Frequency division multiplexing system with selectable rate

  • US 6,992,972 B2
  • Filed: 04/09/2003
  • Issued: 01/31/2006
  • Est. Priority Date: 01/06/1998
  • Status: Expired due to Term
First Claim
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1. A receiver for receiving an orthogonal frequency division multiplex (OFDM) communications signal, the ODFM signal being transmitted using a set of sub-carriers which are orthogonal over a time T, the receiver comprising:

  • an analog-to-digital converter; and

    a fast Fourier transform (FFT) block operably coupled to the analog-to-digital converter;

    the receiver being configured to operate in one of a plurality of signaling modes in each of which the duration of a received symbol is KT where K is a positive integer and ones of the plurality of signaling modes have different values of K, but the same set of sub-carriers;

    wherein a guard time is associated with the received signal, the length of the guard time being greater for signaling modes having a greater value of K.

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