Abstract
In the present paper, we investigate the performance of the simultaneous wireless information and power transfer (SWIPT) based cooperative cognitive radio networks (CCRNs). In particular, the outage probability is derived in the closed-form expressions under the opportunistic partial relay selection. Different from the conventional CRNs in which the transmit power of the secondary transmitters count merely on the aggregate interference measured on the primary networks, the transmit power of the SWIPT-enabled transmitters is also constrained by the harvested energy. As a result, the mathematical framework involves more correlated random variables and, thus, is of higher complexity. Monte Carlo simulations are given to corroborate the accuracy of the mathematical analysis and to shed light on the behavior of the OP with respect to several important parameters, e.g., the transmit power and the number of relays. Our findings illustrate that increasing the transmit power and/or the number of relays is beneficial for the outage probability.
Highlights
Cognitive radio networks (CRNs) are considered one of the most effective solutions to overcome the scarcity of the frequency spectrum [1,2]
Different from the abovementioned works, we focus on the performance of the secondary networks as well as the reliability of simultaneous wireless information and power transfer (SWIPT)-based underlay cooperative cognitive radio networks with regard to transceiver design, power allocation, and physical layer security
Computer-based simulation results are given to verify the correctness of the derived mathematical framework and to discover the behaviors of Outage Probability (OP) with respect to several essential system parameters, namely, the transmit power, the number of relays, the power splitting ratio, and so forth
Summary
Cognitive radio networks (CRNs) are considered one of the most effective solutions to overcome the scarcity of the frequency spectrum [1,2]. The principal idea of CRNs is to permit unlicensed users to concurrently operate with licensed users while strictly guaranteeing the quality-of-service (QoS) of primary users To realize such networks two popular protocols are proposed in the literature, namely, the overlay and underlay protocols [3,4]. In the present paper, we investigate the performance of the SWIPT-based cooperative cognitive radio networks (CCRNs) with the help of multiple relays. The authors in [15], on the other hand, investigated the secrecy performance of the underlay cooperative multihop CRNs. In particular, the secrecy outage probability (SOP) was derived in the approximated closed-form expression. Different from the abovementioned works, we focus on the performance of the secondary networks as well as the reliability of SWIPT-based underlay cooperative cognitive radio networks with regard to transceiver design, power allocation, and physical layer security.
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