期刊
IEEE ACCESS
卷 6, 期 -, 页码 4135-4144出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2018.2791581
关键词
Cognitive radio networks; RF-based energy harvesting; decode-and-forward; outage probability; diversity order; coding gain; Nakagami-m fading
资金
- Electronic Warfare Research Center, Gwangju Institute of Science and Technolog - Defense Acquisition Program Administration and Agency for Defense Development
In this paper, we consider an overlay cognitive radio network, in which a secondary transmitter (ST) is willing to relay the information of a primary transmitter toward a primary receiver. In return, ST can access the licensed band to send its own information superimposed with the primary signal to a secondary receiver. The power-limited ST uses a power splitting protocol to harvest energy from its received signal to increase its transmit power. We analyze the performance of the primary and the secondary systems under independent Nakagami-m fading by deriving their corresponding outage probabilities in integral-based expressions. In addition, by considering the high signal-to-noise ratio, we obtain very tight closed-form approximations of the outage probabilities. Thereafter, by further analyzing the approximations, we reveal novel insights on the diversity orders and coding gains of the two systems. Our analytical results are validated through extensive Monte-Carlo simulations.
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