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Pilot Decontamination for Massive MIMO Network with UAVs

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Document pages: 6 pages

Abstract: This letter studies the pilot contamination (PC) problem for massivemultiple-input multiple-output (MIMO) networks with coexisting terrestrialusers and unmanned aerial vehicles (UAVs). Due to the strong line-of-sight(LoS) air-to-ground channels between UAVs and base stations (BSs), UAVs usuallycause a more severe PC issue as compared to the traditional terrestrial users.To mitigate the PC caused by UAVs, we propose a low-complexity distributedscheme by exploiting the full-dimensional beamforming of massive MIMO BSs andthe angle-dependent LoS channels between them and high-altitude UAVs. Numericalresults show the effectiveness of the proposed pilot decontamination scheme andthe significant signal-to-interference-plus-noise ratio (SINR) gains in boththe uplink and downlink after pilot decontamination.

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