Frequency estimation, correction and noise suppression for modems
US9906386B1 · kind B1 · utility
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17Claims
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Key dates
| Filing date | Jun 22, 2017 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Jun 22, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/081
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.