基于信道衰落相关矩阵的自适应多天线技术

为了在满足目标频谱效率和目标误码率前提下减小多天线系统的发送功率,针对采用线性接收机的无编码空间复用系统,提出了一种发送天线选择及速率(调制方式)分配、功率分配准则。该准则利用了信道衰落的空间相关矩阵,以各子码流的误码率为约束条件,对发送功率进行优化。仿真结果表明:该准则相比于目前已有的天线集合及调制方式选择准则有2 dB的信噪比增益。给出了逼近该准则性能的简化算法,该算法在很大范围内能达到穷举搜索的性能。

Adaptive multiple antenna technique based on fading correlation matrix

An uncoded spatial multiplexing(SM) system with linear receiver is considered in this paper.By deriving and optimizing the average bit error rate for each sub-stream when fading correlation is determinate,an antenna selection criterion with rate and power allocation is developed which minimizes the transmit power while satisfying the required spectrum efficiency and average bit error rate.Simulation results show that the proposed criterion outperforms previous antenna and constellation selection method with a 2-dB improvement in signal to noise ratio.A low complexity algorithm without an exhaustive search is then given which results in the same performance as the exhaustive search in most cases.