Opportunistic Relaying and Random Linear Network Coding for Secure and Reliable Communication

Amjad Saeed Khan, Ioannis Chatzigeorgiou

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


Opportunistic relaying has the potential to achieve full diversity gain, while random linear network coding (RLNC) can reduce latency and energy consumption. In recent years, there has been a growing interest in the integration of both schemes into wireless networks in order to reap their benefits, while considering security concerns. This paper considers a multi-relay network, where relay nodes employ RLNC to encode confidential data and transmit coded packets to a destination in the presence of an eavesdropper. Four relay selection protocols are studied covering a range of network capabilities, such as the availability of the eavesdropper's channel state information or the possibility to pair the selected relay with a node that intentionally generates interference. For each case, expressions for the probability that a coded packet will not be recovered by a receiver, which can be either the destination or the eavesdropper, are derived. Based on those expressions, a framework is developed that characterizes the probability of the eavesdropper intercepting a sufficient number of coded packets and partially or fully recovering the confidential data. Simulation results confirm the validity and accuracy of the theoretical framework and unveil the security-reliability trade-offs attained by each RLNC-enabled relay selection protocol.
Original languageEnglish
Pages (from-to)223 - 234
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number1
Early online date24 Oct 2017
Publication statusPublished - Jan 2018
Externally publishedYes

Bibliographical note

This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/


  • Relay selection
  • random linear network coding
  • physical-layer security
  • outage probability
  • intercept probability

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