Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1989-07-24
1991-06-18
Tarcza, Thomas H.
Pulse or digital communications
Spread spectrum
Direct sequence
375113, 370 48, 370 99, 370106, H04L 2538, H04L 706
Patent
active
050254596
ABSTRACT:
An improved digital communications system is disclosed in which synchronization information is transmitted with the data. A start pulse, having a duration different than the other pulses in the transmitted digital data signal is used to mark the beginning of the frame of digital data. Preferably, a midpoint pulse is also transmitted with the start pulse to mark the midpoint of the frame to facilitate the generation of a local clock signal. Bit positions within the transmitted signal are sampled by sampling pulses which are generated by digital timers having time intervals keyed to the start and midpoint pulses.
REFERENCES:
patent: 3430204 (1969-02-01), Milford
patent: 4413336 (1983-11-01), Chaillie et al.
patent: 4589120 (1986-05-01), Mendala
Optical Communications Corp.
Tarcza Thomas H.
Wallace Linda J.
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