Cooperative Non-Orthogonal Multiple Access in Multiple-Input-Multiple-Output Channels
Cooperative Non-Orthogonal Multiple Access in Multiple-Input-Multiple-Output Channels
复制标题
多输入多输出通道中的协作非正交多址接入
DOI:
10.1109/twc.2017.2788413
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发表时间:
2018-01
影响因子:
10.4
通讯作者:
Qin Jiayin
中科院分区:
文献类型:
--
作者:
Li Yiqing;Jiang Miao;Zhang Qi;Li Quanzhong;Qin Jiayin
Cooperative non-orthogonal multiple access (NOMA) systems inherit advantages of the NOMA protocol and the cooperative relay. In this paper, we propose cooperative NOMA systems in multiple-input-multiple-output channels. The whole transmission is divided into two phases. In the first phase, the base station broadcasts signals using the NOMA protocol to a central user and a cell-edge user. In the second phase, the central user helps the base station cooperatively relay signals intended for the cell-edge user. Our objective is to maximize achievable rate from the base station to the cell-edge user under transmit power constraints and achievable rate constraint from the base station to the central user. The difficulty of this problem is the joint beamforming of the base station and the central user in the second phase. We propose a constrained convex-concave procedure (CCCP)-based algorithm. To reduce computational complexity, we also propose a closed-form search-based suboptimal algorithm. Simulation results demonstrate that our proposed cooperative NOMA system with CCCP-based algorithm outperforms the conventional NOMA scheme. When achievable rate constraint to the central user is low, our proposed cooperative NOMA system with the closed-form search-based suboptimal algorithm outperforms the NOMA scheme.
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DOI:
10.1109/lcomm.2015.2441064
发表时间:
2015-08-01
期刊:
IEEE COMMUNICATIONS LETTERS
影响因子:
--
作者:
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通讯作者:
Poor, H. Vincent
DOI:
10.1109/twc.2013.031813.120224
发表时间:
2013-05-01
影响因子:
10.4
作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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影响因子:
6.8
作者:
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通讯作者:
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影响因子:
6.8
作者:
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通讯作者:
Qin Jiayin