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Modulator, demodulator, and transmission system for use in OFDM transmission

  • US 20040008618A1
  • Filed: 07/08/2003
  • Published: 01/15/2004
  • Est. Priority Date: 05/26/1998
  • Status: Active Grant
First Claim
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1. An OFDM demodulator for receiving an OFDM signal generated from a plurality of subcarriers modulated with transmitted data, said OFDM demodulator comprising:

  • a Fast Fourier Transformer (FFT) operable to convert the OFDM signal into a FFT converted signal which comprises data carriers and pilot carriers;

    a pilot carrier detector operable to detect the pilot carriers from the FFT converted signal;

    a phase difference calculator operable to calculate phase differences between each of the detected pilot carriers and each of known pilot carriers;

    a phase change amount calculator operable to calculate, based on the calculated phase differences, an amount of change of phase rotation between each pair of adjacent pilot carriers with respect to a carrier frequency and a sampling frequency; and

    a phase corrector operable to correct a phase of each of the data carriers, based on the calculated phase differences and the amounts of change.

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