极点编码的概率形状PAM8的性能有系统的交叉和相同分布的飞行员在弱流中
Optics express
|September 15, 2023
概括
这项研究引入了极性编码的概率形状的8-ary脉冲振幅调制 (PS-PAM8) 用于弱流,通过系统间接器 (SIL) 和混合等级来提高性能.
科学领域:
- 光学无线通信的无线通信.
- 自由空间光学 (FSO) 链接
- 先进的调制和编码方案.
背景情况:
- 弱流显著影响自由空间光通信性能.
- 概率造型 (PS) 和先进的错误校正代码对于强大的光学链路至关重要.
- 现有的通道估计和均衡方法在动荡的FSO环境中面临挑战.
研究的目的:
- 为了研究极性编码的概率形状8-ary脉冲振幅调制 (PS-PAM8) 在弱流中的性能.
- 提出一个系统间接器 (SIL),以提高PS-PAM8.的极性代码效率.
- 评估混合平衡和试点辅助通道估计在减轻流效应方面的有效性.
主要方法:
- 实现极性编码的PS-PAM8与新型系统交叉器 (SIL) 的实现.
- 使用与传输数据相同分布的飞行员进行动态通道估计.
- 混合等分的应用,结合非线性和线性等分器.
- 在一个控制的弱流室中实验验证实,模拟日志正常色.
主要成果:
- 极地编码的PS-PAM8与SIL的性能比低密度平价检查编码的PAM8高1.0dB.
- 线性平衡提供了0.720.83dB的额外的电力预算节省.
- 使用SIL和混合均等在1.5位/通道使用时,可获得高达2.0dB的成型效益.
- 拟议的方案在各种弱流条件下提高了0.491.74dB的Q因子.
结论:
- 拟议的极点编码PS方案与SIL和混合平衡提供了在弱流中显著的性能改进.
- 系统的交叉和混合平衡是有效的打击通道色和降低接收器的灵敏度.
- 这种方法提高了自由空间光通信系统的可靠性和效率.
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