Patent ID: 7352779

Claim:
A system comprising: a host; and a plurality of remote units, wherein a plurality of tones is shared among the plurality of remote units in order to communicate with the host using orthogonal frequency division multiplexing, wherein the plurality of tones is shared in a manner that permits at least two of the remote units to transmit to the host at any one time using the plurality of tones; and wherein the host causes at least one remote unit to adjust a timing of symbols transmitted on at least one of the plurality of orthogonal tones in order to improve an alignment of multiframes received at the host; wherein the host: determines a phase shift associated with the receipt at the host of a first symbol transmitted from one of the plurality of remote units; and causes the at least one remote unit to add a delay to the transmission of a second symbol therefrom, wherein the delay is related to the phase shift.