Optimal energy-efficient power allocation in OFDMA system

被引：0
|
作者：
Wu, Fan [1 ]
Mao, Yu-Ming [1 ]
Huang, Xiao-Yan [1 ]
Leng, Su-Peng [1 ]
机构：
[1] School of Communication and Information Engineering, University of Electronic Science and Technology of China
来源：
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | 2014年 / 36卷 / 07期
关键词：
Energy Efficiency (EE); Energy-efficient water-filling structure; KKT necessary and sufficient condition; Power allocation; Strict pseudo-concavity; Wireless communication;
D O I：
10.3724/SP.J.1146.2013.01291
中图分类号：
学科分类号：
摘要：
This paper focuses on the energy-efficient power allocation in OFDMA systems. Different from the existing work, this paper proves that the optimal energy-efficient power allocation must have a special water-filling structure, named energy-efficient water-filling structure, by exploiting the strict pseudo-concavity of the energy efficiency function with respect to the power vector. Applying the energy-efficient water-filling structure, the original issue is simplified to a single-variable issue, and the closed-form optimal solution is further obtained. Based on the theoretical analysis, an optimal energy-efficient power allocation algorithm is proposed, where the optimal solution is achieved by sequentially searching within a finite number of water-level intervals. The simulation results demonstrate that the proposed algorithm achieves the optimal solution with significantly lower computational complexity compared with the conventional iterative methods.
引用
收藏
页码：1673 / 1679
页数：6
相关论文
共 15 条
  • [1] Li G.Y., Xu Z., Xiong C., Et al., Energy-efficient wireless communications: Tutorial, survey, and open issues, IEEE Wireless Communications, 18, 6, pp. 28-35, (2011)
  • [2] Xiao X., Tao X., Lu J., QoS-aware energy-efficient radio resource scheduling in multi-user OFDMA systems, IEEE Communications Letter, 17, 1, pp. 75-78, (2013)
  • [3] Feng D., Jiang C., Lim G., Et al., A survey of energy-efficient wireless communications, IEEE Communications Surveys & Tutorials, 15, 1, pp. 167-178, (2013)
  • [4] Chen Y., Zhang S., Xu S., Et al., Fundamental trade-offs on green wireless networks, IEEE Communications Magazine, 49, 6, pp. 30-37, (2011)
  • [5] Heliot F., Imran M., Tafazolli R., Low-complexity energy efficient resource allocation for the downlink of cellular systems, IEEE Transactions on Communications, 61, 6, pp. 2271-2281, (2013)
  • [6] Sadr S., Anpalagan A., Raahemifar K., Radio resource allocation algorithms for the downlink of multiuser OFDM communication systems, IEEE Communications Surveys & Tutorials, 11, 3, pp. 92-106, (2009)
  • [7] Jang J., Lee K.B., Transmit power adaptation for multiuser OFDM systems, IEEE Journal on Selected Areas in Communications, 21, 3, pp. 171-178, (2003)
  • [8] Wong C.Y., Cheng R.S., Letaief K.B., Et al., Multiuser OFDM with adaptive subcarrier, bit, and power allocation, IEEE Journal on Selected Areas in Communications, 17, 10, pp. 1747-1758, (1999)
  • [9] Miao G.-W., Himayat N., Li G.Y., Energy-efficient link adaptation in frequency-selective channels, IEEE Transactions on Communications, 58, 2, pp. 545-554, (2010)
  • [10] Xiong C., Li G.Y., Zhang S., Et al., Energy-efficient resource allocation in OFDMA networks, IEEE Transactions on Communications, 60, 12, pp. 3767-3778, (2012)
12