AF中继下行链路系统的能效资源分配方案

doi:10.3969/j.issn.1000-436x.2014.09.012

Abstract

Abstract:

In order to maximize the total energy efficiency of amplify-and-forward relay downlink system,a joint scheme of relay selection and power allocation was proposed with the circuit power of the system.For reducing the computa-tional complexity,a step-by-step suboptimal allocation scheme was provided.Firstly,the virtual direct channel gains were adopted to select appropriate transmission link.Meanwhile,relay system was converted to the single hop system.Then,the power allocation could be solved by convex optimization.Besides,in order to accommodate different user distribu-tions,a resource allocation scheme based on cell zooming was also proposed.Simulations demonstrated that the solution of the proposed suboptimal scheme approaches the optimal solution.Additionally,the scheme with cell zooming is adaptable to different user distributions and further improves the total system energy efficiency.

Key words: resource allocation, cell zooming, AF relay, energy efficiency

Yu CHEN,Xu-ming FANG,Bo HUANG. Energy efficient resource allocation scheme for AF relay downlink system[J]. Journal on Communications, 2014, 35(9): 122-132.

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参数	参数值	参数	参数值
BS间距离	1 000 m	BS-RS链路信道损失	802.16j EVM Type D
载波频率	2.5 GHz	BS / RS的天线高度	32 m
系统带宽	10 MHz	MS的天线高度	1.5 m
BS-RS /RS-MS链路对数正态阴影衰落	3.4/8 dB	热噪声密度	?174 dBm·Hz^-1
载波数	200	功放效率η_B/η_R	0.5/0.3
FFT采样点数	1 024	BS发射状态的电路功耗P^B_ct	100 W
最大功率限制	78 W	RS各个状态的电路功耗P^R_ct/P^R_cr/P^R_cr	50 W/30 W/5 W
RS-MS链路信道损失	Baseline test scenario	MS接收状态的电路功耗	1W

Energy efficient resource allocation scheme for AF relay downlink system

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