Demodulating frequency-modulated signals
US12047210B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 16, 2021 |
| Grant date | Jul 23, 2024 |
| Priority date | — |
| Expiry date | Jul 15, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W4/80
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of, and apparatus for, demodulating a frequency-modulated signal. The method comprises: for each of a plurality of templates, performing a respective cross-correlation operation between the template and data representative of the frequency-modulated signal, each template comprising data representative of a signal that is frequency-modulated with predetermined preamble data using a different respective modulation index; generating frequency-offset data from one or more of the cross-correlation operations, the frequency-offset data being representative of a difference between a reference frequency and a carrier frequency of the frequency-modulated signal; determining a respective peak correlation-coefficient value from each of the cross-correlation operations; identifying a highest peak correlation-coefficient value in the determined peak correlation-coefficient values; determining a modulation index estimate in dependence on which template produced the highest peak correlation-coefficient value; and using the frequency-offset data and the modulation index estimate to demodulate at least a portion of the frequency-modulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.