SYSTEM FOR FOLLOW-UP SYNCHRONIZATION TO MAINTAIN SYNCHRONIZATION THROUGHOUT TRANSMISSION

A bidirectional communication system is provided. In one embodiment, a system comprises a host unit to communicate with a plurality of remote units using orthogonal frequency division multiplexing, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration; the host unit receiving an orthogonal frequency division multiplexing waveform, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by the plurality of remote units; and wherein the host unit is configured to transmit adjustment information to a first remote unit of the plurality of remote units to maintain the plurality of tones transmitted by the plurality of remote units substantially orthogonal as received at the host unit, the information directing the first remote unit to adjust tones transmitted by the first remote unit.