Bidirectional digital signal communication system

Details Bidirectional digital signal communication system Bidirectional digital signal communication system

H - Electricity

04

B

325/28, 325/3

H04B 7/24 (2006.01) H04B 1/707 (2006.01) H04L 7/04 (2006.01)

Patent

CA 1235186

ABSTRACT OF THE DISCLOSURE A bidirectional digital signal communication system includes a plurality of terminal units in communica- tion with a center unit. Each of the terminal units in- cludes 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 trans- mitting 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 sup- plied 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 multi- plier 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.

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