On spectrally-efficient device-to-device communication with wireless information and power transfer
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On spectrally-efficient device-to-device communication with wireless information and power transfer Sutanu Ghosh1 Accepted: 23 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, the model of cooperative cognitive radio network is used to explore the two-way communications between a pair of unlicensed users by sharing the spectrum of any existing pair of licensed users. The licensed users of the spectrum are considered as primary users (PUs) and the unlicensed users of the spectrum are considered as secondary users (SUs). SUs are able to access the PUs spectrum by serving the relaying action between PU-to-PU communications. SUs are enabled by harvesting the energy from radio frequency signal following the principle of power splitting (PS) scheme of simultaneous wireless information and power transfer protocol. The closed form outage expressions of both PU and SU systems are derived. Analytical results validated through the simulations results. The results are also compared with existing work on two-way SU communications in presence of two-way PU communications. Based on the comparison, it is found that about ∼ 191% and ∼ 656% performance gains are possible to achieve by using proposed PS protocol in terms of spectrum efficiency and energy efficiency, respectively as compared to similar system using time switching protocol. Keywords Cooperative cognitive radio network · Power splitting protocol · Two-way relaying · Spectrum-sharing · Energy efficiency
1 Introduction Recently, device-to-device (D2D) communication in the internet of things (IoT) [1–4] is explored as fast growing and promising technique for smart city applications. The devices involved in IoT communications use the unlicensed spectrum to fulfil their requirements. However, the huge usage of industrial, scientific and medical (ISM) band makes congestion in unlicensed band. Therefore, the spectrum sharing technique over licensed band is the most useful alternate for future IoT communications and the useful framework of disaster management in 5G [5,6]. In this work, the most demanding issue of bidirectional (D2D) communication is studied using spectrum sharing technique to support the existing IoT communications in smart city applications [7,8]. To enable spectrum sharing in D2D communication this work reviews the model of cooperative cognitive networks
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Sutanu Ghosh [email protected]; [email protected] Department of Electronics and Communication Engineering, Institute of Engineering and Management, Salt Lake, West Bengal, India
(CCRNs) [9], where an unlicensed user (also known as secondary user) plays the role of cooperative relay to support the communication between the licensed (spectrum) users (also known as primary users). In return, the secondary user (SU) avails the licensed spectrum of the primary user (PU). Two or, more proximity SU nodes can communicate directly over the PU spectrum to reduce the end-to-end latency by following the strategies of interweave, underlay and
