期刊
IEEE TRANSACTIONS ON COMMUNICATIONS
卷 65, 期 9, 页码 3794-3809出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2017.2715170
关键词
Massive MIMO relay; hybrid processing; spectral efficiency (SE); energy efficiency (EE); limited RF chain
资金
- 973 program [2013CB329204]
- NSFC [61471114]
- Six Talent Peaks project in Jiangsu Province [GDZB-005]
- Open Research Fund of the State Key Lab of ISN [ISN18-03]
- NSFC for Distinguished Young Scholars of China [61625106]
- NSERC of Canada [261524]
We consider a multi-pair massive multiple-input multiple-output relay network, where the relay is equipped with a large number, N, of antennas, but driven by a far smaller number, L, of radio-frequency (RF) chains. We assume that K pairs of users are scheduled for simultaneous transmission, where K satisfies 2K = L. A hybrid signal processing scheme is presented for both uplink and downlink transmissions of the network. Analytical expressions of both spectral efficiency (SE) and energy efficiency (EE) are derived with respect to the RF chain number under imperfect channel estimation. It is revealed that, under the condition N > [4L2/p ], the transmit power of each user and the relay can be, respectively, scaled down by1 root Nand 2K root N if pilot power scales with signal power, or they can be, respectively, scaled down by 1/N and 2K/N if the pilot power is kept fixed, while maintaining an asymptotically unchanged SE. While regarding EE of the network, the optimal EE is shown to be achieved when P-r = 2K Ps, where Pr and Ps, respectively, refer to the transmit power of the relay and each source terminal. We show that the network EE is a quasi-concave function with respect to the number of RF-chains which, therefore, admits a unique globally optimal choice of the RF-chain number. Numerical simulations are conducted to verify our observations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据