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

1982-11-09

Brigance, Gerald L.

Multiplex communications

Wide area network

Packet switching

370 19, H04J 1300

Patent

active

043588441

ABSTRACT:
An analog signal sent from one telephone subscriber to another is differentiated at a transmitting terminal and the resulting derivative is distorted by mixing with a random or pseudorandom sequence of bipolar binary pulses before being conveyed, e.g. by frequency modulation, to a receiving terminal where it is mixed with a like pulse sequence to re-establish the undistorted derivative signal with substantial suppression of interferences from other users of the same signal link. The re-established signal is integrated over intervals equal to a basic pulse period of the binary sequence and each signal sample thus obtained is additively combined with the sample from the immediately preceding period 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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