Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2002-12-17
2008-03-25
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C370S320000, C370S335000, C370S342000, C370S441000, C370S537000, C370S538000, C375S260000, C398S078000
Reexamination Certificate
active
07349460
ABSTRACT:
Provided are multi-carrier (MC)/multi-carrier direct sequence (MC-DS) dual-mode adaptable CDMA apparatus, the method thereof, and a computer program that implements the method. The apparatus can vary the user modulation degree and the transmission repetition degree independently, and convert a spreading scheme between the time-based spreading scheme (MC-DS-CDMA) and the frequency-based spreading scheme (MC-CDMA) in a MC-CDMA system. The apparatus includes: a user signal processing unit for performing symbol modulation, repetition and spreading of bit stream for each user based on a transmission mode suitable for channel environment of each user, and generating spread chip streams for the user; a combining unit for adding up all the spread chip streams for the users; a first interleaving unit for interleaving the chip streams added up in the combining unit and generating a first interleaved stream; and a second interleaving unit for optionally performing a second interleaving on the first interleaved stream.
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Choi Kwon-Hue
Kim Soo-Young
Oh Deock-Gil
Blakely & Sokoloff, Taylor & Zafman
DSouza Adolf
Electronics and Telecommunications Research Institute
Payne David C.
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