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.
Highlights
O VER the last few decades, the continuous technological advances have enabled the exponential growth of wireless networks and several techniques have been proposed to use radio frequency (RF) spectrum and energy more efficiently as both are limited natural resources
In [10], the time switching relaying (TSR) and the power splitting relaying (PSR) protocols were proposed for an AF relaying network in which an energy-constrained relay harvests energy from the received RF signal and uses this energy to forward the information received from the source to the destination
The results show that when the number of primary transmitters is large, the detrimental effect of the interference from the primary users (PUs) outweighs the benefits of the energy that can be harvested from them
Summary
O VER the last few decades, the continuous technological advances have enabled the exponential growth of wireless networks and several techniques have been proposed to use radio frequency (RF) spectrum and energy more efficiently as both are limited natural resources. In [10], the time switching relaying (TSR) and the power splitting relaying (PSR) protocols were proposed for an AF relaying network in which an energy-constrained relay harvests energy from the received RF signal and uses this energy to forward the information received from the source to the destination. In this paper we extend the scenario presented in [19] to a scenario in which both the source and relay nodes are energyconstrained and harvest energy from the RF signals transmitted by the PU to support information transmission as in [20]. The contribution of this paper is twofold: first, an approximated expression is derived for the outage probability of the secondary network in a FD relaying cognitive radio network; and secondly, the performance in terms of outage probability of the proposed scheme is further improved through the use of multiple relays. The channel between the two antennas of the the FD relay can be seen as a fading channel with coefficient hr∗r∗ ∼ CN(0 , σr2∗r∗ ) and average power λr∗r∗ δ, where δ represents the interference cancellation factor which arises from the association of antenna isolation and interference cancellation techniques [14]
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