Integrated circuits and methods for protocol detection and decoding in near field communications
AssigneeStmicroelectronics Razvoj Polprevodnikov D.O.O.
InventorsMaksimiljan Stiglic, Iztok Bratuz, Albin Pevec, Roman Benkovic
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Abstract
A method for decoding a data stream carried by a modulated signal includes receiving the modulated signal. The modulated signal is modulated according to a protocol belonging to a group of protocols including at least three protocols. The method further includes extracting a clock signal from the received modulated signal, detecting the protocol, and decoding the data stream according to the detected protocol using the extracted clock signal.
Claims23
A method for decoding a data stream carried by a modulated signal, the method comprising:
- receiving the modulated signal, the modulated signal being modulated according to a protocol belonging to a group of protocols comprising a first protocol, a second protocol, and a third protocol;
- extracting a clock signal from the modulated signal;
- detecting the protocol by
- Performing an on-off keying (OOK) demodulation on the modulated signal to generate an OOK-demodulated signal,
- in response to the OOK-demodulated signal having a “o” state, stopping the clock signal and detecting the protocol, and
- maintaining the clock signal during reception of a non-modulated signal;
- and
- decoding the data stream according to the detected protocol using the clock signal.
A method for decoding a data stream carried by a modulated signal, the method comprising:
- receiving the modulated signal, the modulated signal being modulated according to a protocol belonging to a group of protocols comprising a Type A protocol of the ISO/IEC14443 standard, a Type B protocol of the ISO/IEC14443 standard, and a Type F protocol of the JIS.X.6319 standard;
- extracting a clock signal from the modulated signal;
- detecting the protocol by
- performing an on-off keying (OOK) demodulation on the modulated signal to generate an OOK-demodulated signal,
- in response to the OOK-demodulated signal having a “0” state, stopping the clock signal and detecting that the protocol is the Type A protocol,
- maintaining the clock signal during reception of a non-modulated signal;
- and
- decoding the data stream according to the detected protocol using the clock signal.
An integrated circuit for decoding a data stream carried by a modulated signal comprising:
- a wireless receiver configured to receive the modulated signal, the modulated signal being modulated according to a protocol belonging to a group of protocols selected from the group consisting of a Type A protocol of the ISO/IEC14443 standard, a Type B protocol of the ISOREC14443 standard, and a Type F protocol of the JIS.X.6319 standard;
- a clock extractor coupled to the wireless receiver and configured to extract a clock signal from the modulated signal;
- a detector coupled to the wireless receiver and configured to configured to detect the protocol by performing an on-off keying (OOK) demodulation on the modulated signal to generate an OOK-demodulated signal, and detecting that the protocol is the Type A protocol in response to the OOK-demodulated signal having a “0” state;
- a blocking circuit coupled to the clock extractor and configured to stop the clock signal in response to the OOK-demodulated signal having a “0” state and maintain the clock signal during reception of a non-modulated signal;
- and
- a decoder configured to decode the data stream according to the detected protocol using the clock signal.
Dependencies are inferred from the claim text.