适用于高阶QAM系统的多模盲均衡新算法

Multiple Modulus Blind Equalization Algorithms for High-Order QAM System

利用QAM信号星座图特点,该文提出了两种含软判决的多模盲均衡算法:MMA+SDD算法和SMMA+SDD算法。两种算法都克服了CMA算法剩余误差大的缺点,在均衡的同时能够克服相位偏转。从仿真结果看,两种新算法的收敛性能和稳态均方误差较CMA+SDD有了进一步提高,其中,MMA+SDD收敛性能最佳,SMMA+SDD的计算复杂度最低。

In this paper, two multiple modulus algorithms（MMA＋SDD and SMMA＋SDD） are proposed based on the characteristic of the QAM signals, which overcome CMA＇s larger residual error and recover the rotation of the phase at the same time. Computer simulations show that the proposed algorithms lead to faster convergence rates and lower steady-state Mean Square Error（MSE） after convergence compared with the concurrent CMA and SDD algorithm. The MMA＋SDD has the best performance and the SMMA＋SDD has the least complexity among the three algorithms.