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Optimum Downlink Beamwidth Estimation in mmWave Communications
IEEE Transactions on Communications ( IF 8.3 ) Pub Date : 2021-01-01 , DOI: 10.1109/tcomm.2020.3025356
Nancy Varshney , Swades De

With increasing density of data-hungry devices per unit area, allocating single highly-directed beam per user in millimeter-wave communications is not practical. Therefore, the requirement is to serve multiple users over a single beam. Considering a single-cell scenario with a fixed number of users, this paper addresses the problem of selection of optimal beamwidth depending on user density and distribution. First, by considering fixed beam service time in each sector, optimal beamwidth is estimated using exhaustive search for average long-run user rate and base station energy efficiency maximization. Based on the results of the average long-run user rate maximization using an exhaustive search, another method of reduced complexity is proposed to find sub-optimal beamwidth. Subsequently, optimum beamwidth is estimated with user density dependent variable time scheduling in a sector, that offers improved performances over fixed time scheduling. An efficient algorithm on variable time scheduling is also provided. Finally, the effect of localization error on optimal beamwidth estimation is investigated. The numerical results show that using the narrowest beam does not necessarily result in achieving a better average long-run user rate. Further, localization error does not affect the selection of optimal beamwidth, however, user Quality-of-Service degrades.

中文翻译:

毫米波通信中的最佳下行链路波束宽度估计

随着单位面积上需要大量数据的设备密度的增加,在毫米波通信中为每个用户分配单个高度定向的波束是不切实际的。因此,要求是在单个波束上为多个用户提供服务。考虑到用户数量固定的单小区场景,本文解决了根据用户密度和分布选择最佳波束宽度的问题。首先,通过考虑每个扇区的固定波束服务时间,使用穷举搜索平均长期用户速率和基站能量效率最大化来估计最佳波束宽度。基于使用穷举搜索的平均长期用户速率最大化的结果,提出了另一种降低复杂性的方法来寻找次优波束宽度。随后,最佳波束宽度是通过扇区中与用户密度相关的可变时间调度来估计的,这提供了比固定时间调度更好的性能。还提供了一种关于可变时间调度的有效算法。最后,研究了定位误差对最优波束宽度估计的影响。数值结果表明,使用最窄的波束并不一定能获得更好的平均长期用户速率。此外,定位误差不会影响最佳波束宽度的选择,但会降低用户的服务质量。数值结果表明,使用最窄波束并不一定能获得更好的平均长期用户率。此外,定位误差不会影响最佳波束宽度的选择,但会降低用户的服务质量。数值结果表明,使用最窄的波束并不一定能获得更好的平均长期用户速率。此外,定位误差不会影响最佳波束宽度的选择,但会降低用户的服务质量。
更新日期:2021-01-01
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