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

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of mean feedback model and Kronecker model were utilized to analyzed, which is the system performance effects of outdated CSI and spatial cor- relation of channels in practical communication systems, then the corresponding subcarrier allocation criteria could be acquired.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.