Patent ID: 8774066

Claim:
A method for interference calibration at a network interface of a first communication system, the method comprising: communicating with a first mobile terminal in a downlink channel in a first communication system; receiving timing information from a second mobile terminal in an uplink channel of a second communication system; estimating the uplink channel in the second communication system using the timing information to form a channel estimation; computing one or more interference alignment (IA) filters based on the channel estimation; and adjusting the downlink channel to the first mobile terminal in the first communication system by calibrating the downlink channel to not interfere with the second mobile terminal in the second communication system by applying at least one of the one or more computed IA filters to one or more downlink communications with the first mobile terminal, wherein the second mobile terminal communicates in an uplink and a downlink channel with one or more base stations of the second communication system but does not communicate in a downlink channel with any base stations belonging to the first communication system.