Computer Science – Information Theory
Scientific paper
2009-07-28
Computer Science
Information Theory
4 pages, 3 figures, in Proceedings of IEEE Workshop on Statistical Signal Processing (SSP 2009), Cardiff, Wales, UK, Aug. - Se
Scientific paper
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 Lun
Han Zhangang
Petropulu Athina P.
Poor Harold Vincent
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