Abstract
This paper investigates the secrecy performance of full-duplex relay (FDR) networks. The resulting analysis shows that FDR networks have better secrecy performance than half duplex relay networks, if the self-interference can be well suppressed. We also propose a full duplex jamming relay network, in which the relay node transmits jamming signals while receiving the data from the source. While the full duplex jamming scheme has the same data rate as the half duplex scheme, the secrecy performance can be significantly improved, making it an attractive scheme when the network secrecy is a primary concern. A mathematic model is developed to analyze secrecy outage probabilities for the half duplex, the full duplex and full duplex jamming schemes, and the simulation results are also presented to verify the analysis.
Highlights
Unlike a traditional cryptographic system [1], physical layer security is based on Shannon theory using channel coding to achieve secure transmission [2]– [7]
If the capacity of the intended data transmission channel is higher than that of the eavesdropping channel, the data can be transmitted at a rate close to the intended channel capacity so that only the intended receiver can successfully decode the data. This is the principle of physical layer security, where the level of security is quantified by the secrecy capacity which is the capacity difference between the intended data transmission and eavesdropping channels
HALF DUPLEX SECRECY RELAY NETWORK we derive the secrecy outage probability of the half duplex secrecy network, which is used as a baseline to compare with a full duplex scheme and the newly proposed full duplex jamming scheme
Summary
Unlike a traditional cryptographic system [1], physical layer security is based on Shannon theory using channel coding (rather than encryption) to achieve secure transmission [2]– [7]. In [20], it is the eavesdropper that is equipped with the full duplex technology, so that the eavesdropper can minimize the secrecy by receiving the data from the source and transmitting jamming signals to the intended receiver at the same time These approaches consider the secrecy performance of a point-to-point full duplex system, and little work has been done for the full duplex relay network. In the full duplex network, the eavesdropper simultaneously receives signals from the source and relay which interfere with each other, making it harder for the eavesdropper to decode the data This decreases the eavesdropping capacity, and improves the secrecy performance. The detail of this issue is beyond the scope of this paper and will be left as an interesting topic for future study
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