1. A method of receiving a signal in a telecommunication system, the method comprising receiving ( 400 ) with one or more antennas signals transmitted by one or more transmitters using a multitude of channels, selecting ( 402 ) one or more channel pairs, each channel of each channel pair being a given distance from each other, determining ( 404 ) symbol estimates for the signals of the channels of the channel pairs, removing ( 406 ) the effect of data modulation from the signals of the channels of the channel pairs, obtaining ( 408 ) noise estimates by subtracting the signals of the channels of the channel pairs from each other, and determining ( 410 ) a noise covariance matrix for the desired channel on the basis of the obtained noise estimates.