Adaptive thresholding algorithm for the noise due to unknown symbols in correlation based channel impulse response (CIR) estimate
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United States of America Patent
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May 12, 2009
Grant Date -
Aug 16, 2007
app pub date -
Mar 23, 2007
filing date -
May 29, 2002
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Abstract
An impulse response is estimated for a channel by estimating an intermediate impulse response of the channel. The intermediate impulse response comprises at least one multipath spike and one or more non-deterministic noise components at locations throughout the channel Then, a threshold function is applied to the estimated intermediate impulse response across at least a portion of the channel in order to provide an estimated final impulse response of the channel. The threshold function has the effect of nulling the noise components of the channel having values less than the threshold function at the location within the channel of the respective noise component, and the threshold function is characterized by a level that varies across the portion of the channel from a minimum value to a maximum value in a manner determined by the location of the at least one multipath spike within the channel.
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