Outage-constrained beamforming for two-tier massive MIMO downlink with pilot reuse

doi:10.1155/2015/840142

CORC > 北京大学 > 信息科学技术学院

	Outage-constrained beamforming for two-tier massive MIMO downlink with pilot reuse
	Xu, Guozhen ; Liu, An ; Jiang, Wei ; Xiang, Haige ; Luo, Wu
刊名	international journal of antennas and propagation
	2015
DOI	10.1155/2015/840142
英文摘要	Massive multiple-input multiple-output (MIMO) systems and small cell networks are both regarded as promising candidates to meet the exponential growth of mobile data traffic for the next generation (5G) wireless communications. Hence, a new kind of multitier networks which combine massive MIMO macro cells with a secondary tier of small cells is proposed to resolve the contradiction of large network coverage and high data rate. In such multitier networks, it is inevitable to allocate nonorthogonal uplink pilot sequences to user equipment (UE) due to the large number of users. We propose a pilot reuse scheme by exploiting the unique architecture of this networks and analyse the special mixed channel state information (CSI) yielded by the pilot reuse scheme. Based on the mixed CSI, we formulate a downlink transmit beamforming problem of minimizing the total power consumption while satisfying the quality of service (QoS) requirements with outage constraints. After decomposing the original problem into simpler subproblems, we provide an efficient algorithm to combine these subproblems and solve them iteratively for generating the beamforming vectors. Monte Carlo simulations show that the average power consumption of the proposed pilot reuse scheme and its associated beamforming algorithm is close to that of the perfect CSI case. ? 2015 Guozhen Xu et al.; SCI(E); EI; 0; ARTICLE; jiangwei@pku.edu.cn; 2015
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/295355]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Xu, Guozhen,Liu, An,Jiang, Wei,et al. Outage-constrained beamforming for two-tier massive MIMO downlink with pilot reuse[J]. international journal of antennas and propagation,2015.
APA	Xu, Guozhen,Liu, An,Jiang, Wei,Xiang, Haige,&Luo, Wu.(2015).Outage-constrained beamforming for two-tier massive MIMO downlink with pilot reuse.international journal of antennas and propagation.
MLA	Xu, Guozhen,et al."Outage-constrained beamforming for two-tier massive MIMO downlink with pilot reuse".international journal of antennas and propagation (2015).