Frequency synchronization for a near field communication (NFC) device
US9559833B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2015 |
| Grant date | Jan 31, 2017 |
| Priority date | — |
| Expiry date | Oct 23, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B5/45
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A first near field communication (NFC) device is disclosed that synchronizes a first carrier wave of the first NFC device to a second carrier wave of a second NFC device. The first NFC device observes a magnetic field having the first carrier wave modulated with information corresponding to the first NFC device and the second carrier wave modulated with information corresponding to the second NFC device. The first NFC device isolates the information corresponding to the second NFC device from the combined sequence of information to determine a frequency error and/or a phase error between the carrier waves. Finally, the first NFC device adjusts the frequency of the first carrier wave in accordance with the first frequency error and/or the phase of the first carrier wave in accordance with the first phase error to synchronize the carrier waves.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.