Device and method of feedbacking channel information

PURPOSE: A device and a method of feed backing channel information for an MIMO communication system are provided to process estimated values for downlink channels due to the use of spreading sequences to generate feedback information, thereby increasing use efficiency of uplink wireless resources. CONSTITUTION: A terminal recognizes downlink channels(S910). If a necessary feedback technique is a digital feedback technique, the terminal generates index information corresponding to the downlink channels(S920,S960). If the necessary feedback technique is an analog feedback technique, the terminal generates spreading sequences for processing the channel information(S930). The terminal generates feedback information(S940). The terminal provides the feedback information to a base station(S950).