Xiao Yaoqiang, Wang Bingshuai, Wang Zhiyi, Zhou Zhihua, He Jing
Opt Express. 2022 Jan 31;30(3):4412-4423. doi: 10.1364/OE.450878.
The physical layer security of millimeter-wave radio-over-fiber (MMW-RoF) system at W-band is a promising topic. This paper experimentally demonstrates a one-time pad scheme based on polar code and orthogonal frequency division multiplexing (OFDM) for MMW-RoF system. In the proposed scheme, the initial key is obtained by looking-up table mapping randomly, and chaotic sequence is generated by using 4-D cellular neural network (CNN). The key for next frame is placed in the partial frozen bits of polar code, which can realize the one-time pad mechanism. The encrypted OFDM signal carried by 100GHz millimeter-wave is successfully transmitted over 50 km standard single-mode fiber (SSMF) and 5 m wireless channel in this experiment. The experimental results show that, compared with the traditional OFDM signal, the proposed scheme in SCL8 decoder can achieve ∼4.1 dB gain at the BER of 10, which can effectively use the frozen bits of polar code to transmit more information and improve the security and reliability of the whole system.
W波段毫米波光纤无线（MMW-RoF）系统的物理层安全是一个很有前景的课题。本文通过实验演示了一种用于MMW-RoF系统的基于极化码和正交频分复用（OFDM）的一次性密码本方案。在所提出的方案中，初始密钥通过随机查找表映射获得，混沌序列由四维细胞神经网络（CNN）生成。下一帧的密钥放置在极化码的部分冻结比特中，从而实现一次性密码本机制。在本实验中，由100GHz毫米波承载的加密OFDM信号成功通过50km标准单模光纤（SSMF）和5m无线信道进行了传输。实验结果表明，与传统OFDM信号相比，所提方案在SCL8解码器中，在误码率为10时可实现约4.1dB的增益，能够有效利用极化码的冻结比特来传输更多信息，提高整个系统的安全性和可靠性。
