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Error correction of frequency-selective fading channels with spectral nulls codes 使用谱零码的频率选择衰落信道的误差校正
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401560
K. Ouahada, H. C. Ferreira, A. J. Snyders, A. Vinck, T. Swart
{"title":"Error correction of frequency-selective fading channels with spectral nulls codes","authors":"K. Ouahada, H. C. Ferreira, A. J. Snyders, A. Vinck, T. Swart","doi":"10.1109/AFRCON.2007.4401560","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401560","url":null,"abstract":"In this paper, we investigate a prior error correction technique for frequency selective fading channels. Spectral nulls codes with nulls at submultiple frequencies are used to avoid fades at the corresponding frequencies. Coincide the spectrum null at the corresponding fading frequency and playing with its wideness, will minimize the bit errors caused by the channel.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131927024","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
Technology roadmap process to compare commercial broadband technologies available to SME and SOHO owners in South Arica 技术路线图流程，以比较南非中小企业和SOHO业主可用的商业宽带技术
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401636
J. Slabbert, A. Buys
{"title":"Technology roadmap process to compare commercial broadband technologies available to SME and SOHO owners in South Arica","authors":"J. Slabbert, A. Buys","doi":"10.1109/AFRCON.2007.4401636","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401636","url":null,"abstract":"A technology roadmap process is proposed to determine the stakeholders in the broadband Internet arena as well as their possible impact on future broadband adoption in Southern Africa. The current status for available broadband technologies is accessed and then compared to the technology specification as provided by standards authorities or technology providers. New broadband technologies, currently in advanced pilot projects, are identified and their possible impact on current broadband technologies is discussed. The importance of standards in the roll out of new technologies is assessed and recommendations regarding commercial broadband technologies available to SME and SOHO in South Africa are made.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115647559","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: 1
The technology assessment of demand side bidding within the South African context 南非环境下需求方投标的技术评估
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401466
H. K. Grover, M. Pretorius
{"title":"The technology assessment of demand side bidding within the South African context","authors":"H. K. Grover, M. Pretorius","doi":"10.1109/AFRCON.2007.4401466","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401466","url":null,"abstract":"South Africa is currently in the grips of a severe power supply capacity constraint; January 2007 has already seen blackouts throughout the country, the worst is still expected in the months to come. As a measure of immediate remedy Eskom is turning to Demand Side Bidding (DSB); a methodology whereby the demand side has an opportunity to sell back flexible load to the supply side. Through this paper an assessment of DSB is carried out, with the aim of evaluating and gauging the current and potential future standing of DSB as a technology product within the South African context. The assessment is carried out using the technology balance sheet, the technology road map and the scenarios approach. The results of the assessment show that DSB is not a sustainable solution to the current power supply capacity constraint Eskom is facing.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114190438","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: 12
Feedback-linearised control of a solar power platform with nonlinear measurements 具有非线性测量的太阳能发电平台的反馈线性化控制
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401568
J. Agee, A. Jimoh
{"title":"Feedback-linearised control of a solar power platform with nonlinear measurements","authors":"J. Agee, A. Jimoh","doi":"10.1109/AFRCON.2007.4401568","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401568","url":null,"abstract":"The paper presents the design and simulation results of the input-state feedback-linearised control of a polar- axis solar tracking platform, capable of hosting ten 300 W solar photovoltaic panels. The controller reduced the settling time of the open-loop platform system from 105 seconds to 2 seconds. Compared with a linear controller we had designed for the same system, the new controller also minimized system accelerations.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123210217","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
Next-generation wireless networks: A new world, from bottom to top 下一代无线网络:从下到上的新世界
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401584
D. Foty
{"title":"Next-generation wireless networks: A new world, from bottom to top","authors":"D. Foty","doi":"10.1109/AFRCON.2007.4401584","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401584","url":null,"abstract":"As data content mushrooms and becomes increasingly dispersed, the demand for (and need for) bandwidth - both wired and wireless - continues to increase; however, technology has demonstrably not been up to this task. A major intellectual gap has been the attempt to address this demand via \"digital thinking,\" in which transistors and power can be used gratuitously to overwhelm the problem; this is simply not working. Despite a number of challenges, millimeter-wave radio is slowly emerging as a unique way to transcend the \"digital mindset\" and address a wide variety of bandwidth challenges - by making bandwidth available without outlandish demands in complexity and power consumption. In addition to the \"usual\" applications, the basic nature of millimeter-wave radio offers the prospect of revolutionizing network topologies, allowing for the development of new network infrastructures - such as mesh and pseudo-neural networks.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"504 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123564812","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
A LabVIEW courseware customized for pre-college learners 一个为大学预科学习者定制的LabVIEW课件
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401571
S. D. du Preez, S. Sinha, M. Hutton
{"title":"A LabVIEW courseware customized for pre-college learners","authors":"S. D. du Preez, S. Sinha, M. Hutton","doi":"10.1109/AFRCON.2007.4401571","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401571","url":null,"abstract":"The paper details the development of a courseware for LabVIEW. LabVIEW is a graphical programming language that serves as a platform for measurements and automation. The courseware is intended to be customized for South African school leaving candidates, further referred to as pre-college learners. The courseware is aimed at authenticated remote learning (online training) as well as classroom-based facilitated training. The development is an integrated compilation of experiments based on LabVIEW and PHP/SQL (to administer and manage the learners). The courseware is developed in alignment with the outcomes proposed in the new curriculum statements for South Africa, but is also applicable to other countries, in general.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121694776","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: 9
Load profiling in an opening electricity market 开放电力市场的负荷分析
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401464
T. Marijanic, D. Karavidović
{"title":"Load profiling in an opening electricity market","authors":"T. Marijanic, D. Karavidović","doi":"10.1109/AFRCON.2007.4401464","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401464","url":null,"abstract":"With the opening of Croatian electricity market the system operators are confronted with new obligations. One of them is the necessity to know customers' load profiles, which are to be used for consumption planning and calculation of balance settlements. A method has to be implemented that would give a sufficiently accurate picture of hourly consumption of customers without appropriate meters. The paper presents currently used load profiles and the project that will establish Croatian standard load profiles.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122663180","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: 8
Fast dynamic liquid level sensor based on liquid resistance 基于液阻的快速动态液位传感器
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401558
Guilin Zheng, Hongyan Zong, X. Zhuan, Jianguo Luan
{"title":"Fast dynamic liquid level sensor based on liquid resistance","authors":"Guilin Zheng, Hongyan Zong, X. Zhuan, Jianguo Luan","doi":"10.1109/AFRCON.2007.4401558","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401558","url":null,"abstract":"Based on the characteristics of liquid resistance, a new transient liquid sensor has been designed by means of ratio measurement. A new AC exciting constant current source is used as excitation source for the sensor, which not only maintains all features of an ideal exciting constant current source in terms of accuracy, disturbance rejection and stability, but also solves the problem arising from the polarization effect by changing the current directions alternatively. Analyzing the influence on the characteristics of liquid resistance under different temperature and medium, the model of the sensor is built and the model parameters are determined. We adopt the single-chip microprocessor as the measuring unit and control unit of the sensor. Both theoretical analysis and experimental results are presented to show the effectiveness of the sensor. Results show that it is sensitive enough to trace the variability of the liquid level.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125576302","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: 15
Comparison of two terrestrial atmospheric turbulence suppression algorithms (March 2007) 两种地面大气湍流抑制算法的比较(2007年3月)
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401539
B.D. Walters, W. Clarke
{"title":"Comparison of two terrestrial atmospheric turbulence suppression algorithms (March 2007)","authors":"B.D. Walters, W. Clarke","doi":"10.1109/AFRCON.2007.4401539","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401539","url":null,"abstract":"This paper describes the problem of capturing video through turbulent atmosphere (also referred to as heat shimmer or heat scintillation) and describes some of the existing methods used in an attempt to counteract the problem. Within this problem of imaging through turbulent atmosphere there is a distinct lack of comparisons between methods and a reliable metric for digital images. This paper contributes through the selection of two algorithms which are implemented, tested and compared, one a power spectrum restoration approach from the early 1990's and a newer image registration and fusion based method. The results show the ability of the old power spectrum method to stabilize the image although local object motion presents a problem, as well as the computational complexity of the image registration method.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129671047","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: 1
Data mining - a technique used to extract information from tan delta Measurements on medium Voltage Induction Motors 数据挖掘-一种用于从中压感应电动机的tan delta测量中提取信息的技术
AFRICON 2007 Pub Date : 2007-12-12 DOI: 10.1109/AFRCON.2007.4401639
P.M. John, J. D. de Kock
{"title":"Data mining - a technique used to extract information from tan delta Measurements on medium Voltage Induction Motors","authors":"P.M. John, J. D. de Kock","doi":"10.1109/AFRCON.2007.4401639","DOIUrl":"https://doi.org/10.1109/AFRCON.2007.4401639","url":null,"abstract":"The study attempted to understand the condition of the insulation system and to classify the data according to its condition. Data mining processes were used to gain insight into the data and the condition of the insulation system. The different stages of data mining are explained. An analysis was done using self-organizing maps, which is an unsupervised neural network technique. Hierarchical and K-mean clustering techniques were used to classify the data. The results of the different techniques were compared to an expert's assessment. A comparison was done between the different techniques used. The patterns in the different features of the data due to ageing were observed. The data was qualitatively assessed and classified into groups according to the deterioration of the insulation system using the classification techniques. Finally the results correlated well with the expert's assessment.","PeriodicalId":112129,"journal":{"name":"AFRICON 2007","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129932188","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
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