FIELD: radio engineering; digital data transfer in short-wave radio station.
SUBSTANCE: novelty is that prior-art parallel short-wave modem having modulator and demodulator is provided with N amplitude keyers newly introduced in modulator, as well as p narrow-band filters, p 90 deg. phase shifters, where p is number of pilot signals in group signal, p amplitude detectors, p reset integrators, and mp quadrature single side-band converters, in demodulator.
EFFECT: ability of retaining serviceable condition of modem on occurrence of fast fading.
1 cl, 13 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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|
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| METHOD FOR TRANSMITTING INFORMATION | 2003 |
|
RU2248097C2 |
