Interference-aware dimension reduction via orthonormal basis selection

A network node configured to perform interference-aware dimension reduction, the network node comprising processing circuitry configured to:

• determine a beamformer for each of a plurality of wireless devices, WDs, each beamformer being based at least in part on an interference covariance matrix of interference plus noise;
• determine a power in each dimension reduction basis vector of a plurality of dimension reduction basis vectors based at least in part on the determined beamformers;
• select a subset of the dimension reduction basis vectors, the selecting being based at least in part on the determined powers, a number of selected dimension reduction basis vectors being less than a number of antenna elements of the network node;
• and
• multiply a received signal vector by a dimension reduction matrix, the received signal vector having a dimension equal to the number of antenna elements of the network node, the dimension reduction matrix having as rows the selected subset of the dimension reduction basis vectors, the multiplying resulting in a reduced signal vector having a dimension equal to the number of selected rows of the dimension reduction matrix.

A non-transitory computer storage medium storing thereon a computer program configured to perform a method when executed, the method comprising:

• determining a beamformer for each of a plurality of wireless devices, WDs, each beamformer being based at least in part on an interference covariance matrix of interference plus noise;
• determining a power in each dimension reduction basis vector of a plurality of dimension reduction basis vectors based at least in part on the determined beamformers;
• selecting a subset of the dimension reduction basis vectors, the selecting being based at least in part on the determined powers, a number of selected dimension reduction basis vectors being less than a number of antenna elements of the network node;
• and
• multiplying a received signal vector by a dimension reduction matrix, the received signal vector having a dimension equal to the number of antenna elements of the network node, the dimension reduction matrix having as rows the selected subset of the dimension reduction basis vectors, the multiplying resulting in a reduced signal vector having a dimension equal to the number of selected rows of the dimension reduction matrix.