Method of coherent modulation and demodulation for high frequenc

Details Method of coherent modulation and demodulation for high frequenc Method of coherent modulation and demodulation for high frequenc

1992-12-22

1996-11-05

Tse, Young T.

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375283, 375284, 375350, 370 23, H04L 2718, H04L 2726

Patent

active

055725481

ABSTRACT:
The method is of the type featuring a parallel transmission, over a predetermined number of transmission frequencies at a low bit rate, of useful information signals modulated at a predetermined phase shift keying. A parallel transmission on all the frequencies of the frames of useful signals and of frames of reference signals is performed, a frame of reference signals being inserted between two neighboring useful frames, and each reference signals being alternated with a useful signal in each frame of the reference signals. Such a method finds particular application to the digital transmission of speech.

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Schueli, Philips Research Reports Supplements, 1973, pp. 91-98.
Pennington, IEEE Proceedings, 1989, pp. 11-19. "Techniques for medium-speed data transmission over HF channels".

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