US 11,812,403 B2
Active geo-location for orthogonal frequency division multiplex wireless local area network devices using additive correlation
Olivia Turner, Pompano Beach, FL (US); Ryan Busser, Fort Lauderdale, FL (US); and Graham K. Smith, Boca Raton, FL (US)
Assigned to SR Technologies, Inc., Sunrise, FL (US)
Filed by SR Technologies, Inc., Sunrise, FL (US)
Filed on May 15, 2023, as Appl. No. 18/317,392.
Application 18/317,392 is a continuation of application No. 17/319,902, filed on May 13, 2021, granted, now 11,683,778.
Claims priority of provisional application 63/074,852, filed on Sep. 4, 2020.
Prior Publication US 2023/0292279 A1, Sep. 14, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 64/00 (2009.01); H04L 43/0864 (2022.01)
CPC H04W 64/00 (2013.01) [H04L 43/0864 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method in a wireless device (WD) for determining a geo-location of a target station using round-trip times (RTTs) of a plurality of signals transmitted by the WD to the target station and a plurality of response signals received from the target station corresponding to the plurality of signals transmitted by the WD, each response signal having a response signal type and including a set of samples and a set of bits, the method comprising:
for each transmitted signal of the plurality of signals:
determining that the response signal type of the corresponding response signal matches an expected response signal type based on at least a subset of the set of samples, the expected response signal type corresponding to an expected response signal comprising a set of expected samples and a set of expected bits;
correlating at least a subset of bits of the set of bits of the response signal with the set of expected bits of the expected response signal, the correlation of at least the subset of bits generating a plurality of correlation outputs;
summing the correlation outputs corresponding to a set number of signals of the plurality of signals, at least the set number of signals being transmitted in a burst by the WD; and
determining the RTT based at least in part on a peak of the sum of the correlation outputs, the determined RTT being usable to determine the geo-location of the target station.