A method in a first base station in a communications network for performing channel estimation of a first wireless channel between a first wireless device and the first base station. A signal comprising a first component is received over the first wireless channel, the first component corresponding to a first reference signal transmitted by the first wireless device to the first base station, and a second component, wherein at least part of the second component corresponds to a second reference signal transmitted by a second wireless device to a second base station. Also, receiving scheduling information according to which the second wireless device is scheduled to transmit the second reference signal to the second base station; generating, a constructed reference signal representative of the second reference signal; and performing channel estimation of the first wireless channel between the first wireless device and the first base station.