Demodulators – Phase shift keying or quadrature amplitude demodulator – Input signal combined with local oscillator or carrier...
Patent
1990-12-19
1992-05-12
Mis, David
Demodulators
Phase shift keying or quadrature amplitude demodulator
Input signal combined with local oscillator or carrier...
329307, 375 39, 375 80, H03D 300
Patent
active
051131420
ABSTRACT:
A QAM demodulator having an adaptive automatic equalizer includes a transversal filter of a band-pass filter type, a reference carrier generator for generating a complex reference carrier, an error detector for obtaining complex error data, and a gain tap coefficient adjusting unit for adjusting the complex gain tap coefficients using the complex error data and the complex reference carrier data. The gain tap coefficient adjusting unit includes first complex multipliers for multiplying the complex data of the reference carrier outputted from the reference carrier generator by the input data, second complex multiplier for multiplying a predetermined coefficient by the complex error data outputted from the error detector, third complex multipliers for multiplying the output data of the first complex multipliers respectively by the output data of the second complex multiplier, thereby obtaining the complex quantity for adjusting the complex gain tap coefficients for the automatic equalizer.
REFERENCES:
patent: 3723911 (1973-03-01), Forney, Jr.
patent: 4004226 (1977-01-01), Qureshi et al.
patent: 4771438 (1988-09-01), Nash
Mis David
Sharp Kabushiki Kaisha
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