非常数模信号的水声信道稳定盲均衡算法研究

水声信道中存在有大量的脉冲噪声和多普勒频移效应,这会造成水声通信系统最佳采样位置发生偏移,对均衡算法的稳健性造成严重影响。本文从提高均衡算法稳健性的角度出发,借助早迟积分比相原理完成对采样位置的跟踪,同时采用均衡滤波器系数变化量的Euclid范数作为代价函数,提出了一种归一化修正常模盲均衡算法,并用判决正方形方法进行了改进。仿真结果表明,在高阶QAM通信系统中,所提出的算法具有更好地收敛能力与稳定性,保证了水声通信的高效运行。

Research on a steady blind equalization algorithm suitable for non-constant modulus signals used in underwater acoustic channels

There are serious Doppler frequency shift and a lot of impulse noises in the underwater acoustic channels which will cause the best sampling position offset and deteriorate the robustness of equalization algorithm. Aiming to improve the robustness of equalization algorithm,this article adopts the theory of early-late integration phase comparison to track the sampling position and brings forward one new normalized modified constant modulus algorithm which takes euclid norm of changes in equalization filter a...