New Look on Device to Device NOMA Systems: with and Without Wireless Power Transfer Modes
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New Look on Device to Device NOMA Systems: with and Without Wireless Power Transfer Modes Dinh‑Thuan Do1 · Minh‑Sang Van Nguyen2
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, device to device (D2D) network is studied to support transmission in close distance among group of two users. Such two users benefit from new technique of multiple access, namely non-orthogonal multiple access. Two modes of D2D are considered, such as direct and relay links. Energy harvesting and design of multiple antennas have main impacts on system performance. We derive the closed-form expressions of outage probability for two devices in many scenarios. The Decode and Forward relaying scheme is adopted in this study. To ensure the quality of service (QoS) for the devices, suitable mode can be decided based on specific demand. We compare system performance by varying main parameters such as power allocation factors or transmit signal to noise ratio. Numerical results are performed to verify the effectiveness of the proposed D2D transmission strategies. Keywords Energy harvesting · Non-orthogonal multiple access · D2D networks · Throughput
1 Introduction The scarcity of wireless radio spectrum and the consumption of energy are known as main reason of degraded performance of wireless equipment in wireless networks. To enhance the spectral efficiency, besides cognitive radio, using non-othorgonal signal allows more users being served in same time [1, 2]. In addition, the life of the wireless communication system is restricted in some degree due to the limited battery capacity. The conventional renewable energy sources result in unreliable Communication since they meet many impacts including solar energy and wind energy. As an effective method * Dinh‑Thuan Do [email protected] Minh‑Sang Van Nguyen [email protected] 1
Department of Computer Science and Information Engineering, College of Information and Electrical Engineering, Asia University, Taichung City, Taiwan
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Faculty of Electronics Technology, Industrial University of Ho Chi Minh City (IUH), No. 12, Nguyen Van Bao Street, Go Vap District, Ho Chi Minh City, Vietnam
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D.-T. Do, M.-S. Van Nguyen
to reduce the consumption of energy in wireless equipment, harvesting energy from the radio frequency (RF) signals beenfits to wireless devices [3, 4]. In past decade, simutaneous wireless information and power transfer (SWIPT) technology was introduced in wide range of application in wireless networks. SWIPT-assisted networks are developed to improve both energy efficiency and reliable transmission [5–7]. However, impact of limited amount of harvested energy was raised in application of SWIPT [7]. Intuitively, much energy can be harvested by implementing multi antennas techniques [8]. Unfortunately, many IoT devices featuring the small size and cost limitations lead to design of multiple antennas indefeasibly Contrarily, two effective schemes are introduced to solve this challenge, such as wireless
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