基于MMSE检测的分组串行干扰抵消检测器  

Group Successive Interference Cancelator Based on Mini mum Mean-Square Error Detection

作　　者：张东红[1,2] 廖桂生[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071 [2]安康学院应用数学系,陕西安康725000

出　　处：《西南交通大学学报》2010年第5期739-744,共6页Journal of Southwest Jiaotong University

基　　金：国家自然科学基金资助项目(60472097;60502045);教育部新世纪优秀人才基金资助项目(NCET-04-0947);陕西省教育厅专项科研基金资助项目(08JK208)

摘　　要：为减小传统串行干扰抵消(SIC)检测器的时延,改善每一级的检测性能,采用对角加载法和组距分组法,提出了一种改进的SIC检测器.该检测器对每一级用户特征波形的相关矩阵进行对角加载,通过加载量的选择,使得分组用户的输出信干比最大,从而实现最小均方误差(MMSE)检测,检测器每一级线性算子的更新仅与对角加载量有关.理论分析和仿真结果表明,与传统的SIC检测器和MMSE检测器相比,改进的SIC检测器降低了检测时延,误码率更低.In order to reduce the demodulation delay of the conventional successive interference cancelator（SIC） and improve the BER（bit error rate） performance of each stage,an improved SIC was proposed based on the diagonal loading method and the interval grouping method.This improved SIC loads the correlation matrix of each stage diagonally.Through the selection of loading parameters,the output signal interference ratio of grouping users is maximized so that the minimum mean-square error（MMSE） detection can be realized and the update of the linear operator in each stage is only related to the diagonal loading parameters.Theoretic analysis and simulation results show that compared with the conventional SIC and the MMSE detector,the improved SIC reduces demodulation delays and achieves a better BER performance.

关 键 词：对角加载 MMSE检测 分组检测 串行干扰消除 误码率 

分 类 号：TN914.4[电子电信—通信与信息系统]