Patent ID: 11889459
Assignee: TECHNISCHE UNIVERSITEIT DELFT
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 3:
4. Method for determining a distance and/or a frequency offset between a first node and an second node in a wireless network, the method comprising:
the first node transmitting request messages based on carrier signals at different carrier frequencies to the second node and receiving for each of the request signals, a time series of response messages from the second node, wherein for each of the request messages the time series of response messages being transmitted based on one of reference carrier signals, each one of the reference carrier signals being transmitted at one of reference carrier frequencies by the second node to the first node, wherein the carrier frequencies and the reference carrier frequencies form frequency channels between the first node and the second node;
the first node receiving first phase differences from the second node, each of the first phase differences defining a difference between a phase of one the carrier signals and a phase of one of the reference carrier signals at a predetermined time instance associated with one of first request messages, the frequency of the one of the carrier signals and the frequency of the one of the reference carrier signals being in the same frequency channel;
the first node determining second phase differences based on the request signals and the response messages, the determining of the second phase differences including computing for each one of the carrier signals phase differences, each of the phase differences defining a difference between a phase of one of the reference carrier signals and a phase of one of the carrier signals at a predetermined time instance associated with one of the time series of response messages; and,
the first node and/or the second node or a further node determining a distance and/or a frequency offset between the first node and the second node based on the first phase differences and the second phase differences.