US 11,747,429 B2
Differential matched summed positioning
Roland Smith, Nepean (CA); Miguel Berg, Sollentuna (SE); Satyam Dwivedi, Solna (SE); and Mike Skof, Nepean (CA)
Assigned to TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
Appl. No. 17/295,197
Filed by TELEFONAKTIEBOLAGET LM ERICSSON (PUBL), Stockholm (SE)
PCT Filed Dec. 13, 2019, PCT No. PCT/IB2019/060791
§ 371(c)(1), (2) Date May 19, 2021,
PCT Pub. No. WO2020/128760, PCT Pub. Date Jun. 25, 2020.
Claims priority of provisional application 62/782,086, filed on Dec. 19, 2018.
Prior Publication US 2022/0011394 A1, Jan. 13, 2022
Int. Cl. H04W 24/00 (2009.01); G01S 5/02 (2010.01); G01S 5/06 (2006.01); H04L 5/00 (2006.01); H04L 25/02 (2006.01); H04W 64/00 (2009.01)
CPC G01S 5/0218 (2020.05) [G01S 5/06 (2013.01); H04L 5/0051 (2013.01); H04L 25/0206 (2013.01); H04W 64/003 (2013.01); G01S 2205/01 (2020.05)] 28 Claims
OG exemplary drawing
 
1. A network node configured to communicate with a wireless device (WD), the network node comprising:
at least one processor; and
a memory including computer readable software instructions configured to control the at least one processor to implement steps of:
summing sequential uplink data signals at each of a plurality of antennas of the network node to produce a plurality of antenna signal sums;
selecting one of the antenna signal sums to be used as a reference antenna signal sum;
determining a channel impulse response for each of a plurality of other antennas based on the reference antenna signal sum and the others of the plurality of antenna signal sums;
estimating a time difference of arrival from the channel impulse responses of the plurality of antennas;
estimating an error of the estimated time difference of arrival of each antenna; and
calculating a position of a wireless device using the estimated time differences of arrival.