Low Overhead Feedback Scheme for Codebook Based Closed-Loop Mimo

A method for transmitting data of a base station considering adaptive feedback mode in a multi-cell wireless communication system, the method comprising:

• receiving feedback information including diagonal values of a second matrix and information of a first precoder from a mobile station;
• recovering a first matrix using the diagonal values;
• obtaining a second precoder using the recovered first matrix and the first precoder;
• and
• transmitting data precoded with the second precoder to the mobile station,
• wherein the second matrix is determined by approximation using the first matrix and a Fourier matrix in the mobile station.

A mobile station that supports codebook based adaptive feedback mode in a multi-cell wireless communication system, the mobile station comprising:

• a processor;
• and
• a radio frequency (RF) module for transmitting and receiving a radio signal to and from the outside under the control of the processor,
• wherein the processor is configured to:
• measure a channel between the mobile station and a serving base station using a signal received from the serving base station;
• determine a first matrix indicating channel state information and a first precoder using the measured channel;
• generate a second matrix using a Fourier matrix and the first matrix;
• and
• control the RF module to transmit feedback information including at least one of information of the first precoder and diagonal values of the second matrix to the serving base station.