Detection of weak users in beam selection for massive MIMO receiver

A receiver arrangement for a radio access network the receiver arrangement being configured to receive a plurality of antenna signals from a plurality of antennas, the plurality of signals being collected to form a collected signal, the receiver arrangement being further configured to:

• transform the collected signal into beam space based on a transform base, to provide a set of beams;
• select a subset of beams from the set of beams;
• evaluate the subset of beams for a quality requirement;
• and
• if evaluating results in the quality requirement not being fulfilled, one of:
• changing the subset of selected beams and returning to evaluating;
• and
• changing the transform base and return to transforming.

A non-transitory computer storage medium storing computer program instructions that when executed cause processing circuitry to at least one of control and perform a method of operating a receiver arrangement in a radio access network, the receiver arrangement being configured to receive a plurality of antenna signals from a plurality of antennas, the plurality of signals being collected to form a collected signal, the method comprising:

• transforming the collected signal into beam space based on a transform base, to provide a set of beams;
• selecting a subset of beams from the set of beams;
• evaluating the subset of beams for a quality requirement;
• and
• if evaluating results in the quality requirement not being fulfilled, one of:
• changing the subset of selected beams and returning to evaluating;
• and
• changing the transform base and return to transforming.