Method and receiver in a wireless communication system

A receiver for receiving a signal from a transmitter in a wireless communication system, based on Orthogonal Frequency Division Multiplexing (OFDM), the receiver comprising:

• a receiving circuit, configured to receive a plurality of signals y from the transmitter;
• and
• a processor, configured to:
• determine a group T of Resource Elements (Res), for which the Channel Estimation Error (CEE), is assumed to be constant,
• extract the determined group T of REs, from the received signals y,
• compute noise and CEE covariance matrix Rww for the extracted T REs, initialised as:
• Rww=(N0+Mσ2)I, where:
• N0 is the noise variance, M is the number of antennas, σ2 is the standard deviation of the channel estimation error and I is the identity matrix of size TM×TM, and
• compute a Minimum Mean Square Error (MMSE) filter WMMSE, based on the computed noise and CEE covariance matrix Rww and obtain an MMSE estimate {circumflex over (x)} of payload data x comprised in the received signals y, associated with the extracted T REs by applying the computed filter WMMSE to the extracted T REs of the received signal:
• {circumflex over (x)}=WMMSE y.