Two-stage frequency compensation for Doppler shift on BPSK transceiver with LDPC codes for free-space optical communication systems

Frontiers in Physics

Physics

Yunqiang Zheng¹  Sentao Wei¹  Tingting Wei¹  Yufei Wang¹  Junxia Wu¹  Wenchao Nie¹  Zhaofeng Bai²  Xiaoping Xie²  Jiacheng Meng²  Duorui Gao²  Wei Wang²  Zhuang Xie³ 

[1] State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences, Xi’an, China;State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics (XIOPM), Chinese Academy of Sciences, Xi’an, China;University of Chinese Academy of Sciences, Beijing, China;University of Chinese Academy of Sciences, Beijing, China;

关键词: optical communication;    coherence;    digital demodulation;    LDPC;    frequency offset compensation;   

DOI  :  10.3389/fphy.2023.1099867

 received in 2022-11-16, accepted in 2023-02-06,  发布年份 2023

来源: Frontiers

【 摘 要 】

The deployment of low earth orbits is seen as a promising way of enlarging data capacities as well as high data rates. Catering to these interests, optical communication presents possible ways of larger bandwidth than microwave communication. The current generation of mainstream communication systems are classified as coherent systems and incoherent systems, and in particular, coherent systems have received more attention owing to their high receiving sensitivity. This study investigates a digital coherent transceiver, based on binary phase-shift keying technology. As coherent demodulation will be affected by considering the Doppler shift effect in digital demodulation, Doppler shift of ± GHz can be compensated by adopting a two-stage frequency offset compensation. Moreover, by leveraging a fast filtering algorithm a considerable amount of resource consumption is saved in its engineering implementation, and its sensitivity can be significantly enhanced via a high-speed parallel error-correction codec based on low-density parity-check technology.

【 授权许可】

Unknown   
Copyright © 2023 Meng, Wei, Wang, Bai, Wu, Gao, Xie, Zheng, Nie, Wei, Wang and Xie.