Comment by bigfatkitten

This has been a solved problem in the land mobile radio world for a number of decades.

You have a bunch base stations forming a logical channel with a single uplink frequency, and either a single downlink frequency on which every base station is precisely synchronised in frequency and time (simulcast), or multiple downlink frequencies (a multicast system).

A comparator selects, or votes, the highest quality signal from the base receivers based on either lowest noise or lowest BER, and then repeats that through all of the base transmitters simultaneously.

At the same time, in a multicast system, the mobile scans for and selects the base transmitter with either the highest RSSI or lowest BER.