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Min-SINR-Maximizing Wireless-Powered AF Relay for Multisource and Multidestination Networks

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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 amplify-and-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.

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Notes

  1. ‘Compute-and-forward network coding with lattices’ protocol in [9] can be broadly classified into DF relay protocols since lattice-mapping is necessary at the relay node.

  2. Owing to the zero-forcing nature of the relay beamforming matrix, rank(\({\varvec{\Lambda }}\)) \(=K\) is sufficient for adjusting the SINR of each link. Thus, when \(N_r> K\), \(\lambda _{i}=0\) (\(i\ge N_r-K+1\)).

  3. Strictly speaking, this is the signal-to-noise ratio (SNR), because inter-user interferences are cancelled out by the ZF beamformer.

  4. Without EH, 15 (dB) generally represents an intermediate level of SNR (within the context of signal detection); with EH, it represents a low SNR level, resulting from power splitting to harvest energy.

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Authors and Affiliations

  1. Division of Navigation Science, Korea Maritime and Ocean University (KMOU), 727 Taejong-ro, Yeongdo-gu, Busan, 606-791, South Korea

    Joonwoo Shin

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  1. Joonwoo Shin
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Shin, J. Min-SINR-Maximizing Wireless-Powered AF Relay for Multisource and Multidestination Networks. Wireless Pers Commun 116, 1785–1793 (2021). https://doi.org/10.1007/s11277-020-07761-w

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  • DOI: https://doi.org/10.1007/s11277-020-07761-w

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