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 |
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.
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