一种基于MMSE准则的通用码元同步算法

An Universal MMSE Software Synchronized Algorithm

同步是影响通信系统性能的一个极其重要的因素。本文提出了一种基于最小均方误差准则(MMSE)的基带软件码元同步算法,可以实现多进制FSK、DPSK甚至QAM等信号的码元同步。本算法选择均方误差最小的采样时刻作为最佳判决时刻,由于使用解调误差实现同步的调整,节省了运算量。算法具有实用性好,通用性强的特点。系统仿真的测试结果表明:算法的性能基本可以满足实际通信系统对码元定时恢复的要求。

Synchronization （symbol timing recovery） is a very important factor in software radio. A base band synchronized method based on MMSE criterion which can be used in MFSK, MDPSK even though QAM is presented. It chooses the sampling points with least mean square errors of demodulation as the optimum ones to make decisions. The demodulation error is used to adjust the decision point, consuming less resources of DSP. The algorithm is more practical and universal. The results of simulation indicated that the algorithm can satisfy the essential demands of practical communication systems.