Krott, Michel

An integrated circuit for a wireless charging device, the integrated circuit configured to: communicate with a receiver device using near field communication, NFC; determine one or more processing response times of the receiver device based on the communication; and determine if the receiver device comprises a passive NFC tag or a powered NFC device based on the one or more processing response times.

There is disclosed a method for determining a backscatter link frequency, BLF, value in a radio frequency identification, RFID, tag device, by continuously evaluating incoming waveforms. Upon detecting the start of a TRCAL symbol a first and a second clock driven counters are initialized. The first counter is associated with a first divide ratio and the second counter is associated with a second divide ratio. The counters are incremented every clock cycle until the end of the TRCAL symbol is detected. At the end of the query command the divide ratio is determined, and the corresponding counter is selected. The counter value is stored as BLF indicator and indicates the BLF. Also disclosed is an RFID tag.

An apparatus comprising: an ultra-wideband device comprising a transmitter and a receiver; one or more processors configured to control the transmitter and receiver to perform a UWB ranging round with a remote UWB device, the UWB ranging round comprising the receipt of one or more ranging frames and the transmission of one or more responses for determination of a ranging-based distance, wherein the processors are further configured to provide for transmission of one or more radar frames during the UWB ranging round and, based on a corresponding one or more received reflections of the one or more radar frames, determine one or more radar-based distances between the UWB device and the remote UWB device, wherein the processors are configured to verify the ranging-based distance by determining whether or not the one or more radar-based distances contravene a predetermined minimum-possible-distance or a predetermined maximum-possible-distance.

In accordance with a first aspect of the present disclosure, a near field communication (NFC) device is provided, comprising: a first NFC antenna; an NFC unit operatively coupled to said first NFC antenna; and a field detection unit comprising a second NFC antenna, wherein said field detection unit is configured to detect, when operated in a first state, whether an electromagnetic field is present on the first NFC antenna by tuning the second NFC antenna to the operating frequency of the first NFC antenna and by detecting whether said electromagnetic field is present on the second NFC antenna. In accordance with a second aspect of the present disclosure, a corresponding method of operating an NFC device is conceived.

In some implementations, the method may include receiving an RF signal of the RF link (1, 2) by an antenna interface (12) of a primary radio device (10). In addition, the method may include performing spectral analysis with the received RF signal, where harmonics of the received signal are searched. The method may include in a case, that harmonics are detected: determining a fundamental frequency of the RF signal from a spacing of the determined harmonics. Also, the method may include classifying the RF link (1, 2) based on the determined fundamental frequency.

A radar system configured to, based on a predetermined packet interval, from which scheduled packet start times are derived separated by the predetermined packet interval, transmit at least a first and second radar packet wherein: (i) transmission of the first radar packet is delayed by a first delay time from a first scheduled packet start time, and (ii) said transmission of the second radar packet is delayed by a different, second delay time from a second scheduled packet start time, and start sampling of a received signal at a time based on said first delay time to obtain a first sampled signal; and start sampling of a received signal at a time based on said second delay time to obtain a second sampled signal; and process the first and second sampled signals to generate respective CIR information.

Systems and methods of controlling buck-boost converters are provided herein that include controllers having two delay line based compensators in series. The two delay line based compensators may include a voltage loop delay line compensator and a current loop delay line compensator. The voltage loop delay line compensator may be the first compensator and the current loop delay line compensator may be the second compensator. Each delay line based compensator may include a pre-condition stage, a pre-condition output-to-pulse conversion stage, a time difference comparison stage, a pulse to current conversion stage, and a current to voltage conversion stage.

The present disclosure provides a trusted processor configured to provide for the pairing of a subsystem leader and a subsystem follower, the trusted processor configured to: receive, from the subsystem leader, a subsystem leader identifier and a subsystem follower identifier; generate a leader pairing material transport key (PMTK); transmit the leader PMTK to the subsystem leader; and transmit a derived PMTK to the subsystem follower, wherein the derived PMTK is derived based on the received subsystem follower identifier and the leader PMTK; wherein the transmitted leader PMTK and the derived PMTK are configured to be used by the subsystem leader and the subsystem follower to securely authenticate each other and, based on this authentication, set up respective long term pairing keys for ongoing communication therebetween. The disclosure also provides for a corresponding subsystem comprising the subsystem leader and the subsystem follower.

One example discloses a wireless communications device, including: a first receiver input configured to be coupled to a first end of an antenna and a first end of a sense resistor; wherein the sense resistor is coupled in series with the antenna; a second receiver input configured to be coupled to a second end of the sense resistor; a controller configured to determine an antenna current (Iant) flowing through the antenna based on a voltage between the first receiver input and the second receiver input; wherein the controller is configured to increase the antenna current if the antenna current is below a first predetermined value; and wherein the controller is configured to decrease the antenna current if the antenna current is above a second predetermined value.

In accordance with a first aspect of the present disclosure, a vehicle access system is provided, comprising: a near field communication (NFC) front-end, wherein said NFC front-end comprises a first secure element; an access controller operatively coupled to the NFC front-end, wherein said access controller comprises a second secure element configured to verify data provided by the first secure element; wherein the first secure element and the second secure element are configured to establish a secure communication channel for transmitting said data from the first secure element to the second secure element. In accordance with further aspects of the present disclosure, a corresponding method of operating a vehicle access system is conceived, and a computer program for carrying out said method is provided.