Design And Implementation Of Wireless Communication System Based On Programmble Metasurface

Since the beginning of the 21 st century,new material technologies and mobile communication technologies have developed rapidly.Artificial electromagnetic metamaterials continue to receive the attention of researchers due to their unique physical properties.At present,there are many application examples of metamaterials in various fields such as digital imaging,electromagnetics,and radar.At the same time,some studies have shown that digitally programmable metamaterials can carry information through coding and control,giving the possibility of combining electromagnetic supermaterials with wireless communication.In this context,this paper studies the design and implementation of a novel wireless communication system based on programmable metamaterials.A new wireless communication system is designed around programmable metamaterials.The digital programmable hypermaterial is used to complete the wireless signal from baseband to RF.Direct modulation and transmission,and the method of generating super-material digital driving signals under single-carrier and multi-carrier communication,and through hardware development and experiment of FPGA,the wireless communication system based on programmable metamaterial can utilize FSK,2x2 The modulation mode such as MIMO-QAM is normally and stably transmitted to transmit multimedia signals such as pictures and videos.The combination of this metamaterial and wireless communication provides a new idea and possibility for building a new communication system architecture.Firstly,after completing the investigation of the research and application status of electromagnetic metamaterials,this paper studies the carrier modulation by using programmable metamaterial instead of the transmitter RF front end.By observing the response of the programmable metamaterial to the incident single tone carrier,the signal model is constructed,revealing the nature of its ability to change the amplitude and phase of the signal.After giving a general wireless communication system model based on programmable metamaterials to complete carrier modulation,the generation steps of programmable hypermaterial digital drive sequences are given for single-carrier and multi-carrier modulation schemes,which lays a theoretical foundation for the realization of prototype system.Then,for the single-carrier modulation scheme,BFSK is taken as an example to analyze the transmission performance of the programmable metamaterial communication system and make related measurements.After introducing the phenomenon that the super-material digital driving voltage produces non-ideal FSK signal due to quantization,the signal is modeled and derived under the Gaussian channel to obtain the bit error rate performance when the system adopts non-coherent demodulation.The array gain is briefly analyzed for the array characteristics of metamaterials.At the same time,the LabView FPGA hardware programming realizes the function of transferring pictures in real time by using the system.Finally,this paper combines programmable metamaterials with MIMO technology to complete the transmission and related measurements of wireless communication systems in the 2x2 MIMO-QAM system.The problem that the pilots of different data streams are interfered by their own local oscillator signals when using MIMO signals generated by metamaterials is analyzed.Based on this,the scheme of transmitting signals on harmonics is given,that is,the digital driving voltage is used in a single data transmission interval.The internal cyclic shift enables precise harmonic phase control,and the amplitude variation of the phase is used to realize the amplitude control of the harmonics,and the function of transmitting the two-way video stream is realized by LabView FPGA hardware programming.