A successive interference cancellation receiver for line-of-sight multiple-input multiple-output receivers

A network node comprising a LOS-MIMO microwave radio link receiver configured for successive interference cancelation, SIC, operation, the network node comprising:

• a plurality of receiver input ports;
• and
• a pre-detection network, connected to the receiver input ports, configured to perform mutual MIMO interference cancellation for each receiver radio branch, and to output pre-detection signals—for two or more symbol streams of the LOS-MIMO receiver,
• where the pre-detection signals are fed in a SIC sequence to respective information symbol detectors of the symbol streams, where the output of each information symbol detector in the SIC sequence is arranged to be phase shifted and added to pre-detection signals yet to be fed to its respective information symbol detector,
• where the output of the information symbol detectors of the symbol streams constitutes an output of the LOS MIMO microwave radio link receiver.

A computer implemented method performed in a line-of-sight, LOS, multiple-input multiple-output, MIMO, microwave radio link receiver configured for successive interference cancelation, SIC, operation, wherein the receiver comprises a plurality of receiver input ports, the method comprising

• connecting the receiver input ports to a pre-detection network;
• performing mutual MIMO interference cancellation for each receiver radio branch, and outputting a respective pre-detection signal for two or more symbol streams;
• feeding the pre-detection signals in a SIC sequence to respective information symbol detectors of the symbol streams, where the output of each information symbol detector in the SIC sequence is phase shifted and added to pre-detection signals yet to be fed to its respective information symbol detector;
• and
• providing the output of the information symbol detectors of the symbol streams as an output of the LOS MIMO microwave radio link receiver.