Demodulating modulated signals
US12081377B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2021 |
| Grant date | Sep 3, 2024 |
| Priority date | — |
| Expiry date | Jun 16, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0095
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus for demodulating a frequency-modulated signal comprises a joint frequency-offset & modulation-index estimator, and a signal demodulator. The joint estimator receives data representative of a preamble portion of the signal, modulated with predetermined preamble data. It jointly determines a frequency-offset estimate and a modulation-index estimate by using an optimization process that minimizes a cost function that is a function of the received data and that is parameterised by a frequency-offset parameter and by a modulation-index parameter. The signal demodulator receives data representative of a message portion of the signal, modulated with message data, and uses the frequency-offset estimate to demodulate the message.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.