Method and apparatus for communication based on common feedback information in multiple antenna system

A method for a receiving side device to transmit feedback information in a wireless communication system, the method comprising:

• receiving rank Ni signals from a transmitting side device with a first type multiple antenna transmission scheme at a first receiving opportunity;
• receiving rank Nj signals from the transmitting side device with a second type multiple antenna transmission scheme at a second receiving opportunity, wherein Ni>Nj;
• and
• transmitting feedback information to the transmitting side device,
• wherein the first type multiple antenna transmission scheme uses the second type multiple antenna transmission scheme for transmission of rank Nj signals among the rank Ni signals received at the first receiving opportunity, and
• wherein the feedback information comprises a combination of a first feedback information for the rank Ni signals and a second feedback information for the rank Nj signals.

An transmitting side device for transmitting signals in a wireless communication system, the device comprising:

• multiple antennas;
• a RF unit in connection with the multiple antennas;
• and
• a processor connected to the RF unit and configured to control the RF unit to transmit rank Ni signals with a first type multiple antenna transmission scheme, and to transmit rank Nj signals with a second type multiple antenna transmission scheme, and to receive feedback information from a receiving side device,
• wherein Ni>Nj, wherein the first type multiple antenna transmission scheme uses the second type multiple antenna transmission scheme for transmitting rank Nj signals among the rank Ni signals at a transmission of the rank Ni signals, and
• wherein transmitting independent Nj signals is based on a consideration of a part of the feedback information received in response to the previously transmitted rank Ni signals.

A receiving side device for transmitting feedback information in a wireless communication system, the device comprising:

• a RF unit receiving rank Ni signals from a transmitting side device with a first type multiple antenna transmission scheme, and receiving rank Nj signals from the transmitting side device with a second type multiple antenna transmission scheme, wherein Ni>Nj;
• and and transmitting feedback information to the transmitting side device, wherein the first type multiple antenna transmission scheme uses the second type multiple antenna transmission scheme for transmission of rank Nj signals among the rank Ni signals;
• and
• a processor connected to the RF unit and configured to construct the feedback information to comprise a combination of a first feedback information for the rank Ni signals and the rank Nj signals.