Patent ID: 7680064

Claim:
A wireless communication apparatus comprising: a transmitter; a receiver; an estimation unit configured to estimate a degree of channel variation; and a control unit configured to determine a modulation scheme and an error correction coding scheme used by the transmitter; wherein the control unit includes a transmission control unit configured to control the transmitter so as to transmit a first frame for requesting response information necessary to select the modulation scheme and the error correction coding scheme; a measurement unit configured to measure a response time between an instant when the transmitter transmits the first frame and an instant when the receiver receives a second frame including the response information; a threshold determination unit configured to determine a threshold value of the response time for determining reliability of the response information, based on the degree of channel variation; and a determination unit configured to determine a first set of the modulation scheme and the error correction coding scheme selected based on the response information included in the second frame received by the receiver in the response time shorter than the threshold value.