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

Claim 0:
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.