Free-space optical channel estimation for physical layer security

Hiroyuki Endo, Mikio Fujiwara, Mitsuo Kitamura, Toshiyuki Ito, Morio Toyoshima, Yoshihisa Takayama, Hideki Takenaka, Ryosuke Shimizu, Nicola Laurenti, Giuseppe Vallone, Paolo Villoresi, Takao Aoki, Masahide Sasaki

    Research output: Contribution to journalArticle

    25 Citations (Scopus)


    We present experimental data on message transmission in a free-space optical (FSO) link at an eye-safe wavelength, using a testbed consisting of one sender and two receiver terminals, where the latter two are a legitimate receiver and an eavesdropper. The testbed allows us to emulate a typical scenario of physical-layer (PHY) security such as satellite-to-ground laser communications. We estimate information-theoretic metrics including secrecy rate, secrecy outage probability, and expected code lengths for given secrecy criteria based on observed channel statistics. We then discuss operation principles of secure message transmission under realistic fading conditions, and provide a guideline on a multi-layer security architecture by combining PHY security and upper-layer (algorithmic) security.

    Original languageEnglish
    Pages (from-to)8940-8955
    Number of pages16
    JournalOptics Express
    Issue number8
    Publication statusPublished - 2016 Apr 18

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics

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  • Cite this

    Endo, H., Fujiwara, M., Kitamura, M., Ito, T., Toyoshima, M., Takayama, Y., Takenaka, H., Shimizu, R., Laurenti, N., Vallone, G., Villoresi, P., Aoki, T., & Sasaki, M. (2016). Free-space optical channel estimation for physical layer security. Optics Express, 24(8), 8940-8955.