CMA自适应阵列在CDMA通信系统的应用  

The Application of the CMA Adaptive Array to CDMA Communication Systems

作　　者：朱明华[1] 吴惠兰[1] 刘元安[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《电子学报》2003年第4期523-526,共4页Acta Electronica Sinica

基　　金：国家自然科学基金资助项目 (No 69782 0 0 7);教育部博士点基金资助项目

摘　　要：由于CDMA(CodeDivisionMultipleAccess)通信系统实施了功率控制 ,在基带不能直接用CMA进行自适应阵列的波束形成 .通过分析CDMA系统的特点 ,我们提出在接收信号解扩后再应用CMA进行波束形成 .这种新的波束形成方法不仅为CMA自适应阵列在CDMA系统中的应用提供了一种途径 ,而且还能防止CMA收敛到错误信号上 ,从而提高系统的可靠性 .仿真结果表明 ,与全向天线系统相比 ,采用CMA自适应阵列的系统性能有了很大的改善 ,系统的容量得到成倍的增加 .在强干扰情况下 ,虽然CMA的干扰方向信号抑制效应变弱 。In CDMA communication systems,CMA can not be used to perform beamforming directly in baseband because of power control when base station adopts antenna array.According to the principle of spread communication,a new beamforming method with CMA for CDMA systems is suggested.This new method can not only make the CMA adaptive array be available in CDMA systems,but also prevent CMA from converging on undesired signals.The results of simulation show that the system performance with the CMA adaptive array can be improved greatly compared with omni-antenna systems.Even under circumstance of strong interference,the performance improvement of such system is also quite evident.

关 键 词：CMA自适应阵列 码分多址 波束形成 

分 类 号：TN929.533[电子电信—通信与信息系统]