Walsh-coded orthogonal chaotic shift keying for key distribution in visible light communication systems


In contemporary society, secure communications employing chaotic communication schemes have opened new challenges. Chaotic communication schemes in which signals are spectrally spread, with low power spectral density, become useful to improve resilience against multipath fading, making them increasingly important for indoor applications in the framework of visible light communication (VLC). Here, we will explore the 16-QAM orthogonal shift key in combination with Walsh coded chaotic basis for application of a secure VLC link, used simultaneously for illumination and security-enhanced data transmission. The experimental results are carried out for a 12 Baud symbol rate, indicating a symbol error rate below the FEC hard threshold limit for an optical irradiance higher than 25 mW/cm(2), covering a 1.4 m(2) operating area.



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Silverio, T; Figueiredo, G; Ferreira, RAS; Andre, PS

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This work was developed within the scope of the project CICECO-Aveiro Institute of Materials (UIDB/50011/2021 & UIDP/50011/2021), Instituto de Telecomunicacoes (UIDB/50008/2021), and WINLEDs (POCI-01-0145-FEDER-030351) projects financed by national funds through the FCT/MEC, Portugal and when appropriate co-financed by FEDER, Spain under the PT2020 Partnership through European Regional Development Fund in the frame of Operational Competitiveness and Internationalization Programme. Tiago Silverio thanks the grant financed by the SOLARFLEX project, Portugal (CENTRO-010145-FEDER-030186). The authors also thank V.T. Freitas from the Lightenjin Company for supplying the LED lamp.

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