Spread spectrum coding method and apparatus

Details Spread spectrum coding method and apparatus Spread spectrum coding method and apparatus

1984-07-10

1986-08-12

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 96, 375115, 364717, 178 2214, H04L 902, H04B 1500

Patent

active

046060391

ABSTRACT:
In a process for coding of radio transmissions by spectrum spreading, a signal is phase modulated by means of a 0-pi modulator controlled by a psuedo random sequence formed by combining in accordance with a logical majority function an odd number of elementary codes constituted by pseudo random binary sequences of different lengths. On reception, the synchronization of the code which controls the demodulator is realized by correlating each of the elementary codes with the received signal.

REFERENCES:
patent: 4308617 (1981-12-01), German, Jr.
patent: 4320513 (1982-03-01), Lampert
patent: 4341925 (1982-07-01), Frosch
patent: 4450321 (1984-05-01), Quigley et al.
R. C. Dixon (1976), "Spread Spectrum Systems," pp. 13-191.
IEE Proceedings-F, vol. 128, No. 5 (Oct. 1981), M. S. Shipton et al, "Improvements in Use of Contested Spectrum for Land Mobile Radio Service by Adoption of Bandsharing Spread-Spectrum System with TV Broadcast Channels," pp. 245-260.

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