基于LDDMA的多用户分集性能分析  

Performance Analysis for Multi-user Diversity based on LDDMA

作　　者：邓单 

机构地区：[1]京信通信技术(广州)有限公司

出　　处：《现代电信科技》2011年第6期32-36,共5页Modern Science & Technology of Telecommunications

摘　　要：针对线性离散多址复用(LDDMA)系统,文章研究在线性迫零(Zero-Force)接收机条件下的多用户选择分集与调度算法。对于用户子集选择算法,遍历搜索是最优的,但它所引起的繁重的计算复杂度,很难在实际中应用。基于此考虑,本文提出三种次优的贪婪选择准则:最大信道增益选择,最大信道容量选择与最大最小后验SNR选择。数值仿真结果表明:最大最小后验SNR准则可以提供较好的BER性能。For LDDMA systems,a user subset rather than optimal user is selected for simultaneously transmitting on uplink of wireless MIMO networks.Considering the heavy computation burden on exhaust search for optimal user subset,we present three greedy selection criteria： maximum channel gain,maximum capacity and max-min post-SNR,for selecting the suboptimal user subset.In addition,we generalize the scheduling algorithms： one user can be allocated several or no USMs according to its channel fading matrix.Simulations demonstrate that max-min post-SNR algorithm offers the best BER performance when zero-force,coherent receiver is used over a slowly varying channel.

关 键 词：多用户分集 空时编码 线性离散码 多址接入 MIMO 

分 类 号：TN929.5[电子电信—通信与信息系统]