Method for configuring feedback information to feed explicit channel state information back in wireless communication system

A terminal for transmitting a feedback signal in a wireless communication system, the terminal comprising:

• a wireless communication unit configured to transmit and receive data;
• and
• a control unit configured to control the terminal,
• wherein the control unit is further configured to:
• control the wireless communication unit to receive, from a base station, a feedback information configuration including channel component information and grouping information;
• control the wireless communication unit to receive, from the base station, a reference signal;
• perform a channel measurement between the base station and the terminal based on the reference signal;
• separate each of a plurality of channel elements of a channel obtained by the channel measurement according to components of the plurality of the channel elements based on the channel component information;
• group the plurality of the separated channel elements of the channel based on the grouping information;
• configure order sorting information associated with sorting an order of at least one channel element included in each group of the plurality of the separated channel elements;
• configure probability distribution approximation information associated with probability distribution approximating the at least one channel element included in each group of the plurality of the separated channel elements;
• and
• control the wireless communication unit to transmit feedback information including the configured order sorting information and the configured probability distribution approximation information.

A method for restoring a channel matrix by a base station configured to perform communication through a channel in a wireless communication system, the method comprising:

• transmitting, to a terminal, a feedback information configuration including channel component information and grouping information;
• receiving, from the terminal, feedback information including the configured order sorting information and the configured probability distribution approximation information;
• releasing probability distribution approximation of the channel comprising a plurality of channel elements based on the received probability distribution approximation information;
• restoring a sort order of the plurality of the channel elements based on the received order sorting information;
• releasing grouping of the plurality of channel elements based on the grouping information;
• and
• combining the plurality of channel elements based on the channel component information to restore the channel matrix.

A base station for restoring a channel matrix to perform communication through a channel in a wireless communication system, the base station comprising:

• a wireless communication unit configured to transmit and receive data;
• and
• a control unit configured to control the base station,
• wherein the control unit is further configured to:
• control the wireless communication unit to transmit, to a terminal, a feedback information configuration including channel component information and grouping information;
• control the wireless communication unit to receive, from the terminal, feedback information including the configured order sorting information and the configured probability distribution approximation information;
• release probability distribution approximation of the channel comprising a plurality of channel elements based on the probability distribution approximation information;
• restore a sort order of the plurality of channel elements based on the order sorting information;
• release grouping of the plurality of channel elements based on the grouping information;
• and
• combine the plurality of channel elements based on the channel component information to restore the channel matrix.