Energy-Efficient Power Allocation for Fixed-Gain Amplify-and-Forward Relay Networks with Partial Channel State Information

Ammar Zafar, Mohamed-Slim Alouini, Yunfei Chen, Redha Mahmoud Mesleh Radaydeh

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this letter, energy-efficient transmission and power allocation for fixed-gain amplify-and-forward relay networks with partial channel state information (CSI) are studied. In the energy-efficiency problem, the total power consumed is minimized while keeping the signal-to-noise-ratio (SNR) above a certain threshold. In the dual problem of power allocation, the end-to-end SNR is maximized under individual and global power constraints. Closed-form expressions for the optimal source and relay powers and the Lagrangian multiplier are obtained. Numerical results show that the optimal power allocation with partial CSI provides comparable performance as optimal power allocation with full CSI at low SNR. © 2012 IEEE.
Original languageEnglish (US)
Pages (from-to)553-556
Number of pages4
JournalIEEE Wireless Communications Letters
Volume1
Issue number6
DOIs
StatePublished - Aug 6 2012

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