CDMA系统下行链路的干扰抵消

CDMA蜂窝移动通信系统是一种采用多址技术的通信系统，即采用不同的地址码来区分用户、基站和信道。然而由于其在多径衰落信道中的自相关和互相关特性的不理想造成了多址干扰。在扩频通信系统的下行链路中，有效地抵消多址干扰是进一步改善系统性能和提高系统容量的重要途径。本文提出一种应用于CDMA下行链路的干扰抵消算法，分析了下行链路接收机的实现原理及过程，并对其中的关键算法进行了详细地分析，仿真结果表明，所选取的下行接收算法能改善系统的性能。

Interference Cancellation Algorithms for Downlink CDMA Communications

CDMA mobile communication system adopts multiple access techniques which means different address codes are used to distinguish users,base stations and channels.However,due to the imperfection of auto-correlation and cross-correlation of address codes in multiple-path fading channel,there is multiple access interference between users.So in spread spectrum communication system,interference cancellation is an important way to enhance system performance and system capacity.In this paper,the interference cancellation of the code division multiple access signals at the mobile unit is considered.The receiver principle for CDMA downlink is described,and the algorithm is analyzed in detail in this paper.At last,simulation results have proved the algorithm has good performance.