TY - JOUR
T1 - Cooperative Spectrum Sharing on SWIPT-Based DF Relay
T2 - An Energy-Aware Retransmission Approach
AU - Li, Qiang
AU - Zhang, Xueyan
AU - Pandharipande, Ashish
AU - Zhang, Jiliang
N1 - Funding Information:
This work was supported in part by the Natural Science Foundation of China (NSFC) under Grant 61971461, and in part by the National Key Research and Development Program of China under Grant 2016YFE0133000.
Publisher Copyright:
© 2013 IEEE.
PY - 2019
Y1 - 2019
N2 - In this paper, cooperative cognitive radio networks are considered, in which a primary user (PU) and an off-the-grid secondary user (SU) co-exist by exploiting simultaneous wireless information and power transfer. Based on a two-phase relaying model, adaptive power splitting is performed at the SU for information decoding while collecting the energy remaining in the first phase. The energy harvested is then used to forward the decoded primary signal, with the secondary signal superimposed in the second phase. To enhance the utilization of both the spectrum and energy, an energy-aware retransmission approach is proposed for enabling successful decoding at the SU while collecting a reasonable amount of energy for relaying. The outage probability and throughput are theoretically analyzed for both the PU and the SU. To provide more analytical insights, tight performance upper and lower bounds are obtained in closed forms. Our results demonstrate that a mutually beneficial relationship can be built between the PU and the SU under proper parameter configurations. Furthermore, a performance tradeoff with respect to the number of retransmissions is demonstrated, where additional performance gains can be achieved by the proposed retransmission approach under unfavorable conditions of high rate, low power, and weak channels.
AB - In this paper, cooperative cognitive radio networks are considered, in which a primary user (PU) and an off-the-grid secondary user (SU) co-exist by exploiting simultaneous wireless information and power transfer. Based on a two-phase relaying model, adaptive power splitting is performed at the SU for information decoding while collecting the energy remaining in the first phase. The energy harvested is then used to forward the decoded primary signal, with the secondary signal superimposed in the second phase. To enhance the utilization of both the spectrum and energy, an energy-aware retransmission approach is proposed for enabling successful decoding at the SU while collecting a reasonable amount of energy for relaying. The outage probability and throughput are theoretically analyzed for both the PU and the SU. To provide more analytical insights, tight performance upper and lower bounds are obtained in closed forms. Our results demonstrate that a mutually beneficial relationship can be built between the PU and the SU under proper parameter configurations. Furthermore, a performance tradeoff with respect to the number of retransmissions is demonstrated, where additional performance gains can be achieved by the proposed retransmission approach under unfavorable conditions of high rate, low power, and weak channels.
KW - adaptive power splitting
KW - Cooperative cognitive radio networks
KW - decode-and-forward
KW - energy-aware retransmission
KW - simultaneous wireless information and power transfer
UR - http://www.scopus.com/inward/record.url?scp=85075516443&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2019.2937602
DO - 10.1109/ACCESS.2019.2937602
M3 - Article
AN - SCOPUS:85075516443
SN - 2169-3536
VL - 7
SP - 120802
EP - 120816
JO - IEEE Access
JF - IEEE Access
M1 - 8813089
ER -