CARRIER ROCOVERY FOR A 16-QAM SIGNAL

PURPOSE: A carrier wave restoration method of a 16-QAM(16 level quadrature amplitude modulation) signal is provided to reduce inter-symbol interference by reducing the effect of phase jitter. CONSTITUTION: A hard limiter(90) and an envelope detector(70) reconstruct an input signal to amplitude modul...

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Bibliographic Details
Main Authors AHN, JEE-HWAN, PARK, YOUNG-OK
Format Patent
LanguageEnglish
Published 16.10.2000
Edition7
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:PURPOSE: A carrier wave restoration method of a 16-QAM(16 level quadrature amplitude modulation) signal is provided to reduce inter-symbol interference by reducing the effect of phase jitter. CONSTITUTION: A hard limiter(90) and an envelope detector(70) reconstruct an input signal to amplitude modulation component and phase modulation component. A window detector(80) extracts a time interval where a phase jitter is generated from the reconstructed amplitude modulation signal. Carrier wave tracking of a digital phase locked loop(PLL) is controlled using the reconstructed amplitude modulation signal. Analog switches at the input and output terminals of a phase detector performs track/hold function.
Bibliography:Application Number: KR19970055645