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

Claim 12:
13. A transceiver for calculating a time-of-arrival of a multicarrier signal, the transceiver configured to:
access a 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:
calculate a phase difference between a subcarrier reference signal for the subcarrier frequency and a corresponding subcarrier uplink signal for the subcarrier frequency;
compute a frequency-dependent phase offset based on the subcarrier frequency; and
adjust the phase difference by the frequency-dependent phase offset to generate an adjusted phase difference in a set of adjusted phase differences;

calculate a time-of-arrival estimate in a set of time-of-arrival estimates based on the set of adjusted phase differences;
calculate a weighted average of the set of time-of-arrival estimates based on, for each time-of-arrival estimate in the set of time-of-arrival estimates, a pair of phase distortions associated with the pair of subcarrier frequencies for each time-of-arrival estimate;
calculate a time-of-arrival of the multicarrier uplink signal based on the set of time-of-arrival estimates based on the weighted average of the set of time-of-arrival estimates; and
transmit the time-of-arrival of the multicarrier uplink signal to a remote server.