Patent ID: 7646820

Claim:
A transmission apparatus used in a radio communication system adopting the OFDM scheme, the transmission apparatus comprising: a dividing inverse Fourier transform part including plural transform parts, wherein the dividing inverse Fourier transform part divides a signal to be transmitted into plural signal groups, and each of the plural transform parts performs inverse Fourier transform on one of the plural signal groups; a peak control part configured to output a peak control signal that is obtained using a peak position that is detected for each output signal group output from the dividing inverse Fourier transform part; and a peak reducing process part configured to apply a weight to an output signal group output from at least one of the plural transform parts or to cyclically shift an order of the output signal group according to the peak control signal so as to output an adjusted signal group, the peak reducing process part being further configured to add the adjusted signal group to another signal group output from a transform part other than the at least one of the plural transform parts so as to output an added signal group, wherein the peak control part generates, as the peak control signal, the weight to be applied to the output signal group or a shift amount used for cyclically shifting the order using the peak position.