A method for determining estimated values for data symbols transmitted from at least four transmission antennas of a MIMO transmission system, which are encoded according to the Matrix B transmission mode and weighted with coefficients (vi). The method including determining hypotheses ({tilde over ({right arrow over (s)}1-4, {tilde over ({right arrow over (s)}5-8) for the transmitted data symbols ({right arrow over (s)}1-4, {right arrow over (s)}5-8) from data symbols ({right arrow over (r)}1-4, {right arrow over (r)}5-8) received from at least two reception antennas, weighted with hypotheses ({tilde over (h)}nm) for the transmission factors (hnm) associated with a partial transmission channel, between a transmission antenna m and a reception antenna n, and with hypotheses ({tilde over (v)}i) for the coefficients (vi), determining a metric for each hypothesis ({tilde over ({right arrow over (s)}1-4, {tilde over ({right arrow over (s)}5-8) associated with at least one transmitted data symbol ({right arrow over (s)}1-4, {right arrow over (s)}5-8) and determining the estimated value ({tilde over ({right arrow over (s)}1-4, {tilde over ({right arrow over (s)}5-8) for the respective, transmitted data symbol ({right arrow over (s)}1-4, {right arrow over (s)}5-8) from the lowest metric associated with each hypothesis ({circumflex over ({right arrow over (s)}1-4, {circumflex over ({right arrow over (s)}5-8).