混合通道编码用于OAM分区的多重复合自由空间光通信系统
Optics express
|September 15, 2023
概括
本研究介绍了用于轨道角动量分裂多重化自由空间光通信 (OAM-DM FSO) 系统的混合通道编码. 这种方法通过解决大气流来增强编码收益,从而改善系统的整体性能.
科学领域:
- 光学通信是指光学通信.
- 信息理论 信息理论
- 大气物理学 大气物理学
背景情况:
- 自由空间光通信 (FSO) 系统因大气流而面临性能下降.
- 轨道角动量 (OAM) 划分复杂化 (DM) 在FSO系统中提供了更大的数据容量.
- 频道编码对于减轻FSO链接的色和错误至关重要.
研究的目的:
- 建议和评估OAM-DM FSO系统的混合通道编码方案.
- 通过考虑由大气流引起的模式依赖的通道色来改善编码收益.
- 为了提高OAM-DM FSO通信的整体性能和可靠性.
主要方法:
- 在OAM-DM FSO系统中实施混合通道编码策略.
- 模拟大气流效应,特别是模式依赖的通道色.
- 模拟分析将拟议的混合编码与单通道编码进行比较.
主要成果:
- 与单通道编码相比,混合通道编码方法显著增加了编码收益.
- 对于OAM1/OAM3复杂化系统,使用非统一的LDPC代码 (0.7代码速率) 观察到编码增益增加1.85dB (Cn2=1E-14,BER=1E-5).
- 对于一个四OAM模式的复杂化系统 (+1,+3,+5,+7),在类似的大气条件下,编码增益的提高超过3.8dB (Cn2=1E-14,BER=1E-5).
结论:
- 混合通道编码有效地弥补了OAM-DM FSO系统中的大气通道色.
- 拟议的方法通过考虑大气流引起的模式依赖的色来增强编码增益.
- 这种方法为提高高容量FSO通信的性能和稳定性提供了可行的解决方案.
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