Energy Efficiency for Underlay Cognitive Multiuser Two-Way Relay Networks

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• 作者：Quanzhong Li ; Fengzheng Liu ; Xiang Zhou ; Yihang Yin…
• 关键词：Cognitive radio ; Energy efficiency (EE) ; Two ; way relay ; Multiuser ; Power allocation ; Beamforming
• 刊名：Wireless Personal Communications
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：86
• 期：3
• 页码：1541-1555
• 全文大小：752 KB
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• 作者单位：Quanzhong Li (1) (2)
  Fengzheng Liu (1)
  Xiang Zhou (1)
  Yihang Yin (1)
  Jiayin Qin (3)
  
  1. School of Data Science and Computer, Sun Yat-Sen University, Guangzhou, 510006, Guangdong, China
  2. Collaborative Innovation Center of High Performance Computing, National University of Defense Technology, Changsha, Hunan, China
  3. School of Information Science and Technology, Sun Yat-Sen University, Guangzhou, 510006, Guangdong, China
  
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  Signal,Image and Speech Processing
  Processor Architectures
  
• 出版者：Springer Netherlands
• ISSN：1572-834X

文摘

In this paper, we investigate the energy efficiency maximization (EEM) problem for underlay cognitive multiuser two-way relay networks, by jointly optimizing the power allocation of secondary users and the beamforming matrix of the cognitive relay. The EEM problem is highly non-convex and thus the global optimum is intractable. We first show that the EEM problem can be equivalently transformed to a difference of convex program. Then an efficient iterative algorithm based on the constrained concave convex procedure is proposed to obtain a local optimum of the EEM problem. Simulation results are presented to demonstrate that our proposed solution performs much better than existing schemes even when the iterative number is very small.