相关瑞利信道下VBLAST-OFDM的子载波分配算法  

Adaptive Subcarrier Allocation Algorithm of VBLAST-OFDM Systems in Correlated Rayleigh Channels

作　　者：李亭升[1] 李城鑫[2] 

机构地区：[1]成都信息工程学院银杏酒店管理学院,四川成都611743 [2]电子科技大学通信与信息工程学院,四川成都611731

出　　处：《哈尔滨理工大学学报》2013年第3期59-63,68,共6页Journal of Harbin University of Science and Technology

摘　　要：针对多用户垂直贝尔实验室分层空时-正交频分复用(VBLAST-OFDM)下行链路,以系统吞吐量最大化为优化目标,给出一种在相关瑞利衰落信道下基于部分信道状态信息(CSI)的子载波分配算法.该算法充分考虑到实际通信系统中CSI的反馈过期和信道的空间相关性对系统性能的影响,分别采用均值反馈的时域相关性模型和克罗内克(Kronecker)模型进行分析,从而得到相应的子载波分配原则.实验结果表明,该算法不仅能有效地反映天线相关矩阵中相关系数以及延时反馈参数对系统吞吐量的影响,且与未利用均值反馈模型的子载波分配相比具有明显的优越性.With the optimization goal of maximizing th gorithm based on partial Channel State Information （CSI） e system throughput, an adaptive subcarrier allocation al- in correlated rayleigh fading channels was proposed for muhiuser Vertical Bell Laboratories Layered Space Time-Orthogonal Frequency Division Multiplexing （VBLAST- OFDM） downlink, In the course of algorithm implementation, the temporal correlation of mean feedback model and Kronecker model were utilized to analyzed, which is the system performance effects of outdated CSI and spatial cor- relation of channels in practical communication systems, then the corresponding subcarrier allocation criteria could be acquired. The experimental results showed that the proposed algorithm not only could effectively reflect system throughput effects of the correlation coefficients of antenna correlation matrix and the parameters of delayed feed- back, but also had better performance as compared with subcarrier allocation without mean feedback model.

关 键 词：垂直贝尔实验室空时分层-正交频分复用 均值反馈模型 子载波分配 相关瑞利信道 信道状态信息 

分 类 号：TN929.5[电子电信—通信与信息系统]