Design And Implementation Of OFDM Wireless Communication System Based On FPGA

In recent years,portable high-definition wireless video transmission has become more and more widespread,and portable wireless communication systems with high speed and strong anti-jamming ability have been widely used.With the rapid development of communication systems,communication systems need to be rapidly upgraded.Field Programmable Gate Array(FPGA)is widely used in baseband processing of communication systems due to its programmability,compatibility,low cost and low power consumption.Firstly,based on the required performance parameters of wireless communication system,this paper designs the basic parameters of OFDM communication system with the background of short-distance and high-speed portable wireless video communication between central node and mobile node,as well as between mobile node and mobile node.At the same time,the key synchronization technologies and existing synchronization algorithms in OFDM communication are analyzed.Aiming at the characteristics of portable mobile communication such as good real-time,high speed,low power consumption and anti-multipath fading,based on the study of Schmidl-Cox symbol synchronization algorithm and Park symbol synchronization algorithm,the structure of training sequence and measurement function are redesigned,and an OFDM synchronization method suitable for portable wireless video communication is proposed,which is implemented in multipath fading channel with the simplest algorithm possible.Good synchronization performance.The simulation results show that when the SNR is greater than 4dB,the accurate timing can be achieved under the 6-path TU-6 channel,and the mean square error of carrier frequency offset estimation is less than 0.0004.The algorithm can be well applied to portable wireless video communication system.Secondly,based on the basic parameters of the OFDM communication system,the Altera Quartus II development platform and Modelsim SE-64 simulation software are used for hardware design and simulation,including working clock generation module,scrambling and descrambling module,convolutional coding module,16 QAM modulation.And demodulation module,FFT module,cyclic prefix addition and windowing module.Finally,noise is added to the transmitted signal to verify the performance of the entire transceiver system.Finally,the symbol synchronization algorithm proposed in this paper is designed and implemented by the Quartus II development platform,including the coarse symbol synchronization module and the fine symbol synchronization module.The model synchronization simulation module is designed and debugged by Modelsim.The results show that the proposed algorithm can effectively perform symbol synchronization.