一种改进的变步长常模判决反馈盲均衡算法

An improved variable step-size constant modulus decision feedback blind equalization algorithm

针对基于CMA的DFE盲均衡算法收敛速度慢、收敛后稳态剩余误差大的缺点,提出了一种改进的基于CMA的DFE盲均衡算法。该算法通过引入均方误差作为调整步长的参量,构造出指数型变步长函数,把基于CMA的DFE盲均衡算法中前馈滤波器和反馈滤波器更新方程中的固定步长值变为可变值,并对其收敛性做了分析。计算机仿真表明,改进算法具有较快的收敛速度和更小的剩余误差。

Aiming at the shortcomings of slow convergence rate and large residual error Equalization（ CMA-DFE ）, this paper proposes an improved DFE equalization algoritl im based on CM A . In this alg oadopted as the step parameter, and this algorithm constructs the index variable step function. In the DFE based on CMA blind equalization algorithm, the fixed step size of the feedforward filter and the feedback filter updating equation is changed to variable value, and this paper analyzes its convergence. The computer simulation results indicate that the improved algoritlim has faster convergeerror.