Interference rejection combining for multi-user mimo telecommunications system

A wireless terminal comprising an antenna configured to receive a received signal y which is obtained over a wireless interface in a Multiple-Input Multiple-Output, MIMO, system, characterized by:

• a signal processor configured to uselhe received signal y to make a symbol estimate ŝi of a symbol included in a transmitted signal intended for the wireless terminal, the signal processor comprising:
• a memory configured to store at least a subset of precoding matrices W which are candidates for use in transmission of an interfering signal in the MIMO system;
• a covariance matrix generator configured to use the received signal and plural candidates of the subset to determine corresponding plural covariance matrices, each of the plural covariance matrices being formed by the covariance matrix generator using a corresponding candidate precoding matrix;
• a trace checker function configured to determining which of the candidates is a trace minimizing candidate which is associated with one of the plural covariance matrices that has a minimum trace value;
• a weighting matrix generator configured to form a weighing matrix using the trace minimizing candidate;
• a symbol estimator configured to use the weighting matrix to make the symbol estimate.