Physically secured orthogonal frequency division multiplexing–passive optical network employing noise-based encryption and signal recovery process
Physically secured orthogonal frequency division multiplexing–passive optical network employing noise-based encryption and signal recovery process
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DOI：
10.1117/1.oe.55.2.026103
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发表时间：
2016-02
影响因子：
1.3
通讯作者：
W. Jin;Chongfu Zhang;Weicheng Yuan
中科院分区：
文献类型：
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作者：
W. Jin;Chongfu Zhang;Weicheng Yuan
抽象。提出了一种基于噪声加密和信道/相位估计的直接检测-正交频分复用-无源光网络（DD-OFDM-PON）和长距离相干检测-正交频分复用-无源光网络（LRCO-OFDM-PON）物理增强安全方案。利用混沌映射产生的噪声数据代替前导码中的训练序列实现信道估计和帧同步，并嵌入到随机间隔的可变数目的密钥选择导频子载波上实现相位估计。因此，用于信号恢复的信息作为不可预测的噪声信息被完全隐藏在OFDM帧中，以掩盖有用的信息，并防止非法用户正确地实现OFDM解调，从而增强对攻击者的抵抗力。从理论上分析了非法解密的复杂度和实现复杂度。通过大量的仿真，所提出的信道/相位估计的性能和加密导频引入的安全性在DD-OFDM和LRCO-OFDM系统中进行了研究。此外，在所提出的安全DD-OFDM/LRCO-OFDM PON模型中，已经考虑了法律的和非法的接收场景。这些结果表明，通过利用所提出的方案，可以显着提高抵抗攻击者在DD-OFDM-PON和LRCO-OFDM-PON系统的性能不下降。
Abstract. We propose a physically enhanced secure scheme for direct detection–orthogonal frequency division multiplexing–passive optical network (DD-OFDM-PON) and long reach coherent detection–orthogonal frequency division multiplexing–passive optical network (LRCO-OFDM-PON), by employing noise-based encryption and channel/phase estimation. The noise data generated by chaos mapping are used to substitute training sequences in preamble to realize channel estimation and frame synchronization, and also to be embedded on variable number of key-selected randomly spaced pilot subcarriers to implement phase estimation. Consequently, the information used for signal recovery is totally hidden as unpredictable noise information in OFDM frames to mask useful information and to prevent illegal users from correctly realizing OFDM demodulation, and thereby enhancing resistance to attackers. The levels of illegal-decryption complexity and implementation complexity are theoretically discussed. Through extensive simulations, the performances of the proposed channel/phase estimation and the security introduced by encrypted pilot carriers have been investigated in both DD-OFDM and LRCO-OFDM systems. In addition, in the proposed secure DD-OFDM/LRCO-OFDM PON models, both legal and illegal receiving scenarios have been considered. These results show that, by utilizing the proposed scheme, the resistance to attackers can be significantly enhanced in DD-OFDM-PON and LRCO-OFDM-PON systems without performance degradations.