Method and apparatus of using a bank of filters for excision of narrow band interference signal from CDMA signal
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United States of America Patent
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Jul 30, 2002
Grant Date -
N/A
app pub date -
Sep 14, 1998
filing date -
Sep 14, 1998
priority date (Note) -
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Abstract
A narrow band interference excision circuit for use in broadband digital data communication systems such as CDMA systems. The excision circuit is comprised of a matrix of polyphase filters that divide the input signal into a plurality of narrow subbands. Each narrow subband signal is examined to determine if narrowband interference exists in that bin. This is done preferably by computing the average power of the subband signal. If a signal in a bin has an average power greater than some adjustable or adaptive threshold, then the entire subband signal is eliminated. A bank of polyphase synthesis filters reassembles the composite signal. An equalization circuit with an error predictor comprised of an adaptive FIR filter is coupled to adapt coefficients of the filter and generate a colored noise cancellation signal to remove colored noise from the input to the slicer.
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