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Title: Exploration of User Separation Capabilities by Distributed Large Antenna Arrays
Authors: Chen, Cheng-Ming
Chiumento, Alessandro
Van der Perre, Liesbet
Vandenbosch, Guy
Pollin, Sofie
Volskiy, Vladimir
Issue Date: 8-Dec-2016
Conference: IEEE GLOBECOM 2016 location:Washington, DC USA date:4-8 December 2016
Abstract: In this paper, we present a novel exploration of spatial separation of closely-located users by a massive MIMO system in line-of-sight (LoS) for both an anechoic chamber and an indoor corridor propagation environments. A distributed massive multiple-input multiple-output (DM-MIMO) system powered by software defined radios (SDRs) has been used for the measurement campaign. For the user separation study, we first conduct an analysis with a spherical wave channel model for physically-large rectangular arrays. Preliminary simulation results show that a single antenna array achieves better user separation for users distributed on a line parallel to the array plane rather than when users are distributed on a line normal to the array. An intuitive idea is that, by splitting a collocated antenna array into two subarrays, additional diversity is created if the second sub-array is on a plane orthogonal to the first sub-array. Figures of merit such as the correlation coefficients, condition numbers and sum-rates of both centralized and distributed antenna arrays have been chosen to determine the impact of array split and positioning on user separation. Extensive measurements, performed on two 32-element antenna arrays of a massive MIMO testbed at 2.6GHz, show that an improvement of around 140% can be achieved in a poor scattered environment if distributed arrays are used instead of centralized ones.
Publication status: accepted
KU Leuven publication type: IC-p
Appears in Collections:Technologiecluster ESAT Elektrotechnische Engineering
Electrical Engineering (ESAT) TC, Technology Campuses Ghent and Aalst
ESAT- TELEMIC, Telecommunications and Microwaves

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