Ma Yiming, Ren Jianxin, Liu Bo, Ma Yilan, Ullah Rahat, Wu Xiangyu, Mao Yaya, Chen Shuaidong, Wan Yibin, Zhong Qing, Xia Wenchao, Wu Yongfeng, Zhao Lilong
Opt Lett. 2023 Aug 1;48(15):4101-4104. doi: 10.1364/OL.493540.
This study aims to present a non-orthogonal multiple access (NOMA) security scheme based on constellation camouflage and selective mapping. To improve the security of the system, we use a four-dimensional chaos model to camouflage high-power signals at the transmitter. The constellation diagram of high power is disguised from binary phase-shift keying (BPSK) form to quadrature phase-shift keying (QPSK) form, and after power multiplexing, further camouflaged from 8 points to 16 points. To improve the transmission performance of the designed system as much as possible and not increase the computational complexity, we use the selective mapping method in the process of power multiplexing and use the region decision method for demodulation at the receiving end. The proposed scheme is verified by experiments on a 2-km 7-core optical fiber, and achieves the safety transmission of a power division multiplexing-orthogonal frequency-division multiplexing (PDM-OFDM) signal with a net rate of 97.38 Gb/s without signal damage. The maximum achievable key space of the proposed scheme is 10. Hence, it is a feasible and secure non-orthogonal multiple access-passive optical network scheme.
本研究旨在提出一种基于星座伪装和选择性映射的非正交多址接入（NOMA）安全方案。为提高系统安全性，我们在发射端使用四维混沌模型对高功率信号进行伪装。高功率星座图从二进制相移键控（BPSK）形式伪装成正交相移键控（QPSK）形式，经过功率复用后，进一步从8点伪装成16点。为在不增加计算复杂度的情况下尽可能提高所设计系统的传输性能，我们在功率复用过程中采用选择性映射方法，并在接收端采用区域判决方法进行解调。所提方案在2公里长的7芯光纤上通过实验得到验证，实现了净速率为97.38 Gb/s的波分复用-正交频分复用（PDM-OFDM）信号的安全传输且无信号损伤。所提方案的最大可实现密钥空间为10。因此，它是一种可行且安全的非正交多址接入-无源光网络方案。
