MIMO无线系统多空时发射分集功率分配算法  

Power allocation algorithm of multiple space-time transmit diversity in MIMO wireless systems

作　　者：才科扎西[1] 

机构地区：[1]西北民族大学计算机科学与信息工程学院,兰州730030

出　　处：《计算机应用》2009年第6期1487-1489,1493,共4页journal of Computer Applications

基　　金：国家863计划项目(AA2006010101);教育部科学技术研究重点项目(105172)

摘　　要：针对多输入多输出(MIMO)无线系统多空时发射分集(STTD)技术的符号检测问题,提出了一种有效的功率分配算法。该算法基于QR连续符号检测,在只需要少量反馈信道状态信息(CSI)的前提下对信道矩阵进行QR分解。对R矩阵的属性进行了统计分析,推导了平均误码率(BER)的闭环表达式与上界;通过最小化平均BER上界,给出了最优化的功率分配机制。详细的仿真实验及与现有算法的比较表明,提出算法的性能不仅与理论值完全吻合,而且具有更好的BER性能。Concerning the symbol detection of multiple Space-Time Transmit Diversity （STI＇D） in Multiple-Input Muhiple-Output （MIMO） wireless systems, an efficient power allocation algorithm was presented. Based on the QR-based successive detection, the proposed algorithm required only a few feedbacks Channel Status Information （CSI） from the receiver to decompose QR matrix. The statistical property of the R matrix was approved and the closed-form upper bound for the Bit Error Rate （BER） metric was obtained. By minimizing the upper bound, an optimal power allocation scheme was proposed. Detailed simulation results and comparisons with the existing algorithms prove that, not only the experimental results of the proposed algorithm coincide with the theoretical results completely but also it is of better BER.

关 键 词：功率分配 误码率 空时发射分集 多输入多输出 

分 类 号：TP393.03[自动化与计算机技术—计算机应用技术]