A metasurface antenna and communication method for realizing dual-stream communication

Abstract

The application discloses a metasurface antenna and a communication method for realizing double-flow communication. The metasurface antenna comprises a first feed antenna, a second feed antenna, a first RIS and a second RIS. The communication method is realized by a communication system comprising a signal generating module, a signal processing module, a first receiving antenna and a second receiving antenna. The polarization directions of the first RIS and the second RIS are orthogonal to each other. The polarization direction of the first receiving antenna is the same as that of the first RIS. The polarization direction of the second receiving antenna is the same as that of the second RIS. The signal generating module generates a first vector signal and a second vector signal. The first RIS reflects the first vector signal sent by the first feed antenna, and the second RIS reflects the second vector signal sent by the second feed antenna. The signal processing module processes the first vector signal received through the first receiving antenna and the second vector signal received through the second receiving antenna, realizes double-flow communication, and reduces the probability of beam coupling.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to a metasurface antenna and communication method for realizing dual-stream communication. Background Technology

[0002] In recent years, reconfigurable smart surfaces (RIS) have attracted considerable attention in the field of wireless communication due to their electromagnetic wave manipulation capabilities. How to achieve dual-stream communication using reconfigurable metasurface antennas has become a hot topic in this field. Large-scale MIMO array antennas in related technologies mainly employ phased array antennas; however, because each element in a phased array antenna requires a discrete phase shifter for phase shifting, the energy consumption and cost of phased arrays are very high.

[0003] In related technologies, the technical solution of realizing dual-stream transmission by utilizing the polarization characteristics of metamaterial antennas uses a dual-polarized metamaterial to reflect the signals transmitted by the two feed sources respectively, which easily leads to beam coupling problems. Summary of the Invention

[0004] The purpose of this application is to provide a metasurface antenna and communication method for realizing dual-stream communication, thereby solving the technical problem of beam coupling issues in related technologies. To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general description, nor is it intended to identify key / important components or describe the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simple form as a prelude to the detailed description that follows.

[0005] According to one aspect of the embodiments of this application, a metasurface antenna for realizing dual-stream communication is provided. The metasurface antenna includes a first feed antenna, a second feed antenna, a first RIS, and a second RIS. The first feed antenna is used to transmit the first vector signal, and the second feed antenna is used to transmit the second vector signal. The first RIS is used to reflect the first vector signal, and the second RIS is used to reflect the second vector signal.

[0006] According to one aspect of the embodiments of this application, a dual-stream communication system with RIS is provided, including a signal generation module, a signal processing module, a first feed antenna, a second feed antenna, a first RIS, a second RIS, a first receiving antenna, and a second receiving antenna;

[0007] The polarization directions of the first RIS and the second RIS are orthogonal to each other; the polarization direction of the first receiving antenna is the same as that of the first RIS; the polarization direction of the second receiving antenna is the same as that of the second RIS.

[0008] The signal generation module is used to generate a first vector signal and a second vector signal;

[0009] The first feed antenna is used to transmit the first vector signal, and the second feed antenna is used to transmit the second vector signal;

[0010] The first RIS is used to reflect the first vector signal, and the second RIS is used to reflect the second vector signal;

[0011] The first receiving antenna is used to receive the first vector signal reflected by the first RIS, and the second receiving antenna is used to receive the second vector signal reflected by the second RIS;

[0012] The signal processing module is used to process the first vector signal and the second vector signal.

[0013] In some embodiments of this application, the signal processing module includes a first low-noise amplifier, a first spectrum analyzer, a second low-noise amplifier, and a second spectrum analyzer.

[0014] The first low-noise amplifier is used to amplify the first vector signal;

[0015] The first spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the first low-noise amplifier;

[0016] The second low-noise amplifier is used to amplify the second vector signal;

[0017] The second spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the second low-noise amplifier.

[0018] In some embodiments of this application, the dual-stream communication system with RIS further includes a control device for controlling the signal generation module, the first feed antenna, the second feed antenna, the first RIS, and the second RIS.

[0019] In some embodiments of this application, the control device includes a data processor and a first controller and a second controller respectively connected to the data processor; the first RIS is connected to the first controller; and the second RIS is connected to the second controller.

[0020] According to another aspect of the embodiments of this application, a dual-stream communication method is provided, applied to a transmitting device, the transmitting device including a signal generating module, a first feed antenna, a second feed antenna, a first RIS and a second RIS; the method includes:

[0021] The transmitting device estimates the directions of the first receiving antenna and the second receiving antenna;

[0022] The transmitting device is configured with the states of the first RIS and the second RIS.

[0023] In the radiation pattern of the first RIS, the main lobe direction is aligned with the first receiving antenna, and in the radiation pattern of the second RIS, the main lobe direction is aligned with the second receiving antenna.

[0024] The signal generation module generates a first vector signal and a second vector signal;

[0025] The first feed antenna transmits a first vector signal into free space, and the second feed antenna transmits a second vector signal into free space;

[0026] The first vector signal is incident on the first RIS, and the second vector signal is incident on the second RIS;

[0027] The first RIS reflects the first vector signal, and the second RIS reflects the second vector signal;

[0028] The polarization directions of the first RIS and the second RIS are orthogonal to each other; the polarization direction of the first receiving antenna is the same as that of the first RIS; the polarization direction of the second receiving antenna is the same as that of the second RIS.

[0029] According to another aspect of the embodiments of this application, a dual-stream communication method is provided, applied to a receiving device, the receiving device including a signal processing module and a first receiving antenna and a second receiving antenna respectively connected to the signal processing module; the method includes:

[0030] The first receiving antenna receives the first vector signal, and the second receiving antenna receives the second vector signal;

[0031] The signal processing module processes the first vector signal and the second vector signal;

[0032] The first vector signal and the second vector signal are generated by the signal generating module. The first vector signal is transmitted by the first feed antenna and reflected by the first RIS, and the second vector signal is transmitted by the second feed antenna and reflected by the second RIS. The polarization directions of the first RIS and the second RIS are orthogonal to each other. The polarization direction of the first receiving antenna is the same as that of the first RIS. The polarization direction of the second receiving antenna is the same as that of the second RIS.

[0033] In some embodiments of this application, the signal processing module includes a first low-noise amplifier, a first spectrum analyzer, a second low-noise amplifier, and a second spectrum analyzer.

[0034] The signal processing module processes the first vector signal and the second vector signal, including:

[0035] The first low-noise amplifier is used to amplify the first vector signal;

[0036] The first spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the first low-noise amplifier;

[0037] The second low-noise amplifier is used to amplify the second vector signal;

[0038] The second spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the second low-noise amplifier.

[0039] According to another aspect of the embodiments of this application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the dual-stream communication method described in any of the preceding claims.

[0040] According to another aspect of the embodiments of this application, a computer-readable storage medium is provided having a computer program stored thereon, which is executed by a processor to implement the dual-stream communication method described in any of the preceding claims.

[0041] According to another aspect of the embodiments of this application, a transmission method is provided, comprising:

[0042] The sender estimates the receiver's orientation;

[0043] The sender configures the states of the two RIS so that the main lobe directions of the two RIS are aligned with their respective receivers in the directional diagrams.

[0044] The transmitter feeds two data streams into two RIS arrays respectively. The signal is first radiated into free space by the feed source of the RIS array, then incident on the RIS array, and after reflection and phase shifting by each RIS unit, it finally forms a specific reflected beam pointing to its respective receiver.

[0045] The receiver uses an antenna to receive useful signals and extracts data from the received signals.

[0046] One aspect of the technical solution provided in this application embodiment may include the following beneficial effects:

[0047] The dual-stream communication system with RIS provided in this application includes a signal generation module, a signal processing module, a first feed antenna, a second feed antenna, a first RIS, a second RIS, a first receiving antenna, and a second receiving antenna. The polarization directions of the first RIS and the second RIS are orthogonal to each other. The polarization directions of the first receiving antenna and the first RIS are the same, and the polarization directions of the second receiving antenna and the second RIS are the same. The signal generation module is used to generate a first vector signal and a second vector signal. The first feed antenna is used to transmit the first vector signal, and the second feed antenna is used to transmit the second vector signal. The first RIS is used to reflect the first vector signal, and the second RIS is used to reflect the second vector signal. The first receiving antenna is used to receive the first vector signal reflected by the first RIS, and the second receiving antenna is used to receive the second vector signal reflected by the second RIS. The signal processing module is used to process the first vector signal and the second vector signal. This system realizes dual-stream communication, greatly reduces the probability of beam coupling, and overcomes the technical defects of beam coupling problems in related technologies.

[0048] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing embodiments of this application. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 A block diagram of a dual-stream communication system with RIS according to an embodiment of this application is shown.

[0051] Figure 2 A block diagram of a two-stream communication system architecture with RIS, representing a specific example of this application, is shown.

[0052] Figure 3 A schematic diagram of the communication connection between the feed antenna, the RIS, and the receiving antenna is shown in one embodiment of this application.

[0053] Figure 4 A flowchart of a specific example of a two-stream communication method of this application is shown.

[0054] Figure 5 A diagram showing the results of a verification test of the RX antenna 1 is presented.

[0055] Figure 6 Another verification test result diagram of RX antenna 1 is shown.

[0056] Figure 7 A diagram showing the results of a verification test of the RX antenna 2 is displayed.

[0057] Figure 8 Another verification test result diagram of RX antenna 2 is shown.

[0058] Figure 9 A block diagram of an electronic device according to another embodiment of this application is shown.

[0059] Figure 10 A schematic diagram of a computer-readable storage medium according to another embodiment of this application is shown.

[0060] The purpose, functional features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0062] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0063] In related technologies, solutions for metamaterial antennas utilize the phase-shifting properties of metamaterials to achieve analog beamforming, and combine this with digital beamforming to realize multi-stream transmission via space division multiple access. However, none of these solutions utilize the polarization characteristics of metamaterial antennas. Utilizing these polarization characteristics could achieve better dual-stream transmission performance, especially when two users are very close together or even when a user has integrated two antennas.

[0064] One embodiment of this application provides a metasurface antenna for realizing dual-stream communication. The metasurface antenna includes a first feed antenna, a second feed antenna, a first RIS, and a second RIS. The first feed antenna is used to transmit the first vector signal, and the second feed antenna is used to transmit the second vector signal. The first RIS is used to reflect the first vector signal, and the second RIS is used to reflect the second vector signal. This metasurface antenna can be used to realize dual-stream communication, reducing the probability of beam coupling.

[0065] refer to Figure 1 As shown, one embodiment of this application provides a dual-stream communication system with RIS, including a transmitting device and a receiving device; the transmitting device includes a signal generating module, a first feed antenna, a second feed antenna, a first RIS, and a second RIS; the first feed antenna and the second feed antenna are respectively connected to the signal generating module; the receiving device includes a signal processing module and a first receiving antenna and a second receiving antenna respectively connected to the signal processing module.

[0066] The polarization directions of the first RIS and the second RIS are orthogonal to each other; the polarization direction of the first receiving antenna is the same as that of the first RIS; the polarization direction of the second receiving antenna is the same as that of the second RIS; since the polarization directions of the first RIS and the second RIS are orthogonal to each other, the polarization directions of the first receiving antenna and the second receiving antenna are also orthogonal to each other; the signal generation module is used to generate a first vector signal and a second vector signal, and sends the first vector signal to the first feed antenna and the second vector signal to the second feed antenna; the first feed antenna is used to transmit the first vector signal, and the second feed antenna is used to transmit the second vector signal; the first RIS is used to receive and reflect the first vector signal transmitted by the first feed antenna, and the second RIS is used to receive and reflect the second vector signal transmitted by the second feed antenna; the first receiving antenna is used to receive the first vector signal reflected by the first RIS, and the second receiving antenna is used to receive the second vector signal reflected by the second RIS; the signal processing module is used to process the first vector signal transmitted by the first receiving antenna and the second vector signal transmitted by the second receiving antenna.

[0067] Antennas based on RIS (Reconfigurable Smart Surfaces) reflect electromagnetic waves with two orthogonal polarization directions. Each electromagnetic wave carries a data stream, and the user receives both data streams, achieving two-stream communication and thus solving the technical defect of beam coupling problems. The transmitting device is equipped with two linearly polarized RIS with mutually perpendicular polarization directions. Each RIS is used to transmit an independent data stream. The receiving device for each data stream (or possibly one receiving device with two data streams) is equipped with a linearly polarized antenna with the same polarization direction as the corresponding RIS. The receiver for each data stream (or possibly one receiver with two data streams) is also equipped with a linearly polarized antenna with the same polarization direction as the corresponding RIS.

[0068] In one embodiment, the signal processing module includes a first low-noise amplifier, a first spectrum analyzer, a second low-noise amplifier, and a second spectrum analyzer.

[0069] The first low-noise amplifier is used to amplify the first vector signal;

[0070] The first spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the first low-noise amplifier;

[0071] The second low-noise amplifier is used to amplify the second vector signal;

[0072] The second spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the second low-noise amplifier.

[0073] In one embodiment, the dual-stream communication system with RIS further includes a control device for controlling the signal generation module, the first feed antenna, the second feed antenna, the first RIS, and the second RIS.

[0074] In one embodiment, the control device includes a data processor and a first controller and a second controller respectively connected to the data processor; the first RIS is connected to the first controller; and the second RIS is connected to the second controller.

[0075] refer to Figure 2As shown, in a specific example, the data processor is connected to a vector signal generator SMW200A, which is connected to a first feed antenna and a second feed antenna. A first RISRIS1 reflects electromagnetic waves from the first feed antenna, and a second RISRIS2 reflects electromagnetic waves from the second feed antenna. The data processor is connected to the first RISRIS1 via a first controller and to the second RISRIS2 via a second controller. A first receiving antenna Rx antenna 1, a first low-noise amplifier, and a first spectrum analyzer are connected in sequence. A second receiving antenna Rx antenna 2, a second low-noise amplifier, and a second spectrum analyzer are connected in sequence. The first receiving antenna Rx antenna 1 receives the electromagnetic wave signal reflected by the first RISRIS1. The second receiving antenna Rx antenna 2 receives the electromagnetic wave signal reflected by the second RISRIS2. Figure 3 A schematic diagram of the communication connection between the feed antenna, RIS, and receiving antenna is shown. The first feed antenna Feed1 transmits a first vector signal, which RIS1 receives and reflects. The first receiving antenna Rx1 receives the first vector signal reflected by RIS1. The second feed antenna Feed2 transmits a second vector signal, which RIS2 receives and reflects. The second receiving antenna Rx2 receives the second vector signal reflected by RIS2.

[0076] Compared to phased array antennas, reconfigurable metasurfaces (RIS) only require diodes to achieve phase shifting, eliminating the need for traditional phase shifters. Therefore, RIS can significantly reduce costs and power consumption compared to traditional phased arrays. RIS has advantages in terms of low power consumption and low cost.

[0077] The dual-stream communication system with RIS in this application embodiment can realize dual-stream communication, greatly reducing the probability of beam coupling, thereby overcoming the technical defects of beam coupling problems in related technologies, and solving the technical problem of beam coupling problems caused by using the polarization characteristics of metamaterial antennas to realize dual-stream transmission and using a dual-polarized metamaterial to reflect the signals transmitted by two feed sources respectively.

[0078] One embodiment of this application provides a dual-stream communication method applied to a transmitting device, the transmitting device including a signal generating module, a first feed antenna, a second feed antenna, a first RIS, and a second RIS; the method includes:

[0079] The transmitting device estimates the directions of the first receiving antenna and the second receiving antenna;

[0080] The transmitting device is configured with the states of the first RIS and the second RIS.

[0081] In the radiation pattern of the first RIS, the main lobe direction is aligned with the first receiving antenna, and in the radiation pattern of the second RIS, the main lobe direction is aligned with the second receiving antenna.

[0082] The signal generation module generates a first vector signal and a second vector signal;

[0083] The first feed antenna transmits a first vector signal into free space, and the second feed antenna transmits a second vector signal into free space;

[0084] The first vector signal is incident on the first RIS, and the second vector signal is incident on the second RIS;

[0085] The first RIS reflects the first vector signal, and the second RIS reflects the second vector signal;

[0086] The polarization directions of the first RIS and the second RIS are orthogonal to each other; the polarization direction of the first receiving antenna is the same as that of the first RIS; the polarization direction of the second receiving antenna is the same as that of the second RIS.

[0087] Another embodiment of this application provides a dual-stream communication method applied to a transmitting device, the transmitting device including a signal generating module, a first feed antenna, a second feed antenna, a first RIS, and a second RIS; the method includes:

[0088] The signal generation module generates a first vector signal and a second vector signal;

[0089] The first feed antenna transmits a first vector signal, and the second feed antenna transmits a second vector signal;

[0090] The first RIS receives and reflects the first vector signal transmitted by the first feed antenna, and the second RIS receives and reflects the second vector signal transmitted by the second feed antenna; the polarization directions of the first RIS and the second RIS are orthogonal to each other; the polarization direction of the first receiving antenna is the same as that of the first RIS; the polarization direction of the second receiving antenna is the same as that of the second RIS; the polarization directions of the first receiving antenna and the second receiving antenna are orthogonal to each other.

[0091] The first vector signal is received by the first receiving antenna and then transmitted to the signal processing module for processing, and the second vector signal is received by the second receiving antenna and then transmitted to the signal processing module for processing.

[0092] In one embodiment, a first feed antenna transmits a first vector signal to a first RIS in the form of an incident electromagnetic wave; a second feed antenna transmits a second vector signal to a second RIS in the form of an incident electromagnetic wave.

[0093] One embodiment of this application provides a dual-stream communication method applied to a receiving device, the receiving device including a signal processing module and a first receiving antenna and a second receiving antenna respectively connected to the signal processing module; the method includes:

[0094] The first receiving antenna receives the first vector signal, and the second receiving antenna receives the second vector signal;

[0095] The signal processing module processes the first vector signal and the second vector signal;

[0096] The first vector signal and the second vector signal are generated by the signal generation module. The first vector signal is transmitted by the first feed antenna and reflected by the first RIS, and the second vector signal is transmitted by the second feed antenna and reflected by the second RIS. The polarization directions of the first RIS and the second RIS are orthogonal to each other. The polarization directions of the first receiving antenna and the first RIS are the same, and the polarization directions of the second receiving antenna and the second RIS are the same. The polarization directions of the first receiving antenna and the second receiving antenna are orthogonal to each other.

[0097] In one embodiment, the signal processing module includes a first low-noise amplifier, a first spectrum analyzer, a second low-noise amplifier, and a second spectrum analyzer.

[0098] The signal processing module processes the first vector signal and the second vector signal, including:

[0099] The first low-noise amplifier is used to amplify the first vector signal;

[0100] The first spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the first low-noise amplifier;

[0101] The second low-noise amplifier is used to amplify the second vector signal;

[0102] The second spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the second low-noise amplifier.

[0103] refer to Figure 4 As shown, in a specific example, the two-stream communication method may include the following steps:

[0104] 1) The transmitting device estimates the direction of the receiving device.

[0105] 2) Configure the transmitting device to be in the state of two RIS, so that the main lobe direction of the two RIS is aligned with their respective receiving devices in the directional diagram.

[0106] 3) The transmitting device feeds the two data streams into two RIS respectively.

[0107] Specifically, the signal is first radiated into free space by the feed of the RIS, then incident on the RIS array, and after reflection and phase shifting by each RIS unit, it finally forms a specific reflected beam that points to its respective receiving device.

[0108] 4) The receiving device uses a receiving antenna to receive useful signals and utilizes the polarization characteristics of the receiving antenna and the high directivity of the transmitting beam to minimize interference signals, thereby successfully extracting data from the received signals.

[0109] Another embodiment of this application provides a transmission method, including:

[0110] The sender estimates the receiver's orientation;

[0111] The sender configures the states of the two RIS so that the main lobe directions of the two RIS are aligned with their respective receivers in the directional diagrams.

[0112] The transmitter feeds two data streams into two RIS arrays respectively. The signal is first radiated into free space by the feed source of the RIS array, then incident on the RIS array, and after reflection and phase shifting by each RIS unit, it finally forms a specific reflected beam pointing to its respective receiver.

[0113] The receiver uses an antenna to receive useful signals and extracts data from the received signals.

[0114] The dual-stream communication method of this application realizes dual-stream communication, greatly reducing the probability of beam coupling, thereby overcoming the technical defects of beam coupling problems in related technologies, and solving the technical problem of beam coupling problems caused by using the polarization characteristics of metamaterial antennas to realize dual-stream transmission and using a dual-polarized metamaterial to reflect the signals transmitted by two feed sources respectively.

[0115] In related technologies, single-board RIS reflect two streams of signals separately, which can lead to signal coupling. Changing the beam of one stream will also change the beam of the other stream, posing a challenge to beamforming. This invention uses a dual-board electromagnetic wave reflection system, which avoids coupling and significantly reduces the difficulty of beamforming.

[0116] In a specific example, the transmitting device includes a transmitter consisting of a vector signal generator (SMW200A) and two linearly polarized RIS-based antennas (RIS 1 and RIS 2) for signal generation, outputting two data streams. RIS 1 and RIS 2 are metasurface antennas capable of enabling dual-stream communication. The receiving device includes a receiver, a first spectrum analyzer, a second spectrum analyzer, a first low-noise amplifier, and a second low-noise amplifier. RX antenna 1 receives the signal from RIS 1, and RX antenna 2 receives the signal from RIS 2. The first low-noise amplifier is connected to RX antenna 1, the first spectrum analyzer is connected to the first low-noise amplifier, the second low-noise amplifier is connected to RX antenna 2, and the second spectrum analyzer is connected to the second low-noise amplifier. The receiver consists of two horn antennas (RX antenna 1 and RX antenna 2). The spectrum analyzer (FSW) is used to measure ACLR and EVM. The low-noise amplifier is used to reduce noise to improve the output signal-to-noise ratio.

[0117] Performance metrics:

[0118] 1) Adjacent Channel Leakage Ratio (ACLR): The ratio of power in a specified channel to power in adjacent channels. Its physical meaning is to measure the interference to adjacent channels. It reflects how much of a signal is leaked into the adjacent channel. The requirement is: <-30dBc.

[0119] ACLR (Adjacent Channel Leakage Ratio) is a metric used to measure the amount of RF energy transmitted outside of the specified transmission channels. It is generated by the output power amplifier and must be measured accurately because it can cause interference and violate the specified requirements.

[0120] 2) Error Vector Magnitude (EVM): The vector difference between the ideal error-free reference signal and the actual transmitted signal at a given moment. It comprehensively measures the amplitude and phase errors of the modulated signal. Physical meaning: The distance between the reference signal and the actual transmitted signal. This embodiment uses 64QAM, and the specification is less than 8%. Specifically, the specification for QPSK is 17.5%, for 16QAM it is 12.5%, for 64QAM it is 8%, and for 256QAM it is 3.5%.

[0121] In a specific example, the workflow of the above-described dual-stream communication system with RIS includes:

[0122] 1) The feed horns (Feed 1 and Feed 2) located above the metasurface array are connected to the vector signal generator and send the incident electromagnetic wave containing the signal to be transmitted to the RIS (RIS 1 and RIS 2).

[0123] 2) Each unit on the array reflects the incident wave and applies corresponding amplitude and phase changes. The unit state corresponding to different targets pointing to the beam is calculated based on the phase modulation theory of electromagnetic wave fronts.

[0124] 3) By communicating with the host computer and the control circuit, the output of the control circuit is changed, and different bias voltages are applied to each unit to complete the metasurface array configuration. The reflected waves of each unit can then be superimposed in a given direction to achieve beamforming.

[0125] 4) The two beams are received by the user (RX antenna 1 and RX antenna 2), passed through a low-noise amplifier, and ACLR and EVM are measured with a spectrum analyzer.

[0126] refer to Figures 5 to 8 As shown, the test results data of the dual-stream communication system with RIS in this embodiment include: RX antenna 1 (ACLR = -33.59dBc, EVM = 3.04%); RX antenna 2 (ACLR = -29.66dBc, EVM = 3.80%).

[0127] Therefore, it can be seen that linearly polarized RIS with two polarization directions perpendicular to each other meets the requirements of EVM and ACLR and can support dual-stream communication.

[0128] Another embodiment of this application provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the dual-stream communication method described in any of the above embodiments.

[0129] refer to Figure 9 As shown, the electronic device 10 may include: a processor 100, a memory 101, a bus 102 and a communication interface 103. The processor 100, the communication interface 103 and the memory 101 are connected through the bus 102. The memory 101 stores a computer program that can run on the processor 100. When the processor 100 runs the computer program, it executes the method provided in any of the foregoing embodiments of this application.

[0130] The memory 101 may include high-speed random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 103 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc.

[0131] Bus 102 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. Memory 101 is used to store programs. After receiving an execution instruction, processor 100 executes the program. The methods disclosed in any of the foregoing embodiments of this application can be applied to processor 100, or implemented by processor 100.

[0132] Processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 100 or by instructions in software form. The processor 100 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it may also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), an Off-the-shelf Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 101. The processor 100 reads the information in memory 101 and, in conjunction with its hardware, completes the steps of the above method.

[0133] The electronic device and the method provided in this application embodiment are based on the same inventive concept and have the same beneficial effects as the methods used, operated or implemented. They realize dual-stream communication, greatly reduce the probability of beam coupling, and thus overcome the technical defects of beam coupling problems in related technologies. They also solve the technical problem in related technologies that uses the polarization characteristics of metamaterial antennas to achieve dual-stream transmission and uses a dual-polarized metamaterial to reflect the signals transmitted by the two feed sources respectively, which leads to beam coupling problems.

[0134] This application also provides a computer-readable storage medium corresponding to the method provided in the foregoing embodiments, having stored thereon a computer program that is executed by a processor to implement the dual-stream communication method of any of the above embodiments. (Reference) Figure 10 As shown, the computer-readable storage medium is an optical disc 20, on which a computer program (i.e., a program product) is stored. When the computer program is run by a processor, it executes the methods provided in any of the aforementioned embodiments.

[0135] It should be noted that examples of computer-readable storage media may also include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media, which will not be elaborated here.

[0136] The computer-readable storage medium provided in the above embodiments of this application and the method provided in the embodiments of this application are based on the same inventive concept and have the same beneficial effects as the methods adopted, run or implemented by the application stored therein. They realize dual-stream communication, greatly reduce the probability of beam coupling, and thus overcome the technical defects of beam coupling problems in related technologies. They also solve the technical problem in related technologies that uses the polarization characteristics of metamaterial antennas to realize dual-stream transmission and uses a dual-polarized metamaterial to reflect the signals transmitted by the two feed sources respectively, which leads to beam coupling problems.

[0137] It should be noted that:

[0138] The algorithms and displays provided herein are not inherently related to any particular computer, virtual device, or other equipment. Various general-purpose devices can also be used with the examples based on this. The required structure for constructing such devices is obvious from the above description. Furthermore, this application is not directed to any particular programming language. It should be understood that the content of this application described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of this application.

[0139] 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.

[0140] The above embodiments merely illustrate the implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A dual-stream communication system with RIS, characterized in that, It includes a signal generation module, a signal processing module, a first feed antenna, a second feed antenna, a first RIS, a second RIS, a first receiving antenna, and a second receiving antenna; The polarization directions of the first RIS and the second RIS are orthogonal to each other, and a dual-plate RIS is used to reflect electromagnetic waves to avoid coupling; The first receiving antenna has the same polarization direction as the first RIS; The second receiving antenna has the same polarization direction as the second RIS; The signal generation module is used to generate a first vector signal and a second vector signal; The first feed antenna is used to transmit the first vector signal, and the second feed antenna is used to transmit the second vector signal; The first RIS is used to reflect the first vector signal, and the second RIS is used to reflect the second vector signal; The first receiving antenna is used to receive the first vector signal reflected by the first RIS, and the second receiving antenna is used to receive the second vector signal reflected by the second RIS; The signal processing module is used to process the first vector signal and the second vector signal; The signal processing module includes a first low-noise amplifier, a first spectrum analyzer, a second low-noise amplifier, and a second spectrum analyzer. The first low-noise amplifier is used to amplify the first vector signal; The first spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the first low-noise amplifier; The second low-noise amplifier is used to amplify the second vector signal; The second spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the second low-noise amplifier.

2. The dual-stream communication system with RIS according to claim 1, characterized in that, The dual-stream communication system with RIS further includes a control device for controlling the signal generation module, the first feed antenna, the second feed antenna, the first RIS, and the second RIS.

3. The dual-stream communication system with RIS according to claim 2, characterized in that, The control device includes a data processor and a first controller and a second controller respectively connected to the data processor; the first RIS is connected to the first controller; and the second RIS is connected to the second controller.

4. A dual-stream communication method, characterized in that, The method is applied to a transmitting device, which includes a signal generating module, a first feed antenna, a second feed antenna, a first RIS, and a second RIS; the method includes: The transmitting device estimates the directions of the first receiving antenna and the second receiving antenna; The transmitting device is configured with the state of the first RIS and the state of the second RIS such that the main lobe direction of the first RIS is aligned with the first receiving antenna in the radiation pattern, and the main lobe direction of the second RIS is aligned with the second receiving antenna in the radiation pattern. The signal generation module generates a first vector signal and a second vector signal; The first feed antenna transmits a first vector signal into free space, and the second feed antenna transmits a second vector signal into free space; The first vector signal is incident on the first RIS, and the second vector signal is incident on the second RIS; The first RIS reflects the first vector signal, and the second RIS reflects the second vector signal; the polarization directions of the first RIS and the second RIS are orthogonal to each other, and a dual-plate RIS is used to reflect electromagnetic waves to avoid coupling; the first receiving antenna has the same polarization direction as the first RIS; the second receiving antenna has the same polarization direction as the second RIS.

5. A dual-stream communication method, characterized in that, The method is applied to a receiving device, the receiving device including a signal processing module and a first receiving antenna and a second receiving antenna respectively connected to the signal processing module; the method includes: The first receiving antenna receives the first vector signal, and the second receiving antenna receives the second vector signal; The signal processing module processes the first vector signal and the second vector signal; The signal processing module includes a first low-noise amplifier, a first spectrum analyzer, a second low-noise amplifier, and a second spectrum analyzer. The signal processing module processes the first vector signal and the second vector signal, including: The first low-noise amplifier is used to amplify the first vector signal; The first spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the first low-noise amplifier; The second low-noise amplifier is used to amplify the second vector signal; The second spectrum analyzer is used to measure the adjacent channel leakage ratio and error vector magnitude of the output signal of the second low-noise amplifier; The first vector signal and the second vector signal are generated by the signal generation module. The first vector signal is transmitted by the first feed antenna and reflected by the first RIS, and the second vector signal is transmitted by the second feed antenna and reflected by the second RIS. The polarization directions of the first RIS and the second RIS are orthogonal to each other. A dual-plate RIS is used to reflect electromagnetic waves to avoid coupling. The polarization direction of the first receiving antenna is the same as that of the first RIS, and the polarization direction of the second receiving antenna is the same as that of the second RIS. The polarization directions of the first receiving antenna and the second receiving antenna are orthogonal to each other.

6. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the dual-stream communication method as described in any one of claims 4-5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, The program is executed by the processor to implement the two-stream communication method as described in any one of claims 4-5.

8. A transmission method, characterized in that, Applied to a dual-stream communication system with RIS according to any one of claims 1-3; the method comprises: The sender estimates the receiver's orientation; The sender configures the states of the two RIS so that the main lobe directions of the two RIS are aligned with their respective receivers in the directional diagrams. The transmitter feeds two data streams into two RIS arrays respectively. The signal is first radiated into free space by the feed source of the RIS array, then incident on the RIS array, and after reflection and phase shifting by each RIS unit, it finally forms a specific reflected beam pointing to its respective receiver. The receiver uses an antenna to receive useful signals and extracts data from the received signals.

Images