Communication system

Details Communication system Communication system

1990-04-04

1991-10-08

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, 380 48, 375115, 375120, H04L 2730

Patent

active

050561081

ABSTRACT:
In a spread spectrum communication system, sequence signals are developed in both a transmitter and receiver, in each case being derived from a clock signal through digital count-down and logic circuitry including a programmable counter which receives control number defining groups of signals from a memory under control of an indexing counter. A sequence signal in the transmitter is applied through a filter to produce a filtered signal which is propagated as a sequence of variations of alternating polarity with predetermined varying durations occurring in a predetermined distinctive order. A received signal and sequence signal of the same form as in the transmitter are applied to a product detector the output of which is applied to an integrator. Loop circuitry is provided for synchronizing the generation of the sequence signal in the receiver with that in the transmitter. A plurality of channels may be provided, using common synchronizing and other circuitry.

REFERENCES:
patent: 3878527 (1975-04-01), Rensin et al.
patent: 3890472 (1975-06-01), Fisk et al.
Simon et al., Spread Spectrum Communications, (Computer Science Press, Inc.; 1985; pp. 1-15, 40-47, 63-71, 76-82, 98-101, & 123-134).

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