Enhancing physical-layer security in wireless communications using signal space diversity


Yusuf M., ARSLAN H.

35th IEEE Military Communications Conference, MILCOM 2016, Maryland, United States Of America, 1 - 03 November 2016, pp.1190-1194 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Doi Number: 10.1109/milcom.2016.7795492
  • City: Maryland
  • Country: United States Of America
  • Page Numbers: pp.1190-1194
  • Keywords: Communication system security, Constellation diagram, Diversity methods, Fading channels, OFDM, Security, Wireless communication
  • Istanbul Medipol University Affiliated: Yes

Abstract

In this paper, we enhance the security of OFDM systems in frequency selective fading channels using signal space diversity. In rich multipath environments, spatially separated channels are independent to each other. Hence, by adapting the interleaving pattern to the channel of the legitimate user, more diversity gain is provided to the legitimate user compared to an eavesdropper. This ensures secrecy in a time division duplex system, where the eavesdropper has no information regarding the channel of the legitimate user. The scheme can also be used in the conventional frequency division duplex system, which is more challenging in terms of security aspects because of the channel state information leakage. We verify the gain of our scheme by showing the improvement in the bit error rate performance.