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Method of transmitting and receiving data, system and receiver therefor

  • US 6,522,698 B1
  • Filed: 11/25/1998
  • Issued: 02/18/2003
  • Est. Priority Date: 05/31/1996
  • Status: Expired due to Term
First Claim
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1. A method of transmitting and receiving data, the method comprising the steps of:

  • transmitting a narrow band data signal at an unknown-frequency-within a known range of frequencies;

    receiving the data signal within the known range of frequencies;

    dividing at a receiver the range of frequencies into plural frequency bands each of width less than the uncertainty in the transmission frequency of the data signal;

    detecting the presence of said data signal in at least one of said frequency bands; and

    demodulating the detected data signal, wherein the demodulating step includes the step of centering at least one narrow band filter on the detected signal frequency bands and wherein the time of data signals in the narrow frequency bands is determined in the detection step and used in the demodulation step.

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