Cooperative jamming is an approach that has been recently proposed for improving physical layer based security for wireless networks in the presence of an eavesdropper. While the source transmits its message to its destination, a relay node transmits a jamming signal to create interference at the eavesdropper. In this paper, a scenario in which the relay is equipped with multiple antennas is considered. A novel system design is proposed for determining the antenna weights and transmit power of source and relay, so that the system secrecy rate is maximized subject to a total transmit power constraint, or, the transmit power is minimized subject to a secrecy rate constraint. Since the optimal solutions to these problems are difficult to obtain, suboptimal closed-form solutions are proposed that introduce an additional constraint, i.e., the complete nulling of jamming signal at the destination.
Dong et al. REF consider CJ as an approach to improve the PLS in the practical system design where a suboptimal closed-form solution was proposed to null the jamming signal at the desired destination.
Cooperative jamming for wireless physical layer security
2009 IEEE/SP 15th Workshop on Statistical Signal Processing
2009 IEEE/SP 15th Workshop on Statistical Signal Processing
Computer Science Mathematics