Multiple-input multiple-output communication method and multiple-input multiple-output communication system of enabling the method

A terminal device comprising:

• a channel information generator to generate channel information about a channel that is formed between the terminal device and a base station, according to a number of at least one active antennas, wherein the at least one active antenna is selected from a plurality of transmitting antennas of the base station based on a power of a transmission signal of the base station;
• a channel information feedback unit to feed back the channel information to the base station;
• and
• a transmission signal receiver to receive the transmission signal transmitted from the at least one active antenna based on the channel information.

A MIMO communication method comprising:

• determining a number of active antennas among a plurality of transmitting antennas based on a power of a transmission signal, wherein the number of active antennas is at least one and the at least one active antenna transmits the transmission signal;
• generating the transmission signal corresponding to the number of active antennas using channel information fed back from each of a plurality of user terminals;
• and
• switching on or off the at least one active antenna among the transmitting antennas.

A method of receiving a transmission signal, the method comprising:

• generating channel information about a channel that is formed between a terminal device and a base station based on a number of active antennas, wherein at least one active antenna is selected by the base station based on a power of a transmission signal;
• feeding back the channel information to the base station;
• and
• receiving the transmission signal that is transmitted from the at least one active antenna according to the channel information.

A base station for use in a Multiple-Input Multiple-Output (MIMO) communication system, the base station comprising:

• a plurality of antennas to communicate with a plurality of user terminals;
• a beam generator to generate a transmission signal based on channel information received from the plurality of user terminals;
• and
• an antenna selector to select at least one of the plurality of antennas to transmit the transmission signal based on the power of the transmission signal.