Patent ID: 6594322
Filing Date: 2003-07-15
Classification: G06F,H03M,H04B,H04H,H04J,H04K,H04L,H04M,H04N,H04W,Y02D

Abstract:
A distributed loop method for a multi-point to point communication system, the communication system having a plurality of orthogonal carriers in a first frequency bandwidth for downstream transmission from a head end to a plurality of remote units and a plurality of carriers orthogonal at the head end in a second frequency bandwidth for upstream transmission from the plurality of remote units to the head end, each plurality of orthogonal carriers having at least one control channel associated therewith, the method comprising:detecting symbol timing at the head end of data transmitted upstream from at least one of the remote units; generating at the head end a symbol timing adjustment command based on the detected symbol timing; transmitting the symbol timing adjustment command to the at least one remote unit over the at least one control channel associated with the plurality of orthogonal carriers in the first frequency bandwidth; and adjusting symbol timing at the remote unit as a function of the symbol timing adjustment command.