Patent ID: 11968597
Assignee: ZAINAR, INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 8:
9. A method for calculating a time-of-arrival of a multicarrier uplink signal by a transceiver, the method comprising:
receiving the multicarrier uplink signal transmitted 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 a subcarrier reference signal, each subcarrier frequency, and a corresponding subcarrier uplink signal for the subcarrier frequency; and
adjusting the phase difference by a frequency-dependent phase offset based on the subcarrier frequency and a calibration function to generate an adjusted phase difference in a set of adjusted phase differences;

calculating a time-of-arrival of the multicarrier uplink signal based on the set of adjusted phase differences; and
transmitting the time-of-arrival of the multicarrier uplink signal to a remote server configured to calculate a location of the user device via multilateration.