摘要
本文针对移动CDMA加性白高斯噪声和衰落信道 ,提出了一种自适应分布式多用户检测算法 .它由空间分集和解相关检测复合组成 .解相关检测器的性能近似最佳多用户检测器 ,且不依赖于其它用户的信号能量及衰落特性 .基于随机梯度技术的盲自适应分集合并方案由最佳似然比检验准则构成 .对其性能做了理论分析和数值估计 ,并与传统的选择法、等增益法及最大比值法做了比较 .所提出的方法易于实时实现 。
In this paper,an adaptive distributed multiuser detection is proposed for code-division multiple access (CDMA) system in both additive white Gaussian noise and fading channels.It combines spatial diversity and decorrelating detection.The performance of decorrelating detector is almost as good as the optimal detector,and does not depend on the other users' energies and the other users' fading characteristics.The blind adaptive diversity-combining scheme based on stochastic gradient techniques is formulated using optimal likelihood ratio testing criterion,and its performance is evaluated in theory and numerical examples,and compared with that of the selection,equal-gain and maximal ratio combining schemes.The proposed method is suitable for real-time implementation and can provide a significant receiver performance and system capacity gain.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2003年第4期510-513,共4页
Acta Electronica Sinica
关键词
CDM
宏分集
多用户检测
盲自适应分布式决策
CDMA
macrodiversity
multiuser detection
blind adaptive distribution detection
