Abstract: A multi-user MIMO receiver of a UE in question for detecting a pre-coded signal includes a unit configured to blindly estimate information concerning a pre-coding vector for a paired UE, which is operated on the same resource as the multi-user MIMO receiver, based on received data. Further, the multi-user MIMO receiver comprises an equalizer configured to equalize the pre-coded signal based on the estimated information concerning the pre-coding vector for the paired UE.

Abstract: A multi user receiver configured to receive a signal including multiple symbol streams assigned to various users is described. The multiple symbol streams include at least one first symbol stream assigned to a user of the multi user receiver and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the at least one second symbol stream is unknown at the multi user receiver. The multi user receiver includes a symbol stream election unit configured to elect a symbol stream of the multiple symbol streams, an equalizer configured to provide an equalized symbol of the elected symbol stream, and a detector configured to generate a detected symbol from the equalized symbol on the basis of a constellation, wherein, if the second symbol stream is elected, the constellation is a mixed constellation including constellation points of at least two of multiple predefined modulation alphabets.

Abstract: An apparatus for decoding a received signal is provided. The received signal has been transmitted by conducting a transmission. The apparatus for decoding includes a detector and a filter application unit. The detector is configured to detect whether the transmission is a SU-MIMO transmission or a MU-MIMO transmission. The filter application unit is configured to apply either a first receive filter or a second different receive filter on the received signal depending on whether the transmission is the SU-MIMO transmission or the MU-MIMO transmission.

Abstract: An apparatus for determining a target precoding matrix from a plurality of precoding matrix candidates is provided. The apparatus includes a covariance matrix value provider, a real part determiner and a precoding matrix determiner. The precoding matrix determiner is adapted to determine the target precoding matrix from the plurality of precoding matrix candidates, wherein the precoding matrix determiner is configured to determine the target precoding matrix based on at least one of the one or more real covariance values.

Abstract: A multi user receiver configured to receive a signal including multiple symbol streams assigned to various users is described. The multiple symbol streams include at least one first symbol stream assigned to a user of the multi user receiver and at least one second symbol stream assigned to another user, wherein a modulation alphabet applied for the at least one second symbol stream is unknown at the multi user receiver. The multi user receiver includes a symbol stream election unit configured to elect a symbol stream of the multiple symbol streams, an equalizer configured to provide an equalized symbol of the elected symbol stream, and a detector configured to generate a detected symbol from the equalized symbol on the basis of a constellation, wherein, if the second symbol stream is elected, the constellation is a mixed constellation including constellation points of at least two of multiple predefined modulation alphabets.

Abstract: An apparatus for determining a target precoding matrix from a plurality of precoding matrix candidates is provided. The apparatus includes a covariance matrix value provider, a real part determiner and a precoding matrix determiner. The precoding matrix determiner is adapted to determine the target precoding matrix from the plurality of precoding matrix candidates, wherein the precoding matrix determiner is configured to determine the target precoding matrix based on at least one of the one or more real covariance values.

Abstract: An apparatus for decoding a received signal is provided. The received signal has been transmitted by conducting a transmission. The apparatus for decoding includes a detector and a filter application unit. The detector is configured to detect whether the transmission is a SU-MIMO transmission or a MU-MIMO transmission. The filter application unit is configured to apply either a first receive filter or a second different receive filter on the received signal depending on whether the transmission is the SU-MIMO transmission or the MU-MIMO transmission.

Abstract: A multi-user MIMO receiver of a UE in question for detecting a pre-coded signal includes a unit configured to blindly estimate information concerning a pre-coding vector for a paired UE, which is operated on the same resource as the multi-user MIMO receiver, based on received data. Further, the multi-user MIMO receiver comprises an equalizer configured to equalize the pre-coded signal based on the estimated information concerning the pre-coding vector for the paired UE.