Patent ID: 11864150
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 11:
12. A method implemented in a network node to estimate a time difference of arrival, TDoA, of signals received from a wireless device, the method comprising:
employing a coordinated multipoint process to decode data from a WD using signals received from the WD by the network node and from signals received from the WD by a plurality of cooperating network nodes;
converting the decoded WD data into a frequency domain reference signal and converting the signals received from the plurality of cooperating network nodes into frequency domain neighbor signals;
multiplying a complex conjugate of the frequency domain reference signal by each of the plurality of frequency domain neighbor signals to produce a plurality of product signals;
converting each of the product signals into a time domain signal to provide a time difference of arrival of each frequency domain neighbor signal; and
calculating a position of the WD based on the time difference of arrival of each frequency domain neighbor signal and based on locations of the cooperating network nodes.