一种改进的正交频分复用信道同步估计算法

An improved synchronization algorithm of orthogonal frequency division multiplexing

针对当前正交频分复用系统的同步算法检测正确率低、计算复杂度高的难题,提出一种改进正交频分复用信道同步估计算法。首先对正交频分复用的工作原理进行分析,并构建加权的横幅零自相关特性序列,然后分别对OFDM系统定时和频偏同步进行估计,最后采用具体实例对算法的性能进行测试。测试结果表明,相对于当前经典同步算法,本文算法降低了定时同步估计误差,提高了检测正确率,提高了系统的通信性能。

The detection rate of the current synchronization algorithm for orthogonal frequency division multiplexing system is low and the computation complexity is high,an improved channel estimation algorithm of orthogonal frequency division multiplexing system is proposed. Firstly,the working principle of orthogonal frequency division multiplexing is analyzed,and construct the new banner zero weighted autocorrelation characteristic sequence,and secondly,the timing and frequency offset synchronization of orthogonal frequency division multiplexing system are estimated separately,finally the estimation performance of classical orthogonal frequency division multiplex channel synchronization algorithms and the proposed algorithm are tested by specific examples. The test results show that,compared with the classical synchronization algorithms,the proposed algorithm can reduce the missing rate of timing synchronization,and reduce the computational complexity of channel estimation,so it can improve performance effectively of communication system.