Robust Beamforming for Nonorthogonal Multiple-Access Systems in MISO Channels
Robust Beamforming for Nonorthogonal Multiple-Access Systems in MISO Channels
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DOI：
10.1109/tvt.2016.2547998
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发表时间：
2016-12-01
影响因子：
6.8
通讯作者：
Qin, Jiayin
中科院分区：
文献类型：
--
作者：
Zhang, Qi;Li, Quanzhong;Qin, Jiayin
非正交多址（NOMA）是未来移动通信系统中一项有前途的技术。在本文中，考虑到基站知道不完善的信道状态信息（CSI），我们研究了多输入单输出（MISO）信道中NOMA系统的鲁棒波束成形设计问题。通过最坏情况模型对信道不确定性进行建模，我们的目标是在基站发射功率约束的情况下最大化最坏情况可实现的总速率。我们建议将非凸优化问题解耦为四个优化问题，并采用交替优化算法来解决该问题。仿真结果表明，我们提出的鲁棒波束形成方案优于正交多址方案。
Nonorthogonal multiple access (NOMA) is a promising technology in future mobile communication systems. In this paper, considering that the base station knows imperfect channel state information (CSI), we investigate the robust beamforming design problem for NOMA systems in multiple-input-single-output (MISO) channels. Modeling channel uncertainties by the worst-case model, we aim at maximizing the worst-case achievable sum rate subject to the transmit power constraint at the base station. We propose to decouple the nonconvex optimization problem into four optimization problems and employ an alternating optimization algorithm to solve the problem. Simulation results demonstrate that our proposed robust beamforming scheme outperforms the orthogonal multiple-access scheme.