Wireless transmission method, and wireless transmitter and wireless receiver

A wireless transmitter capable of transmitting a data stream to a wireless receiver, the wireless transmitter comprising:

• a plurality of transmitting antennas;
• and
• a scheduler controls to increase the number of transmission beams to be formed for transmitting said data stream depending on the number of data streams to be transmitted from said transmitting antennas becoming small,
• wherein said transmission beams are formed by predetermined number of the plurality of transmitting antennas.

A wireless receiver capable of receiving a data stream from a wireless transmitter having a plurality of transmitting antennas, the wireless receiver comprising:

• a receiving antenna;
• and
• a receiver that receives anyone or more transmission beam through said receiving antenna from the transmission beams of which number of transmission beams to be formed for transmitting said data stream is controlled depending on the number of data streams to be transmitted by said wireless transmitter,
• wherein said transmission beams are formed by predetermined number of the plurality of transmitting antennas.

A wireless communication method for transmitting a data stream between a wireless transmitter having a plurality of transmitting antennas and a wireless receiver, the wireless communication method comprising:

• multiplexing, by the wireless transmitter, a pilot signal for each of the transmitting antennas to perform beam transmission by a weighting coefficient;
• determining, by the wireless receiver, a number of transmission data streams;
• and
• reporting information regarding the number of the transmission data streams to the wireless transmitter from the wireless receiver,
• wherein the transmission data streams are transmitted by predetermined number of the plurality of transmitting antennas.

A wireless communication system including a wireless transmitter and a wireless receiver capable of performing data transmission by Multiple-Input Multiple-Output (MIMO), the wireless communication system comprising:

• wherein
• the wireless transmitter includes
• a beam former which forms a transmission beam by weighing a coefficient;
• and <a multiplexer which multiplexes a pilot signal for each of the transmitting antennas;
• and
• the wireless receiver includes
• a determiner which determines a number of transmission streams;
• and
• a transmitter which transmits information regarding the number of the transmission data streams to the wireless transmitter,
• wherein the transmission data streams are transmitted by predetermined number of the plurality of transmitting antennas.