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

摘要/Abstract

摘要：

为最大化放大转发中继系统的下行链路总能效，结合系统的电路功率，提出了一种基于能效的中继选择和功率分配联合方案。为降低复杂度，采用分步式次优化方案，利用虚拟直传信道增益得到中继选择方法，并将中继系统转换为单跳系统；然后利用凸规划得到最优功率分配。此外，为适应不同的用户分布，提出联合小区呼吸机制的分配方案。仿真结果表明，所提次优联合方案逼近最优值，联合小区呼吸的方案可适应不同的用户分布并进一步提升能效。

关键词: 放大转发中继, 能效, 资源分配, 小区呼吸

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

陈煜,方旭明,黄博. AF中继下行链路系统的能效资源分配方案[J]. 通信学报, 2014, 35(9): 122-132.

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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参考文献 15

[1]	EARTH. EU funded research project FP7-ICT-2009-4-247733-EARTH[EB/OL]. . 2012.
[2]	COREIA M L , ZELLER D , BLUME O , et al. Challenges and enabling technologies for energy aware mobile radio networks[J]. IEEE Communications Magazine, 2010,48(11):66-72.
[3]	AKBARI A , HOSHYAR R . Energy efficient resource allocation in wireless OFDMA system[A]. 21st Annual IEEE International Sympo-sium on Personal,Indoor and Mobile Radio Communication[C]. Istanbul,Turkey, 2010.1731-1735.
[4]	MIAO G , HIMAYAT N , LI G Y . Energy efficient link adaptation in frequency selective channel[J]. IEEE Transaction on Communications, 2010,58(2):545-554.
[5]	MIAO G , HIMAYAT N , LI G Y , et al. Low complexity en-ergy-efficient scheduling for uplink OFDMA[J]. IEEE Transaction on Communications, 2012,60(1):112-120.
[6]	XIONG C , LI G Y , ZHANG S , et al. Energy-efficient resource alloca-tion in OFDMA networks[A]. IEEE Global Communications Cofer-ence (IEEE GLOBECOM)[C]. Houston,Texas,USA. 2011.
[7]	陈煜，方旭明，赵越．基于能效的DF中继OFDM链路自适应功率分配[J]．电子与信息学报， 2013,35(2):285-290. CHEN Y , FANG X M , ZHAO Y . Energy efficient adaptive power al-location in OFDM-based decode-and-forward relay link[J]. Journal of Electronics ＆ Information Technology, 2013,35(2):285-290.
[8]	HO C Y , HUANG C Y ,. Energy efficient subcarrier power allocation power allocation and relay selection scheme for OFDMA based coop-erative relay networks[A]. Proc IEEE International Coference on Communications (IEEE ICC)[C][C]. Kyoto,Japan. 2011.
[9]	JIANG Y , ZHANG J , LI X , et al. Energy-efficient resource optimiza-tion for relay-aided uplink OFDMA systems[A]. IEEE Vehicular Technology Conference (VTC Spring)[C]. Yokohama Japan. 2012.
[10]	ZHOU M , CUI Q , JANTTI R , et al. Energy-efficient relay selection and power allocation for two-way Relay channel with analog network coding[J]. IEEE Communications Letters, 2012,16(6):816-819.
[11]	DEVARAJAN R , JHA C S , PHUYAL U , et al. Energy-aware resource allocation for cooperative cellular network using multi-objective opti-mization approach[J]. IEEE Transaction on Wireless Communications, 2012,11(5):1797-1807.
[12]	NIU Z , WU Y , GONG J , et al. Cell zooming for cost-efficient green cellular networks[J]. IEEE Communications Magazine, 2010,48(11):74-79.
[13]	BADIC B , et al. Energy efficient radio access architectures for green radio: large versus small cell size deployment[A]. IEEE Vehicular Technology Conference (VTC'09 Fall)[C]. Anchorage,Alaska,USA. 2009.
[14]	HASNA M O , ALOUINI M S . End-to–end performance of transmis-sion systems with relays over Rayleigh fading channel[J]. IEEE Transaction on Wireless Communication. 2003,2(6):1126-1131.
[15]	IEEE 802.16 Broadband Wireless Access Working Group. IEEE 80216m-08_004r5.IEEE 802.16m Evaluation Methodology Docu-ment (EMD)[S]. 2009.

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