Method of coherent modulation and demodulation for hf data...

Details Method of coherent modulation and demodulation for hf data... Method of coherent modulation and demodulation for hf data...

H - Electricity

03

C

H03C 3/02 (2006.01) H03D 3/00 (2006.01) H04L 25/02 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2086295

The method is of the type consisting of the parallel transmission, an a determined number of channels at low bit rates, of the useful information symbols modulated according to a differential modulation comprising a determined number of phase states. It consists in making a parallel transmission, on all the channels, of the frames of useful signals and of the frames of reference symbols, a frame of reference symbols being inserted between two neighboring useful frames, and each reference symbol being alternated with a useful symbol in each frame of reference symbols. Application to the digital transmission of speech.

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