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

doi:10.13190/jbupt.201002.48.267

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2010, Vol. 33 ›› Issue (2): 48-53.doi: 10.13190/jbupt.201002.48.267

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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

Abstract

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

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

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