一种改进的基于训练序列的OFDM符号同步算法

同步对于OFDM(正交频分复用)系统非常重要。针对S&C算法和Park算法定时模糊的问题,提出一种改进的符号同步算法。该算法先通过接收信号与训练序列进行互相关确定OFDM符号的可能起始位置,然后再滤波进一步确定OFDM符号准确的起始位置。仿真结果表明:改进算法的定时度量在低信噪比和多径衰落信道环境下都具有脉冲型峰值,较传统方法有较小的均方误差。

An improved training-sequence-based OFDM symbol synchronization algorithm

Synchronization is very important to OFDM systems. In view of timing obscurity of the S&C and Park algorithms, we propose an improved symbol synchronization algorithm. The new method first identifies the probable initial position of the OFDM symbol by correlating the received signals with the known training sequence, and then further identifies its accurate initial position by filtering the correlation operation result. Simulation results show that the timing metric of the improved algorithm has an impulse-shaped peak in the conditions of low SNR and multi-path fading channel and smaller Mean Square Error (MSE) in timing than the conventional methods.