DVB中广泛使用的CMA均衡算法一直深受伪收敛问题的困扰。从CMA算法的代价函数、迭代方程 及初始化系数等方面对伪收敛问题进行研究，在此基础上提出一种带时延估计的CMA改进算法。该算法通过引 入时延校正因子来调整主径的位置，从而避免了伪收敛现象。计算机仿真表明该方法大大提高了原算法的收敛 性，并且具有运算量小、易实现的优点，是一种实用性较强的改进算法，适用于高速的３G互连应用。

The convergence of the Constant-modulus algorithm widely used in DVB system is a complex problem.Firstly,some influencing factors such as cost function,iterative equation and filter coefficients are considered;then,in this paper,an ameliorative algorithm with time-delay estimate is proposed,which can avoid converging to the ill solution by correcting the position of main path.Simulation results demonstrate the proposed algorithm can highly improve the convergence performance of the primary one.Besides,its simplicity and efficiency make it feasible in the high-rate 3G connection application.

汪姬（1983－），女，安徽合肥市人，硕士，东南大学助教，主要研究方向为无线通信、信号与信息处理