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Two-Phase Bidirectional Dual-Relay Selection Strategy for Wireless Relay Networks

Computers, Materials & Continua 2021年第10期69卷 539-553页

作者： Samer Alabed Issam Maaz Mohammad Al-Rabayah College of Engineering and Technology American University of the Middle EastKuwait

In this article,we introduce a new bi-directional dual-relay selection strategy with its bit error rate(BER)performance *** the first step of the proposed strategy,two relays out of a set of N relay-nodes are selected in a way to optimize the system performance in terms of BER,based on the suggested algorithm which checks if the selected relays using the maxmin criterion are the best *** the second step,the chosen relay-nodes perform an orthogonal space-time coding scheme using the two-phase relaying protocol to establish a bi-directional communication between the communicating terminals,leading to a significant improvement in the achievable coding and diversity *** further improve the overall system performance,the selected relay-nodes apply also a digital network coding ***,this paper discusses the analytical approximation of the BER performance of the proposed strategy,where we prove that the analytical results match almost perfectly the simulated ***,our simulation results show that the proposed strategy outperforms the current state-of-the-art ones.

关键词： Two-way wireless relay networks cooperative diversity techniques distributed space-time coding relay selection strategies network coding schemes

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A Novel Beamforming Emulating Photonic Nanojets for Wireless Relay Networks

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Computers, Materials & Continua 2021年第10期69卷 575-588页

作者： Samer Alabed Ibrahim Mahariq Mohammad Salman Mustafa Kuzuoglu College of Engineering and Technology American University of the Middle EastKuwait Department of Electrical and Electronics Engineering Middle East Technical UniversityAnkara06800Turkey

In this article,a low-cost electromagnetic structure emulating photonic nanojets is utilized to improve the efficiency of wireless relay *** spectral element method,due to its high accuracy,is used to verify the efficiency of the proposed structure by solving the associate field *** application of optimal single-relay selection method shows that full diversity gain with low complexity can be *** this paper,the proposed technique using smart relays combines the aforementioned two methods to attain the benefits of both methods by achieving the highest coding and diversity gain and enhances the overall network performance in terms of bit error rate(BER).Moreover,we analytically prove the advantage of using the proposed *** our simulations,it can be shown that the proposed technique outperforms the best known state-of-the-art single relay selection ***,the BER expressions obtained from the theoretical analysis are perfectly matched to those obtained from the conducted simulations.

关键词： Wireless relay networks cooperative diversity techniques relay selection network beamforming techniques

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