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International Journal of Antennas and Propagation
Volume 2015, Article ID 368463, 10 pages
http://dx.doi.org/10.1155/2015/368463
Research Article

Design of Joint Spatial and Power Domain Multiplexing Scheme for Massive MIMO Systems

Technology Innovation Center, China Telecom Corporation Limited, China Telecom Beijing Information Science and Technology Innovation Park, Southern Zone of Future Science and Technology City, Beiqijia, Changping, Beijing 102209, China

Received 14 August 2015; Accepted 15 October 2015

Academic Editor: Wei Xiang

Copyright © 2015 Zheng Jiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Massive Multiple-Input Multiple-Output (MIMO) is one of the key techniques in 5th generation wireless systems (5G) due to its potential ability to improve spectral efficiency. Most of the existing works on massive MIMO only consider Time Division Duplex (TDD) operation that relies on channel reciprocity between uplink and downlink channels. For Frequency Division Duplex (FDD) systems, with continued efforts, some downlink multiuser MIMO scheme was recently proposed in order to enable “massive MIMO” gains and simplified system operations with limited number of radio frequency (RF) chains in FDD system. However these schemes, such as Joint Spatial Division and Multiplexing (JSDM) scheme and hybrid precoding scheme, only focus on multiuser transmission in spatial domain. Different from most of the existing works, this paper proposes Joint Spatial and Power Multiplexing (JSPM) scheme in FDD systems. It extends existing FDD schemes from spatial division and multiplexing to joint spatial and power domain to achieve more multiplexing gain. The user grouping and scheduling scheme of JSPM is studied and the asymptotic expression for the sum capacity is derived as well. Finally, simulations are conducted to illustrate the effectiveness of the proposed scheme.