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Method and apparatus for multicarrier channel estimation and synchronization using pilot sequences

  • US 7,139,320 B1
  • Filed: 10/11/2001
  • Issued: 11/21/2006
  • Est. Priority Date: 10/11/2001
  • Status: Active Grant
First Claim
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1. A multicarrier signal receiver for receiving a serial signal sequence of modulated subcarriers carrying information for input pilot and data symbols, comprising:

  • a subcarrier-to-symbol converter for converting said serial signal sequence into received pilot and data symbols representative of said input pilot and data symbols;

    an inverse Fourier transformer for selecting said received pilot symbols from said received pilot and data symbols and then inverse Fourier transforming said received pilot symbols into received pilot multicarrier blocksa pilot multicarrier generator for generating a computed pilot multicarrier block having complex conjugates of system pilot symbols corresponding to said input pilot symbols;

    a correlator for correlating said received pilot multicarrier blocks with said computed pilot multicarrier block for providing a correlation function;

    a frequency offset estimator using said correlation function for providing a frequency synchronization adjustment; and

    a signal source for providing a reference signal having a frequency responsive to said frequency synchronization adjustment;

    wherein;

    the subcarrier-to-symbol converter uses said reference signal for frequency synchronizing to said serial signal sequence and providing a frequency synchronized serial signal sequence, said received pilot and data symbols derived from said frequency synchronized serial signal sequence.

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