Performance analysis of a cognitive radio network with adaptive RF energy harvesting

Abstract

ABSTRACT In this paper, we proposed an adaptive energy harvesting scheme and evaluated the performance of a dual hop cognitive radio network (CRN) under the proposed scheme. We considered a simultaneous wireless information and power transfer (SWIPT) protocol-based transmission of data from a secondary source (SS) to a secondary destination (SD) via a decode and forward (DF) relay. A time switching relay (TSR)-based energy harvesting is used to supply power to the DF relay. The secondary relay (SR) extracts energy from RF signal of SS to derive the transmit power at SR to a level of maximum allowable transmit power satisfying an interference constraint at the primary receiver (PR). To achieve a transmit power to a level of maximum allowable transmit power, the harvesting time duration or time fraction is dynamically adapted for each data frame. Outage probability with proposed adaptive harvesting scheme is derived analytically. A comparative study of the outage and throughput of our proposed adaptive harvesting scheme with a conventional fixed time based harvesting is presented. Finally, the proposed adaptive harvesting scheme is shown to outperform a fixed time-based harvesting scheme.