Patent ID: 8289869

Claim:
A wireless communication system which includes a transmitter and a receiver each having two or more antennae, the system comprising: a channel condition determining unit which determines a condition of a channel between the transmitter and the receiver; and a system control unit which changes an antenna transmitting weight matrix that weights each antenna of a transmitting system in the transmitter and an antenna receiving weight matrix that weights each antenna of a receiving system in the receiver in accordance with a determination result obtained by the channel condition determining unit, wherein the channel condition determining unit calculates one of a determinant of a channel matrix and a rank of an eigenvalue estimated between the transmitter and the receiver to determine a number of streams to be used for communication and a modulating system to be used for communication, the system control unit adopts both a transmitting and a receiving system based on a linear area equalization algorithm when communication is established with the number of streams and modulating system within the determination result obtained by the channel condition determining unit, and the system control unit cancels adaptation of the transmitting system based on a linear area equalization algorithm and adopts a receiving system based on a non-linear area equalization algorithm when communication is established with the number of streams and modulating system outside of the determination result of the channel condition determining unit, and the receiver returns a response packet with NonValid Sounding when a link adaptation request is received from an M-antenna transmitter in which the number of the streams is specified.