A Power Efficient Pilot Design for Multi-cell Massive MIMO Systems

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Abstract

In this paper, we address the pilot contamination problem in multi-cell Massive MIMO systems. Particularly, we pro- pose a pilot design scheme that simultaneously minimizes the channel estimation errors of all base stations (BSs) and the total pilot power consumption of all users subject to the trans- mit power constraint for every user in the network. We de- compose the proposed non-convex problem into distributed optimization problems to be solved at each BS, assuming the knowledge of pilot signals of the other BSs. Then, we in- troduce a successive optimization approach to cast each dis- tributed optimization problem into a convex linear matrix in- equality form. Simulation results confirm that the proposed approach significantly reduces pilot power while maintaining the same level of channel estimation error as a recent work in [1].
Original languageEnglish
Title of host publicationIEEE Global Conference on Signal and Information Processing (GlobalSIP 2018)
PublisherIEEE
Publication statusAccepted/In press - 10 Sept 2018

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