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IEEE AFRICON. 6th Africon Conference in Africa,最新文献

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Design of a DSP based controller for power electronics applications 基于DSP的电力电子控制器设计
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1160006
G. van Heerden, H. Mouton
{"title":"Design of a DSP based controller for power electronics applications","authors":"G. van Heerden, H. Mouton","doi":"10.1109/AFRCON.2002.1160006","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1160006","url":null,"abstract":"Power electronics engineers frequently need a flexible way to implement the control of a new design. This paper discusses the design of a digital signal processor based power electronics controller, which provides the level of flexibility needed. To test the first prototype of the controller, the current supplied to an inductive load by a phase arm, was controlled.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132694848","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: 3
Networking Africa: a case for VoIP 网络非洲:VoIP案例
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146863
P. Chitamu, D. Vannucci
{"title":"Networking Africa: a case for VoIP","authors":"P. Chitamu, D. Vannucci","doi":"10.1109/AFRCON.2002.1146863","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146863","url":null,"abstract":"Penetration of telecommunication services in Africa is generally quite low outside major cities. The reason for this is the use of technologies that do not scale well in terms of capacity versus coverage in low tele-density traffic areas. The advent of IP-based networking for voice and data services promises to provide cost-effective solution to the tele-density problem because it addresses the decentralisation of the access and switching levels of the network that are reportedly the most costly part of any national network. We propose a network topology to support Africa-wide VoIP networking by the interconnection of segmented area-wide networks. It is shown that using an IP-based access network and provisioning based on teletraffic area-wide network demarcations, we can achieve a network solution to support different services and address the needs of the different market segments in low-density traffic areas.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132866492","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: 6
Increasing the bandwidth of a microstrip patch antenna with a single parallel resonant circuit 用单个并联谐振电路增加微带贴片天线的带宽
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159963
D. de Haaij, J. Odendaal, J. Joubert
{"title":"Increasing the bandwidth of a microstrip patch antenna with a single parallel resonant circuit","authors":"D. de Haaij, J. Odendaal, J. Joubert","doi":"10.1109/AFRCON.2002.1159963","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159963","url":null,"abstract":"Results are presented to show that the impedance bandwidth of a microstrip patch antenna can be improved substantially by adding a single parallel LC resonator in the form of an open- and short-circuited stub to the feed structure of the antenna. Computed and measured results are presented, demonstrating, a bandwidth improvement of more than 100%.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133382683","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: 5
A telecommunications development model for developing countries 发展中国家的电信发展模式
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146862
D. Bogojevic, S. Lazovic
{"title":"A telecommunications development model for developing countries","authors":"D. Bogojevic, S. Lazovic","doi":"10.1109/AFRCON.2002.1146862","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146862","url":null,"abstract":"This paper analyses the relationship between economic development, the information communications market and telecommunications information penetration on global and national levels of developed and developing countries. A model for telecommunications development, potentially adequate for developing countries with low and lower middle income, is described. On the basis of the results, a general proposal for accelerating telecommunications information penetration through information communications market is put forward.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114140719","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
New hardware implementation of parallel 1D FFT 并行一维FFT的新硬件实现
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146802
D. Dawoud
{"title":"New hardware implementation of parallel 1D FFT","authors":"D. Dawoud","doi":"10.1109/AFRCON.2002.1146802","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146802","url":null,"abstract":"In this paper, we propose a new technique for the parallel implementation of 1D FFT. The paper allocates one two-port memory unit for each butterfly-processing unit. The two output words of the i/sup th/ memory module are connected permanently to the inputs of the i/sup th/ butterfly processor. The interconnection network used uses a limited number of two-way switches. This layout cancels completely the transposition operation required in all the existing implementations. The address generating system is very simple and results in conflict-free addressing. The proposed system reduces the total processing time and leaves the results in the different memory modules arranged in the natural order that saves another transposition operation normally used with existing systems.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114933905","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
Flexible network for Internet access in rural areas 灵活的农村互联网接入网络
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146836
A.I. Kilenga, S.H. Mneney
{"title":"Flexible network for Internet access in rural areas","authors":"A.I. Kilenga, S.H. Mneney","doi":"10.1109/AFRCON.2002.1146836","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146836","url":null,"abstract":"The emergence and growth of wireless networks is driven by the need to lower the cost associated with network infrastructures by deploying wireless networks that offer access flexibility, at an affordable cost. Proliferation of wireless data communication and the Internet in urban areas have changed how people and businesses communicate. This is not the case in rural areas of developing countries where 80% of the population is found. We propose a flexible network for Internet services using CDMA access, which has the potential to cover the longer ranges characteristic of rural areas. We study the performance of the RAKE receiver with parallel interference canceller (PIC) structure in mitigating multiple access interference in rural multipath channels.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133854911","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
On the regularity of multidimensional nonseparable cascade filterbanks 多维不可分离级联滤波器组的正则性
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146853
S. Belayneh
{"title":"On the regularity of multidimensional nonseparable cascade filterbanks","authors":"S. Belayneh","doi":"10.1109/AFRCON.2002.1146853","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146853","url":null,"abstract":"This paper shows the relation of zeros of lower and higher dimensional filters based on the definition of regularity conditions for cascade structures. The relation is used to construct multidimensional regular filters. Two illustrative examples are also included.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133897882","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
Development issues in a DSP based software radio 基于DSP的软件无线电的开发问题
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146861
J. Schoeman, B. Maharaj
{"title":"Development issues in a DSP based software radio","authors":"J. Schoeman, B. Maharaj","doi":"10.1109/AFRCON.2002.1146861","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146861","url":null,"abstract":"Future generation WCDMA mobile systems will require a larger number of radio base stations to meet the high demand of data services. The implementation of the receiver in software radio provides for flexibility and cost efficiency that can adapt to changing standards and new protocols, improved complexity and upgradability of these base stations/node B's. This paper discusses some of the critical design issues that should be considered when developing a software radio. These include the development of a fast digital demodulation scheme and certain aspects of PC board design that should be considered. Results of the simulation and implementation of the digital demodulation and phase approximation in both hardware and software will be presented for the prototype FM software radio being developed.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133970616","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
Optimal power utilisation with doubly-fed full-controlled induction generator 最佳的电力利用与双馈全控制感应发电机
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159997
W. Hofmann, F. Okafor
{"title":"Optimal power utilisation with doubly-fed full-controlled induction generator","authors":"W. Hofmann, F. Okafor","doi":"10.1109/AFRCON.2002.1159997","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159997","url":null,"abstract":"Doubly-fed induction generators are mainly used for wind energy conversion in MW power plants. They are controlled by a rotor inverter and DC-linked front-end converter while the stator is linked directly to the grid. If a DC-bus bar is available, a double feeding can occur about the inverter. This paper describes a doubly-fed full-controlled induction wind generator which offers a higher flexibility of stator side control to ensure minimal losses as well as optimal power utilisation. The special wind converter system has been investigated at a glance of installed off-shore MW-generators, where a DC-transmission is advantageous because of the avoided reactive power.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"27 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133426281","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
Managing the deregulation and privatisation of the Nigerian electricity industry 管理尼日利亚电力行业的放松管制和私有化
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146883
A. Odubiyi, I. Davidson
{"title":"Managing the deregulation and privatisation of the Nigerian electricity industry","authors":"A. Odubiyi, I. Davidson","doi":"10.1109/AFRCON.2002.1146883","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146883","url":null,"abstract":"Power sector deregulation is a global phenomena and the Nigerian state has embarked on privatisation and deregulation with the introduction of competition in its electricity industry. Economic, environmental issues and regulatory challenges, and changing public perception have contributed to the profound changes or reform being embarked upon by developed and developing countries. This paper discusses the management process of the deregulation and privatisation of the electricity industry in Nigeria, and offers proposals to avoid pitfalls in deregulation.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116402339","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: 5
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