Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-01-10
2006-01-10
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000, C375S147000
Reexamination Certificate
active
06985517
ABSTRACT:
The present invention provides a matched filter and correlation detection method that carries out correlation detection on a time-division basis on a reception signal with known periodic codes inserted as in the case of a preamble search by a base station that carries out a CDMA communication. The mobile station multiplies 16 types of signature codes by a common scrambling code, generates a preamble signal and carries out transmission. The base station carries out despreading by multiplying the scrambling code and reproduces the signature codes. Then, the first cumulative addition section carries out a cumulative addition on a plurality of sets of data portions at a same position corresponding to the cycle of the signature codes and then the multiplication section multiplies signature codes. Finally, the second cumulative addition section adds up symbols and detects a correlation.
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Kido Naoshige
Matsumoto Takenori
Chin Stephen
Greenblum & Bernstein P.L.C.
Lu Jia
Matsushita Electric - Industrial Co., Ltd.
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