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Structured non-uniformly spaced rectangular antenna array design for FD-MIMO systems

Structured non-uniformly spaced rectangular antenna array design for FD-MIMO systems
Structured non-uniformly spaced rectangular antenna array design for FD-MIMO systems
Full-dimensional multiple-input multiple-output (FD-MIMO) systems, whereby each base station is equipped with a uniformly spaced rectangular antenna array (URA), provides a practical means of realizing massive MIMO systems. However, the spectral efficiency of URA is considerably lower than that of its uniformly spaced linear array counterpart having the same number of antenna elements. In this paper, we first introduce a discrete angular resolution metric for quantifying the low resolution of URA in the antenna-elevation domain. This motivates us to propose a novel antenna device design, referred to as the structured non-uniformly spaced rectangular array (NURA), in which the antenna elements are non-uniformly distributed in the elevation-angle domain. Specifically, we conceive a structured NURA device for which the nonuniform distribution of the elevation-domain antenna elements is controlled by a single parameter. The design of the optimally structured NURA for the given nonlinear antenna-element-positioning function then becomes a single parameter optimization, namely, that of maximizing the spectral efficiency of the FD-MIMO system, which can be solved efficiently. Our simulation results demonstrate that our structured NURA design significantly outperforms the standard URA in terms of achievable spectral efficiency. Our proposed structured NURA design therefore offers an effective practical framework for enhancing the achievable performance of FD-MIMO systems.
3252-3266
Liu, Wendong
4ddec520-1100-4ac2-acc6-0b82144f6f2c
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Sun, Chen
b6d643db-ef74-4e34-aaae-c8cfd939c1fe
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Liu, Wendong
4ddec520-1100-4ac2-acc6-0b82144f6f2c
Wang, Zhaocheng
70339538-3970-4094-bcfc-1b5111dfd8b4
Sun, Chen
b6d643db-ef74-4e34-aaae-c8cfd939c1fe
Chen, Sheng
9310a111-f79a-48b8-98c7-383ca93cbb80
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Liu, Wendong, Wang, Zhaocheng, Sun, Chen, Chen, Sheng and Hanzo, Lajos (2017) Structured non-uniformly spaced rectangular antenna array design for FD-MIMO systems. IEEE Transactions on Wireless Communications, 16 (5), 3252-3266. (doi:10.1109/TWC.2017.2678998).

Record type: Article

Abstract

Full-dimensional multiple-input multiple-output (FD-MIMO) systems, whereby each base station is equipped with a uniformly spaced rectangular antenna array (URA), provides a practical means of realizing massive MIMO systems. However, the spectral efficiency of URA is considerably lower than that of its uniformly spaced linear array counterpart having the same number of antenna elements. In this paper, we first introduce a discrete angular resolution metric for quantifying the low resolution of URA in the antenna-elevation domain. This motivates us to propose a novel antenna device design, referred to as the structured non-uniformly spaced rectangular array (NURA), in which the antenna elements are non-uniformly distributed in the elevation-angle domain. Specifically, we conceive a structured NURA device for which the nonuniform distribution of the elevation-domain antenna elements is controlled by a single parameter. The design of the optimally structured NURA for the given nonlinear antenna-element-positioning function then becomes a single parameter optimization, namely, that of maximizing the spectral efficiency of the FD-MIMO system, which can be solved efficiently. Our simulation results demonstrate that our structured NURA design significantly outperforms the standard URA in terms of achievable spectral efficiency. Our proposed structured NURA design therefore offers an effective practical framework for enhancing the achievable performance of FD-MIMO systems.

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Accepted/In Press date: 2 March 2017
Published date: 8 May 2017
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 411768
URI: http://eprints.soton.ac.uk/id/eprint/411768
PURE UUID: aebbdef3-5694-48cb-b9d4-729a9eb85420
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 23 Jun 2017 16:31
Last modified: 07 Oct 2020 01:33

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