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SYSTEM AND METHOD FOR RANGING AND ROUND TRIP DELAY ADJUSTMENT IN A MULTIPOINT-TO-POINT ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM

  • US 20080025201A1
  • Filed: 10/23/2007
  • Published: 01/31/2008
  • Est. Priority Date: 02/06/1995
  • Status: Abandoned Application
First Claim
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1. A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system comprising:

  • a host unit;

    a plurality of remote units that access the host unit using an orthogonal frequency division multiple access scheme;

    wherein each of the remote units modulates upstream information into an OFDM signal modulated using an inverse Fourier transform;

    wherein the host unit receives upstream OFDM signals from a plurality of the remote units, wherein portions of the upstream OFDM signals arrive at the host unit at the same time;

    wherein the host unit detects a round trip delay between the host unit and each remote unit; and

    wherein the host unit transmits at least one timing adjustment signal to at least one of the remote units based at least in part on at least one of the detected round trip delays.

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