Methods and devices for processing a data signal for transmission to multi-stream terminals

A radio transceiver, comprising:

• a precoder configured to precode a data signal for transmission to a plurality of multi-stream terminals based on a plurality of precoding weight matrices;
• and
• a processor configured to generate for each terminal in an iterative manner a precoding weight matrix and a transformed channel matrix, wherein the transformed channel matrix indicates a channel gain between the radio transceiver and the respective terminal transformed by a receive filter matrix of the respective terminal,
• wherein the generation of the precoding weight matrix and the transformed channel matrix in a current iteration is based on the transformed channel matrix generated from a previous iteration.

A radio transceiver circuit, comprising:

• a precoder configured to precode a data signal for beamforming to a plurality of terminals, wherein the precoding is based on a plurality of precoding weights;
• and
• a processor configured to generate for each terminal of the plurality of terminals a precoding weight and a channel gain between the radio transceiver and a respective terminal, wherein the channel gain is transformed by a receive filter of the respective terminal,
• wherein the generation of the precoding weight and the transformed channel gain is based on a transformed channel gain generated from a previous processing.

A method for processing a data signal for transmission to a plurality of multi-stream terminals, the method comprising:

• precoding a data signal for transmission to a plurality of multi-stream terminals based on a plurality of precoding weight matrices;
• and
• generating for each terminal in an iterative manner a precoding weight matrix and a transformed channel matrix, wherein the transformed channel matrix indicates a channel gain between a base station and the respective terminal transformed by a receive filter matrix of the respective terminal,
• wherein the generation of the precoding weight matrix and the transformed channel matrix in a current iteration is based on the transformed channel matrix generated from a previous iteration.