Patent ID: 7280504

Claim:
An OFDM transmitting and receiving apparatus which transmits and receives an OFDM signal including a plurality of subcarriers to and from a destination transmitting and receiving apparatus, the subcarriers being transmitted via respective predetermined transmission channels, comprising: a receiving unit configured to receive an OFDM signal transmitted from the destination transmitting and receiving apparatus; a computing unit configured to compute a value of a channel response characteristic of each of transmission channels corresponding to subcarriers contained in the OFDM signal received, and obtain a computed value; a comparing unit configured to compare the computed value with a predetermined threshold value, and compute a ratio of the number of the subcarriers including the value of the channel response characteristic higher than the predetermined threshold value, to the number of all the subcarriers, and obtain a computed ratio; a setting unit configured to set a transmission condition based on at least the computed ratio; and a transmitting unit configured to transmit an OFDM signal based on the transmission condition set.