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Apparatus and method for synchronizing frequency in orthogonal frequency division multiplexing communication system

  • US 20020145971A1
  • Filed: 11/26/2001
  • Published: 10/10/2002
  • Est. Priority Date: 02/08/2001
  • Status: Active Grant
First Claim
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1. A frequency synchronization apparatus for an orthogonal frequency division multiplexing (OFDM) communication system comprises:

  • a radio frequency (RF) receiving module for receiving OFDM signal;

    an analog/digital (A/D) converter connected to the RF receiving module, the A/D converter converting the OFDM signal into a digital signal;

    a frequency synchronization module connected to the A/D converter, the frequency synchronization module synchronizing carrier frequency;

    a Fast Fourier Transformer (FFT) connected to the frequency synchronization module, the FFT performing fast Fourier transformation to symbols from the frequency synchronization module;

    a channel estimation module connected to the FFT, the channel estimation module estimating carrier channel;

    an equalizer connected to the FFT and the channel estimation module, the equalizer equalizing channel;

    a residual phase tracking module connected to the equalizer, the residual phase tracking module tracking residual phase;

    a demodulator connected to the residual phase tracking module, the demodulator demodulating; and

    a controller connected to the frequency synchronization module, the controller controlling the frequency synchronization module.

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