MIMO中继正交STBC性能及最优功率分配  

Performance and Optimal Power Allocation for Orthogonal STBC in MIMO Relay Channels

作　　者：陈书平[1] 王文博[1] 张兴[1] 李秦梓[1] 赵冬[2] 

机构地区：[1]泛网无线通信教育部重点实验室北京邮电大学,北京100876 [2]诺基亚西门子网络北京有限公司中国产业环境,北京100007

出　　处：《北京邮电大学学报》2010年第2期48-53,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家重点基础研究发展计划项目(2007CB310602);北京邮电大学优秀博士生创新基金项目(CX200903)

摘　　要：理论分析了多入多出(MIMO)中继网络正交空时块码(OSTBC)在衰落信道下的性能,推导出2个独立非同分布的卡方随机变量调和平均值(harmonic mean)统计特性的闭式表达式,在此基础上得出了OSTBC在多天线中继网络中的中断概率和符号错误概率的闭式表达式,通过仿真验证了理论分析的正确性;进一步采用拉格朗日乘子方法得出最优功率分配策略.研究表明,多天线中继网络采用OSTBC可获得满分集增益,提出的最优功率分配策略可进一步优化系统性能.Performance of orthogonal space-time block codes（OSTBC）in multiple-input multiple-output（MIMO）relay networks under fading channels is analyzed.Closed form symbol error probability and outage probability expression for OSTBC in MIMO relay network by deriving and applying some new closed-form expressions to the statistics of the harmonic mean of two independent,non-identical Chi-square distributed random variables are presented and validated by simulations.Furthermore,using the Lagrangian method,the optimal power allocation aiming at minimizing the outage probability is derived.Analysis shows that by adopting OSTBC,MIMO relay network can achieve full diversity gain.And the proposed power allocation scheme can further improve the system performance.

关 键 词：中继 调和平均 中断概率 符号错误概率 功率分配 

分 类 号：TN915[电子电信—通信与信息系统]