Frequency-time domain masking and digital encryption system for DSM-based fiber-wireless integrated system

IF 2.6 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Optical Fiber Technology Pub Date : 2024-11-07 DOI:10.1016/j.yofte.2024.104020

Tianqi Zheng, Kaihui Wang, Xiongwei Yang, Chengzhen Bian, Weiping Li, Jianjun Yu, Fellow, IEEE

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Abstract

Delta-sigma modulation can achieve single-carrier high-order quadrature amplitude modulation (QAM) or orthogonal frequency division multiplexing (OFDM) transmission with a very high signal-to-noise ratio. We design an encryption structure that combines delta-sigma modulation (DSM) and digital encryption. This not only improves the flexibility of the system, but also masks the spectral characteristics of the DSM signal. Based on this structure, we additionally demonstrate a frequency-time domain masking (FTDM) and digital encryption scheme with improved confidentiality. Frequency domain masking is realized by digital encryption after DSM, and time domain masking is realized by using multi-scroll chaos superposition on the QAM constellation. In addition, the conventional multi-scroll chaos masking scheme runs the risk of being forced to attack by the blind separation algorithm due to the insufficient power of the chaotic signal. The fidelity of DSM to the signal allows the chaotic signal to mask the constellation points with a higher power ratio. Greatly improves the reliability of this method. Finally, a chaotic-based FTDM and digital encryption scheme with a key space of 10²⁰⁷ is implemented in a photonics-aided millimeter radio-over-fiber (ROF) system employing DSM, multi-scroll chaos masking, and deoxyribonucleic acid (DNA) digital encryption. The equivalent 1.67 GBaud encrypted-4096QAM signal is successfully transmitted and decrypted over a 4.6 km wireless link in the DSM-based fiber-wireless integrated system.

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基于 DSM 的光纤-无线集成系统的频时域屏蔽和数字加密系统

Δ-Σ调制能以极高的信噪比实现单载波高阶正交幅度调制（QAM）或正交频分复用（OFDM）传输。我们设计了一种结合三角Σ调制（DSM）和数字加密的加密结构。这不仅提高了系统的灵活性，还掩盖了 DSM 信号的频谱特性。在此结构的基础上，我们还展示了一种具有更高保密性的频域-时域掩蔽（FTDM）和数字加密方案。频域掩蔽通过 DSM 后的数字加密来实现，时域掩蔽则通过在 QAM 星座上使用多卷混沌叠加来实现。此外，由于混沌信号的功率不足，传统的多卷混沌掩蔽方案存在被盲分离算法强制攻击的风险。DSM 对信号的保真度允许混沌信号以更高的功率比掩蔽星座点。这大大提高了该方法的可靠性。最后，在光子辅助毫米波光纤射频（ROF）系统中实现了基于混沌的FTDM和数字加密方案，其密钥空间为10207，采用了DSM、多卷混沌掩蔽和脱氧核糖核酸（DNA）数字加密。在基于 DSM 的光纤-无线集成系统中，等效的 1.67 GBaud 加密-4096QAM 信号在 4.6 千米的无线链路上成功传输和解密。

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来源期刊

Optical Fiber Technology 工程技术-电信学

CiteScore

4.80

自引率

11.10%

发文量

327

审稿时长

63 days

期刊介绍： Innovations in optical fiber technology are revolutionizing world communications. Newly developed fiber amplifiers allow for direct transmission of high-speed signals over transcontinental distances without the need for electronic regeneration. Optical fibers find new applications in data processing. The impact of fiber materials, devices, and systems on communications in the coming decades will create an abundance of primary literature and the need for up-to-date reviews. Optical Fiber Technology: Materials, Devices, and Systems is a new cutting-edge journal designed to fill a need in this rapidly evolving field for speedy publication of regular length papers. Both theoretical and experimental papers on fiber materials, devices, and system performance evaluation and measurements are eligible, with emphasis on practical applications.