基于瑞利分布误差函数的模式切换盲均衡算法

摘要

Aiming at shortcomings of the existing constant modulus algorithm and the dual‐mode hybrid blind equalization algo‐rithm ,the RDCMA algorithm based on the error function of Rayleigh distribution was proposed and dual‐mode switching struc‐ture decision system based on circular domain of signal to noise ratio was adopted .For RDCMA algorithm ,same error compensa‐tion was given to the signals deviated from the same distance and the system remained at the high convergence speed .The dual‐mode algorithm based on mode switching led the system with stable convergence to a further reducing steady‐state error system by decision directed algorithm through circle domain decision .Simulation results of Matlab show that the algorithm has higher convergence speed and lower mean square error .%针对现有常数模算法和双模式混合盲均衡算法的不足，提出基于瑞利分布误差函数的RDCM A算法并采用基于系统信噪比圆域判决的模式切换结构系统。RDCM A算法主要从误差函数的角度对偏离相同判决距离的输出信号点给予相同补偿，使系统保持较快的收敛速度；通过判决圆域，模式切换型双模式算法将达到稳定收敛的系统切换到判决引导算法，进一步降低系统稳态误差。M atlab仿真结果表明，该算法具有较快的收敛速度及较低的均方误差特性。