Low-Complexity Beam Selection Scheme for High Speed Railway Communications
Low-Complexity Beam Selection Scheme for High Speed Railway Communications
复制标题
高速铁路通信低复杂度波束选择方案
DOI：
10.1109/access.2020.2967065
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发表时间：
2020
期刊：
影响因子：
3.9
通讯作者：
Zhang Li
中科院分区：
文献类型：
--
作者：
Jiang Rui;Zhao Jiaqi;Xu Youyun;Wang Xiaoming;Zhang Li
基于毫米波的大规模多输入多输出（MIMO）辅助波束形成是提高高速铁路通信系统容量和数据传输速率的有效途径。为了减少发射机的数目并提高系统吞吐量，在基站（BS）处使用具有不同波束宽度的多流波束成形作为发射波束。然而，当列车向小区边缘移动时，多个波束之间的波束间模糊（IBA）问题变得越来越严重，如果仍然同时激活多个波束，系统的性能将显著下降。为了克服这一困难，本文提出了一种基于多流波束形成的低复杂度波束选择方案。利用该方法，当列车在BS附近时，所有波束被激活以实现高吞吐量的性能。然而，当列车在小区边缘移动时，由于不可支持的IBA，只有一个波束被激活。根据角度分辨率的要求，可以计算出最佳的光束切换位置。从理论分析和仿真结果来看，该方案可以实现低互补复杂度和高吞吐量性能。
Large-scale multiple input multiple output (MIMO) assisted beamforming based on millimeter waves is an effective way to increase system capacity and data transmission rate for high speed railway (HSR) communication systems. To reduce the number of handovers and improve system throughput, multi-stream beamforming with different beamwidths is used as the transmit beam at the base station (BS). However, when the train moves toward the cell edge, the inter-beam ambiguity (IBA) between multiple beams becomes more and more serious, and the performance of the system will decrease significantly if multiple beams are still activated simultaneously. In order to overcome such difficulty, a low-complexity beam selection scheme based on multi-stream beamforming is proposed in this paper. With this methodology, when the train is in the vicinity of the BS, all beams are activated to achieve the performance of high throughput. Neverthless, when the train moves at the cell edge, only one beam is activated due to the insupportable IBA. The optimal beam switching position could be calculated according to the requirements of the angular resolution. Observing from the theoretical analysis and the simulation results, the proposed scheme can achieve low complementation complexity with high throughput performance.