US 11,968,597 B2
Systems and methods for multicarrier phase-based localization
Jonathan Lu, Redwood City, CA (US); Mainak Chowdhury, Redwood City, CA (US); and Philip A. Kratz, Redwood City, CA (US)
Assigned to ZaiNar, Inc., Redwood City, CA (US)
Filed by ZaiNar, Inc., Redwood City, CA (US)
Filed on Aug. 4, 2022, as Appl. No. 17/881,449.
Application 17/881,449 is a continuation of application No. 17/379,885, filed on Jul. 19, 2021, granted, now 11,445,333.
Claims priority of provisional application 63/152,780, filed on Feb. 23, 2021.
Claims priority of provisional application 63/053,509, filed on Jul. 17, 2020.
Prior Publication US 2023/0014896 A1, Jan. 19, 2023
Int. Cl. H04W 4/029 (2018.01); G01S 5/02 (2010.01); G01S 5/10 (2006.01); H04L 5/00 (2006.01); H04W 56/00 (2009.01); H04W 64/00 (2009.01)
CPC H04W 4/029 (2018.02) [G01S 5/021 (2013.01); G01S 5/0284 (2013.01); G01S 5/10 (2013.01); H04L 5/0007 (2013.01); H04L 5/0051 (2013.01); H04L 5/0053 (2013.01); H04W 56/001 (2013.01); H04W 64/00 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for calculating a time-of-arrival of a multicarrier uplink signal, the method comprising:
for each transceiver in a set of transceivers:
receiving the multicarrier uplink signal from a user device, the multicarrier uplink signal comprising a subcarrier uplink signal for each subcarrier frequency in a set of subcarrier frequencies;
for each subcarrier frequency in the set of subcarrier frequencies:
calculating a phase difference between the subcarrier uplink signal for the subcarrier frequency and a corresponding subcarrier reference signal for the subcarrier frequency;
computing a phase offset based on the subcarrier frequency; and
generating an adjusted phase difference, in a set of adjusted phase differences, based on a combination of the phase difference and the phase offset; and
calculating a time-of-arrival estimate, in a set of time-of-arrival estimates, based on a pair of adjusted phase differences, in the set of adjusted phase differences, corresponding to a pair of subcarrier frequencies in the set of subcarrier frequencies; and
calculating the time-of-arrival of the multicarrier uplink signal based on the set of time-of-arrival estimates.