基于统计的OFDM符号定时同步

正交频分复用（OFDM）的主要思想是将信道分成若干正交子信道,将高速数据信号转换成并行的低速子数据流,调制在每个子信道上进行传输,每个信道上的信号可以看成平坦性衰落,可以消除符号间干扰。因此,OFDM技术具有很强的抗多径能力和很高的频谱利用率。但是由于OFDM采用了正交的子载波,对同步误差极其敏感。主要研究了OFDM系统的符号定时同步算法,并对现有的算法进行仿真和优化,最终通过硬件调试实现了算法的功能。

Symbol Timing of OFDM System based on Statistics

The principle of OFDM is to divide the channel into orthogonal sub channels,and transform the high speed signal into parallel low speed data streams,these streams are transmitted on flat-fading sub-channels without intersymbol interference.Therefore,OFDM has strong anti-multipath capability and high spectral efficiency.However,OFDM is extremely sensitive to the timing error for its orthogonal sub-carrier technology.This paper mainly studies the symbol timing algorithm of OFDM system,describes the simulation and improvement on the existing algorithm.And finally its functions are realized by hardware debugging.