Power allocation scheme for channel capacity maximization in multi-relay amplify-and-forward cooperative system

doi:10.12733/jics20105383

CORC > 兰州理工大学 > 兰州理工大学 > 理学院

	Power allocation scheme for channel capacity maximization in multi-relay amplify-and-forward cooperative system
	Li, Suoping 1; Zou, Xuewei 2; Yan, Lifu 2
刊名	Journal of Information and Computational Science
	2015-03-01
卷号	12 期号:4 页码:1365-1372
关键词	Beamforming Lagrange multipliers Learning algorithms Amplify and forward Analysis and simulation Binary search algorithm Communication schemes Equal power allocation Lagrange functions Power allocation ratios Power allocations
ISSN号	15487741
DOI	10.12733/jics20105383
英文摘要	This paper considers the power allocation problem for multi-relay amplify-and-forward cooperative system. Under the condition of the total power constraint, the power allocation scheme to maximize the channel capacity is proposed. We get a non-closed-form solution of this scheme by constructing a Lagrange function and making use of KKT conditions, and its numerical solution also was obtained based on binary search algorithm. Theoretical analysis and simulations show that the proposed scheme greatly can improve the system performance than the traditional equal power allocation scheme in Rayleigh channel, and that the system with multi-relay has more capacity than the system with only a direct link. We also discuss how the system's total power, the number or the position of relay and the power allocation ratio affect the system's channel capacity. Numerical results show that there always exits the optimal number and position of relays, and power allocation ratio to maximize the channel capacity for a certain communication scheme. But when the relay's number reaches to a certain constant, adding relays will only result in the configuration complexity without bringing more gain for the system. ©, 2015, Binary Information Press
语种	英语
出版者	Binary Information Press
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112417]
专题	理学院
作者单位	1.School of Science, Lanzhou University of Technology, Lanzhou, China; 2.School of Computer and Communication, Lanzhou University of Technology, Lanzhou, China
推荐引用方式 GB/T 7714	Li, Suoping,Zou, Xuewei,Yan, Lifu. Power allocation scheme for channel capacity maximization in multi-relay amplify-and-forward cooperative system[J]. Journal of Information and Computational Science,2015,12(4):1365-1372.
APA	Li, Suoping,Zou, Xuewei,&Yan, Lifu.(2015).Power allocation scheme for channel capacity maximization in multi-relay amplify-and-forward cooperative system.Journal of Information and Computational Science,12(4),1365-1372.
MLA	Li, Suoping,et al."Power allocation scheme for channel capacity maximization in multi-relay amplify-and-forward cooperative system".Journal of Information and Computational Science 12.4(2015):1365-1372.