异步CDMA系统中的LCDCM多用户检测器  

LINEAR CONSTRAINED DIFFERENTIAL CONSTANT MODULUS MULTIUSER DETECTOR FOR ASYNCHRONOUS CDMA SYSTEMS

作　　者：周先春[1] 

机构地区：[1]南京邮电学院信息工程系,江苏南京210003

出　　处：《安徽师范大学学报（自然科学版）》2004年第4期410-413,共4页Journal of Anhui Normal University(Natural Science)

基　　金：江苏省自然科学基金(01KJB510003).

摘　　要：将线性约束差分恒模算法(LCDCM)应用于异步CDMA系统的多用户检测.该检测器只要求了解目标用户的信息,运算较简单,且由于采用了自适应方法,检测器无需估计信号的幅度.分析及仿真结果表明,LCDCM检测器有很好的收敛速度和干扰抑制度,其性能优于传统检测器,且对用户数目的变化有很好的适应性.In this paper, the LCDCM algorithm is applied to the MUD for asynchronous CDMA systems. This LCDCM detector requires only the information of the target user, and is therefore simple in calculation. Additionally, due to the automatic adaptation it adopts in the algorithm, the estimation of signal amplitude is no longer a necessity. Analysis and simulation show that the LCDCM detector converges fast and mitigates interference deeply, its performance outperforms the conventional detection ,and it is insensitive to the change of the number of mobile users.

关 键 词：CDMA系统 多用户检测器 异步 恒模算法 干扰抑制 信号 幅度 线性约束 收敛速度 估计 

分 类 号：N941.5[自然科学总论—系统科学] TN92[电子电信—通信与信息系统]