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An Efficient Pilot Assignment Scheme for Addressing Pilot Contamination in Multicell Massive MIMO Systems

1
Department of Computer and Communication Engineering, Universiti Putra Malaysia, Serdang 43400, Malaysia
2
Wireless and Photonics Networks Laboratory, Universiti Putra Malaysia, Serdang 43400, Malaysia
3
Department of Communication Technology and Network, Universiti Putra Malaysia, Serdang 43400, Malaysia
4
Sports Academy, Universiti Putra Malaysia, Serdang 43400, Malaysia
5
Faculty of Computer Science & Information Technology, University of Malaya, Kuala Lumpur 50603, Malaysia
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(4), 372; https://doi.org/10.3390/electronics8040372
Received: 25 February 2019 / Revised: 17 March 2019 / Accepted: 21 March 2019 / Published: 27 March 2019
(This article belongs to the Special Issue Massive MIMO Systems)
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Abstract

The reuse of the same pilot group across cells to address bandwidth limitations in a network has resulted in pilot contamination. This causes severe inter-cell interference at the targeted cell. Pilot contamination is associated with multicell massive multiple-input multiple-output (MIMO) systems which degrades the system performance even when extra arrays of antennas are added to the network. In this paper, we propose an efficient pilot assignment (EPA) scheme to address this issue by maximizing the minimum uplink rate of the target cell’s users. To achieve this, we exploit the large-scale characteristics of the fading channel to minimize the amount of outgoing inter-cell interference at the target cell. Results from the simulation show that the EPA scheme outperforms both the conventional and the smart pilot assignment (SPA) schemes by reducing the effect of inter-cell interference. These results, show that the EPA scheme has significantly improved the system performance in terms of achievable uplink rate and cumulative distribution function (CDF) for both signal-to-interference-plus-noise ratio (SINR), and uplink rate. View Full-Text
Keywords: pilot contamination; massive MIMO; pilot assignment; large-scale fading coefficients pilot contamination; massive MIMO; pilot assignment; large-scale fading coefficients
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Al-hubaishi, A.S.; Noordin, N.K.; Sali, A.; Subramaniam, S.; Mohammed Mansoor, A. An Efficient Pilot Assignment Scheme for Addressing Pilot Contamination in Multicell Massive MIMO Systems. Electronics 2019, 8, 372.

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