| LIU Ye,TONG Zhengrong,ZHANG Weihua,LI Tingting,WANG Mingxu.A hybrid algorithm for reducing PAPR of CO-OFDM system based on fast Hadamard transformation cascading SLM[J].Optoelectronics Letters,2021,17(9):534-538 |
| A hybrid algorithm for reducing PAPR of CO-OFDM system based on fast Hadamard transformation cascading SLM |
| Author Name | Affiliation | | LIU Ye | Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelec-tronic Devices and Communication Technology, Ministry of Education, School of Electrical and Electronic Engineer-ing, Tianjin University of Technology, Tianjin 300384, China | | TONG Zhengrong | Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelec-tronic Devices and Communication Technology, Ministry of Education, School of Electrical and Electronic Engineer-ing, Tianjin University of Technology, Tianjin 300384, China | | ZHANG Weihua | Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelec-tronic Devices and Communication Technology, Ministry of Education, School of Electrical and Electronic Engineer-ing, Tianjin University of Technology, Tianjin 300384, China | | LI Tingting | Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelec-tronic Devices and Communication Technology, Ministry of Education, School of Electrical and Electronic Engineer-ing, Tianjin University of Technology, Tianjin 300384, China | | WANG Mingxu | Tianjin Key Laboratory of Film Electronic and Communication Devices, Engineering Research Center of Optoelec-tronic Devices and Communication Technology, Ministry of Education, School of Electrical and Electronic Engineer-ing, Tianjin University of Technology, Tianjin 300384, China |
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| Abstract: |
| In this paper, a hybrid technique using fast Hadamard transformation cascading a selective mapping (FHT-SLM) is proposed to reduce peak-to-average power ratio (PAPR) and complexity in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system. The Hadamard transform is used to reduce the autocorrelation of signals so as to reduce the PAPR of signals. The fast Hadamard transform (FHT) algorithm is obtained by recursive decomposition of sparse matrix of a simple Hadamard matrix, which improves the computational efficiency and greatly reduces the computational complexity. Then, a selective mapping (SLM) scheme is used to select the smallest frame of PAPR in the time domain to further reduce PAPR of OFDM system. The simulation results show that at the complementary cumulative distribution function (CCDF) of , the PAPR of the proposed scheme FHT-SLM (V=8) is optimized to 7.63 dB. Meanwhile, when the bit error rate (BER) is 10-3, the optical signals to noise ratio (OSNR) of FHT-SLM (V=8) algorithm is 21.2 dB. The total computational cost of the FHT-SLM (V=8) is 28 672. Consequently, the simulation results prove that the proposed algorithm provides a choice for a balance among PAPR, BER and complexity. |
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