Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-05-09
2006-05-09
Tran, Khai (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S343000, C375S362000, C375S367000, C370S342000, C455S561000
Reexamination Certificate
active
07042924
ABSTRACT:
A synchronization establishing and tracking circuit for a CDMA base station is composed of a first spreading code generator, a first correlator, a second spreading code generator, a second correlator, and a phase determining circuit. The first spreading code generator generates a first spreading code sequence. The first correlator calculates first correlation between the first spreading code sequence and a first quasi-coherent signal corresponding to a first received signal received by the CDMA base station. The second spreading code generator generates a second spreading code sequence. The second correlator calculates second correlation between the second spreading code sequence and a second quasi-coherent signal corresponding to a second received signal received by the CDMA base station. The phase determining circuit determines a first phase of the first spreading code sequence based on an added quasi-coherent signal to which the first and second quasi-coherent signals are added.
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Chang Edith
Dickstein Shapiro Morin & Oshinsky LLP.
NEC Corporation
Tran Khai
LandOfFree
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