当前位置: X-MOL 学术IEEE Open J. Commun. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Intelligent Surface-Aided Transmitter Architectures for Millimeter-Wave Ultra Massive MIMO Systems
IEEE Open Journal of the Communications Society Pub Date : 2020-12-29 , DOI: 10.1109/ojcoms.2020.3048063
Vahid Jamali , Antonia M. Tulino , Georg Fischer , Ralf R. Muller , Robert Schober

In this article, we study two novel massive multiple-input multiple-output (MIMO) transmitter architectures for millimeter wave (mmWave) communications which comprise few active antennas, each equipped with a dedicated radio frequency (RF) chain, that illuminate a nearby large intelligent reflecting/transmitting surface (IRS/ITS). The IRS (ITS) consists of a large number of low-cost and energy-efficient passive antenna elements which are able to reflect (transmit) a phase-shifted version of the incident electromagnetic field. Similar to lens array (LA) antennas, IRS/ITS-aided antenna architectures are energy efficient due to the almost lossless over-the-air connection between the active antennas and the intelligent surface. However, unlike for LA antennas, for which the number of active antennas has to linearly grow with the number of passive elements (i.e., the lens aperture) due to the non-reconfigurablility (i.e., non-intelligence) of the lens, for IRS/ITS-aided antennas, the reconfigurablility of the IRS/ITS facilitates scaling up the number of radiating passive elements without increasing the number of costly and bulky active antennas. We show that the constraints that the precoders for IRS/ITS-aided antennas have to meet differ from those of conventional MIMO architectures. Taking these constraints into account and exploiting the sparsity of mmWave channels, we design two efficient precoders; one based on maximizing the mutual information and one based on approximating the optimal unconstrained fully digital (FD) precoder via the orthogonal matching pursuit algorithm. Furthermore, we develop a power consumption model for IRS/ITS-aided antennas that takes into account the impacts of the IRS/ITS imperfections, namely the spillover loss, taper loss, aperture loss, and phase shifter loss. Moreover, we study the effect that the various system parameters have on the achievable rate and show that a proper positioning of the active antennas with respect to the IRS/ITS leads to a considerable performance improvement. Our simulation results reveal that unlike conventional MIMO architectures, IRS/ITS-aided antennas are both highly energy efficient and fully scalable in terms of the number of transmitting (passive) antennas. Therefore, IRS/ITS-aided antennas are promising candidates for realizing the potential of mmWave ultra massive MIMO communications in practice.

中文翻译:

毫米波超大规模MIMO系统的智能表面辅助发射机架构

在本文中,我们研究了两种新颖的用于毫米波(mmWave)通信的大规模多输入多输出(MIMO)发射机架构,该架构包含很少的有源天线,每个有源天线都配有专用的射频(RF)链,可以照亮附近的大型智能反射/透射面(IRS / ITS)。IRS(ITS)由大量低成本和高能效的无源天线元件组成,它们能够反射(传输)入射电磁场的相移版本。与透镜阵列(LA)天线类似,由于有源天线和智能表面之间的无线连接几乎无损,因此IRS / ITS辅助天线架构具有高能效。但是,与LA天线不同,对于IRS / ITS辅助天线,由于透镜的不可重配置性(即非智能性),有源天线的数量必须与无源元件(即透镜孔径)的数量线性增长。 IRS / ITS的可重新配置性有助于扩大辐射无源元件的数量,而无需增加昂贵且笨重的有源天线的数量。我们表明,用于IRS / ITS辅助天线的预编码器必须满足的约束与常规MIMO架构的约束不同。考虑到这些限制并利用mmWave信道的稀疏性,我们设计了两个有效的预编码器;一种基于最大化互信息,另一种基于通过正交匹配追踪算法逼近最佳无约束全数字(FD)预编码器。此外,我们开发了IRS / ITS辅助天线的功耗模型,该模型考虑了IRS / ITS缺陷的影响,即溢出损耗,锥度损耗,孔径损耗和移相器损耗。此外,我们研究了各种系统参数对可达到的速率的影响,并表明有源天线相对于IRS / ITS的正确定位可显着提高性能。我们的仿真结果表明,与传统的MIMO架构不同,IRS / ITS辅助天线在发射(无源)天线数量方面既具有高能源效率,又具有完全可扩展性。因此,IRS / ITS辅助天线是实现毫米波潜力的有希望的候选者 即溢出损耗,锥度损耗,孔径损耗和移相器损耗。此外,我们研究了各种系统参数对可达到的速率的影响,并表明有源天线相对于IRS / ITS的正确定位可显着提高性能。我们的仿真结果表明,与传统的MIMO架构不同,IRS / ITS辅助天线在发射(无源)天线数量方面既具有高能源效率,又具有完全可扩展性。因此,IRS / ITS辅助天线是实现毫米波潜力的有希望的候选者 即溢出损耗,锥度损耗,孔径损耗和移相器损耗。此外,我们研究了各种系统参数对可达到的速率的影响,并表明有源天线相对于IRS / ITS的正确定位可显着提高性能。我们的仿真结果表明,与传统的MIMO架构不同,IRS / ITS辅助天线在发射(无源)天线数量方面既具有高能源效率,又具有完全可扩展性。因此,IRS / ITS辅助天线是实现毫米波潜力的有希望的候选者 我们研究了各种系统参数对可达到速率的影响,并显示了有源天线相对于IRS / ITS的正确定位可显着提高性能。我们的仿真结果表明,与传统的MIMO架构不同,IRS / ITS辅助天线在发射(无源)天线数量方面既具有高能源效率,又具有完全可扩展性。因此,IRS / ITS辅助天线是实现毫米波潜力的有希望的候选者 我们研究了各种系统参数对可达到速率的影响,并显示了有源天线相对于IRS / ITS的正确定位可显着提高性能。我们的仿真结果表明,与传统的MIMO架构不同,IRS / ITS辅助天线在发射(无源)天线数量方面既具有高能源效率,又具有完全可扩展性。因此,IRS / ITS辅助天线是实现毫米波潜力的有希望的候选者超大规模 实践中的MIMO通信。
更新日期:2021-01-22
down
wechat
bug