Bidirectional digital signal communication system

Details Bidirectional digital signal communication system Bidirectional digital signal communication system

1985-04-25

1987-01-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375115, 370107, H04K 100

Patent

active

046352740

ABSTRACT:
A bidirectional digital signal communication system includes a plurality of terminal units in communication with a center unit. Each of the terminal units includes a signal generator for generating digital data spread with a PN (pseudo-noise) code, a modulator for modulating the digital data on a carrier, and a transmitter for transmitting the modulated digital signal to the center unit through a transmission line. The center unit includes a receiver for receiving the modulated digital signal, a PN code generator for locally generating a PN code which corresponds to the transmitted PN code, a multiplier supplied with outputs of the receiver and the PN code generator to produce a digital signal de-spread from the PN code, a demodulator connected to the multiplier to reproduce the digital data from the modulated digital signal, and a memory for storing the PN code when the signal level of the multiplier exceeds a predetermined value. The stored PN code is retrieved from the memory to enable rapid synchronization with the next transmission received from the terminal unit.

REFERENCES:
patent: 4351064 (1982-09-01), Ewanus
patent: 4426712 (1984-01-01), Gorski-Popiel
patent: 4517679 (1985-05-01), Clark
patent: 4532635 (1985-07-01), Mangulis

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