×

SYSTEMS AND METHOD FOR ORTHOGONAL FREQUENCY DIVISIONAL MULTIPLEXING

  • US 20090225818A1
  • Filed: 10/29/2007
  • Published: 09/10/2009
  • Est. Priority Date: 02/06/1995
  • Status: Active Grant
First Claim
Patent Images

1. A multi-carrier communication system, the system comprising:

  • a first remote unit comprising;

    a first receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output;

    a first transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;

    a first processor coupled to the first transmitter, wherein the first processor outputs data for transmission by the first transmitter, wherein the first processor applies an inverse Fourier transform algorithm to the data transmitted by the first transmitter;

    the first processor coupled to the first receiver, wherein the first processor applies a Fourier transform algorithm to the receiver output of the first receiver; and

    a first controller programmed to instruct the first transmitter to transmit at least one symbol representing a request for bandwidth allocation on a first carrier of the plurality of spectrally overlapping carrier signals;

    a second remote unit comprising;

    a second receiver configured to de-modulate symbols from at least one of a plurality of spectrally overlapping carrier signals to produce a receiver output;

    a second transmitter configured to modulate symbols onto at least one of a plurality of the spectrally overlapping carrier signals;

    a second processor coupled to the second transmitter, wherein the second processor outputs data for transmission by the second transmitter, wherein the second processor applies an inverse Fourier transform algorithm to the data transmitted by the second transmitter;

    the second processor coupled to the second receiver, wherein the second processor applies a Fourier transform algorithm to the receiver output of the second receiver; and

    a second controller programmed to instruct the second transmitter to transmit at least one symbol representing a request for bandwidth allocation on the first carrier of the plurality of spectrally overlapping carrier signals;

    wherein the second controller is further programmed to determine when a collision has occurred on the first carrier of the plurality of spectrally overlapping carrier signals between transmissions from the first remote unit and transmission from the second remote unit.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×