空时编码DS-CDMA系统下行链路自适应接收机  

Adaptive receiver for the DS-CDMA downlink with space-time coding

作　　者：黄晖[1] 廖桂生[1] 陈建峰[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

出　　处：《西安电子科技大学学报》2002年第6期709-712,771,共5页Journal of Xidian University

基　　金：国家自然科学基金资助项目(69802009)

摘　　要：研究了多径频率选择性衰落信道下DS CDMA系统开环发射分集技术.提出了一种将自适应线性多用户检测与开环发射分集相结合的新检测方法,该方法采用级联处理结构,首先利用去相关滤波器提取每条多径的能量,然后通过空时解码合并信号能量.基于最小输出能量准则的去相关滤波器采用递归最小二乘法,收敛速度快并且对信道估计误差不敏感.利用Alamouti码进行的仿真结果表明,该方法能够在克服信道衰落的同时抑制多址干扰.The method of using open-loop transmit diversity in the DS-CDMA system operating in a frequency selective fading environment was considered. The adaptive linear multi-user detection and open-loop transmit diversity are combined. The method uses the non-joint approach, which combines the signal power by the space-time decoder after extracting the signal on each path by the decorrelator. Based on the MOE criteria and using the RLS algorithm, the detector provides fast convergence and robustness to channel errors. The simulation results using Alamout's code indicate that the proposed processing technique is capable of combating both channel fading and multi-user interference.

关 键 词：空时编码 DS-CDMA系统 下行链路 自适应接收机 发射分集 多用户检测 码分多址 

分 类 号：TN914.53[电子电信—通信与信息系统]