US 12,463,695 B2
Beam nulling method for cross-sector interference suppression
Andrei Malkov, Espoo (FI); Ulf Peter Falk, Espoo (FI); and Risto Pekka Valkonen, Espoo (FI)
Assigned to Nokia Solutions and Networks Oy, Espoo (FI)
Filed by Nokia Solutions and Networks Oy, Espoo (FI)
Filed on Apr. 3, 2025, as Appl. No. 19/169,238.
Claims priority of application No. 20245432 (FI), filed on Apr. 8, 2024.
Prior Publication US 2025/0317173 A1, Oct. 9, 2025
Int. Cl. H04B 7/06 (2006.01)
CPC H04B 7/0617 (2013.01) [H04B 7/0639 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
multiple sector antennas associated with sectors, each sector antenna of the sector antennas includes a reception array of antenna array elements and a transmission array of antenna array elements, and wherein each sector antenna is configured for transmitting signals, using the transmission array, to devices within a sector of the sectors that is associated with the sector antenna and for receiving signals, using the reception array, from devices within the sector; and
processing circuitry configured to
transform a downlink beamforming matrix into a transformed downlink beamforming matrix using a closed-form expression, wherein the transformed downlink beamforming matrix is configured to suppress both self-interference and cross-sector interference at individual receiver antenna array elements in a multi-sector antenna arrangement,
generate a predistortion matrix, generate beamformed data symbols associated with a current sector based on the transformed downlink beamforming matrix by multiplying together undistorted data symbols, the transformed downlink beamforming matrix, and the predistortion matrix, wherein the undistorted data symbols are addressed to devices associated with different sectors, and
deliver the beamformed data symbols associated with a current sector to a downlink transmit antenna included in the multi-sector antenna arrangement.