System for the ultra-high frequency transmission of numerical da

Details System for the ultra-high frequency transmission of numerical da System for the ultra-high frequency transmission of numerical da

1980-06-20

1983-06-14

Caldwell, John W.

Pulse or digital communications

Repeaters

Testing

375 25, 375 39, 375 56, 375 80, 370 22, 364727, H04B 1200

Patent

active

043887260

ABSTRACT:
A system for communicating numerical data over an UHF radio channel including a transmitter and receiver. The transmitter includes an UHF oscillator whose frequency is modulated by binary information elements from a coding device. The coding device includes a first coder for providing limited sum coding and a second coder coupled to the first coder for providing Walsh I coding. The excursion of the coded signals modulating the UHF oscillator is selected to obtain a radiating spectrum of the two-phase P.S.K. type with no spectral component at the carrier frequency and having quadrature components resulting from its timing. The receiver includes a coherent-phase demodulator and means for reconstituting a decoded signal for generating carrier and timing signals.

REFERENCES:
patent: 3470324 (1969-09-01), Harmuth
patent: 3519937 (1970-07-01), Hubbard
patent: 3539925 (1970-11-01), Seidel
patent: 3701143 (1972-10-01), Nacht
patent: 3984778 (1976-10-01), Bhopale
L'Onde Electrique, vol. 58, No. 1-Jan. 1978, V. Maurel "Exemples de transcodage adapte a la transmission numerique", pp. 50-55.
IEEE Transactions On Aerospace and Electronics, vol. AES-6, No. 4, Jul. 1970-R. A. Gonsalves: "Performance of Manchester coded FSK", pp. 598-599.

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