Improving Physical Layer Security in AF Relay Networks via Beam-forming and Jamming

Research output: Research - peer-reviewConference contribution

  • Authors:
  • Abdelhamid Salem
  • Khairi Hamdi


In this paper the cooperation of beam-forming and artificial noise (AN) in two-hop amplify-and- forward (AF) relaying system is proposed to enhance the security. we consider a half duplex AF relaying network with a multi-antenna source node and a destination in the presence of a passive eavesdropper.Since channel state information (CSI) of the eavesdropper is unknown, the AN transmitted by the source in the first phase and by the relays in the second phase is in all directions except the legitimate node one. As such two scenarios are considered here,: i) when all the relays amplify and forward the information source signal ii) when only the best relay is selected to amplify and forward the information source signal. The beam-former weights and the power allocation are obtained by solving an optimization problem. Results reveal that the proposed system can provide considerable improvements in terms of secrecy rate. It is also found that increasing the AN power, relative to the information signal power, will further improve the secrecy rate.

Bibliographical metadata

Original languageEnglish
Title of host publicationVehicular Technology Conference (VTC-Fall), 2016 IEEE 84th
StatePublished - 20 Mar 2017
Event IEEE 84th Vehicular Technology Conference - Hotel Montreal Bonaventure, Montreal, Canada
Duration: 18 Sep 201621 Sep 2016


Conference IEEE 84th Vehicular Technology Conference
Abbreviated titleVTC2016-Fall
Internet address