Process for protected transmission of digital signals

Details Process for protected transmission of digital signals Process for protected transmission of digital signals

1982-08-05

1985-04-30

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 58, 371 95, 375 33, 455 38, H04L 2730, H04J 600

Patent

active

045148520

ABSTRACT:
In order to achieve a higher resistance to interference with respect to alien sources of deliberate interference in the use of communication connections via short waves, certain cooperative measures are proposed which include that the stations are equipped with highly-constant quartz crystal clocks and the bursts of information to be transmitted are accompanied by a time signal with the aid of which it is possible to correct any time tolerances between the stations. With an acknowledgment signal, use is made of a frequency variation of the radio frequency in the timing of consecutive burst transmissions including the acknowledgment response. The information contained in a burst in a fault safeguarded fashion is transmitted in coded form. The code sequence for encoding the information component and the fault safeguarding component of a burst and for the frequency address which determines the transmitting and receiving frequencies is recalculated for each burst on the basis of the clock time of the quartz crystal clock and on the basis of a subscriber number.

REFERENCES:
patent: 3754211 (1973-08-01), Rocher et al.
patent: 4074230 (1978-02-01), Icenbice, Jr.
patent: 4222115 (1980-09-01), Cooper et al.
patent: 4242755 (1980-12-01), Gauzan
patent: 4280224 (1981-07-01), Chethik
patent: 4346475 (1982-08-01), Alexis
patent: 4383323 (1983-05-01), Timor
Telegraph and Data Transmission Over Shortwave Radio Links, 1981, pp. 101-110 and 178-182.
Elhakeem et al., "New Code Acquisition Techniques in Spread-Spectrum Communication", IEEE Trans. on Comm., vol. Com-28, No. 2, Feb. 1980, pp. 249-257.
Chow et al., "A Spread Spectrum Modem for Reliable Data Transmission in the High Frequency Band", Second Conference on HF Communication Systems and Techniques, London, England, Feb. 15-17, 1982, pp. 125-130.

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