Research Article
Research on the Signal Detection in an Uplink Ground-to-Satellite UDC-FSO System with Optical Path Difference
@INPROCEEDINGS{10.1007/978-3-031-86196-3_8, author={Ya-Tian Li and Zhi-Qiang Xu and Kai-Nan Yao and Rui-Peng Li and Lu Chen and Hong-Zhuang Li}, title={Research on the Signal Detection in an Uplink Ground-to-Satellite UDC-FSO System with Optical Path Difference}, proceedings={Wireless and Satellite Systems. 14th EAI International Conference, WiSATS 2024, Harbin, China, August 23--25, 2024, Proceedings, Part I}, proceedings_a={WISATS}, year={2025}, month={3}, keywords={Free Space Optics Uniquely Decodable Code Optical Path Difference}, doi={10.1007/978-3-031-86196-3_8} }- Ya-Tian Li
Zhi-Qiang Xu
Kai-Nan Yao
Rui-Peng Li
Lu Chen
Hong-Zhuang Li
Year: 2025
Research on the Signal Detection in an Uplink Ground-to-Satellite UDC-FSO System with Optical Path Difference
WISATS
Springer
DOI: 10.1007/978-3-031-86196-3_8
Abstract
This paper focuses on the optical path difference (OPD) in a(2 \times 1)uplink ground-to-satellite free space optics (FSO) system with uniquely decodable codes (UDC), where the different data from transmitters (TXs) are superimposed asynchronously due to the OPD. We first analyze the influence of OPD on the uplink UDC-FSO system. Then the suboptimal minimal detection for moved patterns (MDMP) and optimal minimal metric-based pattern detection (MMPD) algorithms are proposed for mitigating the OPD-introduced interference, which are based on the minimum distance criterion and maximum likelihood sequence detection, respectively. Simulation results of symbol error rate (SER) and mutual information show that both of them outperform the case of directly detection notably. A desktop equivalent experiment is also built to verify the effectiveness of the proposed algorithms. It also promotes the potential for practical application of the UDC-FSO system.
