TY - JOUR
T1 - Secrecy Outage Minimization for Wireless-Powered Relay Networks with Destination-Assisted Cooperative Jamming
AU - Lee, Kisong
AU - Bang, Junseong
AU - Choi, Hyun Ho
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - To solve security vulnerability and energy scarcity problems in relay, we propose two secure relaying protocols, power splitting-based relaying (PSR) and time switching-based relaying (TSR), in a wireless-powered relay network with destination-assisted cooperative jamming. In these protocols, the relay adaptively controls the amount of energy harvested from the received signals using PS or TS policy, considering information leakage to the eavesdropper. We first prove the convexity of the secrecy outage probability with respect to the PS ratio ( \rho ) and TS ratio ( \alpha ), and then derive the closed-form expressions of the optimal \rho and \alpha for minimizing secrecy outage under the signal-to-noise ratio (SNR) assumption. Numerical results reveal that the proposed PSR and TSR protocols using the derived \rho and \alpha can achieve near-optimal performance in terms of secrecy outage. It is observed that the optimal \rho and \alpha do not depend on the eavesdropping channels in a high SNR regime such that the near-optimal secrecy outage can be achieved practically without knowledge of the eavesdropper location. Furthermore, intensive simulations reveal that it is advantageous to allocate more power to energy harvesting for PSR, whereas more time to signal processing for TSR to minimize secrecy outage.
AB - To solve security vulnerability and energy scarcity problems in relay, we propose two secure relaying protocols, power splitting-based relaying (PSR) and time switching-based relaying (TSR), in a wireless-powered relay network with destination-assisted cooperative jamming. In these protocols, the relay adaptively controls the amount of energy harvested from the received signals using PS or TS policy, considering information leakage to the eavesdropper. We first prove the convexity of the secrecy outage probability with respect to the PS ratio ( \rho ) and TS ratio ( \alpha ), and then derive the closed-form expressions of the optimal \rho and \alpha for minimizing secrecy outage under the signal-to-noise ratio (SNR) assumption. Numerical results reveal that the proposed PSR and TSR protocols using the derived \rho and \alpha can achieve near-optimal performance in terms of secrecy outage. It is observed that the optimal \rho and \alpha do not depend on the eavesdropping channels in a high SNR regime such that the near-optimal secrecy outage can be achieved practically without knowledge of the eavesdropper location. Furthermore, intensive simulations reveal that it is advantageous to allocate more power to energy harvesting for PSR, whereas more time to signal processing for TSR to minimize secrecy outage.
KW - Cooperative jamming
KW - energy harvesting (EH)
KW - physical-layer security
KW - secrecy outage probability
KW - secure relaying protocol
UR - http://www.scopus.com/inward/record.url?scp=85100270257&partnerID=8YFLogxK
U2 - 10.1109/JIOT.2020.3013573
DO - 10.1109/JIOT.2020.3013573
M3 - Article
AN - SCOPUS:85100270257
SN - 2327-4662
VL - 8
SP - 1467
EP - 1476
JO - IEEE Internet of Things Journal
JF - IEEE Internet of Things Journal
IS - 3
M1 - 9154423
ER -