异步多径CDMA系统中的线性判决反馈多用户检测  

Linear Decision Feedback for Multiuser Detection in Asynchronous Code-Division Multiple-Access Systems

作　　者：李刚[1] 李道本[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《北京电子科技学院学报》2004年第2期82-86,共5页Journal of Beijing Electronic Science And Technology Institute

摘　　要：设计CDMA最佳接收机要考虑的重要因素是减少和消除系统中存在的符号间干扰(ISI)及多址干扰(MAI)。干扰的消除可由均衡及多用户检测技术来实现。本文针对异步CDMA的上行链路系统模型,以最小均方误差(MMSE)作为检测准则,采用并行的部分判决反馈方法进行干扰抵消,推导出一种能同时消除ISI并且极大限度抑制MAI的判决反馈型多用户检测器结构,并通过仿真证明其具有比传统线性检测器更为优良的抗干扰性能。The interference cancellation or suppression is an important factor for the design of optimum CDMA receiver. It can be achieved by equalization as well as multi-user detection technique. Based on the up-link asynchronous CDMA model, a MMSE-based decision-feedback detector which can eliminate ISI and greatly suppress MAI is introduced in this paper. The simulation test proved that this detector could greatly suppress interference as compare to traditional linear detectors.

关 键 词：多用户检测 判决反馈 MMSE 异步CDMA 干扰抵消 

分 类 号：TN929.533[电子电信—通信与信息系统]