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System and method for round trip delay adjustment in a multipoint-to-point orthogonal frequency division multiplexing system

  • US 7,408,873 B2
  • Filed: 10/26/2007
  • Issued: 08/05/2008
  • Est. Priority Date: 02/06/1995
  • Status: Expired due to Fees
First Claim
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1. A method for multipoint-to-point communication, the method comprising:

  • receiving at a host a plurality of upstream symbols transmitted from a plurality of remote units;

    wherein the upstream symbols are transmitted on a plurality of orthogonal carriers modulated using an inverse Fourier transform, and wherein the upstream symbols are demodulated for reception using a Fourier transform;

    determining respective round trip path delay values associated with each of at least two of the plurality of remote units;

    wherein determining respective round trip path delay values, determines a round trip path delay value for a remote unit based on a time of reception at the host of a first signal from the remote unit;

    wherein a time of transmission of the first signal from the remote unit is based on a time of reception at the remote unit of a second signal from the host;

    transmitting information to each of the at least two remote units based on the respective round trip path delay values determined for each of the at least two remote units; and

    receiving at the host at least one upstream symbol from each of the at least two remote units at the same time.

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