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Symmetry
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Symmetry/Asymmetry in Wireless Communication and Sensor Networks II
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Symmetry/Asymmetry in Wireless Communication and Sensor Networks II

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Computer".

Deadline for manuscript submissions: 30 June 2025 | Viewed by 3340

Special Issue Editor

Dr. Haitao Xu

E-Mail Website
Guest Editor
Department of Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China
Interests: wireless resource allocation and management; wireless communications and networking; dynamic game and mean field game theory; big data analysis; security
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

During the past decade, human beings have entered an era of information explosion, and the popularization of traffic-intensive applications of all types of communication terminals has led to an unprecedented increase in the demand for information and communication. Both wired and wireless communications play a fundamental role in the information age. With the rapid increase in the wireless communication demand, the development of wireless communication systems has encountered bottlenecks. Continuous progress in the commercialization of 5G and the development and application of the Internet of Things, the Internet of Vehicles, wireless body area networks, and wireless sensor networks have put forward new requirements for wireless networks. In addition to the larger bandwidth and lower delay, wireless networks are also required to have a certain degree of intelligence, more efficient resource allocation algorithms, more reasonable network access methods, and more secure information safeguard measures.

Symmetry is an extraordinary characteristic which has been widely deployed in the research fields of wireless communication. This Special Issue invites original research that investigates the symmetry/asymmetry characteristics in wireless communication. We hope to spread knowledge among researchers, designers, manufacturers, and users in this exciting field with this Special Issue.

Potential topics include, but are not limited to, the following:

  • Symmetry/asymmetry protocol design in wireless communication and sensor networks;
  • Symmetry/asymmetry communication frameworks in wireless communication and sensor networks;
  • Symmetry/asymmetry transmission in satellite communication;
  • Symmetry/asymmetry data communication in wireless sensor networks/Internet of Things/Internet of Vehicles;
  • Symmetry/asymmetry privacy and security challenges in wireless communication and sensor networks;
  • Symmetry/asymmetry resource allocation schemes in wireless communication and sensor networks;
  • Symmetry/asymmetry in intelligent wireless communication and intelligent Internet of Things/Internet of Vehicles.

Dr. Haitao Xu
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
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  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue polices can be found here.

Published Papers (2 papers)

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22 pages, 4907 KiB  
Article
Symmetric Collaborative Fault-Tolerant Control of Multi-Intelligence under Long-Range Transmission in Air–Ground Integrated Wireless High-Mobility Self-Organizing Networks
by Zhifang Wang, Mingzhe Shao, Wenke Xu, Xuewei Huang, Yang Bai, Quanzhen Huang and Jianguo Yu
Symmetry 2024, 16(5), 582; https://doi.org/10.3390/sym16050582 - 8 May 2024
Viewed by 1059
Abstract
With the continuous development and progress of wireless self-organizing network communication technology, how to carry out long-distance cooperative control of multiple intelligences under the framework of an air–ground integrated wireless high-mobility self-organizing network has become a hot and difficult topic that needs to [...] Read more.
With the continuous development and progress of wireless self-organizing network communication technology, how to carry out long-distance cooperative control of multiple intelligences under the framework of an air–ground integrated wireless high-mobility self-organizing network has become a hot and difficult topic that needs to be solved urgently. This paper takes the air–ground integrated wireless high-mobility self-organizing network system as the basic framework and focuses on solving the long-distance cooperative fault-tolerant control of multi-intelligent bodies and the topological stability of a wireless mobile self-organizing network. To solve the above problems, a direct neural network with a robust adaptive fault-tolerant controller is designed in this paper. By constructing a symmetric population neural network model and combining it with the Lyapunov stabilization criterion, the system feedback matrix K has the ability of autonomous adaptive learning, and symmetrically distorts, rotates, or scales the training data to instantly adjust the system’s fault-tolerant corrections and adaptive adjusting factors to resist the unknown disturbances and faults, to achieve the goals of multi-intelligent body stable control and the stable operation of a wireless high-mobility self-organizing network topology. Simulation results show that with the feedback adjustment of the multi-system under the designed controller, the multi-system as a whole has good fault-tolerant performance and autonomous learning approximation performance, and the tracking error asymptotically converges to zero. The experimental results show that the multi-flight subsystems fly stably, the air–ground integrated wireless high-mobility self-organizing network topology has good stability performance, and the maximum relative improvement of the topology stability performance is 50%. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Wireless Communication and Sensor Networks II)
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18 pages, 3061 KiB  
Article
A Compact Microwave Quadrature Hybrid Coupler Using Capacitive Composite Lines and Meandered Stubs
by Sobhan Roshani, Salah I. Yahya, Maher Assaad, Muhammad Akmal Chaudhary, Fawwaz Hazzazi, Yazeed Yasin Ghadi, Sarmad M. Ali and Saeed Roshani
Symmetry 2023, 15(12), 2149; https://doi.org/10.3390/sym15122149 - 3 Dec 2023
Viewed by 1815
Abstract
In this paper, a new structure of the quadrature hybrid coupler (QHC) with compact size is proposed using capacitive composite lines and meandered open stubs. The proposed coupler works at 1.6 GHz with a 0.4 GHz bandwidth, which shows 25% fractional bandwidth (FBW). [...] Read more.
In this paper, a new structure of the quadrature hybrid coupler (QHC) with compact size is proposed using capacitive composite lines and meandered open stubs. The proposed coupler works at 1.6 GHz with a 0.4 GHz bandwidth, which shows 25% fractional bandwidth (FBW). The proposed QHC occupies only 15 mm × 15 mm (0.12 λ × 0.12 λ), while the typical QHC size is 32 mm × 32 mm (0.25 λ × 25 λ) at the same working frequency. In the designed structure, two symmetric meandered stubs and two symmetric π-shaped composite networks including capacitors and microstrip lines are applied together. The designed QHC has a small size and occupies only 22% of the area of the conventional QHC, resulting in a 78% size reduction. The designed prototype has been analyzed, fabricated and tested, and the experimental results verify the simulated and analysis results. The results show a better than 27 dB return loss, more than 28 dB isolation between the output ports and less than 0.4 dB insertion loss at the working frequency of 1600 MHz. With the achieved desirable specifications, the fabricated QHC is a suitable choice for wireless microwave applications. Full article
(This article belongs to the Special Issue Symmetry/Asymmetry in Wireless Communication and Sensor Networks II)
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