Method of and means for spread-spectrum transmission

Details Method of and means for spread-spectrum transmission Method of and means for spread-spectrum transmission

1980-12-12

1982-12-21

Brigance, Gerald L.

Multiplex communications

Wide area network

Packet switching

370 19, H04J 1300

Patent

active

043653278

ABSTRACT:
An analog signal sent from one telephone subscriber to another is periodically sampled at a transmitting terminal and each sample is held for a storage period equal to a sampling interval as well as to a basic pulse period of a random or pseudorandom sequence of bipolar binary pulses. A stepped wave formed from these samples is mixed with that pulse sequence before being conveyed, e.g. by frequency modulation, to a receiving terminal where the wave so distorted is mixed with a like pulse sequence to re-establish the undistorted wave which may be contaminated by interferences from other users of the same signal link. The steps of the re-established wave are integrated over periods equal to the sampling interval and the integration products are stored for like periods to produce a purged stepped wave from which high-frequency components are subsequently filtered out to restore the original analog signal. The signal link utilized may be an emergency channel made available, e.g. for communication with a mobile station, when regular channels are busy.

REFERENCES:
patent: 4001564 (1977-01-01), Bied-Charreton et al.
patent: 4312073 (1982-01-01), de Niet et al.
"Spread Spectrum as a Multiplexing Technique", Proceedings of the IREE, vol. 34 No. 4, May 1973.

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