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Reduced Switching Connectivity for Large Scale Antenna Selection

Garcia-Rodriguez, A; Masouros, C; Rulikowski, P; (2017) Reduced Switching Connectivity for Large Scale Antenna Selection. IEEE Transactions on Communications , 65 (5) pp. 2250-2263. 10.1109/TCOMM.2017.2669030. Green open access

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Abstract

In this paper, we explore reduced-connectivity radio frequency (RF) switching networks for reducing the analog hardware complexity and switching power losses in antenna selection (AS) systems. In particular, we analyze different hardware architectures for implementing the RF switching matrices required in AS designs with a reduced number of RF chains. We explicitly show that fully-flexible switching matrices, which facilitate the selection of any possible subset of antennas and attain the maximum theoretical sum rates of AS, present numerous drawbacks such as the introduction of significant insertion losses, particularly pronounced in massive multiple-input multiple-output (MIMO) systems. Since these disadvantages make fully-flexible switching suboptimal in the energy efficiency sense, we further consider partially-connected switching networks as an alternative switching architecture with reduced hardware complexity, which we characterize in this work. In this context, we also analyze the impact of reduced switching connectivity on the analog hardware and digital signal processing of AS schemes that rely on received signal power information. Overall, the analytical and simulation results shown in this paper demonstrate that partially-connected switching maximizes the energy efficiency of massive MIMO systems for a reduced number of RF chains, while fully-flexible switching offers sub-optimal energy efficiency benefits due to its significant switching power losses.

Type: Article
Title: Reduced Switching Connectivity for Large Scale Antenna Selection
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TCOMM.2017.2669030
Publisher version: http://dx.doi.org/10.1109/TCOMM.2017.2669030
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/.
Keywords: Switches, Radio frequency, MIMO, Antennas, Ports (Computers), Complexity theory, Hardware, Antenna selection, massive MIMO, RF switching matrices, insertion losses, energy efficiency
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1495353
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