Interleaved subcarrier allocation for DFT-spread OFDM to reduce PAPR

Discrete-Fourier-transform spread orthogonal frequency-division multiplexing (DFT-S-OFDM) draws increasing attention by its prominent advantage in low peak-to-average power ratio (PAPR). DFT-S-OFDM originate from the single carrier frequency division multiple access (SC-FDMA) which is the uplink multiple access scheme for 3GPP LTE. Although DFT-S-OFDM has been introduced to optical communication, detailed discussion on this scheme is still necessary. In this paper, we study the PAPR performance of DFT-S-OFDM in optical transmission system and compare the performance of different subcarrier allocation method. Meanwhile, we propose to utilize interleaved subcarrier allocation and demonstrate that obvious improvement in input power range and BER at high input power will be achieved.