Patent ID: 8577387

Claim:
A method of determining a distance estimate between a mobile device and a wireless transceiver communicating with the mobile device on at least one multi-carrier signal, the method comprising: receiving at least one multi-carrier signal; selecting at least two carrier signals from the at least one multi-carrier signal; measuring a signal characteristic of each of the at least two carrier signals; and determining the distance estimate between the mobile device and the wireless transceiver based at least partially upon the signal characteristic of each of the at least two carrier signals, wherein determining the distance estimate comprises: determining a carrier timing estimate, based at least in part upon the first-arrival time, for each of a plurality of carrier signals from the at least one multi-carrier signal; and combining the carrier timing estimates to form a multi-carrier timing estimate; wherein the signal characteristic of the at least two carrier signals from the at least one multi-carrier signal is a first-arrival time.