Estimates of carrier signal power S and interference-noise NI at the output of the equalizer in a wireless communication system is obtained by (i) determining the variance, σZ2, of the noise at the output of the equalizer dependent upon the equalization matrix, WH and an estimate of the variance σ2 of the noise at the receiving antennas, (ii) determining the interference, σI2, at the output of the equalizer dependent upon the equalization matrix, WH, a transfer function matrix, H, of transmission paths between transmitting antennas and receiving antennas, and an estimate σX2 of the variance of the transmitted signals and (iii) determining the power, S, of the carrier signal at the output of the equalizer dependent upon WH, H and σX2. The estimate of the interference-noise NI is calculated as NI=σI2+σZ2. These values may be used to facilitate adaptation of the wireless communication system.