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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.

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Research on the Signal Detection in an Uplink Ground-to-Satellite UDC-FSO System with Optical Path Difference

  • 会议论文

  • 发表日期：

    2025年

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  • Ya-Tian Li,
  • Zhi-Qiang Xu,
  • Kai-Nan Yao,
  • Rui-Peng Li,
  • Lu Chen,
  • Hong-Zhuang Li

摘要

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.