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Orthogonal frequency division multiplexing (OFDM) system with channel transfer function prediction

  • US 7,386,072 B2
  • Filed: 04/15/2003
  • Issued: 06/10/2008
  • Est. Priority Date: 04/16/2002
  • Status: Active Grant
First Claim
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1. A method for an adaptive subcarrier loading for a mobile receiver in a wireless communication system based on Orthogonal Frequency Division Multiplexing (OFDM), the method applied to predict a frequency-selective distortion of a second channel transfer function for a multipath propagation channel impaired by attenuation fades and a time-variant behavior when said mobile receiver is moved, the method comprising:

  • estimating a first and second channel transfer functions for a received signal;

    assigning a subcarrier to the mobile receiver based on the estimated first and second channel transfer functions; and

    assigning a modulation scheme to the subcarrier by estimating a subsequent channel transfer function for a subsequent received signal, wherein the estimating the subsequent channel transfer function includes predicting a movement of a plurality of zero points based on the estimated first and second channel transfer functions.

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