A wireless device transmits downlink interference-related information to a transmission point. The wireless device generates this information by listening to reference signals associated with a first reference signal resource as well as with a second reference signal resource. The wireless device uses these reference signals to estimate a first channel matrix relating to the first reference signal resource and a second channel matrix relating to the second reference signal resource. Using the estimated first and second channel matrices, the wireless device derives a pair of precoding matrices. Precoding matrix indicators representing the precoding matrix pair are sent to the transmission point.