CHANNEL ESTIMATION IN OFDM RECEIVERS
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United States of America Patent
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Issued Date -
Mar 25, 2010
app pub date -
Sep 22, 2008
filing date -
Sep 22, 2008
priority date (Note) -
Abandoned
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Abstract
An OFDM receiver includes a fast Fourier transform processor that receives signal samples and outputs frequency domain samples corresponding to a received symbol. A delay element receives sets of frequency domain samples outputs each of the sets of frequency domain samples following a predetermined delay interval. A frequency domain channel estimator receives frequency domain samples and derives channel estimates from each of the sets of frequency domain samples. A channel estimate queue stores a sequence of channel estimates provided by the channel estimator and provides the sequence to a weighted averaging element that outputs an averaged channel estimate. A frequency equalizer outputs an equalized set of frequency domain samples responsive to the delayed set of frequency domain samples and to the averaged channel estimate.
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