Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-05-02
2006-05-02
Liu, Shuwang (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S145000, C375S149000, C370S342000, C370S335000
Reexamination Certificate
active
07039100
ABSTRACT:
A mobile station in a spread spectrum communications system includes a matched filter that can be divided into segments. On initial acquisition, when a frequency deviation between the expected receiving frequency of the mobile station and the transmitting frequency of the base station is expected to be relatively large, the device can operate in a first synchronisation mode, in which the filter is used divided into segments. On searching for alternative cells, when the frequency deviation is expected to be smaller, the device can operate in a second synchronisation mode, in which the filter is used undivided. Thus, in the first mode, a reduced filter length avoids the difficulties caused by frequency deviation, while, in the second mode, an increased filter length allows faster acquisition.
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Cavander Hans
Lennartsson Lars
Liu Shuwang
Pathak Sudhanshu C.
Potomac Patent Group PLLC
Telefonaktiebolaget L M Ericsson (publ)
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