Optimal designs of collaborative relay-assisted multiuser beamforming   for cellular systems

doi:10.1002/wcm.2293

CORC > 北京大学 > 信息科学技术学院

	Optimal designs of collaborative relay-assisted multiuser beamforming for cellular systems
	Wang, Da ; Chen, Chen ; Bai, Lin ; He, Jianhua ; Jin, Ye ; Li, Ying
刊名	wireless communications mobile computing
	2014
关键词	collaborative relay beamforming multiuser system semidefinite relaxation technology NETWORKS FEEDBACK
DOI	10.1002/wcm.2293
英文摘要	With careful calculation of signal forwarding weights, relay nodes can be used to work collaboratively to enhance downlink transmission performance by forming a virtual multiple-input multiple-output beamforming system. Although collaborative relay beamforming schemes for single user have been widely investigated for cellular systems in previous literatures, there are few studies on the relay beamforming for multiusers. In this paper, we study the collaborative downlink signal transmission with multiple amplify-and-forward relay nodes for multiusers in cellular systems. We propose two new algorithms to determine the beamforming weights with the same objective of minimizing power consumption of the relay nodes. In the first algorithm, we aim to guarantee the received signal-to-noise ratio at multiusers for the relay beamforming with orthogonal channels. We prove that the solution obtained by a semidefinite relaxation technology is optimal. In the second algorithm, we propose an iterative algorithm that jointly selects the base station antennas and optimizes the relay beamforming weights to reach the target signal-to-interference-and-noise ratio at multiusers with nonorthogonal channels. Numerical results validate our theoretical analysis and demonstrate that the proposed optimal schemes can effectively reduce the relay power consumption compared with several other beamforming approaches. Copyright (c) 2012 John Wiley & Sons, Ltd.; Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications; SCI(E); EI; 0; ARTICLE; l.bai@buaa.edu.cn; 15; 1484-1499; 14
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/152027]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Wang, Da,Chen, Chen,Bai, Lin,et al. Optimal designs of collaborative relay-assisted multiuser beamforming for cellular systems[J]. wireless communications mobile computing,2014.
APA	Wang, Da,Chen, Chen,Bai, Lin,He, Jianhua,Jin, Ye,&Li, Ying.(2014).Optimal designs of collaborative relay-assisted multiuser beamforming for cellular systems.wireless communications mobile computing.
MLA	Wang, Da,et al."Optimal designs of collaborative relay-assisted multiuser beamforming for cellular systems".wireless communications mobile computing (2014).