Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-06-13
2006-06-13
Bocure, Tesfaldet (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S152000
Reexamination Certificate
active
07061968
ABSTRACT:
In a mobile communication system, the tracking of synchronization is conducted in a stable state even in a multipath environment. A delay profile detector calculates a delay profile a(n) using a despread signal for each processing unit n. A delay profile averaging unit averages a(n) to produce Ave(|a(n)|2). A data symbol detector conducts rake combining of the despread signal using a(n) and Ave(|a(n)|2). According to a(n) and Ave(|a(n)|2, a weighting function unit calculates a representative value representing delay waves. A loop filter generates a control signal in response to the representative value. A clock controller controls a spread code generator according to the control signal.
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Doi Nobukazu
Suzuki Toshiro
Uta Takaki
Yano Takashi
Bocure Tesfaldet
Hitachi , Ltd.
Mattingly ,Stanger ,Malur & Brundidge, P.C.
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