Dual code spread spectrum communication system

Details Dual code spread spectrum communication system Dual code spread spectrum communication system

2008-07-08

2008-07-08

Ghayour, Mohammad H. (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S148000, C375S130000, C375S144000, C375S316000

Reexamination Certificate

active

07397840

ABSTRACT:
A direct sequence spread spectrum receiver includes a first spreading code generator for receiving a first channel signal spectrum spread by a first spread code, while a second group of receivers use a second spreading code, where the first and second codes are partially correlated, so that, the first group of receivers receive all messages communicated while the second group of receivers only receives a portion of the messages. In this manner, a spread spectrum broadcast system can selectively communicate to a selected portion of receivers in a whole group of receivers by simply switching the spreading code at the transmitter.

REFERENCES:
patent: 5111478 (1992-05-01), McDonald
patent: 5786791 (1998-07-01), Bruckert
patent: 5862172 (1999-01-01), Sugita et al.
patent: 6611511 (2003-08-01), Schulz
patent: 2003/0090414 (2003-05-01), Syrjarinne et al.

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