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arXiv 2009.02616eess.SPcs.SYeess.SY
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非平稳信道下的XL-MIMO能量有效天线选择

XL-MIMO Energy-Efficient Antenna Selection under Non-Stationary Channels

Gabriel Avanzi Ubiali, Taufik Abrão

摘要:

大规模多输入多输出(M-MIMO)是5G网络的关键技术。在该研究领域内,出现了新类型的部署,诸如超大型方案(XL-MIMO),其中基站(BS)处的天线阵列具有极端尺寸。因此,空间非平稳特性出现,因为用户只能看到天线阵列的一部分,这被称为可见区(VR)。在这种具有挑战性的发送-接收场景中,提出了一种算法,该算法选择适当的天线元件来处理上行链路(UL)中给定用户的接收信号,以及在下行链路(DL)期间发送该用户的信号。在BS处不使用所有可用天线元件的优点是计算负担和电路功耗降低,从而显著提高能量效率(EE)。数值结果表明,一个可以增加EE,而不损害显着的频谱效率(SE)。在活跃用户较少的情况下,XL-MIMO系统的性能表明,使用不到20%的阵列天线单元的EE最大化,而不会严重损害SE。

英文摘要:

Massive multiple-input-multiple-output (M-MIMO) is a key technology for 5G networks. Within this research area, new types of deployment are arising, such as the extremely-large regime (XL- MIMO), where the antenna array at the base station (BS) has extreme dimensions. As a consequence, spatial non-stationary properties appear as the users see only a portion of the antenna array, which is called visibility region (VR). In this challenging transmission-reception scenario, an algorithm to select the appropriate antenna-elements for processing the received signal of a given user in the uplink (UL), as well as to transmit the signal of this user during downlink (DL) is proposed. The advantage of not using all the available antenna-elements at the BS is the computational burden and circuit power consumption reduction, improving the energy efficiency (EE) substantially. Numerical results demonstrate that one can increase the EE without compromising considerably the spectral efficiency (SE). Under few active users scenario, the performance of the XL-MIMO system shows that the EE is maximized using less than 20% of the antenna-elements of the array, without compromising the SE severely.

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