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Equalization in orthogonal frequency domain multiplexing

  • US 7,277,493 B2
  • Filed: 01/28/2003
  • Issued: 10/02/2007
  • Est. Priority Date: 01/28/2003
  • Status: Active Grant
First Claim
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1. A method for demodulating a time-domain OFDM signal having a plurality of time-domain OFDM frames, comprising:

  • (a) transforming each time-domain OFDM frame into a frequency domain to recover a plurality of subcarriers;

    (b) determining an amplitude error for each subcarrier, independent of the other subcarriers;

    (c) adjusting the amplitude of each subcarrier based on the determined amplitude error for the subcarrier, independent of the determined amplitude errors for the other subcarriers;

    (d) differentially demodulating the amplitude-adjusted subcarriers to recover DQPSK symbols; and

    (e) adjusting the phase of the DQPSK symbols.

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