Proposal and application of hybrid SLM-PTS method in 8QAM-OFDM optical access system for reducing PAPR influence

In this letter, a novel hybrid SLM-PTS algorithm for reducing peak-to-average power ratio (PAPR) influence, is proposed and analyzed in an 10Gbit/s 8QAM-OFDM optical access system. After the serial-to-parallel conversion, transmitted signals are divided into two data subblocks, and one subblock is processed by SLM method and the other is processed by PTS. And then the processed data subblocks are merged into one transmission sequence. In 10Gbit/s optical access systems, through comparing PAPR, bit error rate (BER) and computational complexity, SLM, PTS and hybrid SLM-PTS methods show their respective advantages. The results show that the hybrid SLM-PTS algorithm can provide a possible compromise for PAPR reduction. The proposed hybrid algorithm exhibits lower computational complexity when the used subcarriers number is smaller. Compared with traditional PTS and SLM methods, using the proposed method the value of BER is the lowest under the certain signal to noise ratio (SNR) condition.