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MIMO中继正交STBC性能及最优功率分配

DOI: 10.13190/jbupt.201002.48.267, PP. 48-53

Keywords: 中继,调和平均,中断概率,符号错误概率,功率分配

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Abstract:

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(harmonicmean)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.

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