2021 IEEE AFRICON最新文献_第5页

Local Power Control using Wireless Sensor System for Microgrids in Africa 非洲微电网无线传感系统的局部电力控制

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570970

U. Hilleringmann, D. Petrov, Ibrahim Mwammenywa, Geoffrey Mark Kagarura

引用次数: 2

Assisting Polyculture Farming in Africa 协助非洲混养农业

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570957

S. Adebola, Ken Goldberg

引用次数: 1

Step-Like Ultra-Wideband Antenna Applicable for 5G Communication 适用于5G通信的阶梯式超宽带天线

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570966

Joseph Owusu, Oppong Nathaniel, Foeh Emmanuel, K. Diawuo

{"title":"Step-Like Ultra-Wideband Antenna Applicable for 5G Communication","authors":"Joseph Owusu, Oppong Nathaniel, Foeh Emmanuel, K. Diawuo","doi":"10.1109/africon51333.2021.9570966","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570966","url":null,"abstract":"One problem of Ultra-wideband systems is reducing the size of the antenna while still maintaining the antenna’s performance in the Ultra-wideband frequency range. This is also a requirement in 5G wireless communication. 5G antennas are to have low profiles, simple structure, have a lighter weight, and a high gain. In this paper, a novel antenna with two steps on the patch and defected ground structure for UWB and 5G applications are presented. It has a volume of 32 x 32 x 1.6mm3. The antenna is realized on an FR4 substrate and fed with a 50Ω microstrip feedline. The design and simulation of the antenna were carried out using CST studio. The stepped patch is used to improve the impedance matching at the lower frequencies while the slotted ground is used to improve that of the higher frequencies. The antenna has high impedance matching characteristics over the entire operating bandwidth from 2.95 to 40 GHz at return loss ≤ 10 dB and Voltage Standing Wave Ratio < 2 from the simulated results with its highest gain at 9.5 GHz frequency. The antenna exhibits multiband characteristics at frequency ranges of 3.40-3.60, 8.63-10.37, 13.53-14.69, 18.82-20.06, 23.95- 24.56, 27.22-28.52 GHz frequency band at 20 dB. The antenna has good gain, and a low return loss of 20 dB at 28 GHz, making it suitable for 5G applications. The significance of the slots and Defected Ground Structure are also simulated and presented in this paper. The antenna can be used for UWB applications due to its wider bandwidth.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130125625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570980

引用次数: 0

Optimized, stabilized and narrow linewidth CW-Erbium fibre ring laser 优化、稳定、窄线宽的w -铒光纤环形激光器

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570977

Kaboko Jean-Jacques Monga, M. Grobler, Kabuya Isaac Kamiba

{"title":"Optimized, stabilized and narrow linewidth CW-Erbium fibre ring laser","authors":"Kaboko Jean-Jacques Monga, M. Grobler, Kabuya Isaac Kamiba","doi":"10.1109/africon51333.2021.9570977","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570977","url":null,"abstract":"This paper reports the experimental characterization of a ring configuration erbium-doped fibre laser operating in continuous wave (CW). The output power stability and the linewidth as a function of the cavity parameters were investigated. The fibre laser cavity includes two filters namely, a fibre Bragg grating (FBG) and a fibre Fabry-Perot (FP) tunable filter. Without altering the basic cavity configuration, the study focused on the optimization of key parameters of the fibre laser cavity namely, the erbium-doped fibre length, the pump power, the output coupling ratio and the erbium ion concentration. We have demonstrated that the output power, as well as the power stability of the fibre laser, increased as the output coupling ratio. The maximum power fluctuation of the output power was 7.52 %, corresponding to 0.24 dB and was obtained for a 10 % output coupling. Power stability of 0.71 % and 0.8 % were demonstrated for 80 % and 90 % coupling ratios, respectively. To improve the power stability, we introduced a 2 m unpumped erbium-doped fibre laser into the fibre laser cavity. A stable fibre laser with a linewidth of 10 kHz was obtained during a measurement period of 120 min.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126156954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Network Architecture Design for Floating Cities 浮动城市网络架构设计

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570904

A. Periola, A. Alonge, K. Ogudo

引用次数: 0

A Novel Resource Allocation for HAP Wireless Networks Exploiting TVWS Spectrum 利用TVWS频谱的HAP无线网络资源分配新方法

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570928

H. M. Hussien, K. Katzis, L. Mfupe, T. Ephrem

{"title":"A Novel Resource Allocation for HAP Wireless Networks Exploiting TVWS Spectrum","authors":"H. M. Hussien, K. Katzis, L. Mfupe, T. Ephrem","doi":"10.1109/africon51333.2021.9570928","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570928","url":null,"abstract":"Cognitive radio-based TV White Space (TVWS) is a promising idea which seeks to increase spectrum utilization by opportunistically accessing spectrum initially licensed to TV transmitters or incumbents. Orthogonal frequency multiple access (OFDM) is thought to be a promising technology for TVWS systems. In this paper, we consider an OFDM based cognitive High-Altitude Platform (HAP) exploiting the TVWS spectrum. We employ dynamic resource allocation for providing wireless access from a HAP at an altitude of 20km, while utilizing the TVWS spectrum. This paper focuses on the resource allocation algorithms, which are designed to increase the system transmission rate of secondary users while keeping the disturbance applied to the incumbent band below a threshold level and the overall power within a range using the Artificial Immune System Algorithm. As per the simulation demonstrated so far, the proposed algorithm outperforms the water-filling algorithm, implying that the system transmission rate is greatly optimized. Moreover, the proposed resource allocation algorithm allocates resources to users in a fair manner, without favoring any particular user, and has good convergence performance.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125916109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Improved Conditional GAN for Aerial Image Segmentation 改进的条件GAN航空图像分割

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570942

M. Dimoiu, D. Popescu, L. Ichim

引用次数: 1

Performance evaluation of 3G (UMTS Network) for E-Learning Video Streaming 3G (UMTS网络)在线学习视频流的性能评估

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570866

Mariam Khamis Ali, F. Simba

{"title":"Performance evaluation of 3G (UMTS Network) for E-Learning Video Streaming","authors":"Mariam Khamis Ali, F. Simba","doi":"10.1109/africon51333.2021.9570866","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570866","url":null,"abstract":"Advancement in technology has led teaching and learning to improve from traditional to electronic learning (E-Learning). E-learning consists of different multimedia including videos which facilitate learning much easier. Unfortunately, videos accessed on e-learning platform suffer in Quality of Service (QoS) and Quality of Experience (QoE). The aim of this paper is to evaluate QoS in terms of jitter, delay and packet loss, also to evaluate and compare objective and subjective QoE of e-learning video transmitted via Universal Mobile Telecommunication System (UMTS) network. A model of UMTS network was developed by using Network Simulator 2 (NS2) and EvalVid framework. The developed model was used for e-learning video streaming. The streamed video was objectively and subjectively evaluated for its QoE, also jitter, delay and packet loss were used as the parameters for QoS. The obtained results has shown that e-learning video streaming delivered through 3G/UMTS suffers packet losses that exceeds the accepted value of 1%, hence poor video streaming QoS. Subjective QoE turned out to be much worse than objective QoE. Therefore, this paper recommends preference in using subjective QoE, because it gives real feelings of users with regards to QoS. Results suggest that UMTS is not suitable for e-learning video streaming.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123162517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Intrusion Detection for Water Distribution Systems based on an Hybrid Particle Swarm Optimization with Back Propagation Neural Network 基于混合粒子群算法和反向传播神经网络的配水系统入侵检测

2021 IEEE AFRICON Pub Date : 2021-09-13 DOI: 10.1109/africon51333.2021.9570951

O. A. Alimi, K. Ouahada, A. Abu-Mahfouz, S. Rimer, Kuburat Oyeranti Adefemi Alimi

{"title":"Intrusion Detection for Water Distribution Systems based on an Hybrid Particle Swarm Optimization with Back Propagation Neural Network","authors":"O. A. Alimi, K. Ouahada, A. Abu-Mahfouz, S. Rimer, Kuburat Oyeranti Adefemi Alimi","doi":"10.1109/africon51333.2021.9570951","DOIUrl":"https://doi.org/10.1109/africon51333.2021.9570951","url":null,"abstract":"The increasing integration of advanced information and communication tools in industrial control systems (ICS) has vastly increased the vulnerabilities and threats of intrusions into the various critical infrastructures which include the water distribution system, electrical power system, etc. that rely on the ICS systems. Currently, providing and ensuring adequate security for these ICS infrastructures are major concerns globally. The quick and accurate detection of any intrusive action into the ICS systems is highly important. Traditional intrusion detection systems (IDS) have exhibited worrying forms of limitations and shortcomings due to the heterogeneity of different cyberattacks and intrusions. Thus, there are needs to devise effective security measures. This paper proposes an IDS model based on the hybridization of particle swarm optimization (PSO) with back-propagation neural network (BPNN) for classifying intrusions in water system infrastructure. The PSO is used to optimize the parameters for the BPNN, thus improving the efficiency of classification. For the validation of the proposed method, the iTrust Lab's secure water treatment dataset was used for experimentation. Using prominent classification metrics, the 97% accuracy and 98.7% precision results achieved using the developed BPNN-PSO model is better compared to other methods including models from related works. Thus, the proposed model can meet the requirements of cyberattacks and intrusions detection in practical water distribution infrastructure.","PeriodicalId":170342,"journal":{"name":"2021 IEEE AFRICON","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131457280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4