一种快速收敛的水声信道分数间隔盲均衡算法

为了加快常数模盲均衡算法(CMA)的收敛速度并降低剩余均方误差,提出了一种快速收敛的分数间隔常数模算法。新算法采用T/2分数间隔均衡器,针对水声通信中常用的BPSK信号,设计了一个新的误差函数,取代常数模算法中的误差函数。最后,采用浅海水声信道进行了仿真,结果表明,新算法性能稳定;收敛速度高于常数模算法和分数间隔常数模算法;剩余均方误差与分数间隔常数模算法处于同一水平。

A Fast Convergence Fractionally Spaced Algorithm for Blind Equalization of Underwater Acoustic Channel

To increase the convergence rate and achieve lower residual mean square error of the CMA(Constant Modulus Algorithm),a FCFSE-CMA(Fast Convergence Fractionally Spaced CMA) algorithm is proposed.The new algorithm employs a T/2 spaced equalizer.The error function of CMA is replaced by the new one.The new error function is specifically designed for the BPSK signal,which is commonly used in the underwater acoustic channel.Computer simulations based on the shallow water acoustic channel demonstrate that compared with the CMA and FSE-CMA(Fractionally Spaced CMA) the new algorithm has advantage of robustness in the aspect of the convergence rate and has the same level of residual mean square error compared with FSE-CMA.