Atmospheric Turbulence-Immune Free Space Optical Communication System based on Discrete-Time Analog Transmission

arXiv - EE - Signal Processing Pub Date : 2024-09-18 DOI:arxiv-2409.11928

Hongyu Huang, Zhenming Yu, Yi Lei, Wei Zhang, Yongli Zhao, Shanguo Huang, Kun Xu

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Abstract

To effectively mitigate the influence of atmospheric turbulence, a novel discrete-time analog transmission free-space optical (DTAT-FSO) communication scheme is proposed. It directly maps information sources to discrete-time analog symbols via joint source-channel coding and modulation. Differently from traditional digital free space optical (TD-FSO) schemes, the proposed DTAT-FSO approach can automatically adapt to the variation of the channel state, with no need to adjust the specific modulation and coding scheme. The performance of the DTAT-FSO system was evaluated in both intensity modulation/direct detection (IM/DD) and coherent FSO systems for high-resolution image transmission. The results show that the DTAT-FSO reliably transmits images at low received optical powers (ROPs) and automatically enhances quality at high ROPs, while the TD-FSO experiences cliff and leveling effects when the channel state varies. With respect to the TD-FSO scheme, the DTAT-FSO scheme improved receiver sensitivity by 2.5 dB in the IM/DD FSO system and 0.8 dB in the coherent FSO system, and it achieved superior image fidelity under the same ROP. The automatic adaptation feature and improved performance of the DTAT-FSO suggest its potential for terrestrial, airborne, and satellite optical networks, addressing challenges posed by atmospheric turbulence.

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基于离散时间模拟传输的大气湍流-免疫自由空间光通信系统

为了有效缓解大气湍流的影响，我们提出了一种新型离散时间模拟传输自由空间光（DTAT-FSO）通信方案。该方案通过联合信源信道编码和调制，直接将信息源映射为离散时间模拟符号。与传统的数字自由空间光（TD-FSO）方案不同，DTAT-FSO方案能自动适应信道状态的变化，无需调整特定的调制和编码方案。在用于高分辨率图像传输的强度调制/直接检测（IM/DD）和相干 FSO 系统中，对 DTAT-FSO 系统的性能进行了评估。结果表明，DTAT-FSO能在低接收光学功率（ROPs）条件下可靠地传输图像，并能在高接收光学功率条件下自动提高图像质量，而TD-FSO在信道状态变化时会出现悬崖和水平效应。与 TD-FSO 方案相比，DTAT-FSO 方案在 IM/DD FSO 系统中将接收器灵敏度提高了 2.5 dB，在相干 FSO 系统中提高了 0.8 dB，并在相同接收光功率下实现了更高的图像保真度。DTAT-FSO 的自动适应功能和更高的性能表明，它具有在地面、机载和卫星光网络中应用的潜力，可应对大气湍流带来的挑战。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - EE - Signal Processing

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