Relay-Assisted Satellite QKD Systems using MMW Radio-over-FSO for Vehicular Networks

  • Thu Anh Pham Posts and Telecommunications Institute of Technology
  • Ngoc T. Dang Posts and Telecommunications Institute of Technology


This paper aims at proposing a novel satellite quantum key distribution (QKD) system for vehicular networks. Quantum key from a satellite (i.e., a trusted node) is transmitted through a free-space optical (FSO) channel to a high-attitude platform (HAP) using radio-over-FSO (RoFSO) technique. HAP playing a role as a relaying node forwards the key to moving vehicles via millimeter-wave (MMW) channel. Key information generated is encoded on MMW subcarrier using binary phase shift keying (BPSK) signaling and then recovered at the receiver thanks to a dual-threshold detector. We derive the mathematical expressions for security analysis of the proposed QKD system in terms of quantum bit error rate and ergodic secret-key rate taking into account the channel loss and receiver noise. The numerical results confirm the feasibility of the proposed QKD system.


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How to Cite
PHAM, Thu Anh; DANG, Ngoc T.. Relay-Assisted Satellite QKD Systems using MMW Radio-over-FSO for Vehicular Networks. Journal of Science and Technology: Issue on Information and Communications Technology, [S.l.], v. 18, n. 12.2, p. 31-37, dec. 2020. ISSN 1859-1531. Available at: <>. Date accessed: 24 mar. 2023. doi: