arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.02542eess.SPcs.LGcs.MAcs.SYeess.SY
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提高XL-MIMO系统能量效率的天线选择

Antenna Selection for Improving Energy Efficiency in XL-MIMO Systems

Federal University of Technology PR(巴拉那联邦理工大学);State University of Londrina(隆德里纳州立大学);Aalborg University(奥尔堡大学)

José Carlos Marinello, Taufik Abrão, Abolfazl Amiri, Elisabeth de Carvalho, Petar Popovski

摘要:

我们考虑最近提出的超大规模大规模多输入多输出(XL-MIMO)系统,与一些数百个天线服务于较少数量的用户。由于天线阵的长度与到用户的距离具有相同的数量级,因此给定用户的长期衰落系数随基站(BS)处的不同天线而变化。因此,某些天线发射的信号到达用户的功率可能比其他天线发射的功率大得多。从绿色环保的角度来看,同时激活数百甚至数千个天线是无效的,因为有源天线的耗电射频(RF)链显著增加了总能耗。此外,较大数目的所选天线增加了诸如预编码矩阵计算和短期信道估计的线性处理所需的功率。在本文中,我们提出了四个天线选择(AS)的方法部署在XL-MIMO系统,旨在最大限度地提高总的能量效率(EE)。此外,采用一些简化的假设,我们推导出一个封闭形式的解析表达式的EE的XL-MIMO系统,并提出了一个简单的迭代方法来确定的最佳数量的选择天线能够最大化it. The建议的AS计划是完全基于长期衰落参数,因此,选择的天线集仍然有效的一个相对较大的时间/频率间隔。比较结果,我们发现,基于遗传算法的AS方案通常实现最好的EE性能,虽然我们提出的最高归一化接收功率AS方案也实现了非常有前途的EE性能,在一个简单和直接的方式。

英文摘要:

We consider the recently proposed extra-large scale massive multiple-input multiple-output (XL-MIMO) systems, with some hundreds of antennas serving a smaller number of users. Since the array length is of the same order as the distance to the users, the long-term fading coefficients of a given user vary with the different antennas at the base station (BS). Thus, the signal transmitted by some antennas might reach the user with much more power than that transmitted by some others. From a green perspective, it is not effective to simultaneously activate hundreds or even thousands of antennas, since the power-hungry radio frequency (RF) chains of the active antennas increase significantly the total energy consumption. Besides, a larger number of selected antennas increases the power required by linear processing, such as precoding matrix computation, and short-term channel estimation. In this paper, we propose four antenna selection (AS) approaches to be deployed in XL-MIMO systems aiming at maximizing the total energy efficiency (EE). Besides, employing some simplifying assumptions, we derive a closed-form analytical expression for the EE of the XL-MIMO system, and propose a straightforward iterative method to determine the optimal number of selected antennas able to maximize it. The proposed AS schemes are based solely on long-term fading parameters, thus, the selected antennas set remains valid for a relatively large time/frequency intervals. Comparing the results, we find that the genetic-algorithm based AS scheme usually achieves the best EE performance, although our proposed highest normalized received power AS scheme also achieves very promising EE performance in a simple and straightforward way.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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