Jammer selection for secure two-way DF relay communications with imperfect CSI

Abstract

Abstract-This paper investigates jammer selection in a twoway decode-and-forward (DF) relay network with imperfect channel state information (CSI). The proposed scheme enables an selection of one conventional relay and two jamming nodes to enhance communication security against eavesdropper. The conventional relay assists two sources to exchange their data via a DF protocol. The two jamming nodes are used to create interference signals to confuse the eavesdropper. Furthermore, the asymptotic performance of proposed scheme is analyzed in detail. Under the assumption that the relay can decode received signals perfectly and when the jamming power is higher than that of source nodes, we find that the proposed scheme has a high secrecy performance which is almost independent of the position of the eavesdropper.

Leakage rate‐based untrustworthy relay selection with imperfect channel state information: the outage and security trade‐off analysis

“…By using (11) and (12), the LR expressions with respect to x can be calculated for the CEE and F-D cases as in (13) and (14), respectively…”

“…Likewise, Cao et al [11] compared the conventional round-robin-based scheduling and a joint source-relay selection strategy, based on maximising the instantaneous capacity, for improving the PHY security. Wang et al [12] proposed a jammer selection strategy with imperfect CSI, which is based on selecting the minimum secrecy rate and maximise it, to enhance the system security against the eavesdropper. Sun et al [13] considers a HD-based two-way relaying (TWR) system model structure in the presence of a single eavesdropper.…”

Secure Transmission Schemes for Two-Way Relay Networks

“…In Phase 1, the two source nodes transmits data to relays; in Phase 2, the relays retransmit a weighted version of the data they heard in Phase 1 to their corresponding destination nodes. We use the amplify-and-forward (AF) protocol here, while in some papers, decode-and-forward (DF) protocol was considered [12], [13].…”