宽带无线通信OFDM系统符号定时同步技术的研究

Technology of Broadband Wireless Communication Based on OFDM System Symbol Timing Synchronization

针对宽带无线通信中的OFDM系统在多径衰落条件下易受符号定时同步偏差影响的问题,提出了一种符号定时同步算法,该算法包括时域符号定时粗同步估计和频域符号定时细同步估计。仿真结果表明,改进的算法和几种典型的定时同步估计算法相比,解决了同步头摆动和在多径信道条件下估计不准确的问题,使得符号定时偏移均方误差减小,同时使得符号差错率大大降低。

Aiming at the vulnerable problems of Broadband wireless communication for the OFDM system in multipath fading conditions,a kind of symbol timing synchronization algorithm is proposed,including time domain symbol timing coarse synchronization estimation and frequency domain symbol timing fine synchronization estimation.The simulation results show that the improved algorithm and several kinds of typical timing synchronization estimation algorithm solve the problem of the swinging of the synchronization head and the inaccurate estimation in the multipath channel conditions,make the symbol timing offset mean square error decreased,and at the same time make the symbol error rate greatly reduced.