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	Low-Complexity Energy-Efficient Subcarrier Assignment in Uplink OFDMA Systems
	Chen, Chen ; Li, Xunan ; Cheng, Xiang ; Yi, Na
	2016
关键词	RESOURCE-ALLOCATION
英文摘要	Subcarrier assignment plays a key role in energy efficient resource allocation for uplink Orthogonal Frequency Division Multiple Access (OFDMA) networks since the optimal power allocation with a given subcarrier assignment can be easily obtained. Existing subcarrier assignment algorithms with acceptable performance need high computational complexity. In this paper, we aim to reduce the complexity as well as improve the energy efficiency (EE) performance. We analyze the inherent relation between EE and the number of subcarriers of a user and then give the closed-form expressions to calculate the EE gain with an additional subcarrier. Based on the closed-form expressions, we propose a low complexity subcarrier assignment algorithm. In this algorithm, we first implement a suboptimal subcarrier assignment and then adjust the assignment in an iterative method to increase the system EE. Simulation results show that the proposed algorithm improves the energy efficiency in a low complexity compared with existing iterative algorithms.; National Natural Science Foundation of China [61471008, 61622101, 61571020]; National 973 Project [2013CB336700]; National 863 Project [SS2015AA011306]; Beijing Municipal Science and Technology Commission [D151100000115004]; CPCI-S(ISTP); 58-63
语种	英语
出处	International Conference on Computing, Networking and Communications (ICNC)
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/470190]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Chen, Chen,Li, Xunan,Cheng, Xiang,et al. Low-Complexity Energy-Efficient Subcarrier Assignment in Uplink OFDMA Systems. 2016-01-01.

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