多用户检测CDMA系统的阻塞度量和控制  

Congestion measure and control in a CDMA system with multi user detectors

作　　者：张武荣[1] 赵建平[1] 吴伟陵[1] 

机构地区：[1]北京邮电大学信息工程系,北京100876

出　　处：《通信学报》2000年第3期19-24,共6页Journal on Communications

基　　金：国家自然科学基金重大资助项目!(6 9896 2 4 3)

摘　　要：本文讨论了CDMA系统在多用户检测和单用户检测两种情况下系统的阻塞度量和控制问题 ,并给出了相应的用户功率平衡方程和小区干扰平衡方程。本文证明两种平衡方程有相同的阻塞因子 ,但干扰平衡方程的维数与系统内小区数相等 ,并远小于用户功率平衡方程的维数即系统用户数 ,因而降低了计算复杂度。理论和模拟结果表明多用户检测系统中平衡方程有更小的阻塞因子 ,因而相对应的迭代算法能很快收敛 ,并且系统的阻塞率得到降低。This paper deals with the congestion measure and control problems of a CDMA system with,as well as without ideal multi user detectors The user power balance equation and the cell interference balance equation are derived The dimension of the proposed cell interference balance equations is equal to the number of cells in the system,which is far less than the dimension of user power balance equations,the number of users Thus,the computational complexity is reduced Theoretic and simulation results show that system with multi user detectors has smaller congestion indicator,hence the related iterative algorithms converge faster and the congestion rate is reduced Combining multi user detector and power control reduces the consumed power,which in turn converts to the increase in system capacity

关 键 词：移动通信系统 码分地址 多用户检测 

分 类 号：TN929.5[电子电信—通信与信息系统]