Delay-constrained covert communications with a full-duplex receiver

Feng Shu, Tingzhen Xu, Jinsong Hu, Shihao Yan

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this letter, we consider delay-constrained covert communications with the aid of a full-duplex (FD) receiver. Without delay constraints, it has been shown that the transmit power of artificial noise (AN) at the FD receiver should be random in order to enhance covert communications. In this letter, we show that transmitting AN with a fixed power indeed improve covert communications with delay constraints, since in a limited time period the warden cannot exactly learn its received power. This explicitly shows one benefit of considering practical delay constraints in the context of covert communications. We analyze the optimal transmit power of AN for either fixed or globally optimized transmit power of covert information, based on which we also determine the specific condition under which transmitting AN by the FD receiver can aid covert communications and a larger transmit power of AN always leads to better covert communication performance.
Original languageEnglish
Pages (from-to)813-816
Number of pages4
JournalIEEE Wireless Communications Letters
Volume8
Issue number3
DOIs
Publication statusPublished - Jun 2019

Keywords

  • artificial noise
  • Covert communication
  • delay constraint
  • full-duplex
  • transmit power

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