Digital transmission demodulator including an automatic fault corrector
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United States of America Patent
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Sep 25, 1990
Grant Date -
N/A
app pub date -
Nov 20, 1989
filing date -
Nov 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A conventional demodulator for digital transmission includes means (12) for splitting the received HF signal into two identical auxiliary signals, mixers (20, 30) for transposing the auxiliary signals into in-phase and quadrature baseband components by multiplying them with in-phase and quadrature output signals from a local oscillator (14), and respective filter and amplifier means (22, 24; 32, 34) and analog-to-digital converters (26, 36) on the in-phase and quadrature channels. In addition, the demodulator includes estimation means (100) suitable for estimating faults on groups of samples (Y.sub.p,k, Y.sub.q,k) taken from the outputs of the analog-to-digital converters (26, 36), with the faults being estimated in the form of five parameters, and correction means (200) for correcting current samples (Y.sub.p, Y.sub.q) on the basis of the parameters estimated on an earlier group of samples.
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