Comparative throughput study of energy harvesting CR network with adaptive hybrid relay

In this paper, we have analyzed the throughput performance of spectrum sharing cognitive relay network incorporated with energy harvesting source and relay in presence of non-identical Rayleigh fading channel. In our model, multiple primary users are considered and their interference signal is used by source and relays to harvest energy. The relays follow Adaptive Hybrid (AHR) Protocol to forward source signal to destination. We use time switching relaying scheme to harvest secondary source as well as secondary relay. Throughput performance of the network is compared considering (a) delay-sensitive and (b) delay-tolerant transmission modes. It is observed that AHR protocol outperforms AF and DF protocols in both transmission modes. The effect of increasing the primary network operating power on system throughput is shown as a function of α\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\alpha$$\end{document}. The impact of number of relays and number of primary users on secondary throughput performance is also studied. A comparison for various combinations of number of relays and number of primary users is also shown.