Power Allocation and Relay Location Selection for Rayleigh Two-Way Relay Channel

doi:10.13190/jbupt.201202.94.liy

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2012, Vol. 35 ›› Issue (2): 94-98.doi: 10.13190/jbupt.201202.94.liy

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Power Allocation and Relay Location Selection for Rayleigh Two-Way Relay Channel

LI Yong,ZHANG Xiang,PENG Mu-gen,WANG Wen-bo

Key Laboratory of Universal Wireless Communications (Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China

Received:2011-06-02 Revised:2011-07-28 Online:2012-04-28 Published:2012-01-05
Contact: Yong LI E-mail:buptliyong@gmail.com
Supported by:
;Chinese Universities Scientific Fund

Abstract

Abstract:

In Rayleigh two-way relay channel, the power allocation problem aiming at minimizing the outage probability for bidirectional communication is investigated under the total power budget constraint. The closed-form solution for the optimal power allocation is developed. It shows that the optimal power allocation scheme always allocates half of the total power for the relay node. Furthermore, the best location for relay node is discussed. It indicates that the best relay location is at the right middle of the two end nodes. It is shown that two-way relay transmission with the optimal power allocation is superior to direct transmission in terms of outage probability.

Key words: network coding, two-way relay, outage probability, power allocation

CLC Number:

TN911.2

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Power Allocation and Relay Location Selection for Rayleigh Two-Way Relay Channel

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