基于FPGA的OFDM通信系统设计与实现

摘要

为在复杂环境下实现远距离抗干扰通信,设计并实现一种基于现场可编程门阵列(FPGA)的正交频分复用(OFDM)通信系统,给出系统方案及关键技术的实现方法.在设计中采用基于前导序列的符号同步算法,实现精确的符号同步,避免同步点靠后而产生符号间干扰.采用一种基于导频的剩余相位补偿算法,消除频率同步后的残余频偏,达到更好的解调效果.实际测试结果表明,该系统能够有效地同步及消除残余频偏,稳定地通信.%To achieve anti-jamming communication over long distance,an orthogonal frequency division multiplexing (OFDM)communication system based on field programmable gate array (FPGA) was designed,and the system architecture and implementation methods of the critical technology were given.Symbol synchronization algorithm based on preamble sequence was adopted to achieve the accurate symbol synchronization.This method can avoid intersymbol interference caused by inaccurate synchronization.A residual phase compensation algorithm based on pilots was proposed to eliminate the residual frequency offset after frequency synchronization to achieve better demodulation results.Experimental results indicate the proposed system can work stably with precise synchronization and negligible frequency offset.