Secrecy Performance for Multiple Untrusted Relay Networks Using Destination-Based Jamming with Direct Link

Abstract

We propose a destination-based jamming scheme for cooperative networks with multiple untrusted amplify-and-forward relays, in which the destination operates in full-duplex mode so as to enable simultaneous reception of the information coming directly from the source and the transmission of jamming signals to the untrusted relay. An approximate analytical expression for the secrecy outage probability, under the effect of residual self-interference at the destination, is presented. The developed analysis is verified through Monte Carlo simulations.

Impact of Outdated CSI on the Secrecy Performance of Multiple Untrusted Relay Networks with Direct Link and Destination-Based Jamming

“…2 illustrates the secrecy outage probability versus the transmitted system SNR , for different number of relays. Simulations were performed by considering different values of the correlation factor and , as well as the case with perfect CSI presented in [13]. As expected, the case does not present impact regarding the value of as no relay selection process is performed.…”

“…In certain types of networks, such as heterogeneous networks, where the nodes have different levels of clearance, the relay node may try to extract useful information from the legitimate communication between source and relay to use it for its own benefit. In light of this, recently, many works have addressed scenarios considering untrusted relay nodes [9]- [13]. In particular, in [9], a source-based jamming technique was evaluated in combination with power allocation to improve the security in a network with one untrusted relay and the presence of direct link between source and destination.…”

“…Also, in [12] a cooperative network with a multiple-antenna source, a multiple-antenna destination, multiple untrusted relays, and external eavesdroppers was considered, where both source and destination transmit jamming signals in different phases of the communication process. In [13], a destination-based jamming for cooperative networks with multiple untrusted relays is evaluated considering the presence of the direct link.…”

“…On the other hand, except for the works in [9], [13] and [18], a common limitation for the above mentioned studies is that the direct link is neglected. In this paper, we aim to partially fill this gap by investigating the secrecy performance of a multiple untrusted AF relaying network, where the direct link is exploited as an additional path of information.…”

“…In this paper, we aim to partially fill this gap by investigating the secrecy performance of a multiple untrusted AF relaying network, where the direct link is exploited as an additional path of information. Opposite to [13] a perfect knowledge of the CSI is not available and different from [9] and [18], we consider a destinationbased jamming technique. To make this possible, a destination with full-duplex (FD) communication capability is considered in order to enable the reception of the information coming from the source, concurrently with the transmission of a jamming signal to interfere the untrusted relays.…”