Frequency estimation, correction and noise suppression for modems
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United States of America Patent
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Feb 27, 2018
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app pub date -
Jun 22, 2017
filing date -
Jan 13, 2017
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Abstract
A frequency-shift keying (FSK) demodulator includes a digital phase-locked loop (DPLL) based frequency estimator to convert a phase signal to a frequency signal, a frequency offset estimator to estimate and track direct current (DC) component of the frequency signal, and an average filter communicatively coupled to the frequency offset estimator to perform an accumulate-and-dump operation to improve a symbol-level signal to noise ratio (SNR) of the frequency signal.
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