Multipath channel tap delay estimation in a CDMA spread spectrum receiver
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United States of America Patent
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Jun 13, 2006
Grant Date -
Dec 25, 2003
app pub date -
Jun 24, 2002
filing date -
Jun 24, 2002
priority date (Note) -
Expired
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Abstract
A method and apparatus for estimating channel tap delays of multipath components in a CDMA received signal. The search for the tap delays are split into two phases namely, a phase 1 and a phase 2 search. The phase 1 search is a coarse resolution quick search adapted to generate a rough estimate of the location of the tap delays. During this phase, the candidate codes are summed and the input signal correlated with the code sum creating an ambiguity in the code associated with the multipath. A finer resolution slower phase 2 search resolves the code ambiguity present in the initial rough estimates of the phase 1 search. Additional phase 2 correlations may be performed to implement a code-tracking loop.
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