基于多用户反馈的判决反馈均衡器的研究

本文提出的一种新颖的基于多用户反馈的判决反馈均衡器,解决了在CDMA多用户检测中传统自适应判决反馈均衡器误码率高、系统容量小的缺点.它由具有误差反馈滤波器的判决反馈均衡器(Decision Feedback Equalizer with Error Feedback Filter,DFE-EFF)构成,并在判决后反馈多用户数据抵消多址干扰(多用户反馈干扰抵消).文中给出其结构图,分析各种判决反馈均衡算法.理论证明,具有误差反馈滤波器的多用户反馈干扰抵消判决反馈均衡器(多用户反馈干扰抵消DFE-EFF)较各种判决反馈均衡器为最优,它能同时有效处理ISI,MAI和噪声的干扰.仿真结果表明,在误码率性能和系统容量两方面,多用户反馈干扰抵消DFE-EFF比DFE、DFE-EFF均有较大改善.

A Study of Multiuser Feedback-Based Decision Feedback Equalizer

Multiuser interference cancellation decision feedback equalizer with error feedback filter (MIC DFE-EFF),for DS-CDMA,based on multiuser feedback structure,has been proposed.It has solved this problem that conventional adaptive decision feedback equalizer has higher bit error rate (BER) and smaller capacity.In this paper,we depict the structure of MIC DFE-EFF,analyse its algorithm and relative algorithm.It can deal with intersymbol interference (ISI),multiple access interference (MAI) and noise at the same time.Simulation results show that the proposed MIC DFE-EFF outperforms conventional DFE、DFE-EFF and PIC at bit error rate (BER) performance,also its capacity is larger than DFE and DFE-EFF.Although MIC DFE-EFF increase computational complexity compared to DFE-EFF,its computational complexity is less than PIC.