Patent ID: 7206583
Filing Date: 2007-04-17
Classification: H04B,H04W

Abstract:
1. A method of suppressing co-channel interference in a mobile station when used in a wireless cellular communications system including at least a home base station and a remote base station both using the same transmit frequency, the method comprising the following steps: receiving a signal transmitted from the home base station, setting a receive frequency of the mobile station to the transmit frequency of the home base station, and, if a signal from a remote base station is received, performing the following steps: determining a synchronisation time for the received signal from the home base station, determining a synchronisation time for the received signal from the remote base station, determining the time difference between the synchronisation time for the received signal from the home base station and the synchronisation time for the received signal from the remote base station, and using the time difference in a process suppressing the received signal from the remote base station, wherein the process suppressing the received signal from the remote base station is performed by the mobile station, wherein: the synchronisation times for the received signals are determined by estimating their respective times of arrival at the mobile station; the synchronisation time for the received signal from the home base station is determined using a short-term correlation over the signal from the home base station; and the synchronisation time for the received signal from the remote base station is determined using a long-term correlation over the signal from the remote base station.