… framework for cooperative downlink and uplink NOMA transmissions in the presence of
an untrusted relay, where a source uses the NOMA principle to have downlink and uplink …

… We consider a downlink transmission with a single-antenna relay as shown in Fig. 1(a),
where a source (denoted as S) transmits confidential information to a destination (denoted as D) …

… downlink transmission in multiuser relay networks, where a source communicates with multiple
users via a relay … eavesdropping attacks, ie, the systems with untrusted relays [20]-[22]. In […

… [14] proposed a destination-aided cooperative jamming scheme to … untrusted relay system
where two sources S1 and S2 intend to exchange messages via the help of an untrusted relay …

… We consider a downlink NOMA system … cooperative trusted relays help securing the data
from an external eavesdropper, and then we investigate the case of having an untrusted relay …

… energy cooperation transmission strategy is proposed for spectrum sharing networks with
untrusted cooperative dual-relay. Furthermore, we consider two scenarios that the untrusted …

… Motivated by the previous observations, in this paper, we propose an enhanced secrecy
performance of uplink/ downlink cooperative TWR NOMA network against untrusted …

… Conventional studies on two-way relay generally considered … to provide incentives for relay
cooperation since the relay may not be … “Cooperative privacy preserving scheme for downlink …

… the untrusted relay. The design of secure cooperative communications with untrusted relays
… SECRECY IN SINGLE-ANTENNA RELAYING We consider a downlink transmission with a …

… CSIs to S via relay-aided cooperation, while they are untrustworthy in terms of retransmitting
… the untrusted relays and the passive Eve. We further assume that the untrusted relays are …