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

Author

Zafar, Ammar ; Radaydeh, Redha M. ; Chen, Yunfei ; Alouini, Mohamed-Slim

Author_Institution

EE Program, King Abdullah Univ. of Sci. & Technol. (KAUST), Thuwal, Saudi Arabia

Volume

1

Issue

6

fYear

2012

fDate

12/1/2012 12:00:00 AM

Firstpage

553

Lastpage

556

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.

Keywords

amplify and forward communication; channel allocation; cooperative communication; relay networks (telecommunication); CSI; Lagrangian multiplier; closed-form expressions; cooperative communication; end-to-end SNR; energy-efficient power allocation; fixed-gain amplify-and-forward relay networks; partial channel state information; relay power; signal-to-noise-ratio; Amplifiers; Channel state information; Optimization; Power distribution; Resource management; Signal to noise ratio; Wireless communication; Amplify-and-Forward; cooperative communications; energy-efficiency; fixed-gain relays; optimal power allocation;

fLanguage

English

Journal_Title

Wireless Communications Letters, IEEE

Publisher

ieee

ISSN

2162-2337

Type

jour

DOI

10.1109/WCL.2012.080112.120318

Filename

6261329