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A Security-Enhanced NOMA Scheme Based on Dynamically Concealed Key- Accompanying Transmission
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DOI：10.1109/JPHOT.2026.3656488.png)
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Abstract
En 中文
This paper proposes a security-enhanced NOMA scheme based on dynamically concealed key-accompanying transmission. To improve security, in this paper, the 3D-LHemon model is utilized to encrypt the bit stream, symbols and subcarriers of high-power quadrature phase shift keying (QPSK) signals. The key is placed in a low-power binary phase shift keying (BPSK) signal, which is transmitted in parallel and superimposed with the high-power QPSK signal. Meanwhile, the phase points of the constellation diagram of the low-power signal are subjected to chaotic perturbation through Sinusoidal mapping. At the receiver, successive interference cancellation (SIC) decodes the high-power and low-power signals sequentially. Experimental results demonstrate the transmission of a 56 Gb/s orthogonal frequency division multiplexing (OFDM) signal over a 2-km 7-core optical fiber. Furthermore, the proposed scheme achieves an expansive key space of up to 10<^>87, effectively ensuring robust physical layer security. In contrast to existing chaos-based physical layer encryption for Non-Orthogonal Multiple Access (NOMA), this method applies chaotic encryption to high-power and low-power signals independently. This dual-layer approach significantly enhances system security without increasing computational overhead. Consequently, this scheme is capable of supporting a larger user base and holds promising potential for application in future optical networks.
Keywords:
Encryption
OFDM
NOMA
Optical fibers
Chaotic communication
Binary phase shift keying
Phase shift keying
Symbols
Passive optical networks
Optical transmitters
key-accompanying transmission
seven core fiber
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