Patent ID: 7852957

Claim:
A wireless transmitter that adaptively determines one modulation parameter from among a plurality of modulation parameters with different adaptive modulation levels based on an estimation result of propagation path conditions and performs adaptive modulation using said determined modulation parameter for each subcarrier or each subcarrier group consisting of a plurality of subcarriers, said wireless transmitter comprising: a storage part storing information indicating the adaptive modulation level of said determined modulation parameter; a difference information output part that generates and outputs difference information indicating a difference between the adaptive modulation level of the modulation parameter used for adaptive modulation in a previous frame and that of the modulation parameter used for adaptive modulation in a current frame with one bit based on the information stored in said storage part; and a frame generation part generating a frame using said output difference information as modulation information to notify a receiving side of the modulation parameter used for performing adaptive modulation of said subcarrier or said subcarrier group in the current frame.