To provide a multicarrier signal transmission apparatus and a method thereof capable of reducing a transmission peak power versus average power ratio of a multicarrier signal without deteriorating the demodulation performance and the transmission efficiency of a receiver side communication apparatus and to provide a wireless communication apparatus with less power consumption provided with the multicarrier signal transmission apparatus.

A signal replacement section 110 replaces part of subcarriers in the multicarrier signal received by an FFT section 108, that is, subcarriers designated by a subcarrier designation section 109 on the basis of a subcarrier designation signal received from the subcarrier designation section 109 with corresponding subcarriers stored in a buffer section 102 and before being over-sampled and before the power level of the subcarriers is suppressed.