Robust protocol detection for near field communication devices operating in card-emulation mode
US10880767B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2019 |
| Grant date | Dec 29, 2020 |
| Priority date | — |
| Expiry date | Nov 21, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L69/03
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A contactless communication device includes a near field communication (NFC) module for generating an electromagnetic carrier signal and modulating the carrier signal according to data to be transmitted, and an antenna circuit coupled to and driven by said NFC module with the modulated carrier signal. The device includes an RF front end coupled between said NFC module and said antenna circuit and further includes a protocol detection circuit for detecting a protocol mode in response to an incoming signal received by the device. The protocol detection circuit includes a plurality of filters being adapted to generate an envelope of the incoming signal; a plurality of decoders being adapted to generate an output in response to a respective envelope generated by a corresponding one of the plurality of filters; and a decision unit being adapted to detect a protocol mode based on the output from each of the plurality of decoders.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.