Artificial-noise-aided secure transmission in wiretap channels with transmitter-side correlation

Shihao Yan, Xiangyun Zhou, Nan Yang, Biao He, Thushara D. Abhayapala

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


This paper, for the first time, examines the impact of transmitter-side correlation on the artificial-noise (AN)-aided secure transmission, based on which a new power allocation strategy for AN is devised for physical layer security enhancement. Specifically, we design a correlation-based power allocation (CPA) for AN, of which the optimality in terms of achieving the minimum secrecy outage probability is analytically proved in the large system regime with the number of transmit antennas approaching infinity. In order to fully reveal the benefits of the CPA, we derive easy-to-evaluate expressions for the secrecy outage probability achieved by the CPA. Our study demonstrates that the CPA is nearly optimal and significantly outperforms the widely used uniform power allocation (UPA) even for a moderately small number of correlated transmit antennas. Furthermore, our numerical results reveal a fundamental difference between the CPA and UPA. That is when the number of correlated transmit antennas increases, the secrecy outage probability of the CPA always reduces while the secrecy outage probability of the UPA suffers from a saturation point.
Original languageEnglish
Pages (from-to)8286-8297
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number12
Publication statusPublished - Dec 2016
Externally publishedYes


  • artificial noise
  • Physical layer security
  • power allocation
  • transmitter-side correlation


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