Patent ID: 7623610

Claim:
A method of determining a phase modulation sequence of a downlink synchronization code sent by a base station, comprising steps of: (a) measuring a phase of a received downlink synchronization code, and (b) removing an impact of a phase drift caused by a frequency offset between the base station and a local oscillator thereof on the phase of the received downlink synchronization code, so that the phase modulation sequence of the downlink synchronization code sent by the base station is determined, wherein the step (b) comprises steps of: (b.1) measuring a frequency offset between the base station and a local oscillator thereof by a receiver, (b.2) estimating a phase drift caused by the frequency offset, and (b.3) subtracting the phase drift from the phase of the received downlink synchronization code, so that the phase modulation sequence of a downlink synchronization code sent by the base station is determined.