Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2002-03-26
2008-08-12
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S136000, C375S142000, C375S147000
Reexamination Certificate
active
07411997
ABSTRACT:
A filter (201) accepts spreading code sequences or the like as input sequences of a chip rate 1/D, the accepted spreading code sequences are sequentially delayed and distributed by delay circuits (202) connected in series, delay times of individual signals are an arithmetical progression with a chip length D being a common difference D, the individual signals are amplified with spreading codes by amplifiers (203), amplification factors for the individual signals are a geometrical progression of a common ratio r, the sum of the amplified signals is obtained by addition in an adder (204), and the result is sequentially output as an output sequence.
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Shih Shenghung
Umeno Ken
Yamaguchi Akihiro
Brook Mitchell P.
Chaosware Inc.
Fan Chieh M.
Fotakis Aristocratis
Japan Science and Technology Corporation
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