Patent ID: 8619672

Claim:
A method for estimating velocity and Doppler frequency in a wireless communication system, the method comprising: using a receiver to acquire a first plurality of time-of-arrival (TOA) of forward link signals measurements from a first plurality of base stations at a first time; using the receiver to acquire a second plurality of TOA measurements of forward link signals from a second plurality of base stations at a second time; using the receiver to acquire a third plurality of TOA measurements of forward link signals from a third plurality of base stations at a third time; determining a plurality of line-of-sight (LOS) distance measurements using the first, second and third pluralities of TOA measurements; determining a plurality of velocity estimates and a plurality of angle of arrival (AOA) estimates, using the plurality of LOS distance measurements; determining a plurality of Doppler frequency estimates using the plurality of velocity estimates and the plurality of AOA estimates; and using a processor for determining an average Doppler frequency estimate and an average velocity over a plurality of sectors based on corresponding weighting factors, wherein the first, second and third pluralities of TOA measurements are acquired over the plurality of sectors; wherein the first, second and third pluralities of TOA measurements are subject to a common constraint value based on which a forward link transmit time is constantly calibrated among the first, second and third pluralities of base stations; and wherein the first plurality of base stations does not include base stations of the second and third pluralities of base stations, the second plurality of base stations does not include base stations of the first and third pluralities of base stations and the third plurality of base stations does not include base stations of the first and second pluralities of base stations.