Pulse or digital communications – Repeaters – Testing
Patent
1981-09-14
1984-08-28
Ng, Jin F.
Pulse or digital communications
Repeaters
Testing
375 1, 340310R, H03K 706
Patent
active
044687923
ABSTRACT:
A method for transmission of digital data utilizes a carrier frequency offset in a first frequency direction for a first binary condition, and offset in a second frequency direction for the remaining binary condition, at the start of a bit time interval. The carrier frequency is swept in a preselected frequency direction during each bit time interval, to produce a chirped frequency-shift-keyed waveform in the frequency domain, for transmission of each bit of binary data. Frequency-shift-keyed demodulation is utilized at a receiving end, with the receiver synchronized to the transmitter bit time interval, to recover the transmitted digital data. Apparatus for data transmission using this chirped frequency-shift-keyed modulation waveform is disclosed.
REFERENCES:
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patent: 3691464 (1972-09-01), Dayton et al.
patent: 3777269 (1973-12-01), Brady
patent: 3824466 (1974-07-01), Olier et al.
patent: 4209750 (1980-06-01), Freitas et al.
patent: 4312072 (1982-01-01), Vogel
Baker Lewin T.
Bose Sanjay K.
Ellis George W.
Puckette Charles M.
Chin Stephen
Davis Jr. James C.
General Electric Company
Krauss Geoffrey H.
Ng Jin F.
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