Robust Multi-User Analog Beamforming in mmWave MIMO Systems
Robust Multi-User Analog Beamforming in mmWave MIMO Systems
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DOI：
10.1109/globalsip.2018.8646482
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Lisi Jiang;H. Jafarkhani
中科院分区：
文献类型：
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作者：
Lisi Jiang;H. Jafarkhani
在本文中，我们提出了一个强大的模拟只有波束形成方案的下行链路多用户系统，它不仅抑制干扰，提高波束形成增益，但也提供了对不完美的信道状态信息（CSI）的鲁棒性。我们通过制定一个多目标问题，在平均波束形成增益和用户间干扰之间取得平衡。为了减轻信道估计误差和反馈量化误差的影响，提出了一个泄漏干扰功率的概率目标。为了解决这个问题，我们首先使用加权和法将多目标问题转化为单目标问题。然后，我们使用半定规划技术，使模拟波束形成的恒定幅度的约束，易于处理。仿真结果表明，我们提出的鲁棒波束形成器可以提供高达120%的改善，在和速率相比，波束选择方法。
In this paper, we propose a robust analog-only beamforming scheme for the downlink multi-user systems, which not only suppresses the interference and enhances the beamforming gain, but also provides robustness against imperfect channel state information (CSI). We strike a balance between the average beamforming gain and the inter-user interference by formulating a multi-objective problem. A probabilistic objective of leakage interference power is formulated to alleviate the effects of the channel estimation and feedback quantization errors. To solve the problem, we first use the sum-weighted method to transform the multi-objective problem into a single-objective problem. Then, we use the semi-definite programing technique to make the constant-magnitude constraints of the analog beamforming tractable. Simulation results show that our proposed robust beamformer can provide up to 120% improvement in the sum-rate compared to the beam selection method.