Optimal Power Allocation for Amplify-and-Forward Relaying Systems Using Maximum Ratio Transmission at the Source

Jianxiong HUANG  Taiyi ZHANG  Runping YUAN  Jing ZHANG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E94-B   No.6   pp.1774-1777
Publication Date: 2011/06/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.1774
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
amplify-and-forward,  maximum ratio transmission,  outage probability,  average bit error probability,  optimal power allocation,  

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Summary: 
This letter investigates the performance of amplify-and-forward relaying systems using maximum ratio transmission at the source. A closed-form expression for the outage probability and a closed-form lower bound for the average bit error probability of the system are derived. Also, the approximate expressions for the outage probability and average bit error probability in the high signal-to-noise ratio regime are given, based on which the optimal power allocation strategies to minimize the outage probability and average bit error probability are developed. Furthermore, numerical results illustrate that optimizing the allocation of power can improve the system performance, especially in the high signal-to-noise ratio regime.