Abstract: For overcoming effect of the underwater acoustic channel on communication quality, a new style of error function weighted by a variable coefficient is proposed, on the basis of analyzing the feature of the usual traditional error functions and Decision Feedback Equalizer（DFE）. And a new blind decision feedback equalization algorithm（VCMDFE） based on the new error function is proposed too. In this proposed VCMDFE algorithm, the variable coefficient can adjust the value of the error function according to the progress of equalization, so as to have faster convergence rate and lower residual error than CMDFE. The efficiency of the proposed VCMDFE algorithm is proven by computer simulation with underwater acoustic channels.

Key words: variable weighted coefficient, error function, decision feedback

摘要： 针对严重失真的水声信道，在分析几种常用传统误差函数和判决反馈均衡器（DFE）的基础上，构造了一种变系数加权误差函数，对DFE权向量进行更新，提出了基于变系数加权误差函数的判决反馈盲均衡算法（VCMDFE）。与基于传统误差函数的判决反馈盲均衡算法（CMDFE）相比，新算法能够根据均衡的进度，利用一变系数去调节误差函数数值的大小，以取得比CMDFE算法更快的收敛速度和更低的稳态误差。水声信道的仿真结果验证了该算法的有效性。

关键词: 变系数, 误差函数, 判决反馈