Secure wireless communications via cooperation
- 1 September 2008
- conference paper
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1132-1138
- https://doi.org/10.1109/allerton.2008.4797687
Abstract
The feasibility of physical-layer-based security approaches for wireless communications in the presence of one or more eavesdroppers is hampered by channel conditions. In this paper, cooperation is investigated as an approach to overcome this problem and improve the performance of secure communications. In particular, a decode-and-forward (DF) based cooperative protocol is considered, and the objective is to design the system for secrecy capacity maximization or transmit power minimization. System design for the DF-based cooperative protocol is first studied by assuming the availability of global channel state information (CSI). For the case of one eavesdropper, an iterative scheme is proposed to obtain the optimal solution for the problem of transmit power minimization. For the case of multiple eavesdroppers, the problem of secrecy capacity maximization or transmit power minimization is in general intractable. Suboptimal system design is proposed by adding an additional constraint, i.e., the complete nulling of signals at all eavesdroppers, which yields simple closed-form solutions for the aforementioned two problems. Then, the impact of imperfect CSI of eavesdroppers on system design is studied, in which the ergodic secrecy capacity is of interest.Keywords
This publication has 14 references indexed in Scilit:
- Secure Communication Over Fading ChannelsIEEE Transactions on Information Theory, 2008
- Secret Communication via Multi-antenna TransmissionPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2007
- Secret communication using artificial noisePublished by Institute of Electrical and Electronics Engineers (IEEE) ,2006
- Secrecy capacity of SIMO and slow fading channelsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2005
- Cooperative Diversity in Wireless Networks: Efficient Protocols and Outage BehaviorIEEE Transactions on Information Theory, 2004
- Convex OptimizationPublished by Cambridge University Press (CUP) ,2004
- Secure space-time communicationIEEE Transactions on Information Theory, 2003
- The Gaussian wire-tap channelIEEE Transactions on Information Theory, 1978
- Broadcast channels with confidential messagesIEEE Transactions on Information Theory, 1978
- The Wire-Tap ChannelBell System Technical Journal, 1975