一种异步CDMA智能天线系统的盲空时接收机  

Blind Spatial-Temporal Receiver in Asynchronous CDMA Smart Antenna System

作　　者：李轶鹏[1] 叶中付[1] 徐旭[1] 

机构地区：[1]中国科学技术大学统计信号处理研究室,合肥230027

出　　处：《数据采集与处理》2005年第1期59-63,共5页Journal of Data Acquisition and Processing

基　　金：安徽省自然科学基金 ( 0 0 0 43 2 0 9)资助项目

摘　　要：提出一种新的基于异步 CDMA蜂窝通信系统的盲二维 RAKE接收机。系统中采用智能天线结构。在接收信号矢量经过传统的匹配滤波器后 ,按照“最大信干比”准则选取输出矢量样本 ,并进行最优化空时二维合并。采用这种接收结构 ,当系统具有较大扩频增益时 ,能够在没有任何用户多径的先验知识以及码同步的前提下 ,充分有效地利用多径环境的延时结构 ,因而可以使用较低的空时处理维数在抑制多址干扰的同时充分地合并强多径分量。仿真结果表明 :该接收机能够以简单的结构和较低的复杂度实现良好的性能 。A novel blind 2-D RAKE receiver based on asynchronous CDMA cellular communication systems equipped with a smart antenna is presented. After the received signal vectors are sent into the conventional matched filter, the sample vectors that maximize “signal-to-interference ratio” at the output of the filter are collected, and optimally combined across both space and time. Using the received structure, the time structure in multipath environment can be sufficiently exploited without any a prior knowledge or code synchronization when the spreading gain of system is sufficiently large. Therefore, it can suppress multiple-access interference while simultaneously combining strong multipath components, with a low spatial-temporal processing dimension. Simulation results show that the receiver can achieve good performance with a simple structure and the low complexity, so it can significantly improve the overall signal-to-interference ratios compared with previous receivers.

关 键 词：接收机 CDMA 信干比 多径 智能天线系统 异步 空时处理 先验知识 仿真结果 矢量 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN92[自动化与计算机技术—计算机科学与技术]