Windowed digital matched filter circuit for power reduction in battery-powered CDMA radios
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United States of America Patent
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Jun 13, 2000
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N/A
app pub date -
Mar 25, 1997
filing date -
Mar 25, 1997
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Abstract
A digital matched filter for a CDMA radio comprises a digital delay line having a plurality of successive delay stages adapted to receive a digital signal and propagate the digital signal therethrough at a fixed rate. A correlator is coupled to the digital delay line to correlate the digital signal to a predefined spreading code to provide a correlation signal representing a degree of correlation of the digital signal to the spreading code. A window logic unit is coupled to the correlator to enable operation of the correlator only during successive discrete time periods of the correlation signal corresponding to a high degree of correlation of the digital signal to the spreading code.
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