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Adaptive Two-Sided Beam Alignment in mmWave via Posterior Matching

Millimeter wave band communication is an enabler technology for multi Gbps data rates, though with associated technical challenges. Among them are the very high pathloss and the crucial importance of smart signal processing to overcome it. This paper addresses the problem of identifying the location of the strongest scatterers of the channel in the angle domain. The base station in our system operates agnostically with respect to the users, who estimate the strongest path locally and communicate it back just at the end of the process, resulting in a scalable system. The users decide adaptively the directions to test based on a posterior matching approach. Numerical results confirm the validity of our scheme, especially when the time available for beam alignment is limited.