星座
自由空间光通信
伪随机数发生器
概率逻辑
混乱的
光通信
密钥空间
计算机科学
光学混沌
光学
传输(电信)
加密
物理
拓扑(电路)
算法
电信
数学
人工智能
计算机网络
激光器
组合数学
半导体激光器理论
天文
作者
Ting-Wei Wu,wei zeng,Yejun Liu,Song Song,Lun Zhao,Chen Chen,Chongfu Zhang,Lei Guo
出处
期刊:Optics Letters
[The Optical Society]
日期:2023-01-24
卷期号:48 (3): 684-684
被引量:5
摘要
We propose a chaotic region-optimized probabilistic constellation shaping (CRPCS) scheme to enhance the security and the resistance to turbulence for free-space optical (FSO) communications. For this approach, a four-dimensional hyperchaotic system generates a pseudorandom sequence to rotate and encrypt the constellation. Constellation distribution of short pseudorandom sequences behaves as the law of a non-uniform character. Grouping long pseudorandom sequences and counting the characteristics of constellation distribution can realize probabilistic constellation shaping with low and fixed redundant information. We demonstrate a 56 Gbyte/s coherent FSO communication system based on log-normal and Gamma–Gamma turbulence models with a key space of 10 75 . The results show that the optical receiver sensitivity is improved by 0.3–1.1 dB, and the transmission distance is also improved by 3.2%–7.0% in different shaping cases.
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