A bidirectional communication system is provided. The system includes a
first remote unit for communicating with a host unit using orthogonal
frequency division multiplexing. The host unit is communicatively coupled
to a plurality of remote units in a multipoint-to-point configuration.
The first remote unit is configured to transmit up to a plurality of
tones and the first remote unit includes a modulator for modulating the
plurality of tones with upstream information using orthogonal frequency
division multiplexing such that when any tones are transmitted from the
first remote unit and at least one other remote unit of the plurality of
remote units, the tones are substantially orthogonal when received at the
host unit.
