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access icon free Primary behaviour-based energy harvesting multihop cognitive radio network

© The Institution of Engineering and Technology
Received 07/03/2017, Accepted 04/08/2017, Revised 06/07/2017, Published 11/08/2017

In this study, a multihop transmission scheme in cognitive environment is investigated. Several number of decode and forward relays are deployed between the secondary source and the secondary destination. All the nodes harvest energy using a time splitting-based relaying scheme from radio-frequency signal of a primary beacon (PB). All the nodes use harvested energy to transmit data from a node to its next node. The maximum transmit power of any secondary node is limited by interference constraint at a primary receiver. The presence of PB is considered in the form of a regular periodic pattern. An expression for signal-to-noise ratio and ergodic capacity at each secondary node in the multihop network are derived. A closed form expression for the outage probability (OP) of the secondary network is derived for transient and steady-state condition in two different scenarios of arrival time period of PB (). The closed-form expression for the OP of the secondary network is validated with the simulation results for different system parameters such as harvesting efficiency, harvesting time, the number of SRs, the transmission power of PB. An optimum value of the presence duration of PB within the time period is also estimated. Further, impact of imperfect channel state information (CSI) of interfering links between secondary transmitting nodes and primary receiver is investigated on secondary OP and compared with the case of perfect CSI.

Inspec keywords: radiofrequency interference; decode and forward communication; energy harvesting; relay networks (telecommunication); cognitive radio; error statistics

Other keywords: secondary destination; primary receiver; signal-to-noise ratio; channel state information; outage probability; decode and forward relays; harvesting time; arrival time period; ergodic capacity; PB; perfect CSI; steady-state condition; regular periodic pattern; interference constraint; OP; closed form expression; energy harvesting multihop cognitive radio network; time splitting-based relaying scheme; maximum transmit power; secondary transmitting nodes; cognitive environment; transient-state condition; primary behaviour; radiofrequency signal; secondary source; primary beacon; multihop transmission scheme; harvesting efficiency

Subjects: Electromagnetic compatibility and interference; Radio links and equipment; Other topics in statistics; Energy harvesting

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