Nxp B.v.

Broadcom Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Shengyang Xu

Abdul Wahid Abdul Kareem

Dong-U Lee

Brima Babatunde Ibrahim

Michael Schober

Radha Srinivasan

Diwakar Subraveti

Jianhua Gan

Jun Zhou

Atmaram Kota Rajaram

Manolis Frantzeskakis

Divyanshu Jain

Pablo Corbalán Pelegrín

Ajay A Jampale

A method is provided for estimating a signal's angle of arrival (AOA) in a communications system. Starting values for each of a horizontal AOA and a vertical AOA are estimated. The estimated vertical AOA starting value is used to select a horizontal PDOA trace of horizontal PDOA calibration data. The selected horizontal PDOA trace is interpolated to determine a best horizontal AOA estimate for a current iteration. The estimated horizontal AOA starting value is used to select a vertical PDOA trace of vertical PDOA calibration data. The selected vertical PDOA trace is interpolated to determine a best vertical AOA estimate for the current iteration. After each iteration, determining if a maximum number of iterations has been reached or if the best horizontal or vertical AOA estimate has not changed by a predetermined amount. When one of these is true, the best horizontal and vertical AOA estimates are used.

Method for angle of arrival estimation in an impulse-radio ultra-wideband communications system

UWB ranging methods and apparatus are disclosed. The method comprises a ranging communication with a plurality of responder devices, the ranging communication comprising: transmitting, by an initiator device, a polling signal in a time slot; receiving a respective response from each of the plurality of responder devices, overlapping and in a next time slot, each response comprising: synchronization bits, and a frame comprising Start of Frame Delimiter, and a Scrambled Timestamp Sequence; wherein the STS comprises a sequence of segments each preceded by a respective guard interval, wherein a specific one of the segments comprises data derived from a ranging key and a responder-identifier each unique to the respective responder among the plurality of responders, wherein a sequence-number of the specific segment is unique to the respective response, and wherein a remainder of the segments each comprise the same data derived from a predetermined common key and predetermined common data.

Device ranging using UWB

A method and device using a single transmitter (TX) and/or a single receiver (RX) is provided for determining an angle measurement between the transmitter and receiver for an ultra-wideband (UWB) system. A plurality of RX antennas is coupled to the receiver and a plurality of TX antennas is coupled to the transmitter. An IEEE 802.15.4z standard provides a silent period or gap before and after scrambled timestamp sequences (STS) in a frame. An active antenna is switched to a different antenna in the gaps. This allows the angle measurements to be performed with only a single transmitter and receiver within one channel impulse response (CIR) measurement cycle.

Wireless communications device and method for performing an angle measurement

In some aspects, the disclosure is directed to methods and systems for carrier synchronization in active load modulation for near field communications. A broadcast carrier is received from a remote device and mixed with a locally-generated carrier and modulated data. A carrier synchronization circuit synchronizes the locally-generated carrier with the broadcast carrier based on an identified phase error from a double Cartesian-to-polar mapping of the mixed locally-generated carrier and broadcast carrier. In some implementations, the system also includes a modulation suppression circuit for providing unmodulated carrier signals to the carrier synchronization circuit or suppressing modulation distortion to maintain frequency and phase tracking despite the presence of data.

Carrier synchronization appropriate for ALM NFC data transmission

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.

Frequency synchronization for a near field communication (NFC) device

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Irvine, CA, United States of America

Shengyang Xu