Patent ID: 7619963

Claim:
An OFDM signal frame generator, comprising: rate determining means for determining rate information to generate a signal frame to be transmitted as an OFDM signal, the rate information being determined based on a value of a received signal quality of an OFDM signal that was received by a receiver, the value of the received signal quality being transmitted from the receiver to the generator; pilot & data arrangement format determining means for determining a pilot & data arrangement format including a number of sub-carriers used of the OFDM signal that is to be transmitted, based on the value of the received signal quality, the pilot & data arrangement format determining means reducing the number of sub-carriers if the received signal quality is below a certain level; pilot symbol number determining means for determining a number of pilot symbols for the signal frame of the OFDM signal that is to be transmitted, based on the value of the received signal quality; power amplification rate determining means for determining a power amplification rate for the signal frame of the OFDM signal that is to be transmitted, based on the value of the received signal quality; data symbol generating means for generating data symbol series to be transmitted with said signal frame of the OFDM signal, and the data symbol series being generated based on said rate information; and transmission signal frame generating means for generating the signal frame of the OFDM signal that is to be transmitted, based on the generated data symbol series, the number of pilot symbols, and the power amplification rate.