中圖分類號：TN929.1
文獻標識碼：A
DOI:10.19358/j.issn.2097-1788.2023.06.014
引用格式：李楚妤，王藝敏，徐智勇，等.基于SVM的跨湍流信道OOK調(diào)制光通信信號判決［J］.網(wǎng)絡安全與數(shù)據(jù)治理，2023，42（6）：85-89.

Optical communication signal detection for on-off key modulation of opticalcommunication signal across turbulent channels based on SVM

Abstract： Free space optical communication performs well in providing fast and stable data transmission, resistance to external interference and strong security. In the process of laser transmission in atmospheric channels, the communication performance is generally affected by atmospheric conditions, and the optical scintillation effect caused by atmospheric turbulence will lead to the deterioration of system link performance. In this paper, the decision method of onoff key modulation signal in free space optical communication under weak atmospheric turbulence channel is studied. Firstly, numerical simulation of real weak turbulence channel is carried out based on lognormal model. In view of the difficulties such as unknown channel conditions and mismatch between model training data and actual situation, data augmentation method is used to train and improve the decision performance of support vector machine. Then the decision ability across turbulent channels is improved. Experimental results preliminarily verify that data augmentation method can improve the effectiveness of SVM decision model in the case of channel mismatch.

Key words : free optical communication; onoff key regulation; channel robustness; support vector machine(SVM)