Multiple user access method using OFDM

  • US 5,815,488 A
  • Filed: 09/28/1995
  • Issued: 09/29/1998
  • Est. Priority Date: 09/28/1995
  • Status: Expired due to Term
First Claim
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1. A method for enabling a plurality of remote locations to transmit data to a central location comprising the steps of:

  • at each remote location, coding data to be transmitted by translating each group of one or more bits of said data into a transform coefficient associated with a particular baseband frequency in a particular subset of orthogonal baseband frequencies allocated to the remote location, the particular subset of orthogonal baseband frequencies allocated to each remote location being chosen from a set of orthogonal baseband frequencies, the subsets of baseband frequencies allocated to each remote location being mutually exclusive.at each remote location, using an electronic processor, performing an inverse orthogonal transformation on said transform coefficients to obtain a block of time domain data;

    at each remote location, utilizing a modulator to modulate said block of time domain data onto a carrier signal for transmission to said central location, said carrier signal having the same carrier frequency for each remote location;

    receiving at said central location from one or more of said remote locations, one or more blocks of time domain data modulated on one or more of said carrier signals;

    using a demodulator, demodulating said one or more blocks of time domain data from the carrier frequency signal.performing said orthogonal transformation on said demodulated time domain data to reconstruct said transform coefficients, andtranslating said transform coefficients into said data to be translated from each remote location.

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