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A Pilot-Based Beam-Tracking Technique for OFDM-Based Millimeter-Wave Cellular Systems

A pilot-based beam-tracking technique is proposed for OFDM-based millimeter-wave cellular systems. In order to track the variations in the angle of departure (AoD) and angle of arrival (AoA), an antenna array is configured into two different subarrays which allow us to estimate AoD/AoA based on the phase difference between the two subarrays in the received signals. A pilot sequence is designed such that it can distinguish between different subarrays and track a beam for a mobile station in multi-cell multi-user environments.