一种改进的变步长常数模算法

A Modified Variable Step Size Constant Modulus Algorithm

常数模算法是一种最为常用的盲均衡算法,普遍应用于恒包络信号和非恒包络信号的均衡,但存在收敛速度慢和剩余误差大的缺点。在深入研究常数模算法的基础上,该文提出一种改进的变步长算法,对其性能进行了理论分析,并对二值序列以及正交幅度调制信号进行了仿真。理论分析和仿真结果表明:该算法具有收敛速度快、剩余误差小的特点。

Constant modulus algorithm is a most popular algorithm and is widely used for blind equalization of non-constant envelope signals and constant envelope signals. But it exhibits very slow convergence speed and large residual error. A modified variable step size algorithm is proposed based on constant modulus algorithm. Its theoretical analysis is made and it is simulated with binary sequence and quadrature amplitude modulation signals. Theoretical analysis and simulation results show that it has the characteristics of fast convergence speed and small residual error.