低计算复杂度的多级软判决均衡器用于干扰抑制  

Multistage Soft Decision Equalizers with Low Computational Complexity for Interference Suppression

作　　者：朱仁祥[1] 吴乐南[1] 

机构地区：[1]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2期303-306,共4页Journal of Signal Processing

基　　金：国家自然科学基金(60472054);东南大学优秀博士学位论文基金(0602)资助课题

摘　　要：针对通信系统中非线性均衡器的计算复杂度问题,提出一种基于最低误码率准则的多级软判决均衡器。通过调节各级均衡器的拒绝门限,可使多级软判决均衡器在计算复杂度与误码率之间取得折衷。仿真表明:对于扩展的二元相移键控信号,在相对强的调频信号和调幅信号的联合干扰下,匹配滤波器和基于最小均方误差准则的线性均衡器已失效,而基于最低误码率准则的多级软判决均衡器仍能表现出良好的性能,并且大大减少计算复杂度。此外,还发现一个有趣的结果,即多个不同的非线性均衡器的协作可获得比单个均衡器更优的性能。A multistage soft decision equalizer based on minimum bit error rate principle is proposed in this paper for reducing computational complexity in communications. Bit error rate and computational complexity can be compromised by the control of rejection threshold of each stage. Simulation results show that when extended binary phase shifting keying signals are contaminated by the mix of relatively strong interference signals of amplitude modulation and frequency modulation, the performance of matched filters and linear e- qualizers based on minimum mean square error principle degenerate rapidly, but multistage soft decision equalizers provide very low bit error rate, and the computational complexity is greatly reduced. Furthermore, an interesting result is found that by cooperation of different nonlinear equalizers, the performance that is superior to that of each single equalizer can be obtained.

关 键 词：非线性均衡器 干扰抑制 通信信号处理 多级软判决均衡器 

分 类 号：TN911[电子电信—通信与信息系统]