Min-SINR-Maximizing Wireless-Powered AF Relay for Multisource and Multidestination Networks
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Min‑SINR‑Maximizing Wireless‑Powered AF Relay for Multisource and Multidestination Networks Joonwoo Shin1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This study considers a wireless-powered relay assisting multisource multidestination (MSMD) communication networks. Specifically, a beamforming and power-allocation scheme for the relay node is proposed, where a multiple-input multiple-output amplifyand-forward relay node that operates with harvested energy mediates the communication between MSMD pairs. The joint optimization of the relay beamforming matrix and of the power-splitting ratio design for the purpose of maximizing the minimum signal-to-interference-plus-noise ratios (SINRs) is challenging owing to its nonconvexity. We therefore propose an efficient algorithm for finding the optimal solution. In addition, to reduce computational complexity, a zero-forcing beamforming-based suboptimal relay design method is also presented. Simulation results show the effectiveness of the proposed schemes in terms of both SINR and sum-rate performances. Keywords Wireless power transfer · Amplify-and-forward relay · Multisource multidestination
1 Introduction Wireless-powered relay networks (WPRNs) are cooperative communication systems based on energy-harvesting (EH) relaying schemes, which, together with EH techniques, have shown promise for extending the lifetimes of energy-constrained wireless networks [1]. WPRN relays exploit simultaneous wireless information- and power-transfer (SWIPT) technologies, so that relay nodes rely on harvesting the RF energy transferred from the source node to forward information [2–4]. Specifically, the authors [2] have developed a time-switching (TS) protocol and a power-splitting (PS) protocol for use in nonregenerative relay systems. Transceivers for TS relaying schemes [3] and PS relaying schemes [4] have also been investigated with the aim of maximizing achievable transfer rates. Nevertheless, wireless power in TS relaying is harvested in a dedicated time slot, which makes TS relaying consume more time slots than PS relaying. A PS relay strategy that would * Joonwoo Shin [email protected] 1
Division of Navigation Science, Korea Maritime and Ocean University (KMOU), 727 Taejong‑ro, Yeongdo‑gu, Busan 606‑791, South Korea
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harvest energy with fewer time slots would therefore be appealing [2]. On the other hand, multisource and multidestination (MSMD) integrated and cooperative transmission strategies, involving relay networks have also been studied [5, 6]. Generally, MSMD relaying schemes achieve higher data-transfer rates for each source-destination pair than a singlesource single-destination scheme via a relay system, because fewer time slots are required for data transfer. Thus, the authors in [7–9] adopted an EH relay to communicate between MSMD pairs. In specific, the power-allocation strategies to improve the outage performances [7], power-splitting ratio (PSR) optimization to achieve the rates [8], and MIMO re
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