Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2005-08-30
2005-08-30
Vu, Huy D. (Department: 2665)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C370S310000
Reexamination Certificate
active
06937559
ABSTRACT:
A channel spreading device for a CDMA communication system is disclosed. The channel spreading device includes; a storage medium for storing orthogonal code numbers which cannot maintain an orthogonality when an orthogonal code for a maximum data rate is used; a controller for determining whether the respective orthogonal code numbers stored in the storage medium are available at a given data rate, when at least one data user requests data transmission at the given data rate, and outputting the determined available orthogonal code numbers and control signals according to the determination result; a plurality of channel transmitters, provided in association with the orthogonal code numbers from the controller, for spreading data from the data user with an orthogonal code corresponding to the orthogonal code number from the controller; and a plurality of multipliers for multiplying outputs of the channel transmitters by control signals from the controller, a plurality of channel transmission circuits; a storage medium for storing orthogonal code numbers which cannot maintain an orthogonality when an orthogonal code for a maximum data rate is used; a controller for determining whether the respective orthogonal code numbers stored in the storage medium are available at a given data rate, when at least one data user requests data transmission at the given data rate, and outputting the determined available orthogonal code numbers and control signals according to the determination result.
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Japanese Office Action dated Jan. 6, 2004 issued in a counterpart application, namely, Appln. No. 2000-599147.
Ahn Jae-Min
Kang Hee-Won
Kim Jae-Yoel
Maeng Seung-Joo
Dilworth & Barrese LLP
Ryman Daniel
Vu Huy D.
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