Least squares channel identification for OFDM Systems
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United States of America Patent
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Sep 12, 2017
Grant Date -
Nov 19, 2015
app pub date -
May 13, 2014
filing date -
Feb 4, 2009
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Abstract
An OFDM system generates a channel estimate in the time domain for use in either a frequency domain equalizer or in a time domain equalizer. Preferably channel estimation is accomplished in the time domain using a locally generated reference signal. The channel estimator generates an initial estimate from a cross correlation between the time domain reference signal and an input signal input to the receiver and generates at least one successive channel estimate. Preferably the successive channel estimate is determined by vector addition (or subtraction) to the initial channel estimate. The at least one successive channel estimate reduces the minimum mean square error of the estimate with respect to a received signal.
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