公开(公告)号：US11218876B2

公开(公告)日：2022-01-04

申请号：US15883785

申请日：2018-01-30

Applicant: Apple Inc.

Inventor： Shang-Te Yang ,  Xu Chen ,  Alejandro J. Marquez ,  Mohit Narang ,  Indranil S. Sen

IPC: G01S5/02 ,  H04W12/08 ,  H04W76/14 ,  H04L29/06 ,  H04W12/12

Abstract: Wireless communication between two electronic devices may be used to determine a distance between the two devices, even in the presence of an otherwise-disruptive attacker. A wireless receiver system of one device may receive a true wireless ranging signal from a first transmitting device and a false wireless ranging signal from an attacker. The wireless receiver system may correlate the wireless signals with a known preamble sequence and perform channel estimation using the result, obtaining a channel impulse response for the wireless signals. The wireless receiver system may filter the channel impulse response for the plurality of wireless signals by removing at least part of the channel impulse response due to the false wireless ranging signal while not removing at least part of the channel impulse response due to the true wireless ranging signal. The receiver system may perform a wireless ranging operation using the filtered channel impulse response.

公开(公告)号：US20200067565A1

公开(公告)日：2020-02-27

申请号：US16106354

申请日：2018-08-21

Applicant: Apple Inc.

Inventor： Xiaoming Yu ,  Alejandro J. Marquez ,  Indranil S. Sen ,  Peter M. Agboh ,  Shang-Te Yang ,  Vusthla Sunil Reddy

IPC: H04B1/7103

Abstract: Methods and apparatuses are presented to reduce multiuser interference resulting from two or more overlapping ultra wideband (UWB) transmissions by randomizing the start time of packets and/or bursts within the packets. A random offset time may be generated for a packet, and transmission of the packet may be arbitrarily delayed by that random offset time, relative to an earlier time at which the packet is prepared for transmission. A random offset time may be generated for a pulse burst within a symbol of a packet, and transmission of the burst may be delayed by that random offset time, relative to a nominal transmission window within the symbol. The burst may therefore occupy a portion of a guard period following the nominal transmission window. Either procedure, or both procedures, may be used to reduce multiuser interference between two concurrently transmitted packets by randomizing overlap occurring between the bursts.

公开(公告)号：US10158997B2

公开(公告)日：2018-12-18

申请号：US15468016

申请日：2017-03-23

Applicant: Apple Inc.

Inventor： Alejandro J. Marquez ,  Tushar R. Shah ,  Mohit Narang ,  Indranil S. Sen ,  Shang-Te Yang

IPC: H04W12/08 ,  H04L29/06 ,  H04W4/02 ,  H04L29/08

Abstract: A wireless network may include devices that wirelessly transmit and receive packets. Each packet may include a preamble, a start-of-frame delimiter, a physical layer header, a sequence of symbols between the start-of-frame delimiter and the physical layer header, and a data payload. The sequence of symbols may have a pattern that is resistant to spoofing attacks. A receiving device may have a correlator that correlates known symbols against the symbols in the sequence using overlapping three-symbol-length correlation windows. Early arrival peaks in the output of the correlator may be used to correct time stamp information in the packets and late arrival peaks corresponding to spoofed signals from an attacker may be ignored. Time stamp information may be processed to determine ranges between transmitting and receiving devices.

公开(公告)号：US20180091952A1

公开(公告)日：2018-03-29

申请号：US15619171

申请日：2017-06-09

Applicant: Apple Inc.

Inventor： Amit S. Sant ,  Alejandro J. Marquez ,  Indranil S. Sen ,  Mohit Narang ,  Shang-Te Yang

IPC: H04W4/04 ,  H04W24/08

CPC classification number: H04W4/029 ,  G01S5/00 ,  G01S5/12 ,  G01S5/14 ,  H04W4/023 ,  H04W4/024 ,  H04W4/026 ,  H04W4/33 ,  H04W64/00 ,  H04W88/02

Abstract: Methods and devices useful in performing precise indoor localization and tracking are provided. By way of example, a method includes locating and tracking, via a first wireless electronic device, a plurality of other wireless electronic devices within an indoor environment. The method also includes performing front-back detection, performing stationary node detection, performing angle of arrival (AoA) error correction, and performing field of view (FOV) filtering. Performing indoor localization and tracking of the plurality of other wireless electronic devices includes providing an indication of a physical location of the plurality of other wireless electronic devices within the indoor environment.

公开(公告)号：US20170242092A1

公开(公告)日：2017-08-24

申请号：US15050153

申请日：2016-02-22

Applicant: Apple Inc.

Inventor： Alejandro J. Marquez ,  Mohit Narang ,  Ruben Caballero ,  Indranil S. Sen ,  Shang-Te Yang

IPC: G01S3/46

CPC classification number: G01S3/46 ,  G01S3/48 ,  G01S3/50

Abstract: Systems, methods, and devices are provided to estimate angle of arrival of wireless signals. An electronic device may include two or more antennas that receive a wireless transmission. The wireless transmission includes a first frequency signal at a first frequency and a second frequency signal at a second frequency. The electronic device includes angle of arrival logic that may determine one or more angles of arrival of the wireless transmission to the electronic device using phase difference on arrival based on each of the first and second frequency signals.