Pulse or digital communications – Repeaters – Testing
Patent
1995-03-06
1997-12-09
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375207, 375232, 375367, 370335, 370342, 370441, 370527, H04B 1500, H04K 100, H04L 2730
Patent
active
056967896
ABSTRACT:
A novel code division multiple access (CDMA) system and apparatus is provided which permits a plurality of encoded modulated data messages to be transmitted simultaneously on the same channel in one frequency band as a composite CDMA signal. An identification signal is generated and spread by a spreading signal having a duty cycle less than fifty percent to produce a combined signal which is transmitted to a receiver having a tapped delay with a plurality of taps each of which produce a replica of the received combined signal delayed by an odd multiple of the duty cycle of the spreading signal. Each of the replica signals is multiplied by a predetermined weighted value to produce weighted delayed signals and a controller responsive to the received combined signal, is employed for controlling individual weighted delayed signals which are then combined to suppress the spreading signal leaving the identification signal.
REFERENCES:
patent: 5031173 (1991-07-01), Short et al.
patent: 5231400 (1993-07-01), Mouldin et al.
patent: 5594754 (1997-01-01), Dohi et al.
patent: 5596570 (1997-01-01), Soliman
Jones Robert V.
Saggio Richard J.
Zscheile, Jr. John W.
Chin Stephen
O'Rourke John F.
Sowell John B.
Starr Mark T.
Unisys Corporation
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