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Optimization of beamforming and path planning for UAV-assisted wireless relay networks

Chinese Journal of Aeronautics 2014年第2期27卷 313-320页

作者： Ouyang Jian Zhuang Yi Lin Min Liu Jia College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics PLA University of Science and Technology National Mobile Communications Research Laboratory Southeast University Computer Center Nanjing University of Aeronautics and Astronautics

Recently, unmanned aerial vehicles （UAVs） acting as relay platforms have attracted considerable attention due to the advantages of extending coverage and improving connectivity for long-range communications. Specifically, in the scenario where the access point （AP） is mobile, a UAV needs to find an efficient path to guarantee the connectivity of the relay link. Motivated by this fact, this paper proposes an optimal design for beamforming （BF） and UAV path planning. First of all, we study a dual-hop amplify-and-forward （AF） wireless relay network, in which a UAV is used as relay between a mobile AP and a fixed base station （BS）. In the network, both of the AP and the BS are equipped with multiple antennas, whereas the UAV has a single antenna. Then, we obtain the output signal^to-noise ratio （SNR） of the dual-hop relay network. Based on the criterion of maximizing the output SNR, we develop an optimal design to obtain the solution of the optimal BF weight vector and the UAV heading angle. Next, we derive the closed-form outage probability （OP） expression to investigate the performance of the dual-hop relay network conveniently. Finally, computer simulations show that the proposed approach can obtain nearly optimal flying path and OP performance, indicating the effectiveness of the proposed algorithm. Furthermore, we find that increasing the antenna number at the BS or the maximal heading angle can significantly improve the performance of the considered relay network.

关键词： Aircraft communication Beam forming Path planning Unmanned aerial vehicles wireless relay networks

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Resource allocation using time division multiple access over wireless relay networks

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The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 69-74页

作者： DAI Qin-yun RONG Lu HU Hong-lin SU Gang Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200052 China The Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan 430074 China

This article considers a wireless network consisting of multiple sources that communicate with the corresponding destination utilizing a single half-duplex relay, whereas, the sources use the relay opportunistically. By integrating the information theory with the concept of effective capacity, this article proposes a dynamic time allocation strategy over the wireless relay network that aims at maximizing the relay network throughput, subject to a given delay quality of service （QoS） constraint, where time division multiple access （TDMA） is applied in the relay network. The simulation results show that the proposed allocation strategy can significantly improve the effective capacity as compared to the traditional equal time allocation strategy.

关键词： resource allocation wireless relay networks effective capacity opportunistic transmission cooperative diversity

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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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