新的混合型盲均衡算法  

New mixed blind equalization algorithm

作　　者：耿天玉[1] 舒勤[1] 应大力[1] 

机构地区：[1]四川大学电气信息学院,成都610065

出　　处：《计算机应用》2012年第3期783-786,790,共5页journal of Computer Applications

摘　　要：针对恒模算法(CMA)仅适用于模值为常数的信号,对高阶QAM信号的均衡效果差这一问题,结合CMA与判决引导(DD)算法各自的优点,提出一种CMA与DD算法相结合的改进混合型算法。在算法初期,利用CMA+DD并行算法使系统眼图睁开;然后,再转换到DD算法来进一步减小剩余误差。仿真结果表明,采用新算法对高阶信号均衡有较快的收敛速度和较小的剩余误差,星座图恢复很紧凑,并且改进算法能修正相位和跟踪信道。Constant Modulus Algorithm（CMA） is only suited to balance the signals with modulus of the same value,but not suited to balance the high-order Quadrature Amplitude Modulation（QAM） signals.Combined with the virtues of CMA and Decision-Directed（DD） algorithm,an improved mixed blind equalization algorithm had been presented.First,the improved algorithm would make the system eye open using the CMA＋DD parallel algorithm,and then switch to the DD algorithm to further reduce the residual error.The simulation results indicate that the improved algorithm has a very fast convergence speed,as well as a very small residual error for high-order QAM signals,and constellation recovery plan is very tight.Meanwhile,the improved algorithm can correct phase,and trace channel.

关 键 词：恒模算法 判决引导算法 混合型算法 均方误差 高阶QAM信号 

分 类 号：TN911.5[电子电信—通信与信息系统]