Open AccessAlgorithm for frequency capture and rectification in a low-orbit satellite IoT communication network
Author(s) -
Junan Shen,
Harry Liu,
Jing Wang,
Xia Jia
Publication year - 2021
Publication title -
mathematical biosciences and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.451
H-Index - 45
eISSN - 1551-0018
pISSN - 1547-1063
DOI - 10.3934/mbe.2021397
Subject(s) - frequency offset , offset (computer science) , doppler effect , computer science , compensation (psychology) , rectification , algorithm , utc offset , doppler frequency , control theory (sociology) , electronic engineering , real time computing , orthogonal frequency division multiplexing , physics , telecommunications , electrical engineering , engineering , global positioning system , artificial intelligence , psychology , channel (broadcasting) , control (management) , astronomy , psychoanalysis , programming language , voltage
In satellite communication systems, due to relative motion between satellites and that between satellites and the ground, the resulting Doppler frequency offset adversely affects communication synchronization. In this research, Doppler frequency offset compensation and phase offset compensation method eliminate the influence of the Doppler effect on synchronization. The proposed algorithm divides frequency estimate into two steps, coarse and precision. Finally, the corresponding frequency offset and phase offset compensation are performed. The simulation results show that the demodulated output results after frequency offset and phase offset compensation agree well with the original modulation data, indicating that the algorithm is valid and accurate.