Low Complexity Beamforming and User Selection Schemes for 5G MIMO-NOMA Systems
Low Complexity Beamforming and User Selection Schemes for 5G MIMO-NOMA Systems
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5G MIMO-NOMA 系统的低复杂度波束成形和用户选择方案
DOI:
10.1109/jsac.2017.2727229
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发表时间:
2017-07
影响因子:
16.4
通讯作者:
Jin Ye
中科院分区:
文献类型:
--
作者:
Chen Chen;Cai Wenbo;Cheng Xiang;Yang Liuqing;Jin Ye
This paper investigates the resource allocation (RA) problem for the downlink multiple input multiple output-based non-orthogonal multiple access (MIMO-NOMA) system, which is usually solved through a beamforming (BF) process and a user selection (US) process. In this paper, we propose the multiple-user channel state information (CSI)-based singular value decomposition (MU-CSI-SVD) BF scheme and the minimization of power (Min-Power) US scheme. Under perfect CSI scenarios, the proposed MU-CSI-SVD achieves near optimal sum rate performance with the high-complexity BF scheme while has the same level computational complexity as the low-complexity BF scheme. For imperfect CSI scenarios, the proposed MU-CSI-SVD also achieves better outage probability performance but requires the same level computational complexity as the existing low-complexity BF scheme. Moreover, MU-CSI-SVD is helpful to decrease the computational complexity for solving the Min-Power US problem. Compared with existing US schemes, the proposed Min-Power scheme can achieve larger sum rate or lower outage probability with limited computational complexity increment. Therefore, in this paper, we develop a complete RA scheme for 5G MIMO-NOMA systems, which has excellent performance while with low computational complexity for both perfect and imperfect CSI scenarios.
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DOI:
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发表时间:
2016-12-01
期刊:
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影响因子:
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影响因子:
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