Method for tone hopping in a multipoint-to-point orthogonal frequency division multiplexing communication system

A method for an orthogonal frequency division multiplexing multipoint-to-point communications system, the method comprising:

• receiving an orthogonal frequency division multiplexing waveform at a multipoint-to-point host unit, the orthogonal frequency division multiplexing waveform comprising a plurality of tones transmitted by a plurality of remote units;
• and
• transmitting up to a plurality of tones from a first remote unit of the plurality of remote units, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing;
• adjusting at least one characteristic of the plurality of tones 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 orthogonality of the tones when received at the host unit is improved;
• and
• the plurality of remote units dynamically switching modulation between tones of the plurality of tones to reduce the impact of using any corrupted tones on the upstream information.