Research on Adaptive Coding Modulation Technique of Atmospheric Optical Communication Based on LDPC Code

Aiming at the problem that the transmission mode switching threshold is not accurate due to turbulence in atmospheric optical communication, a threshold switching selection method based on LDPC coding combined with BPSK modulation is proposed. The performance of lognormal channel model under weak tu...

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Vydané v:International Conference on Advanced Infocomm Technology (Online) s. 171 - 176
Hlavní autori: Guo, Yuyou, Liu, Zhi, Yao, Haifeng, Jiang, Qingfang, Liang, Hongyan
Médium: Konferenčný príspevok..
Jazyk:English
Vydavateľské údaje: IEEE 13.10.2023
Predmet:
Adaptive code modulation
Atmospheric modeling
Atmospheric optical communication
Bit error rate
Encoding
LDPC coding
Monte Carlo methods
Optical fiber communication
Optical switches
Simulation
Threshold switching
Weak turbulence
ISSN:2770-1603
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Shrnutí:Aiming at the problem that the transmission mode switching threshold is not accurate due to turbulence in atmospheric optical communication, a threshold switching selection method based on LDPC coding combined with BPSK modulation is proposed. The performance of lognormal channel model under weak turbulence conditions was analyzed, Monte Carlo method was used to simulate weak turbulence channel fading, and the formula for the relationship between turbulence intensity and signal-to-noise ratio threshold was given. The logarithmic variance of light intensity scintillation index was used as the turbulence intensity index, and the simulated weak turbulence intensity was 0,0.05, 0.15. The relationship between bit error rate and SNR of three transmission modes under 10 −5 1e-5 is obtained, and the threshold switching interval of three transmission modes is obtained when the expected bit error rate of the system is. The simulation results show that the proposed method can dynamically switch transmission modes according to channel changes, and accurately realize the requirement of bit error rate of the system.
ISSN:2770-1603
DOI:10.1109/ICAIT59485.2023.10367294