US 11,722,171 B2
Device ranging using UWB
Diwakar Subraveti, Bangalore (IN); Abdul Wahid Abdul Kareem, Irvine, CA (US); Shengyang Xu, Irvine, CA (US); Atmaram Kota Rajaram, Bengaluru (IN); and Ajay A Jampale, Bengaluru (IN)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on Nov. 18, 2021, as Appl. No. 17/455,437.
Claims priority of application No. 202011055234 (IN), filed on Dec. 18, 2020.
Prior Publication US 2022/0200656 A1, Jun. 23, 2022
Int. Cl. H04B 1/7176 (2011.01); H04B 1/7183 (2011.01)
CPC H04B 1/7176 (2013.01) [H04B 1/7183 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An Ultra Wide Band (UWB) ranging method comprising 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:
a preamble comprising synchronization bits,
a start of frame delimiter (SFD),
and a scrambled time-stamp sequence (STS);
wherein the STS comprises a sequence of segments each preceded by a respective guard interval,
wherein a specific segment of the sequence of segments comprises data derived from a ranging key and a responder-identifier unique to each responder of the plurality of responder devices,
wherein a sequence-number of the specific segment is unique to the respective response, and
wherein a remainder of the sequence of segments each comprise identical data.