In this paper, we propose an adaptive perturbation-aided opportunistic hybrid beamforming (AP-OHBF) scheme for temporally correlated millimeter wave (mmWave) channels. The basic idea is that the proposed scheme perturbs the channel parameters to track the channels of the scheduled mobile stations (MSs), whose channels are in favorable conditions, based on only the signal-to-interference-plus-noise ratio (SINR) information of MSs. Specifically, in each time slot, the proposed scheme makes random perturbations to the “best” known channel parameters in the memory, which corresponds to the maximum sum scheduling metric. Then the base station (BS) constructs the channel estimates from these parameters, which are subsequently used to generate the precoders. For data transmission, the BS adopts the successful perturbation, which achieves performance improvements. By contrast, if a perturbation results in performance degradation, it is discarded, whereas the precoders corresponding to the best-known parameters in the memory are instead used for transmission. Simulation results show that in mmWave channels, the proposed AP-OHBF scheme significantly improves the system throughput with respect to the conventional opportunistic beamforming schemes for the same amount of feedback information.

中文翻译：

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用于毫米波系统的自适应扰动辅助机会混合波束成形

在本文中，我们为时间相关的毫米波 (mmWave) 信道提出了一种自适应扰动辅助的机会混合波束成形 (AP-OHBF) 方案。基本思想是，所提出的方案扰动信道参数以仅基于信干噪比 (SINR) 信息来跟踪信道处于有利条件的调度移动台 (MS) 的信道的女士们。具体来说，在每个时隙中，所提出的方案对内存中“最佳”已知信道参数进行随机扰动，这对应于最大和调度度量。然后基站 (BS) 根据这些参数构建信道估计，这些参数随后用于生成预编码器。对于数据传输，BS采用成功扰动，从而实现性能改进。相比之下，如果扰动导致性能下降，则将其丢弃，而将与存储器中最知名参数对应的预编码器用于传输。仿真结果表明，在毫米波信道中，对于相同数量的反馈信息，所提出的 AP-OHBF 方案相对于传统的机会波束成形方案显着提高了系统吞吐量。