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Coverage Analysis for Millimeter Wave Cellular Networks with Imperfect Beam Alignment

Cheng, M; Wang, JB; Wu, Y; Xia, XG; Wong, KK; Lin, M; (2018) Coverage Analysis for Millimeter Wave Cellular Networks with Imperfect Beam Alignment. IEEE Transactions on Vehicular Technology , 67 (9) 10.1109/TVT.2018.2842213. Green open access

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Abstract

OAPA Millimeter wave (mmWave) communications is a promising approach to satisfy the increasing high data rate requirement of next generation mobile communications. This paper studies the downlink coverage performance of mmWave cellular networks with imperfect beam alignment. An enhanced antenna model is adopted to model the directional antenna beamforming pattern, in which the mainlobe beamwidth and directivity gain can be expressed as functions of the number of elements in the antenna array. After deriving the probability density function of the distance between mobile station (MS) and its serving base station (BS), the directivity gain with imperfect beam alignment is obtained as a discrete random variable. Then, a computationally tractable expression is obtained for the coverage probability of mmWave cellular networks.This generalized expression can be applied in different blockage regimes, e.g. general blockage regime (GBR), full-blockage regime (FBR) and non-blockage regime (NBR) with or without beam alignment errors. Numerical results show that small beam alignment errors will not deteriorate the coverage performance significantly, and the antenna array with the less number of elements provides higher robustness against the beam alignment errors. Moreover, when the beam alignment error is small enough, the coverage performance can be improved by increasing the BS intensity and the number of elements in the antenna array.

Type: Article
Title: Coverage Analysis for Millimeter Wave Cellular Networks with Imperfect Beam Alignment
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TVT.2018.2842213
Publisher version: https://doi.org/10.1109/TVT.2018.2842213
Language: English
Additional information: Copyright © 2018 IEEE. This is an Open Access article published under the IEEE Open Access Publishing Agreement
Keywords: Antenna arrays, Cellular networks, Propagation losses, Array signal processing, Analytical models, Numerical models, Downlink
UCL classification: 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/10051647
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