×

FFT window position recovery apparatus and method for OFDM system receiver

  • US 6,798,738 B1
  • Filed: 07/25/2000
  • Issued: 09/28/2004
  • Est. Priority Date: 09/30/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A fast Fourier transform (FFT) window position recovery method in an orthogonal frequency division multiplexing (OFDM) system receiver which receives an OFDM symbol comprised of a useful data interval and a guard interval and recovers an FFT window position, the method comprising:

  • (a) converting a received OFDM signal into a digital complex sample;

    (b) obtaining a power difference between said digital complex sample output of step (a) and a complex sample value delayed by predetermined samples, and detecting a position having a minimum absolute value of the power difference between the samples, as a symbol starting position; and

    (c) activating FFT while moving the FFT window position using the symbol starting position detected by step (b).

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×