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This is due to the use of two relays in TPSR which provide additional diversity and full-duplex bandwidth efficiency. In contrast to previous results in Figure 3, where the FDR has lower probability of secrecy outage than the HDR and FDJ. GSK-3 inhibitor This is because the ��1/2�� pre-log factor in achievable secrecy rate of HDR and FDJ in Equations (24) and (28). The jamming technique benefits the FDJ by delivering lower probability of secrecy outage than HDR. Figure 5 Secrecy outage probability versus target secrecy rate, r where ��sr=��rd=40dB, ��se=��re=10dB and the inter-relay interference or self-interference, ��rr=0dB. Figure 6 shows the secrecy outage probability versus inter-relay interference or self-interference, ��rr for various schemes when target secrecy rate, r=2bits/s/Hz, ��se=��re=10dB and ��sr=��rd=40dB. The TPSR has the lowest probability of secrecy outage compared to the FDR and FDJ. In other words, with the same ��rr, TPSR is more secure than the FDR and FDJ. By considering the HDR as baseline scheme, when ��rr=10dB, the TPSR has lower probability of secrecy outage, whereas the FDR and FDJ have higher probability of secrecy outage. This shows that the FDR and FDJ require much lower ��rr compared to the TPSR to achieve lower probability of secrecy outage than the HDR. As a result, buy Y-27632 the FDR and FDJ have a stricter requirement on residual interference compared to the TPSR. Figure 6 Outage probability versus inter-relay interference or self-interference, ��rr where Fleroxacin target secrecy rate, r=2bits/s/Hz, ��se=��re=10dB and ��sr=��rd=40dB. 6. Conclusions In this paper, two-path successive relaying (TPSR) is proposed to improve the security of wireless transmission. We compare the ergodic achievable secrecy rate, interception probability and secrecy outage probability of the proposed TPSR against the existing half-duplex relaying (HDR), full-duplex relaying (FDR) and full-duplex jamming (FDJ). The numerical results reveal that the proposed TPSR achieves the same ergodic achievable secrecy rate as the FDR. The TPSR also delivers the lowest probability of interception and secrecy outage compared to the other schemes due to the full-duplex bandwidth efficiency and the two mutually independent links assisted by relay pair R1 and R2. The intercept probabilities of TPSR and FDR are analyzed and verified with simulation. The analysis shows that the intercept probability of TPSR is quadratically lower than the intercept probability of FDR. The numerical results show the TPSR has the lowest probability of interception compared to all other schemes when the inter-relay interference, ��rr