Sync acquisition and tracking circuit for DS/CDMA receiver
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United States of America Patent
Stats
-
Aug 27, 1996
Grant Date -
N/A
app pub date -
Dec 30, 1994
filing date -
Dec 30, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a sync acquisition and tracking circuit for a DS/CDMA receiver, phase position signals are sequentially and cyclically selected at a specified rate higher than the rate at which Rayleigh fading occurs. The selected signal is used to-control the phase of PN sequences. Correlation is taken between spread pilot signals and the orthogonal PN sequences at a chip rate to produce despread pilot signals, which are integrated to produce a correlation value. A set of accumulators are provided, which are sequentially and cyclically selected at the specified rate. The correlation value is applied to the selected accumulator to produce a total sum of correlation values. The highest total sums are selected from the outputs of all accumulators, and corresponding phase position signals are identified. A set of orthogonal despreading sequences are generated corresponding to the identified phase position signals for application to the receiver.
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