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Millimeter wave (mmWave) communication is expected to play an important rolein next generation cellular networks, aiming to cope with the bandwidthshortage affecting conventional wireless carriers. Using side-information hasbeen proposed as a potential approach to accelerate beam selection in mmWavemassive MIMO (m-MIMO) communications. However, in practice, such information isnot error-free, leading to performance degradation. In the multi-user case, awrong beam choice might result in irreducible inter-user interference at thebase station (BS) side. In this paper, we consider location-aided precoderdesign in a mmWave uplink scenario with multiple users (UEs). Assuming theexistence of direct device-to-device (D2D) links, we propose a decentralizedcoordination mechanism for robust fast beam selection. The algorithm allows forimproved treatment of interference at the BS side and in turn leads to greaterspectral efficiencies.

Location-Aided Coordinated Analog Precoding for Uplink Multi-User Millimeter Wave Systems