Exploiting cooperative relays to enhance the performance of energy-harvesting systems over Nakagami-m fading channels

Tuan Van Phu () and Hyung Yun Kong ()
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Tuan Van Phu: University of Ulsan
Hyung Yun Kong: University of Ulsan

Telecommunication Systems: Modelling, Analysis, Design and Management, 2018, vol. 69, issue 4, No 5, 477-487

Abstract: Abstract This paper investigates a time-switching energy-harvesting system in which a source communicates with a destination via energy-constrained amplify-and-forward relays. To exploit the benefit of using multiple relays, we propose a relay scheduling called consecutive relay selection (CRS), which allows all relays to assist the source-to-destination communication, to improve the transmission efficiency of the time-switching policy. The partial relay selection (PRS) is examined for performance comparison. The selected relay in the PRS protocol is considered in two cases: in one, it is selected based on the first-hop channel gains (PRS-1 protocol), and in the other, it is selected based on the second-hop channel gains (PRS-2 protocol). For performance evaluation, the analytical expressions of the outage probability and throughput for Nakagami-m fading channel are derived. Our results show that the CRS protocol outperforms the PRS protocol in terms of throughput, the PRS-1 protocol achieves better performance than the PRS-2 protocol. Moreover, we discuss the effects of various key system parameters on system performance, such as the energy-harvesting ratio, source transmission rate, and locations of relays, to provide insights into the various design choices.

Keywords: Wireless energy harvesting; Time switching; Cooperative communication; Relay selection; Amplify-and-forward; Nakagami-m fading (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (2)

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DOI: 10.1007/s11235-018-0448-y

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