Method and apparatus for transmitting messages to and from remot

Details Method and apparatus for transmitting messages to and from remot Method and apparatus for transmitting messages to and from remot

1975-06-13

1977-06-14

Safourek, Benedict V.

325 40, 325 56, 325 63, H04B 702

Patent

active

040300331

ABSTRACT:
A method and apparatus for transmitting a message, in digital form, to or from a remote location. In a transmitter, a sequence of predetermined multiple-bit phase codes corresponding to the individual characters in the message phase modulate a carrier wave which also shifts frequency. At a receiving station, the various modulated carrier waves propagated through a dispersive medium constitute incoming signals with both frequency and range diversity. The receiver transforms the incoming signals into a sequence of quadrature component signals which it correlates with the multiple-bit phase code sequences to yield the digital representation of a transmitted message character at the receiving station.

REFERENCES:
patent: 3335409 (1967-08-01), Heller et al.
patent: 3423729 (1969-01-01), Heller
patent: 3617889 (1971-11-01), Rabinowitz
patent: 3781794 (1973-12-01), Morris

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