OFDM TRANSMITTER AND ITS CONTROL METHOD

摘要

An OFDM transmitter needing a lowered computational complex for peak suppression during OFDM transmission. The OFDM transmitter comprises a subcarrier selecting section (113), a write data selecting section (116), an IFFT section (115), and a peak suppression waveform subtraction section (119). The sub-carrier selecting section (113) arranges a group of N subcarriers bilaterally symmetrically on both side with respect to the N/2-th subcarrier and selects a subcarrier of low communication quality as a peak suppression subcarrier from the carrier produced by performing division into m sub-blocks arranged into the same patterns. The write data selecting section (116) selects only pieces of data whose values are not zero out of the peak suppression OFDM signal data computed by the IFFT section (115). The peak suppression waveform subtracting section (119) repeats subtraction of the peak suppression OFDM signal generated by excluding zero data at the write data selecting section (116) from the transmission data OFDM signal to be suppressed until the transmission data OFDM signal becomes, e.g., below a predetermined target PAPR value.