Multiplex communications – Communication over free space – Repeater
Patent
1994-12-15
1997-08-05
Hsu, Alpus H.
Multiplex communications
Communication over free space
Repeater
375208, 370324, 370209, H04B 7216
Patent
active
056549555
ABSTRACT:
An OCDMA satellite communication system in which an earth-based hub station receives, via a satellite, a plurality of spread spectrum signals from a corresponding plurality of earth-based subscriber stations on a selected frequency channel, each signal from a subscriber station being composed of data symbols overlaid with one set of orthogonal Rademacher-Walsh (RW) functions and a pseudo-noise PN sequence, the signals from subscriber stations being synchronized to arrive at the hub station in time and frequency synchronism. A subscriber station net entry channel (NEC) is comprised of a transmitter function at the subscriber stations for transmitting a spread spectrum NEC signal located in a spectral null of the OCDMA signals between the earth-based hub station and the subscriber stations. Receiver functions at the earth-based hub station detect and demodulate the NEC signal and assign a frequency and RW function to the user, and transmits frequency and time correction signals to the user to assure that the user is near time synchronism upon net entry.
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Francis Natall et al, "Spread Spectrum Technology for Commercial Applications", Proceedings of IEEE, Jun. 1994.
Hsu Alpus H.
Rao Seema S.
Stanford Telecommunications, Inc.
Zegeer, Esq. Jim
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