Secrecy Outage Analysis of Multiuser Downlink Wiretap Networks with Potential Eavesdroppers

Woong Son, Hyunwoo Nam, Won Yong Shin, Bang Chul Jung

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We investigate the secrecy outage probability (SOP) of a downlink wiretap network consisting of a single legitimate base station (BS), multiple legitimate mobile stations (MSs), and multiple potential eavesdroppers (EVEs), where each EVE randomly attempts to overhear the data transmission with a certain probability. In particular, we consider an opportunistic feedback (OF) strategy in which each legitimate MS feeds their channel gain back to the BS for data reception only when its gain is greater than a certain threshold. We analyze a closed-form expression of the SOP under this strategy. As our main result, we demonstrate that the SOP of the OF strategy approaches that of the full feedback strategy as the number of legitimate MSs becomes large. It is worth noting that, for the first time, we mathematically characterize the SOP in this practical wiretap network setting having multiple potential EVEs.

Original languageEnglish
Article number9143436
Pages (from-to)3093-3096
Number of pages4
JournalIEEE Systems Journal
Issue number2
Publication statusPublished - 2021 Jun

Bibliographical note

Funding Information:
Manuscript received February 5, 2020; revised May 16, 2020 and June 23, 2020; accepted July 1, 2020. Date of publication July 17, 2020; date of current version June 7, 2021. This work was supported in part by the NRF through the Basic Science Research Program funded by the Ministry of Science and ICT under Grant NRF2019R1A2B5B01070697 and in part by the Yonsei University Research Fund of 2020 under Grant 2020-22-0101. (Corresponding authors: Won-Yong Shin; Bang Chul Jung.) Woong Son and Bang Chul Jung are with the Department of Electronics Engineering, Chungnam National University, Daejeon 34134, South Korea (e-mail:;

Publisher Copyright:
© 2020 IEEE.

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Information Systems
  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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