OFDM-PON系统中一种抑制峰均功率比的安全算法
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摘要
安全性低和较高的峰均功率比(PAPR)是正交频分复用无源光网络(OFDM-PON)系统所面临的主要挑战,为此提出一种基于二维混沌加密的选择性映射(SLM)方案。该方案利用二维Logistic映射分别产生随机交织器和相位序列对OFDM信号进行加扰,达到系统加密的同时降低PAPR的目的。仿真结果显示,与传统SLM算法和原始光OFDM(O-OFDM)信号相比,所提出的方案可分别获得0.5dB和3.8dB的PAPR抑制增益。实验证明,7Gbit/s 16QAM (Quadrature Amplitude Modulation)O-OFDM加密信号可通过25km标准单模光纤在强度调制/直接检测OFDM-PON系统中安全传输并且系统误码率性能得到改善。
Low security and high peak-to-average power ratio(PAPR)are two major challenges for orthogonal frequency division multiplexing passive optical network(OFDM-PON)systems.This study proposes a secure selective mapping(SLM)scheme based on two-dimensional chaotic encryption.The subcarriers of OFDM signals are scrambled by the random interleavers and phase sequences generated using a two-dimensional logistic map to achieve both encryption and PAPR reduction.The simulation results show that compared with the conventional SLM and original optical OFDM(O-OFDM)signals,the proposed scheme can obtain PAPR suppression gains of 0.5 dB and 3.8 dB,respectively.The experimental results demonstrate that a 7 Gbit/s 16-quadrature-amplitude-modulation(16 QAM)O-OFDM encrypted signal can be securely transmitted in the intensity modulation/direct detection OFDM-PON system through a 25-km standard single-mode fiber.Moreover,the bit error rate performance of OFDM-PON systems is considerably improved.
Low security and high peak-to-average power ratio(PAPR)are two major challenges for orthogonal frequency division multiplexing passive optical network(OFDM-PON)systems.This study proposes a secure selective mapping(SLM)scheme based on two-dimensional chaotic encryption.The subcarriers of OFDM signals are scrambled by the random interleavers and phase sequences generated using a two-dimensional logistic map to achieve both encryption and PAPR reduction.The simulation results show that compared with the conventional SLM and original optical OFDM(O-OFDM)signals,the proposed scheme can obtain PAPR suppression gains of 0.5 dB and 3.8 dB,respectively.The experimental results demonstrate that a 7 Gbit/s 16-quadrature-amplitude-modulation(16 QAM)O-OFDM encrypted signal can be securely transmitted in the intensity modulation/direct detection OFDM-PON system through a 25-km standard single-mode fiber.Moreover,the bit error rate performance of OFDM-PON systems is considerably improved.
引文
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[14]Wu J D,Lu J,Ren H L,et al.Nonlinear equalizer based on general regression neural network in coherent optical OFDM system[J].Acta Optica Sinica,2018,38(9):0906002.吴金达,卢瑾,任宏亮,等.基于广义回归神经网络的CO-OFDM系统非线性均衡[J].光学学报,2018,38(9):0906002.
[15]Jiang T,Wu Y.An overview:peak-to-average power ratio reduction techniques for OFDM signals[J].IEEE Transactions on Broadcasting,2008,54(2):257-268.
[16]Ali N,Almahainy R,Al-Shabili A,et al.Analysis of improvedμ-law companding technique for OFDMsystems[J].IEEE Transactions on Consumer Electronics,2017,63(2):126-134.
[17]Zhang W,Zhang C F,Chen C,et al.Joint PAPRreduction and physical layer security enhancement in OFDMA-PON[J].IEEE Photonics Technology Letters,2016,28(9):998-1001.
[2]Xiao Y Q,Chen M,Li F,et al.PAPR reduction based on chaos combined with SLM technique in optical OFDM IM/DD system[J].Optical Fiber Technology,2015,21:81-86.
[3]He J,Long F T,Deng R,et al.Flexible multiband OFDM ultra-wideband services based on optical frequency combs[J].Journal of Optical Communications and Networking,2017,9(5):393-400.
[4]Dong Y J,Tang Y J,Ren H L,et al.Phase noise compensation algorithm of CO-OFDM system based on unscented Kalman filter[J].Chinese Journal of Lasers,2017,44(11):1106010.董月军,唐英杰,任宏亮,等.基于无迹卡尔曼滤波的CO-OFDM系统相位噪声补偿算法[J].中国激光,2017,44(11):1106010.
[5]Kuang C X,Chen R R,Song Y X,et al.Throughput potential of orthogonal frequency division multiplexing passive optical network uplink based on reflective semiconductor optical amplifiers[J].Acta Optica Sinica,2016,36(9):0906002.邝彩霞,陈荣荣,宋英雄,等.基于反射式半导体光放大器的OFDM-PON上行通道吞吐潜力[J].光学学报,2016,36(9):0906002.
[6]Azim A W,Le Guennec Y,Maury G.Decisiondirected iterative methods for PAPR reduction in optical wireless OFDM systems[J].Optics Communications,2017,389:318-330.
[7]Tong Z R,Liu Y H,Cao Y.Research on peak-toaverage power ratio reduction performance for100Gb/s high-speed PDM-CO-OFDM systems[J].Acta Optica Sinica,2015,35(1):0106002.童峥嵘,刘颖慧,曹晔.100 Gb/s高速PDM-CO-OFDM系统峰值平均功率比抑制性能研究[J].光学学报,2015,35(1):0106002.
[8]Wang Y J,Shao Y F,Chi N.Application of peak-toaverage power ratio reduction algorithm using precoding technique in 60GHz orthogonal frequencydivision multiplexing radio-over-fiber system[J].Acta Optica Sinica,2013,33(7):0706018.王燕瑾,邵宇丰,迟楠.预编码峰均比抑制算法在60GHz正交频分复用光载无线通信系统中的应用[J].光学学报,2013,33(7):0706018.
[9]Xiao Y Q,Wang Z Y,Cao J,et al.Time-frequency domain encryption with SLM scheme for physicallayer security in an OFDM-PON system[J].IEEE/OSA Journal of Optical Communications and Networking,2018,10(1):46-51.
[10]Liu B,Zhang L J,Xin X J,et al.Physical layer security in OFDM-PON based on dimensiontransformed chaotic permutation[J].IEEE Photonics Technology Letters,2014,26(2):127-130.
[11]Zhang W,Zhang C F,Jin W,et al.Hybrid timefrequency domain chaotic interleaving for physicallayer security enhancement in OFDM-PON systems[C].2016 IEEE/CIC International Conference on Communications in China(ICCC),2016:1-4.
[12]Zhang L J,Xin X J,Liu B,et al.Physical secure enhancement in optical OFDMA-PON based on twodimensional scrambling[J].Optics Express,2012,20(26):B32-B37.
[13]Yang X L,Shen Z W,Hu X N,et al.Chaotic encryption algorithm against chosen-plaintext attacks in optical OFDM transmission[J].IEEE Photonics Technology Letters,2016,28(22):2499-2502.
[14]Wu J D,Lu J,Ren H L,et al.Nonlinear equalizer based on general regression neural network in coherent optical OFDM system[J].Acta Optica Sinica,2018,38(9):0906002.吴金达,卢瑾,任宏亮,等.基于广义回归神经网络的CO-OFDM系统非线性均衡[J].光学学报,2018,38(9):0906002.
[15]Jiang T,Wu Y.An overview:peak-to-average power ratio reduction techniques for OFDM signals[J].IEEE Transactions on Broadcasting,2008,54(2):257-268.
[16]Ali N,Almahainy R,Al-Shabili A,et al.Analysis of improvedμ-law companding technique for OFDMsystems[J].IEEE Transactions on Consumer Electronics,2017,63(2):126-134.
[17]Zhang W,Zhang C F,Chen C,et al.Joint PAPRreduction and physical layer security enhancement in OFDMA-PON[J].IEEE Photonics Technology Letters,2016,28(9):998-1001.