital carrier signals, and extracts the transmission information carried by each digital carrier signal. Accurate time delay compensation can be applied to different frequency components to achieve beam focusing of the millimeter-wave signals in different user directions, reducing beam direction offset and ensuring consistent beam directionality across the entire frequency band. This guarantees stable directional transmission across the entire bandwidth, thereby improving the communication quality for multiple users.

[0105] In some embodiments, a specific description of a possible implementation of S103 is as follows: S201 modulates the DSCM signal into an optical signal and couples it with the optical carrier used for heterodyne beat frequency to form a coupled optical signal.

[0106] S202 splits a single coupled optical signal into multiple coupled optical signals and provides the multiple coupled optical signals to the optical true delay network.

[0107] Among them, the multiple photodetectors in the multi-coupled optical signal and photodetector array correspond one-to-one with the multiple optical true delay channels in the optical true delay network.

[0108] As a specific description of one possible implementation when executing S104, the following is an example: For each user, the time delay of each optical true delay channel in the corresponding optical true delay channel group is applied to the corresponding coupled optical signal to obtain a time delay modulated optical signal.

[0109] As a specific description of one possible implementation of S105, the following is an example: Each time-delay modulated optical signal in the multi-channel time-delay modulated optical signal is photoelectrically converted to obtain multiple directional millimeter-wave signals to compensate for the time delay difference of different antenna elements in the corresponding antenna subarray when transmitting signals.

[0110] In some embodiments, the phase difference of each antenna element during signal transmission is: exp [ -i 2 pfd ( n -1) sinth m / c The corresponding delay of the optical true delay channel is ( n- 1) d sinth m / c ;in, n This represents the index number of the antenna element in the corresponding antenna subarray. d The spacing between the antenna elements. i m For the corresponding user direction, c At the speed of light, f The frequency of the millimeter-wave signal.

[0111] In some embodiments, a specific description of a possible implementation of S201 is as follows: The DSCM signal is modulated into a photonic carrier multiplexed signal, and the photonic carrier multiplexed signal is coupled with the local oscillator optical signal to obtain a coupled optical signal.

[0112] In some embodiments, a specific description of a possible implementation of S102 is as follows: Each carrier signal is upsampled, root-raised cosine filtered, and upconverted to obtain multiple digital subcarrier signals. These multiple digital subcarrier signals are then frequency-division multiplexed to obtain a DSCM signal.

[0113] In some embodiments, the plurality of digital subcarrier signals include a plurality of digital subcarrier signal pairs, wherein the center frequency of any digital subcarrier signal pair is - BW (2 x- 1 +α ) / 2 and BW (2 x- 1 +α ) / 2, where, BW The bandwidth of the DSCM signal. α The roll-off factor of the root-raised cosine filter. x This determines the order of the digital subcarrier signal pair among multiple digital subcarrier signal pairs.

[0114] In some embodiments, a specific description of a possible implementation of the step of modulating multiple millimeter-wave signals into multiple optical carrier signals is as follows: A millimeter-wave signal is mixed with a local oscillator signal to obtain an intermediate frequency signal carrying the transmission information; the intermediate frequency signal is modulated onto an optical carrier to obtain an optical carrier signal.

[0115] In some embodiments, a specific description of a possible implementation of S107 is as follows: A digital carrier signal is obtained by coherently detecting an optical carrier signal based on a local oscillating optical signal and performing analog-to-digital conversion.

[0116] In some embodiments, a specific description of a possible implementation of S108 is as follows: Each of the multiple digital carrier signals undergoes downconversion, low-pass filtering, clock recovery, and carrier demodulation to obtain the transmission signal corresponding to different user directions.

[0117] Unless otherwise expressly indicated by the context, the singular form of words used herein and in the appended claims includes the plural form, and vice versa. Thus, when referring to the singular, the plural form of the corresponding term is generally included. Similarly, the terms “comprising” and “including” shall be interpreted as including rather than exclusively. Likewise, the terms “including” and “or” shall be interpreted as including unless such interpretation is expressly prohibited herein. Where the term “example” is used herein, particularly when it follows a set of terms, the “example” is merely exemplary and illustrative and should not be considered exclusive or extensive.

[0118] Further aspects and scope of adaptation become apparent from the description provided herein. It should be understood that various aspects of this application may be implemented individually or in combination with one or more other aspects. It should also be understood that the descriptions and specific embodiments herein are for illustrative purposes only and are not intended to limit the scope of this application.

[0119] Several embodiments of this disclosure have been described in detail above. However, it is obvious that those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of this disclosure. The scope of protection of this disclosure is defined by the appended claims.

Claims

1. An optically controlled millimeter wave phased array communication system, characterized by, Comprise: The sending end is used for generating a plurality of single carrier signals and a plurality of orthogonal frequency division multiplexing (OFDM) signals carrying sending information, frequency division multiplexing the plurality of carrier signals to obtain a digital sub-carrier multiplexing (DSCM) signal, modulating the DSCM signal into a coupled optical signal, transmitting the coupled optical signal based on an optical true delay network to obtain a plurality of optical signals with time delay difference, and converting the plurality of optical signals with time delay difference into a plurality of directional millimeter wave signals with beam pointing in different user directions; The receiving end is used for receiving a plurality of millimeter wave signals, modulating the plurality of millimeter wave signals into a plurality of optical carrier signals, demodulating the plurality of optical carrier signals into a plurality of digital carrier signals, and extracting the sending information carried by each of the plurality of digital carrier signals. The sending end comprises an antenna array and an optical true delay network, and a plurality of user directions, the plurality of digital carrier signals, the plurality of optical carrier signals, a plurality of directional millimeter wave signals, the plurality of carrier signals, a plurality of optical true delay channel groups in the optical true delay network, and a plurality of antenna sub-arrays in the antenna array are in one-to-one correspondence, and a plurality of antenna elements in an antenna sub-array are in one-to-one correspondence with a plurality of optical true delay channels in an optical true delay channel group.

2. The optically controlled millimeter wave phased array communication system of claim 1, wherein, The sending end further comprises: A modulation module is used for modulating the DSCM signal into an optical signal, and coupling with an optical carrier for heterodyne frequency to form a coupled optical signal; An optical splitter network is used for splitting the coupled optical signal into a plurality of coupled optical signals, and providing the plurality of coupled optical signals to the optical true delay network; The optical true delay network is used for applying a time delay amount of each optical true delay channel in a corresponding optical true delay channel group to a corresponding coupled optical signal to obtain a time delay regulated optical signal for each user; A photodetector array is used for optoelectronic conversion of each of the plurality of time delay regulated optical signals to obtain a plurality of directional millimeter wave signals to compensate for the time delay difference of different antenna elements in a corresponding antenna sub-array when transmitting signals; wherein the plurality of coupled optical signals, the plurality of time delay regulated optical signals, a plurality of photodetectors in the photodetector array, and a plurality of optical true delay channels in the optical true delay network are in one-to-one correspondence.

3. The optically controlled millimeter wave phased array communication system of claim 2, wherein, The phase difference of each antenna array element when transmitting a signal is exp [ -i 2 πfd ( n -1) sinθ m / c ] and the time delay of the corresponding optical true delay channel is ( n- 1) d sinθ m / c ; wherein, n is the index number of the antenna array element in the corresponding antenna subarray, d is the spacing of the antenna array elements, θ m is the corresponding user direction, c is the speed of light, f is the frequency of the millimeter wave signal.

4. The optically controlled millimeter wave phased array communication system of claim 2, wherein, The modulation module comprises: An optical IQ modulator is used for modulating the DSCM signal into an optical sub-carrier multiplexing signal; An optical coupler is used for coupling the optical sub-carrier multiplexing signal with a local oscillation optical signal to obtain the coupled optical signal.

5. The optically controlled millimeter wave phased array communication system of claim 1, wherein, The sending end further comprises: A first digital signal processor is used for upsampling, root raised cosine filtering, and up-conversion processing of each carrier signal to obtain a plurality of digital sub-carrier signals, and frequency division multiplexing the plurality of digital sub-carrier signals to obtain the DSCM signal.

6. The optically controlled millimeter wave phased array communication system of claim 5, wherein, The plurality of digital subcarrier signals comprises a plurality of pairs of digital subcarrier signals, a center frequency of any pair of digital subcarrier signals being BW (2 x- 1 +α ) / 2 and BW (2 x- 1 +α ) / 2, wherein, BW is a bandwidth of the DSCM signal, α is a roll-off factor of a root raised cosine filter, x is an order of the pair of digital subcarrier signals among the plurality of pairs of digital subcarrier signals.

7. The plasmonic millimeter wave phased array communication system of claim 1, wherein, The receiving end comprises a plurality of modulation channels, and the plurality of modulation channels are in one-to-one correspondence with the plurality of directional millimeter wave signals: Each modulation channel comprises: A mixer is used for mixing a millimeter wave signal with a local oscillator signal to obtain an intermediate frequency signal carrying the sending information; An electro-optical intensity modulator is used to modulate a middle frequency signal onto an optical carrier to obtain an optical carrier signal.

8. The optically controlled millimeter wave phased array communication system of claim 1, wherein, The receiving end comprises a plurality of receiving channels corresponding to the plurality of optical carrier signals one by one. Each receiving channel is used to coherently detect an optical carrier signal based on a local oscillation optical signal and perform analog-to-digital conversion to obtain a digital carrier signal.

9. The plasmonic millimeter wave phased array communication system of claim 1, wherein, The receiving end comprises: A second digital signal processor is used to perform down-conversion, low-pass filtering, clock recovery and carrier demodulation processing on each of the plurality of digital carrier signals to obtain transmission information corresponding to different user directions.

10. A communication method characterized by comprising: The method is applied to the optical-controlled millimeter wave phased array communication system of any one of claims 1-9 and is executed by a transmitting end in the optical-controlled millimeter wave phased array communication system, and the method comprises: generating a plurality of single carrier signals and a plurality of orthogonal frequency division multiplexing (OFDM) signals carrying transmission information; processing a plurality of carrier signals to obtain digital sub-carrier multiplexing (DSCM) signals, the plurality of carrier signals corresponding to a plurality of user directions one by one; modulating the DSCM signals into coupled optical signals; transmitting the coupled optical signals based on an optical true time delay network to obtain a plurality of optical signals with time delay differences; converting the plurality of optical signals with time delay differences into a plurality of directional millimeter wave signals with beam pointing in different user directions, the plurality of directional millimeter wave signals corresponding to the plurality of user directions one by one; transmitting the plurality of directional millimeter wave signals to a receiving end to enable the receiving end to receive a plurality of millimeter wave signals, modulate the plurality of millimeter wave signals into a plurality of optical carrier signals, demodulate the plurality of optical carrier signals into a plurality of digital carrier signals, and extract the transmission information carried by each of the plurality of digital carrier signals; wherein the plurality of directional millimeter wave signals, the plurality of optical carrier signals and the plurality of digital carrier signals correspond one by one.

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