Hybrid beamforming method for beam-based cooperative transmission, and apparatus for the same

An operation method of a centralized processor (CP) for hybrid beamforming based cooperative transmission, the operation method comprising:

• generating global statistical channel state information (CSI) by collecting local statistical CSI from each of access nodes (ANs) connected to the CP;
• configuring a set of first terminals to be served by a first AN of the ANs based on the global statistical CSI;
• configuring a transmission signal space and an interference signal space for the first AN, and deriving an outer precoding matrix defining an interference-controlled transmission signal space for the first AN based on the transmission signal space and the interference signal space;
• and
• transmitting the derived outer precoding matrix to the first AN,
• wherein a radio frequency (RF) precoder of the first AN is configured based on the derived outer precoding matrix, and a digital precoder of the first AN is configured using local instantaneous effective CSI between the first AN and the first terminals.