Title :
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
fDate :
12/1/2012 12:00:00 AM
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;
Journal_Title :
Wireless Communications Letters, IEEE
DOI :
10.1109/WCL.2012.080112.120318
