MIMO中继正交STBC性能及最优功率分配

doi:10.13190/jbupt.201002.48.267

北京邮电大学学报 ›› 2010, Vol. 33 ›› Issue (2): 48-53.doi: 10.13190/jbupt.201002.48.267

MIMO中继正交STBC性能及最优功率分配

陈书平¹, 王文博¹, 张兴¹, 李秦梓¹, 赵冬²

(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)

收稿日期:2009-05-21 修回日期:2009-09-01 出版日期:2010-04-28 发布日期:2010-04-28
通讯作者: 陈书平
作者简介:陈书平(1982—)，男，博士生， Email: chenshuping@gmail.com；王文博(1965—)，男，教授，博士生导师.
基金资助:
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)

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

CHEN Shu-ping ¹, WANG Wen-bo¹, ZHANG Xing¹, LI Qin-zi ¹, ZHAO Dong²

(1Key Laboratory of Universal Wireless Communications(Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China; 2China Industry Environment, Nokia Siemens Networks(Beijing) Limited Corporation, Beijing 100007, China)

Received:2009-05-21 Revised:2009-09-01 Online:2010-04-28 Published:2010-04-28

摘要/Abstract

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.

关键词: 中继, 调和平均, 中断概率, 符号错误概率, 功率分配

Abstract:

Performance of orthogonal spacetime block codes (OSTBC) in multipleinput multipleoutput (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 closedform expressions to the statistics of the harmonic mean of two independent, nonidentical Chisquare 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.

Key words: relay, harmonic mean, outage probability, symbol error probability, power allocation

陈书平王文博张兴李秦梓赵冬. MIMO中继正交STBC性能及最优功率分配[J]. 北京邮电大学学报, 2010, 33(2): 48-53.

CHEN Shu-ping WANG Wen-bo ZHANG Xing LI Qin-zi ZHAO Dong . Performance and Optimal Power Allocation for Orthogonal STBC in MIMO Relay Channels[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2010, 33(2): 48-53.

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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

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