Performance Analysis of a Full-Duplex Energy Harvesting Cognitive Wireless Network

Abstract

The performance of a full-duplex cooperative cognitive network is investigated under Nakagami-m fading. The secondary source and the relays are energy-constrained nodes and harvest energy from the primary network to transmit their information. The direct link between source and destination in the secondary network is considered as useful information at destination where joint-decoding is applied upon the signals received from source and relay. We derive an approximated closed-form expression for the outage probability of the proposed scheme. Results show that the proposed scheme outperforms the half-duplex and direct transmission schemes in the particular scenarios under consideration. Moreover, the performance in terms of outage probability of the proposed scheme is further improved through the use of multiple relays.

Approximations for the product, ratio, and sum ofα‐μrandom variables with application in the analysis of cognitive radio networks

“…The goal is to explore an application in which the product, ratio, and sum of α ‐ μ RVs are involved. The investigation expands results introduced in Pereira et al, 32 and it is only briefly presented here. The interested reader should refer to Duong et al, 15 Pereira et al, 32 and Liu et al 35 for a more detailed analysis.…”

“…Figure 4 also shows the residual self‐interference observed at relay R ∗ during full duplex mode, which is treated distinctly. The channel between the relay's antennas is modeled by a circularly symmetric complex Gaussian distribution with zero mean and variance 32 . Therefore, the envelope gain is given as and average power gain as .…”

“…A large number of recent works in the literature addresses the use of cooperative cognitive networks. [28][29][30][31] The one considered here is based on the system model presented in Pereira et al 32 and is detailed later in this manuscript.…”

“…The channel between the relay's antennas is modeled by a circularly symmetric complex Gaussian distribution with zero mean and variance 𝜎 2 r * r * . 32 Therefore, the envelope gain is given as h r * r * ∼  (0, 𝜎 2 r * r * ) and average power gain as 𝜆 r * r * .…”

“…In the energy harvesting full-duplex with joint decoding scheme, illustrated in Figure 5, the source S broadcasts its information at the same time that the selected relay R * transmits the previous time-slot information to the destination D. Also, similarly to Pereira et al, 32 it is considered that the direct link conveys useful information. Therefore, the overall outage probability can be expressed as…”