Maximum likelihood synchronization algorithm correction for photon-counting communications with blocking loss

被引：1
作者：
Wen, Tiancheng [1 ,2 ]
Si, Yue [1 ,2 ]
Huang, Jun [1 ,2 ]
Zhang, Liang [1 ,2 ,3 ]
Shu, Rong [1 ,2 ,3 ]
Wang, Jianyu [1 ,2 ,3 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Tech Phys, Key Lab Space Act Optoelect Technol, Shanghai 200083, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Hefei Natl Lab, Hefei 230088, Peoples R China
来源：
OPTICS EXPRESS | 2023年 / 31卷 / 17期
基金：
国家重点研发计划;
关键词：
SYMBOL; SLOT;
D O I：
10.1364/OE.497343
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
To realize deep space optical communications with high capacity and sensitivity, synchronization of pulse-position modulation (PPM) signals is crucial. In this study, the maximum likelihood synchronization algorithm based on inter-symbol guard times was generalized to the scenario with strong blockage of single-photon detectors, where higher PPM slot frequency and signal-noise ratio could be adopted. Furthermore, a slot frequency offset compensation method was proposed, and simulations and experiments were performed to verify the performance improvement of the proposed corrected synchronization algorithm under blockage. The results indicated that the deadtime-corrected synchronization scheme could effectively overcome the performance degradation of the original model under high photon flux, provide estimation (0.02749 slots @ root-mean-square error) close to the Cramer-Rao Bound, and error rates close to ideal synchronization in the experiment.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码：28320 / 28337
页数：18
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