公开(公告)号：US20190387019A1

公开(公告)日：2019-12-19

申请号：US16558441

申请日：2019-09-03

Applicant: Apple Inc.

Inventor： Mingguang Xu ,  Mithat C. Dogan ,  Yakun Sun ,  Rohit U. Nabar

IPC: H04L29/06 ,  H04B17/27 ,  H04L25/02

Abstract: This disclosure relates to techniques for performing secure ranging wireless communication. A first wireless device may receive a ranging packet from a second wireless device in a wireless manner. The ranging packet may include a first random sequence portion and a second random sequence portion. The first wireless device may perform one or more channel and noise estimations for the ranging packet. The first wireless device may perform one or more security checks for the ranging packet based on any or all of the first random sequence portion, the second random sequence portion, or the channel and noise estimation(s).

公开(公告)号：US20190037549A1

公开(公告)日：2019-01-31

申请号：US15937365

申请日：2018-03-27

Applicant: Apple Inc.

Inventor： Mingguang Xu ,  Su Khiong Yong ,  Mithat C. Dogan ,  Rohit U. Nabar ,  Qi Wang ,  Kyle C. Brogle ,  Andrew J. Ringer

IPC: H04W72/04 ,  H04W64/00

Abstract: Communicating wireless devices collaborate and utilize waveforms to enable secure channel estimation. To protect against a repetitive replay attack, some embodiments include Single Carrier Physical Layer (SC-PHY) waveforms and/or interpolated OFDM waveforms that do not include a repeatable or predictable structure. The waveforms are transmitted in ranging packet structures that are compatible with legacy 802.11 technologies that do not utilize secure channel estimation. The ranging packets are received in combination with the information previously exchanged to enable the receiving wireless system to securely determine a channel estimate (e.g., determine a channel estimate without an interloper transmission that is not an authentic first arrival path in a multi-path channel between the wireless systems). Thus, one or both of the wireless systems can estimate the distance between them (or range). Devices utilizing legacy 802.11 technologies may receive the ranging packet structures and determine durations for deferring access to the channel.