Leakage-probability-constrained secrecy capacity of a fading channel

Zhi Chen, Dapeng Wu, Pingyi Fan, Khaled Letaief

Research output: Contribution to journalArticle


Secure transmission of information over wireless channels in the presence of an eavesdropper has attracted much attention recently. Previous work assumes that a transmitter has perfect knowledge of the channel side information (CSI) of the legitimate channel and the eavesdropper's channel. To loosen this strong requirement, this paper considers the case where a transmitter has perfect knowledge of the CSI of the legitimate channel and only the average channel gain of the eavesdropper's channel. In this case, some information may be leaked to the eavesdropper because the eavesdropper's channel may have a higher gain than the legitimate channel. Hence, we propose, for the first time, to study leakage-probability-constrained secrecy capacity of a fading channel, that is, secrecy capacity under the constraint on leakage probability. We also propose an optimal power allocation strategy that maximizes leakage-probability-constrained secrecy capacity under average power constraint. Moreover, we study the impact of the bias of the average gain estimate of the eavesdropper's channel on leakage-probability-constrained secrecy capacity.

Original languageEnglish
Pages (from-to)583-593
Number of pages11
JournalSecurity and Communication Networks
Issue number6
Publication statusPublished - 2012
Externally publishedYes



  • Fading
  • Leakage probability
  • Nakagami-m fading
  • Rayleigh fading
  • Secrecy capacity

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems

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