Method by which base station transmits signal on basis of antenna array in wireless communication system, and apparatus therefor

A base station transmitting a signal based on an antenna array in a wireless communication system, the base station comprising:

• one or more transceivers;
• one or more processors;
• and
• one or more memories operably connectible to the one or more processors and storing instructions to, when executed by the one or more processors, perform operations, wherein
• the operations include:
• determining a multi-rank beam considering (i) positions of a plurality of user equipment (UEs) and (ii) positions of null points of a beam generated via the antenna array;
• and
• transmitting a signal to the plurality of UEs using the multi-rank beam, wherein
• the antenna array is based on a three-dimensional shape having omnidirectional symmetry, and wherein
• the positions of the null points and the positions of the plurality of UEs are set based on a polar coordinate system having a center of the antenna array as an origin thereof.