Patent ID: 6990318

Claim:
A multi-carrier communication apparatus which communicates between a first station and a second station as a destination station using a reference signal used for estimating a state of a channel, the multi-carrier communications apparatus comprising: a multi-carrier modulator which modulates data on a plurality of subcarriers; a transmission unit configured to transmit the reference signal together with the data modulated to the destination station on every subcarrier; and a control unit configured to control a reference signal transmission pattern according to a given communication condition, the reference signal transmission pattern including a transmission interval of the reference signal transmitted by the transmission unit; wherein the control unit is further configured to control the reference signal transmission pattern according to at least one of a communication quality in transmitting data to the destination station, a response of the channel, and a degradation degree of the reference signal; and wherein the destination station includes a detection unit configured to detect at least one of the transmission quality, the response, and the degradation degree of the reference signal, and a transmitter which transmits at least one of the transmission quality, the response and the degradation degree of the reference signal to the control unit.