Subjects -> COMMUNICATIONS (Total: 518 journals)
    - COMMUNICATIONS (446 journals)
    - DIGITAL AND WIRELESS COMMUNICATION (31 journals)
    - HUMAN COMMUNICATION (19 journals)
    - MEETINGS AND CONGRESSES (7 journals)
    - RADIO, TELEVISION AND CABLE (15 journals)

COMMUNICATIONS (446 journals)                  1 2 3 | Last

Showing 1 - 200 of 480 Journals sorted alphabetically
3C TIC     Open Access   (Followers: 1)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
Acta Universitatis Danubius. Communicatio     Open Access  
Acta Universitatis Sapientiae Communicatio     Open Access  
Advances in Image and Video Processing     Open Access   (Followers: 20)
Advances in Journalism and Communication     Open Access   (Followers: 26)
African Journal of Information and Communication     Open Access   (Followers: 6)
African Journal of Information Systems     Open Access   (Followers: 6)
African Journal of Rhetoric     Full-text available via subscription   (Followers: 3)
African Yearbook of Rhetoric     Full-text available via subscription   (Followers: 3)
Ambitos     Open Access   (Followers: 1)
American Journal of Semiotics     Full-text available via subscription   (Followers: 4)
Anagrama     Open Access  
Anagramas : Rumbos y Sentidos de la Comunicación     Open Access   (Followers: 2)
Anàlisi : Quaderns de Comunicació i Cultura     Open Access  
Âncora : Revista Latino-Americana de Jornalismo     Open Access  
Andharupa : Journal of Visual Communication Design & Multimedia     Open Access   (Followers: 3)
Annales Universitatis Paedagogicae Cracoviensis / Studia de Cultura     Open Access  
Annals of Telecommunications     Hybrid Journal   (Followers: 6)
Annals of the International Communication Association     Hybrid Journal   (Followers: 4)
Anuario electrónico de estudios en Comunicación Social "Disertaciones"     Open Access   (Followers: 1)
Apparatus. Film, Media and Digital Cultures of Central and Eastern Europe     Open Access   (Followers: 5)
Área Abierta     Open Access   (Followers: 2)
Art Design & Communication in Higher Education     Hybrid Journal   (Followers: 22)
At-Tabsyir : Jurnal Komunikasi Penyiaran Islam     Open Access  
Atatürk İletişim Dergisi     Open Access  
Aturá : Revista Pan-Amazônica de Comunicação     Open Access  
Auditory Perception & Cognition     Hybrid Journal  
Augmentative and Alternative Communication     Hybrid Journal   (Followers: 46)
Avatares de la Comunicación y la Cultura     Open Access  
Baltic International Yearbook of Cognition, Logic and Communication     Open Access   (Followers: 2)
Baltic Screen Media Review     Open Access   (Followers: 1)
Bioelectromagnetics     Hybrid Journal   (Followers: 1)
Black Camera     Full-text available via subscription   (Followers: 8)
Borderlands Journal : Culture, Politics, Law and Earth     Open Access   (Followers: 1)
C&SC - Communication & Social Change     Open Access   (Followers: 7)
Caderno de Letras     Open Access  
Canadian Journal of Communication     Partially Free   (Followers: 24)
Catalan Journal of Communication & Cultural Studies     Hybrid Journal   (Followers: 2)
Celebrity Studies     Hybrid Journal   (Followers: 13)
Chasqui. Revista Latinoamericana de Comunicación     Open Access   (Followers: 1)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Communication     Hybrid Journal   (Followers: 12)
Church, Communication and Culture     Open Access   (Followers: 1)
CIC. Cuadernos de Informacion y Comunicacion     Open Access   (Followers: 4)
Comedy Studies     Hybrid Journal   (Followers: 10)
Commons. Revista de Comunicación y Ciudadanía Digital     Open Access  
Communicatio : South African Journal for Communication Theory and Research     Hybrid Journal   (Followers: 3)
Communication     Open Access   (Followers: 28)
Communication & Language at Work     Open Access   (Followers: 10)
Communication & Society     Open Access   (Followers: 6)
Communication & Sport     Hybrid Journal   (Followers: 7)
communication +1     Open Access   (Followers: 2)
Communication and Culture Online / Komunikacija i kultura     Open Access   (Followers: 1)
Communication and Media in Asia Pacific (CMAP)     Open Access   (Followers: 2)
Communication and the Public     Hybrid Journal   (Followers: 2)
Communication Booknotes Quarterly     Hybrid Journal   (Followers: 15)
Communication Cultures in Africa     Open Access   (Followers: 7)
Communication et organisation     Open Access  
Communication et Professionnalisation     Open Access  
Communication Papers : Media Literacy & Gender Studies     Open Access   (Followers: 20)
Communication Research and Practice     Hybrid Journal  
Communication Theory     Hybrid Journal   (Followers: 29)
Communication, Culture & Critique     Hybrid Journal   (Followers: 28)
Communication, technologies et développement     Open Access  
Communications in Mobile Computing     Open Access   (Followers: 14)
Communications of the Association for Information Systems     Open Access   (Followers: 15)
Communiquer : Revue de communication sociale et publique     Open Access  
Computational Communication Research     Open Access   (Followers: 1)
Comuni@cción     Open Access  
Comunicação & Educação     Open Access  
Comunicação & Sociedade     Open Access   (Followers: 1)
Comunicação e Sociedade     Open Access  
Comunicació. Revista de recerca i d'anàlisi     Open Access  
Comunicación     Open Access  
Comunicación y Ciudadanía     Open Access  
Comunicación y Género     Open Access  
Comunicación y Medios     Open Access   (Followers: 2)
Comunicación y sociedad     Open Access   (Followers: 2)
Comunicar     Open Access   (Followers: 1)
Conexión     Open Access  
Connections     Open Access  
Connections : A Journal of Language, Media and Culture     Open Access   (Followers: 3)
Contratexto     Open Access  
Convergence The International Journal of Research into New Media Technologies     Hybrid Journal   (Followers: 48)
Creative Artist : A Journal of Theatre and Media Studies     Open Access   (Followers: 11)
Cross-cultural Communication     Open Access   (Followers: 8)
Cryptography     Open Access   (Followers: 1)
Cuadernos de H Ideas     Open Access  
Cuadernos de Informacion     Open Access  
Cuadernos.info     Open Access  
De Signos y Sentidos     Open Access  
Democratic Communiqué     Open Access   (Followers: 1)
Design Ecologies     Hybrid Journal   (Followers: 13)
Digithum     Open Access   (Followers: 2)
Discourse, Context & Media     Open Access   (Followers: 23)
Distúrbios da Comunicação     Open Access  
Dixit     Open Access  
Documentación de las Ciencias de la Información     Open Access  
Doxa Comunicación : Revista interdisciplinar de estudios de Comunicación y Ciencias Sociales     Open Access  
e-Journal of Linguistics     Open Access   (Followers: 3)
e-learning and education (eleed)     Open Access   (Followers: 39)
Electronic Journal of Knowledge Management     Open Access   (Followers: 25)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 8)
Empedocles : European Journal for the Philosophy of Communication     Hybrid Journal   (Followers: 2)
Entreculturas : Revista de Traducción y Comunicación Intercultural     Open Access  
ESSACHESS : Journal for Communication Studies     Open Access   (Followers: 2)
Etudes de communication     Open Access   (Followers: 3)
Evidence Based Library and Information Practice     Open Access   (Followers: 386)
Explorations in Media Ecology     Hybrid Journal   (Followers: 5)
Fibreculture Journal     Open Access   (Followers: 9)
FLEKS : Scandinavian Journal of Intercultural Theory and Practice     Open Access   (Followers: 1)
Folia Toruniensia     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Framework : The Journal of Cinema and Media     Full-text available via subscription   (Followers: 19)
Fronteiras - estudos midiáticos     Open Access  
Frontiers in Communication     Open Access   (Followers: 1)
Frontiers in Human Dynamics     Open Access  
Genre en séries. Cinéma, télévision, médias     Open Access  
Gesture     Hybrid Journal   (Followers: 4)
Global Advances in Business Communication     Open Access   (Followers: 5)
Global Media and China     Open Access  
Global Media and Communication     Hybrid Journal   (Followers: 17)
Global Media Journal     Open Access   (Followers: 11)
Globe : A Journal of Language, Culture and Communication     Open Access   (Followers: 3)
Green Letters : Studies in Ecocriticism     Hybrid Journal   (Followers: 1)
GSI Journals Serie C : Advancements in Information Sciences and Technologies     Open Access   (Followers: 1)
GSTF Journal on Media & Communications     Open Access   (Followers: 2)
H-ermes. Journal of Communication     Open Access   (Followers: 3)
Health Information Management Journal     Hybrid Journal   (Followers: 23)
HERMES - Journal of Language and Communication in Business     Open Access   (Followers: 3)
Hipertext.net : Anuario Académico sobre Documentación Digital y Comunicación Interactiva     Open Access  
Historia y Comunicación Social     Open Access  
Human Communication Research     Hybrid Journal   (Followers: 17)
Ibérica     Open Access   (Followers: 2)
Ícone     Open Access  
ICSES Transactions on Computer Networks and Communications     Full-text available via subscription  
IEEE Communications Standards Magazine     Full-text available via subscription   (Followers: 2)
IEEE Open Journal of the Communications Society     Open Access  
IEEE Transactions on Cognitive Communications and Networking     Hybrid Journal   (Followers: 4)
IEEE Transactions on Smart Grid     Hybrid Journal   (Followers: 18)
IEICE - Transactions on Fundamentals of Electronics, Communications and Computer Sciences     Full-text available via subscription   (Followers: 9)
IET Communications     Open Access   (Followers: 11)
İletişim Kuram ve Araştırma Dergisi     Open Access  
Imaging Decisions MRI     Hybrid Journal   (Followers: 2)
Improntas     Open Access  
index.comunicación     Open Access  
Informacijos mokslai     Open Access  
Informal Logic     Open Access   (Followers: 9)
Informatics     Open Access   (Followers: 3)
Informatio. Revista del Instituto de Información de la Facultad de Información y Comunicación     Open Access  
Information & Communications Technology Law     Hybrid Journal   (Followers: 22)
Information Design Journal     Hybrid Journal   (Followers: 7)
Information Technologies & International Development     Open Access   (Followers: 81)
Information, Communication & Society     Hybrid Journal   (Followers: 70)
Inquiry : Critical Thinking Across the Disciplines     Full-text available via subscription   (Followers: 2)
Intelligent Information Management     Open Access   (Followers: 7)
Interaction Studies     Hybrid Journal   (Followers: 9)
Interactions : Studies in Communication & Culture     Hybrid Journal   (Followers: 3)
International Journal of Ad Hoc and Ubiquitous Computing     Hybrid Journal   (Followers: 8)
International Journal of Advanced Media and Communication     Hybrid Journal   (Followers: 22)
International Journal of Autonomous and Adaptive Communications Systems     Hybrid Journal   (Followers: 3)
International Journal of Broadband Cellular Communication     Full-text available via subscription  
International Journal of Business Communication     Hybrid Journal   (Followers: 10)
International Journal of Communication     Open Access   (Followers: 15)
International Journal of Community Development and Management Studies (IJCDMS)     Open Access  
International Journal of Computer Science and Telecommunications     Open Access   (Followers: 13)
International Journal of Cooperative Information Systems     Hybrid Journal   (Followers: 4)
International Journal of Critical Media Literacy     Hybrid Journal  
International Journal of Electronics and Telecommunications     Open Access   (Followers: 8)
International Journal of Entertainment Technology and Management     Hybrid Journal   (Followers: 1)
International Journal of Information and Communication Technology Education     Full-text available via subscription   (Followers: 13)
International Journal of Information Communication Technologies and Human Development     Full-text available via subscription   (Followers: 4)
International Journal of Information Science and Technology     Open Access  
International Journal of Information Technology, Communications and Convergence     Hybrid Journal   (Followers: 14)
International Journal of Intelligence Science     Open Access   (Followers: 3)
International Journal of Interdisciplinary Telecommunications and Networking     Full-text available via subscription   (Followers: 3)
International Journal of Knowledge and Systems Science     Full-text available via subscription   (Followers: 1)
International Journal of Monitoring and Surveillance Technologies Research     Full-text available via subscription   (Followers: 3)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 2)
International Journal of Society, Culture & Language     Open Access   (Followers: 15)
International Journal of Telecommunications & Emerging Technologies     Full-text available via subscription   (Followers: 1)
International Journal of Telework and Telecommuting Technologies     Full-text available via subscription  
International Journal of Trust Management in Computing and Communications     Hybrid Journal   (Followers: 1)
International Journals Digital Communication and Analog Signals     Full-text available via subscription   (Followers: 6)
International Review of Communication and Marketing Mix : IROCAMM     Open Access   (Followers: 1)
International Review of Pragmatics     Hybrid Journal   (Followers: 4)
Investigative Radiology     Hybrid Journal   (Followers: 7)
IRIS - Revista de Informação, Memória e Tecnologia     Open Access  
Izvestia Ural Federal University Journal. Series 1. Issues in Education, Science and Culture     Open Access  
Javnost - The Public     Hybrid Journal  
Język. Komunikacja. Informacja     Open Access  
Journal for the History of Rhetoric     Hybrid Journal   (Followers: 16)
Journal of Advertising Education     Hybrid Journal  
Journal of African Media Studies     Hybrid Journal   (Followers: 2)
Journal of Applied Communications     Open Access  
Journal of Applied Journalism & Media Studies     Hybrid Journal   (Followers: 14)
Journal of Argumentation in Context     Hybrid Journal   (Followers: 2)
Journal of Arts & Communities     Hybrid Journal   (Followers: 4)

        1 2 3 | Last

Similar Journals
Journal Cover
China Communications
Journal Prestige (SJR): 0.314
Citation Impact (citeScore): 2
Number of Followers: 8  
 
  Full-text available via subscription Subscription journal
ISSN (Online) 1673-5447
Published by IEEE Homepage  [228 journals]
  • Editorial: Special issue on 2021 BOFWS

    • Free pre-print version: Loading...

      Abstract: The Blue Ocean Forum for Worldwide Scientists (BOFWS) has gone through a history of 5 years. It has gathered high-end experts, scholars and professors as well as elites from leading enterprises in the worldwide information and communications technologies (ICT) field,. The grand meeting gives full play to the "star effect" of industry experts, represents the highest academic level in the current global ICT field, and plays a far-reaching role in promoting the ICT development.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Back cover

    • Free pre-print version: Loading...

      Abstract: Presents the back cover for this issue of the publication.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Implementation framework and validation of cluster-nuclei based channel
           model using environmental mapping for 6G communication systems

    • Free pre-print version: Loading...

      Authors: Li Yu;Yuxiang Zhang;Jianhua Zhang;Zhiqiang Yuan;
      Pages: 1 - 13
      Abstract: With the research of the upcoming sixth generation (6G) systems, new technologies will require wider bandwidth, larger scale antenna arrays and more diverse wireless communication scenarios on the future channel modeling. Considering channel model is prerequisite for system design and performance evaluation of 6G technologies, we face a challenging task: how to accurately and efficiently model 6G channel for various scenarios' This paper tries to answer it. Firstly, the features of cluster-nuclei (CN) and principle of cluster-nuclei based channel model (CNCM) are introduced. Then, a novel modeling framework is proposed to implement CNCM, which consists four steps: propagation environment reconstruction, cluster-nuclei identification, multipath parameters generation, and channel coefficients generation. Three-dimensional environment with material information is utilized to map CN with scatterers in the propagation pathway. CN are identified by geometrical and electric field calculation based on environmental mapping, and multipath components within CN are calculated by statistical characteristics of angle, power and delay domains. Finally, we present a three-level verification structure to investigate the accuracy and complexity of channel modeling comprehensively. Simulation results reveal that CNCM can perform higher accuracy than geometry-based stochastic model while lower complexity compared with ray-tracing model for practical propagation environment.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Reliability-optimal pilot-assisted transmission for URLLC over
           non-reciprocal MISO channels: TDD or FDD'

    • Free pre-print version: Loading...

      Authors: Yuncong Xie;Pinyi Ren;
      Pages: 14 - 27
      Abstract: In this paper, we focus on the pilot-assisted transmission design for downlink URLLC over non-reciprocal channels, in which the multi-antenna controller sends mission-critical data signals to a single-antenna actuator. In this system, the prior knowledge of downlink channel state information (CSI) is a prerequisite for reliable data transmission. Generally, the acquisition of downlink CSI is completed either via the uplink pilot measurement exploiting channel reciprocity and time-division duplex (TDD) operation, or via the downlink pilot measurement with quantized feedback and frequency division duplex (FDD) operation. Inspired by this, we aim to investigate how the degree of channel non-reciprocity impacts the transmission reliability of our URLLC system, and the superiority between the TDD mode and FDD mode in terms of transmission reliability maximization. To describe the degree of reliability loss, we derive the closed-form approximations on the transmission error probability of URLLC in TDD and FDD modes, via leveraging the Gauss-Hermite and Gauss-Chebyshev quadrature rules. Following by the theoretical approximations, we demonstrate how to determine the optimal training pilot length and quantized feedback duration that maximize the transmission reliability under given latency constraint. Through numerical results, we validate the accuracy of theoretical approximations derived in this paper, and obtain some meaningful conclusions.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Measurements and characterization for the vehicle-to-infrastructure
           channel in urban and highway scenarios at 5.92GHz

    • Free pre-print version: Loading...

      Authors: Yuanyuan Fan;Yi Feng;Liu Liu;Shuoshuo Dong;Zhaoyang Su;Jiahui Qiu;Xiaobo Lin;
      Pages: 28 - 43
      Abstract: In the future smart transportation system, reliable vehicle-to-infrastructure (V2I) communication is very important to ensure vehicle driving safety and to improve vehicle driving efficiency. In this paper, V2I channel measurements at 5.92 GHz are conducted in typical urban and highway scenarios. The frequency and bandwidth of transmission, as well as the deployment of the RSU (roadside unit) and the OBU (on board unit), are selected by considering the recommendation proposed by 3GPP TR 36.885. Then, based on the measured data, the key channel characteristic parameters of the V2I channel are extracted, including path loss, root-mean-square delay spread, stationarity distance, and Doppler spread, etc. Also, the statistical characteristics of the parameters, including time-varying and Doppler characteristics, are investigated and characterized. The work in this paper helps researchers design technology and communication systems in similar scenarios.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • A MmWave communication testbed based on IEEE 802.11ad with scalable PtMP
           configuration

    • Free pre-print version: Loading...

      Authors: Chaowei Wang;Mingliang Pang;Dinghui Zhong;Yuling Cui;Weidong Wang;
      Pages: 44 - 56
      Abstract: The sub-6G band is too crowded to accommodate higher data rate, while the millimeter wave (mmWave) bands have abundant spectrum resources and massive MIMO can provide high spectral and energy efficiency. Therefore, the combination of the two, namely mmWave-MIMO system, has attracted intensive research interests. In this paper, we develop a high-speed mmWave-MIMO communication system and conduct exhaustive field tests. The detail of the system design is provided and the key modules of the testbed are analyzed. The testbed exploits high gain of mmWave RF and flexible configuration of embedded system. The validation and field tests show that the developed testbed can provide up to 2.3 Gbps network layer data rate in single channel with low latency and support point-to-multi-point (PtMP) transmission aided by relay. The testbed can be used in future B5G and 6G systems to provide high reliability and low latency wireless coverage.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Joint optimization scheme based on beam selection and interference
           cancellation in lens millimeter wave NOMA systems

    • Free pre-print version: Loading...

      Authors: Lei Xu;Jing Cai;Jing Chang;Hongyu Fang;Xiaohui Li;
      Pages: 57 - 66
      Abstract: Non-orthogonal multiple access (NOMA) has been integrated in millimeter-wave (mmWave) Massive MIMO systems to further enhance the spectrum efficiency, but NOMA has not been fully considered in lens mmWave systems. The fusion of these two technologies requires the joint design of beam selection and interference cancellation. In addition, when users follow the spatial cluster distribution, although the user clustering schemes based on K-means algorithm have been applied, the influence of the virtual and actual cluster center users on achievable sum rate has not been differentiated and analyzed in detail. To solve the above problems, a joint optimization scheme is proposed to maximize the achievable sum rate. The optimization problem is NP-hard, which is solved by using the divide-and-conquer approach. Concretely, based on the signal power loss analysis of directional deviation, a beam selection algorithm is designed for inter-cluster interference cancellation based on the K-means algorithm. Further for intra-cluster interference cancellation, a power allocation algorithm based on the bisection method is designed to guarantee the fairness of users in each cluster. The simulation results show that the proposed scheme offers a significant performance improvement in terms of both achievable sum rate and energy efficiency, and it is suitable for the large-scale user scenario due to its low complexity.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Joint Doppler shift and channel estimation for UAV mmWave system with
           massive ULA

    • Free pre-print version: Loading...

      Authors: Yanan Li;Yue Zhu;Tiankui Zhang;Dian Fan;
      Pages: 67 - 82
      Abstract: A joint Doppler shift and channel estimation method for the millimeter-wave communication system of an unmanned aerial vehicle (UAV) equipped with a large-scale uniform linear antenna (ULA) array has been proposed. Since Doppler shift induces intercarrier interference, the parameters of the channel paths have been decomposed into the Doppler shift and the channel information. In order to obtain the Doppler shift, a new estimation algorithm based on a combination of discrete Fourier transform and phase rotation has been proposed, which can determine the appropriate number of antennas. In addition to estimating the channel information, a low-complexity joint Doppler shift and channel estimation method has been designed that can quickly obtain accurate estimates. Furthermore, the achievable sum rate, the theoretical bounds of the mean squared errors, and the Cramér-Rao lower bounds of the estimation method have been derived. The analysis and simulation results prove that the performance of the proposed approach is close to the theoretical inference.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Joint pilot design and beamforming optimization in massive MIMO
           surveillance systems

    • Free pre-print version: Loading...

      Authors: Caihong Kai;Xiangru Zhang;Xinyue Hu;Wei Huang;
      Pages: 83 - 97
      Abstract: This paper proposes a novel joint channel estimation and beamforming scheme for the massive multiple-input-multiple-output (MIMO) frequency-division duplexing (FDD) wireless legitimate surveillance system. With the proposed scheme, the monitor with the full duplex capability realizes the proactive eavesdropping of the suspicious link by leveraging the pilot attack approach. Specifically, exploiting the effective eavesdropping rate and the mean square error as performance metrics and setting a total power budget at the training and transmission phases, while guaranteeing the information from suspicious source can be successfully decode, joint pilot design, power allocation and beamforming strategy are formulated as optimization problems for the two objective functions: MSE and effective eavesdropping rate. A closed-form expression of the optimal pilot with the limited length can be obtained via the channel correlation. The optimal power problem at the training phase can be solved by a simple bisection method. Then, based on the obtained imperfect estimated channel, the jamming beamforming at monitor optimization algorithm is proposed by utilizing the convex Semidefinite Programming approach to maximize the effective eavesdropping rate. Numerical results show that the proposed joint pilot design, power allocation and beamforming optimization scheme can improve the surveillance performance of the legitimate monitor as compared to the existing passive eavesdropping and jamming-assisted eavesdropping.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • A novel kind of wideband low-profile dielectric resonator antenna suitable
           for beam-scanning applications

    • Free pre-print version: Loading...

      Authors: Wenjian Sun;Yang Yu;Yingdong Hu;Wenwen Yang;Jianxin Chen;
      Pages: 98 - 107
      Abstract: In this paper, a low-profile wideband dielectric resonator antenna (DRA) with a very compact planar size is investigated. The antenna consists of a high permittivity dielectric sheet on the top, a low permittivity substrate in the middle, and a probe feeding structure at the bottom. By digging an annular slot in the designated area of the square dielectric sheet, the resonant frequency of fundamental TE111 mode can be effectively increased to be close to the high-order TE131 mode. The two modes can be finally merged together, yielding a wide impedance bandwidth of 16.6%. Most importantly, the combination of the two modes is done on the premise of a fixed antenna planar size, which can be very compact and suitable for beam-scanning applications. A probe feeding structure is used to excite the DRA, making the antenna simple and practical to be integrated with other RF circuits. For verification, antenna prototypes with single-feed linear polarization and differential-feed dual polarization were fabricated and measured. Reasonable agreement between the measured and simulated results is observed.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • IRS-aided SWIPT systems with power splitting and artificial noise

    • Free pre-print version: Loading...

      Authors: Baogang Li;Fuqiang Si;Dongsheng Han;Wujing Wu;
      Pages: 108 - 120
      Abstract: Intelligent reflecting surface (IRS) is regarded as a promising technology because it can achieve higher passive beamforming gain. In particular, the IRS assisted simultaneous wireless information and power transfer (SWIPT) system can make the information decoding receivers (IDRs) have a higher signal-to-noise ratio (SNR), and the energy harvesting receivers (EHRs) have the guarantee of minimum harvested energy threshold. Motivated by the above, in this paper, we use the power splitting (PS) at the user and introduce artificial noise (AN) into the access point (AP), so that the user in system can harvest energy and decode information simultaneously, further improve the security of user. We jointly optimize the beamforming matrix at AP, the reflection phase shift at IRS and the PS ratio, in order to maximize the user's achievable secrecy rate, subject to the user's minimum harvested energy threshold and AP's transmission power. Due to the introduction of PS ratio, the coupling between variables is increased, and the complexity of the problem is significantly increased. Furthermore, the problem is non-convex, so we propose an efficient algorithm based on Taylor Formula, semi-definite relaxation (SDR) and alternating optimization (AO) to get the solution. Numerical results show that the proposed IRS-SWIPT system with PS and AN achieves significant performance improvement compared with other benchmark scheme.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Delay-optimal random access in large-scale energy harvesting IoT networks
           based on mean field game

    • Free pre-print version: Loading...

      Authors: Dezhi Wang;Wei Wang;Zhaoyang Zhang;Aiping Huang;
      Pages: 121 - 136
      Abstract: With energy harvesting capability, the Internet of things (IoT) devices transmit data depending on their available energy, which leads to a more complicated coupling and brings new technical challenges to delay optimization. In this paper, we study the delay-optimal random access (RA) in large-scale energy harvesting IoT networks. We model a two-dimensional Markov decision process (MDP) to address the coupling between the data and energy queues, and adopt the mean field game (MFG) theory to reveal the coupling among the devices by utilizing the large-scale property. Specifically, to obtain the optimal access strategy for each device, we derive the Hamilton-Jacobi-Bellman (HJB) equation which requires the statistical information of other devices. Moreover, to model the evolution of the states distribution in the system, we derive the Fokker-Planck-Kolmogorov (FPK) equation based on the access strategy of devices. By solving the two coupled equations, we obtain the delay-optimal random access solution in an iterative manner with Lax-Friedrichs method. Finally, the simulation results show that the proposed scheme achieves significant performance gain compared with the conventional schemes.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Collaborative multiple access and energy-efficient resource allocation in
           distributed maritime wireless networks

    • Free pre-print version: Loading...

      Authors: Xueyan Cao;Hongming Zhang;Mugen Peng;
      Pages: 137 - 153
      Abstract: With the rapid increasing of maritime activities, maritime wireless networks (MWNs) with high reliability, high energy efficiency, and low delay are required. However, the centralized networking with fixed resource scheduling is not suitable for MWNs due to the special environment. In this paper, we introduce the collaborative relay communication in distributed MWNs to improve the link reliability, and propose an orthogonal time-frequency resource block reservation based multiple access (RRMA) scheme for both one-hop direct link and two-hop collaborative relay link to reduce the interference. To further improve the network performance, we formulate an energy efficiency (EE) maximization resource allocation problem and solve it by an iterative algorithm based on the Dinkelbach method. Finally, numerical results are provided to investigate the proposed RRMA scheme and resource allocation algorithm, showing that the low outage probability and transmission delay can be attained by the proposed RRMA scheme. Moreover, the proposed resource allocation algorithm is capable of achieving high EE in distributed MWNs.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Effective methods and performance analysis on data transmission security
           with blind source separation in space-based AIS

    • Free pre-print version: Loading...

      Authors: Chengjie Li;Lidong Zhu;Zhongqiang Luo;Zhen Zhang;Ying Yang;
      Pages: 154 - 165
      Abstract: In space-based Automatic Identification Systems (AIS), due to high satellite orbits, several Ad Hoc cells within the observation range of the satellite are vulnerable to interference by an external signal. To increase efficiency in target detection and improve system security, a blind source separation method is adopted for processing the conflicting signals received by satellites. Compared to traditional methods, we formulate the separation problem as a clustering problem. Since our algorithm is affected by the sparse-ness of source signals, to get satisfactory results, our algorithm assumes that the distance between two arbitrary mixed-signal vectors is less than the doubled sum of variances of distribution of the corresponding mixtures. Signal sparsity is overcome by computing the Short-Time Fourier Transform, and the mixed source signals are separated using the improved PSO clustering. We evaluated the performance and the robustness of the proposed network architecture by several simulations. The experimental results demonstrate the effectiveness of the proposed method in not only improving satellite signal receiving ability but also in enhancing space-based AIS security.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Multi-agent few-shot meta reinforcement learning for trajectory design and
           channel selection in UAV-assisted networks

    • Free pre-print version: Loading...

      Authors: Shiyang Zhou;Yufan Cheng;Xia Lei;Huanhuan Duan;
      Pages: 166 - 176
      Abstract: Unmanned aerial vehicle (UAV)-assisted communications have been considered as a solution of aerial networking in future wireless networks due to its low-cost, high-mobility, and swift features. This paper considers a UAV-assisted downlink transmission, where UAVs are deployed as aerial base stations to serve ground users. To maximize the average transmission rate among the ground users, this paper formulates a joint optimization problem of UAV trajectory design and channel selection, which is NP-hard and non-convex. To solve the problem, we propose a multi-agent deep Q-network (MADQN) scheme. Specifically, the agents that the UAVs act as perform actions from their observations distributively and share the same reward. To tackle the tasks where the experience is insufficient, we propose a multi-agent meta reinforcement learning algorithm to fast adapt to the new tasks. By pretraining the tasks with similar distribution, the learning model can acquire general knowledge. Simulation results have indicated the MADQN scheme can achieve higher throughput than fixed allocation. Furthermore, our proposed multiagent meta reinforcement learning algorithm learns the new tasks much faster compared with the MADQN scheme.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Multi-receiver signcryption scheme with multiple key generation centers
           through public channel in edge computing

    • Free pre-print version: Loading...

      Authors: Lipeng Wang;Zhi Guan;Zhong Chen;Mingsheng Hu;
      Pages: 177 - 198
      Abstract: The emerging edge computing technology for the Internet of Things has been playing an important role in our daily life. It is promising to utilize a multi-receiver signcryption scheme to protect the transmission data when an edge device broadcasts its sensing data to many different end devices at a time. There are several things to consider when we design a signcryption scheme. First existing schemes need to maintain a secure channel to generate the user private key, which may increase economic costs. Second the system private key of those schemes is kept secret by a single key generation center (KGC), and the single point of failure of KGC may compromise the whole system. For this, we propose a multi-receiver multi-message signcryption scheme without the secure channel. Firstly the scheme allows KGC to send secrets through the public channel, which reduces maintenance costs. Secondly, to eliminate the single point of failure, the scheme utilizes multiple KGCs to manage the system private key, and updates the secret of each KGC periodically to resist advanced persistent threat attacks. We demonstrate that the proposed scheme can achieve expected security properties. Performance analysis shows that it is with shorter ciphertext length and higher efficiency.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Time-critical tasks implementation in MEC based multi-robot cooperation
           systems

    • Free pre-print version: Loading...

      Authors: Rui Yin;Yineng Shen;Huawei Zhu;Xianfu Chen;Celimuge Wu;
      Pages: 199 - 215
      Abstract: Mobile edge computing (MEC) deployment in a multi-robot cooperation (MRC) system is an effective way to accomplish the tasks in terms of energy consumption and implementation latency. However, the computation and communication resources need to be considered jointly to fully exploit the advantages brought by the MEC technology. In this paper, the scenario where multi robots cooperate to accomplish the time-critical tasks is studied, where an intelligent master robot (MR) acts as an edge server to provide services to multiple slave robots (SRs) and the SRs are responsible for the environment sensing and data collection. To save energy and prolong the function time of the system, two schemes are proposed to optimize the computation and communication resources, respectively. In the first scheme, the energy consumption of SRs is minimized and balanced while guaranteeing that the tasks are accomplished under a time constraint. In the second scheme, not only the energy consumption, but also the remaining energies of the SRs are considered to enhance the robustness of the system. Through the analysis and numerical simulations, we demonstrate that even though the first policy may guarantee the minimization on the total SRs' energy consumption, the function time of MRC system by the second scheme is longer than that by the first one.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Delay minimization for intelligent reflecting surface assisted federated
           learning

    • Free pre-print version: Loading...

      Authors: Ning Huang;Tianshun Wang;Yuan Wu;Suzhi Bi;Liping Qian;Bin Lin;
      Pages: 216 - 229
      Abstract: Federated learning (FL), which allows multiple mobile devices to cooperatively train a machine learning model without sharing their data with the central server, has received widespread attention. However, the process of FL involves frequent communications between the server and mobile devices, which incurs a long latency. Intelligent reflecting surface (IRS) provides a promising technology to address this issue, thanks to its capacity to reconfigure the wireless propagation environment. In this paper, we exploit the advantage of IRS to reduce the latency of FL. Specifically, we formulate a latency minimization problem for the IRS assisted FL system, by optimizing the communication resource allocations including the devices' transmit-powers, the uploading time, the downloading time, the multi-user decomposition matrix and the phase shift matrix of IRS. To solve this non-convex problem, we propose an efficient algorithm which is based on the Block Coordinate Descent (BCD) and the penalty difference of convex (DC) algorithm to compute the solution. Numerical results are provided to validate the efficiency of our proposed algorithm and demonstrate the benefit of deploying IRS for reducing the latency of FL. In particular, the results show that our algorithm can outperform the baseline of Majorization-Minimization (MM) algorithm with the fixed transmit-power by up to 30%.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Distributed deep learning for cooperative computation offloading in low
           earth orbit satellite networks

    • Free pre-print version: Loading...

      Authors: Qingqing Tang;Zesong Fei;Bin Li;
      Pages: 230 - 243
      Abstract: Low earth orbit (LEO) satellite network is an important development trend for future mobile communication systems, which can truly realize the "ubiquitous connection" of the whole world. In this paper, we present a cooperative computation offloading in the LEO satellite network with a three-tier computation architecture by leveraging the vertical cooperation among ground users, LEO satellites, and the cloud server, and the horizontal cooperation between LEO satellites. To improve the quality of service for ground users, we optimize the computation offloading decisions to minimize the total execution delay for ground users subject to the limited battery capacity of ground users and the computation capability of each LEO satellite. However, the formulated problem is a large-scale nonlinear integer programming problem as the number of ground users and LEO satellites increases, which is difficult to solve with general optimization algorithms. To address this challenging problem, we propose a distributed deep learning-based cooperative computation offloading (DDLCCO) algorithm, where multiple parallel deep neural networks (DNNs) are adopted to learn the computation offloading strategy dynamically. Simulation results show that the proposed algorithm can achieve near-optimal performance with low computational complexity compared with other computation offloading strategies.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Intelligent task offloading and collaborative computation in
           multi-UAV-enabled mobile edge computing

    • Free pre-print version: Loading...

      Authors: Jingming Xia;Peng Wang;Bin Li;Zesong Fei;
      Pages: 244 - 256
      Abstract: This article establishes a three-tier mobile edge computing (MEC) network, which takes into account the cooperation between unmanned aerial vehicles (UAVs). In this MEC network, we aim to minimize the processing delay of tasks by jointly optimizing the deployment of UAVs and offloading decisions, while meeting the computing capacity constraint of UAVs. However, the resulting optimization problem is nonconvex, which cannot be solved by general optimization tools in an effective and efficient way. To this end, we propose a two-layer optimization algorithm to tackle the non-convexity of the problem by capitalizing on alternating optimization. In the upper level algorithm, we rely on differential evolution (DE) learning algorithm to solve the deployment of the UAVs. In the lower level algorithm, we exploit distributed deep neural network (DDNN) to generate offloading decisions. Numerical results demonstrate that the two-layer optimization algorithm can effectively obtain the near-optimal deployment of UAVs and offloading strategy with low complexity.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Online computation offloading and trajectory scheduling for UAV-enabled
           wireless powered mobile edge computing

    • Free pre-print version: Loading...

      Authors: Han Hu;Xiang Zhou;Qun Wang;Rose Qingyang Hu;
      Pages: 257 - 273
      Abstract: The unmanned aerial vehicle (UAV)-enabled mobile edge computing (MEC) architecture is expected to be a powerful technique to facilitate 5G and beyond ubiquitous wireless connectivity and diverse vertical applications and services, anytime and anywhere. Wireless power transfer (WPT) is another promising technology to prolong the operation time of low-power wireless devices in the era of Internet of Things (IoT). However, the integration of WPT and UAV-enabled MEC systems is far from being well studied, especially in dynamic environments. In order to tackle this issue, this paper aims to investigate the stochastic computation offloading and trajectory scheduling for the UAV-enabled wireless powered MEC system. A UAV offers both RF wireless power transmission and computation services for IoT devices. Considering the stochastic task arrivals and random channel conditions, a long-term average energy-efficiency (EE) minimization problem is formulated. Due to non-convexity and the time domain coupling of the variables in the formulated problem, a low-complexity online computation offloading and trajectory scheduling algorithm (OCOTSA) is proposed by exploiting Lyapunov optimization. Simulation results verify that there exists a balance between EE and the service delay, and demonstrate that the system EE performance obtained by the proposed scheme outperforms other benchmark schemes.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Joint optimization of latency and energy consumption for mobile edge
           computing based proximity detection in road networks

    • Free pre-print version: Loading...

      Authors: Tongyu Zhao;Yaqiong Liu;Guochu Shou;Xinwei Yao;
      Pages: 274 - 290
      Abstract: In recent years, artificial intelligence and automotive industry have developed rapidly, and autonomous driving has gradually become the focus of the industry. In road networks, the problem of proximity detection refers to detecting whether two moving objects are close to each other or not in real time. However, the battery life and computing capability of mobile devices are limited in the actual scene, which results in high latency and energy consumption. Therefore, it is a tough problem to determine the proximity relationship between mobile users with low latency and energy consumption. In this article, we aim at finding a tradeoff between latency and energy consumption. We formalize the computation offloading problem base on mobile edge computing (MEC) into a constrained multiobjective optimization problem (CMOP) and utilize NSGA-II to solve it. The simulation results demonstrate that NSGA-II can find the Pareto set, which reduces the latency and energy consumption effectively. In addition, a large number of solutions provided by the Pareto set give us more choices of the offloading decision according to the actual situation.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • An improved convolutional neural network based indoor localization by
           using Jenks natural breaks algorithm

    • Free pre-print version: Loading...

      Authors: Chengjie Hou;Yaqin Xie;Zhizhong Zhang;
      Pages: 291 - 301
      Abstract: With the rapid growth of the demand for indoor location-based services (LBS), Wi-Fi received signal strength (RSS) fingerprints database has attracted significant attention because it is easy to obtain. The fingerprints algorithm based on convolution neural network (CNN) is often used to improve indoor localization accuracy. However, the number of reference points used for position estimation has significant effects on the positioning accuracy. Meanwhile, it is always selected arbitraily without any guiding standards. As a result, a novel location estimation method based on Jenks natural breaks algorithm (JNBA), which can adaptively choose more reasonable reference points, is proposed in this paper. The output of CNN is processed by JNBA, which can select the number of reference points according to different environments. Then, the location is estimated by weighted K-nearest neighbors (WKNN). Experimental results show that the proposed method has higher positioning accuracy without sacrificing more time cost than the existing indoor localization methods based on CNN.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
  • Age of transmission-optimal scheduling for state update of multi-antenna
           cellular Internet of Things

    • Free pre-print version: Loading...

      Authors: Song Li;Min Li;Ruirui Chen;Yanjing Sun;
      Pages: 302 - 314
      Abstract: Timely information updates are critical for real-time monitoring and control applications in the Internet of Things (IoT). In this paper, we consider a multi-antenna cellular IoT for state update where a base station (BS) collects information from randomly distributed IoT nodes through time-varying channel. Specifically, multiple IoT nodes are allowed to transmit their state update simultaneously in a spatial multiplex manner. Inspired by age of information (AoI), we introduce a novel concept of age of transmission (AoT) for the sceneries in which BS cannot obtain the generation time of the packets waiting to be transmitted. The deadline-constrained AoT-optimal scheduling problem is formulated as a restless multi-armed bandit (RMAB) problem. Firstly, we prove the indexability of the scheduling problem and derive the closed-form of the Whittle index. Then, the interference graph and complementary graph are constructed to illustrate the interference between two nodes. The complete subgraphs are detected in the complementary graph to avoid inter-node interference. Next, an AoT-optimal scheduling strategy based on the Whittle index and complete subgraph detection is proposed. Finally, numerous simulations are conducted to verify the performance of the proposed strategy.
      PubDate: April 2022
      Issue No: Vol. 19, No. 4 (2022)
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


Your IP address: 18.205.56.183
 
Home (Search)
API
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-