复值的MBER非线性均衡器用于QAM信号  

Complex-Valued Minimum Bit Error Rate Nonlinear Equalizers for QAM Signals

作　　者：邬正义[1] 朱仁祥[2] 吴乐南[3] 

机构地区：[1]常熟理工学院物理与电子工程学院,常熟215500 [2]宁波工程学院电子与信息工程学院,宁波315016 [3]东南大学信息科学与工程学院,南京210096

出　　处：《信号处理》2009年第12期1956-1961,共6页Journal of Signal Processing

基　　金：国家自然科学基金(60872075);江苏省自然科学基金(BK2007103);国家863计划(2008AA01Z227)资助课题

摘　　要：本文提出一种复值的最低误码率非线性滤波器用于非线性信道中QAM信号的均衡。推导了针对QAM信号的最低误码率准则训练算法的目标函数,并用Volterra序列来实现复值的非线性均衡器。为使非线性均衡器能在线自适应训练并增加训练算法的数值稳定性,提出一种滑窗随机梯度算法。大量仿真表明,对于非线性信道中QAM信号的均衡,最低误码率非线性均衡器的性能优于最小均方误差准则。A complex-valued minimum bit error rate （MBER） nonlinear equalizer is proposed for equalization of quadrature-amplitude modulation （QAM） in nonlinear channels. The MBER objective function for QAM is derived and complex-valued nonlinear equalizers are realized via Volterra series. In order to train the equalizers online and improve robustness of training, a sliding-window stochastic gradient algorithm is proposed. Extensive simulations show that the performance of MBER equalizers is superior to that of minimum mean square error equalizers for QAM in nonlinear channels.

关 键 词：非线性均衡器 最低误码率 QAM 非线性信道 

分 类 号：TN911[电子电信—通信与信息系统]