Patent ID: 8259777

Claim:
A method of establishing an air interface communication between a base station and a mobile device, said method comprising: removing phase ambiguity from ranging signals transmitted by said mobile device and received at said base station, said removing producing differential ranging sub-carriers; and after said phase ambiguity has been removed, correlating said ranging signals with possible ranging codes, wherein said correlating comprises: multiplying said differential ranging sub-carriers with one or more local replicas of possible differential ranging codes; summing the results of said multiplying, said summing producing one or more correlation values between said local replicas and said ranging signals transmitted by said mobile device; calculating power levels of said one or more correlation values; selecting a set of correlation values from said one or more correlation values, wherein each of said selected set of correlation values have a power level that exceeds a predetermined threshold; calculating a power adjustment value for said mobile device by comparing said power levels of said selected set of correlation values with a target power; and providing to said mobile device information based on said power adjustment value.