Multi-user wireless communication system and method based on space-time coding metasurface

Abstract

The invention discloses a multi-user wireless communication system based on a time-space coded supersurface. The transmitting end mainly includes a time-space coded metasurface, a feed antenna, and a digital control module; the receiving end is a traditional demodulation device. The invention also discloses the wireless communication method of this system. The feed antenna transmits a single-tone signal to the metasurface, and uses an algorithm to optimize the space-time encoding matrix, and jointly controls the energy distribution of the reflected signal in the space domain and the frequency domain, so that different harmonics The spatial beam of the system points to users in a specific direction for direct encoding of information; through the digital control module, different space-time encoding matrices are switched in real time, and different information is transmitted to multiple designated users simultaneously and independently, while users in other directions cannot demodulate. The transmitter has the characteristics of directional modulation, which can realize confidential communication and anti-interference; it also acts as a space mixer and antenna radiation, eliminating the need for digital-to-analog conversion, mixing and amplification RF modules, simplifying the communication transmitter architecture.

Description

technical field [0001] The invention relates to the technical field of wireless communication and novel artificial electromagnetic materials, in particular to a multi-user wireless communication system and method based on a space-time coding metasurface. Background technique [0002] A new type of artificial electromagnetic surface, referred to as a metasurface, is developed from metamaterials with three-dimensional volumetric structures. Because metasurfaces have a negligible vertical dimension compared to the wavelength, and have the characteristics of thinness, low loss, easy processing, and easy integration, they have attracted extensive research by scholars at home and abroad in recent years. Through the spatial arrangement of the characteristics of the design unit, it can be used to control the amplitude, phase, frequency, polarization, orbital angular momentum, waveform and other parameters of electromagnetic waves, and has been applied in scientific research and engi...

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Problems solved by technology

[0004] Purpose of the invention: the purpose of the present invention is to solve the problem that the existing mobile communication signal modulation method receives and demodulates the same information for users in different directions, does not have the function of multi-channel simultaneous and independent transmission, and cannot realize the problem of confidential communication

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