Method and apparatus for channel state information feedback in communication system

A method of a base station, comprising:

• transmitting a reference signal to a terminal;
• receiving, from the terminal, structured channel state information (CSI) including a first latent vector and second latent vectors based on the reference signal;
• generating common CSI for resource regions by restoring the first latent vector through an artificial neural network;
• generating per-resource region CSI for each of the resource regions by restoring the second latent vectors through the artificial neural network;
• and
• constructing channel information for each of the resource regions using the common CSI and the per-resource region CSI.

A terminal comprising a processor,

• wherein the processor causes the terminal to perform:
• receiving a reference signal from a base station;
• generating a first latent vector based on the reference signal by using an artificial neural network, the first latent vector being common channel state information (CSI) for M resource regions, and M being a positive integer;
• generating a second latent vector based on the reference signal by using the artificial neural network, the second latent vector being per-resource region CSI for each of the M resource regions;
• and
• transmitting structured CSI including the first latent vector and the second latent vectors to the base station.