Pub Date : 2004-11-08DOI: 10.1109/EDMO.2004.1412413
J. van Wyk, A. Hattingh
The purpose of this study is to develop a unique software protocol for a low power radio frequency network, in the 433 Mhz band, for the purpose of automatic initialization of nodes and remote setup of node parameters. A state-of-the-art routing protocol was developed to effectively route data packets through the network with low power consumption in mind. The algorithm that is proposed for the network use GPS coordinates to establish topographical coverage. Software was developed to determine distances between nodes. The second phase is to remove paths that are not within the minimum distance of two node controllers with clear line of site and electromagnetic propagation in mind. The shortest path to nodes is now determined by using Dijkstra's algorithm. The routing algorithm can delete faulty nodes and paths from the routing table and redo the shortest path algorithm.
{"title":"Development of a software protocol for farm management low power wireless networks","authors":"J. van Wyk, A. Hattingh","doi":"10.1109/EDMO.2004.1412413","DOIUrl":"https://doi.org/10.1109/EDMO.2004.1412413","url":null,"abstract":"The purpose of this study is to develop a unique software protocol for a low power radio frequency network, in the 433 Mhz band, for the purpose of automatic initialization of nodes and remote setup of node parameters. A state-of-the-art routing protocol was developed to effectively route data packets through the network with low power consumption in mind. The algorithm that is proposed for the network use GPS coordinates to establish topographical coverage. Software was developed to determine distances between nodes. The second phase is to remove paths that are not within the minimum distance of two node controllers with clear line of site and electromagnetic propagation in mind. The shortest path to nodes is now determined by using Dijkstra's algorithm. The routing algorithm can delete faulty nodes and paths from the routing table and redo the shortest path algorithm.","PeriodicalId":424447,"journal":{"name":"12th International Symposium on Electron Devices for Microwave and Optoelectronic Applications, 2004. EDMO 2004.","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127923075","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}
Pub Date : 2004-11-08DOI: 10.1109/EDMO.2004.1412406
A. Kurien, B. V. van Wyk, L. Snyman
Telecommunication networks across Africa have witnessed the widespread use of mobile technologies to meet the demands of access to basic telecommunication services. With the rapid growth of these networks, greater demands are being placed on the development of wireless networks in terms of efficiency and cost-effectiveness. This paper focuses on work currently being done in the development of a cellular network planning tool that takes into consideration various 'environment' related data to influence the traditional cellular network planning methodologies. Particular emphasis is placed on the utilization of so called 'intelligent' algorithms to make effective decisions in the choice optimum values for various parameters in network. Specific focus is made on the choice of base station placement and subscriber characteristic identification for capacity related planning.
{"title":"An environment-based network planning tool","authors":"A. Kurien, B. V. van Wyk, L. Snyman","doi":"10.1109/EDMO.2004.1412406","DOIUrl":"https://doi.org/10.1109/EDMO.2004.1412406","url":null,"abstract":"Telecommunication networks across Africa have witnessed the widespread use of mobile technologies to meet the demands of access to basic telecommunication services. With the rapid growth of these networks, greater demands are being placed on the development of wireless networks in terms of efficiency and cost-effectiveness. This paper focuses on work currently being done in the development of a cellular network planning tool that takes into consideration various 'environment' related data to influence the traditional cellular network planning methodologies. Particular emphasis is placed on the utilization of so called 'intelligent' algorithms to make effective decisions in the choice optimum values for various parameters in network. Specific focus is made on the choice of base station placement and subscriber characteristic identification for capacity related planning.","PeriodicalId":424447,"journal":{"name":"12th International Symposium on Electron Devices for Microwave and Optoelectronic Applications, 2004. EDMO 2004.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125585663","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}
Pub Date : 2004-11-08DOI: 10.1109/EDMO.2004.1412392
R. Negra, W. Bachtold
A highly efficient monolithically integrated class-E power amplifier for the 22-25 GHz range is presented. The circuit is fabricated with a 0.12 /spl mu/m GaAs pHEMT process using coplanar waveguide technology. Careful selection and design of the load network is crucial for obtaining high efficiency. Measurement results show a peak power added efficiency of more than 42% at 23 GHz from a 2.2 V supply. To the authors' knowledge, this is the highest power added efficiency for class-E amplifiers at Ka-band reported up to date.
提出了一种适用于22-25 GHz频段的高效单片集成e类功率放大器。该电路采用共面波导技术，采用0.12 /spl μ m GaAs pHEMT工艺制作。负荷网的合理选择和设计是保证电网高效运行的关键。测量结果表明，2.2 V电源在23 GHz时的峰值功率增加效率超过42%。据作者所知，这是迄今为止报道的ka波段e类放大器的最高功率附加效率。
{"title":"Switched-mode high-efficiency Ka-band MMIC power amplifier in GaAs pHEMT technology","authors":"R. Negra, W. Bachtold","doi":"10.1109/EDMO.2004.1412392","DOIUrl":"https://doi.org/10.1109/EDMO.2004.1412392","url":null,"abstract":"A highly efficient monolithically integrated class-E power amplifier for the 22-25 GHz range is presented. The circuit is fabricated with a 0.12 /spl mu/m GaAs pHEMT process using coplanar waveguide technology. Careful selection and design of the load network is crucial for obtaining high efficiency. Measurement results show a peak power added efficiency of more than 42% at 23 GHz from a 2.2 V supply. To the authors' knowledge, this is the highest power added efficiency for class-E amplifiers at Ka-band reported up to date.","PeriodicalId":424447,"journal":{"name":"12th International Symposium on Electron Devices for Microwave and Optoelectronic Applications, 2004. EDMO 2004.","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126279844","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}
Pub Date : 2004-11-08DOI: 10.1109/EDMO.2004.1412404
T. Hoang, P. LeMinh, J. Holleman, V. Zieren, M. Goossens, J. Schmitz
The infrared light emission of lateral p/sup +/-p-n/sup +/ diodes realized on SIMOX-SOI (separation by implantation of oxygen - silicon on insulator) substrates has been studied. The confinement of the free carriers in one dimension due to the buried oxide was suggested to be a key point to increase the band-to-band recombination probability in silicon light emitters. We found in our devices an external quantum efficiency comparable to previous results presented in the literature. The wavelength range of the emission was found to be 900-1300 nm which is common for indirect band to band recombination in Si. The SOI technology incorporates an insulating layer between the thin single crystal silicon layer and the much thicker substrate. This electrically insulating layer is also a thermal isolator and so self-heating effects are common in devices fabricated on SOI wafers. Investigation of its influence on the light emission and the light distribution in the device has been carried out in our research. In this paper, the characteristics of the device with different active region lengths were investigated and explained quantitatively based on the recombination rate of carriers inside the active area by using the simulation model in Silvaco.
{"title":"A high efficiency lateral light emitting device on SOI","authors":"T. Hoang, P. LeMinh, J. Holleman, V. Zieren, M. Goossens, J. Schmitz","doi":"10.1109/EDMO.2004.1412404","DOIUrl":"https://doi.org/10.1109/EDMO.2004.1412404","url":null,"abstract":"The infrared light emission of lateral p/sup +/-p-n/sup +/ diodes realized on SIMOX-SOI (separation by implantation of oxygen - silicon on insulator) substrates has been studied. The confinement of the free carriers in one dimension due to the buried oxide was suggested to be a key point to increase the band-to-band recombination probability in silicon light emitters. We found in our devices an external quantum efficiency comparable to previous results presented in the literature. The wavelength range of the emission was found to be 900-1300 nm which is common for indirect band to band recombination in Si. The SOI technology incorporates an insulating layer between the thin single crystal silicon layer and the much thicker substrate. This electrically insulating layer is also a thermal isolator and so self-heating effects are common in devices fabricated on SOI wafers. Investigation of its influence on the light emission and the light distribution in the device has been carried out in our research. In this paper, the characteristics of the device with different active region lengths were investigated and explained quantitatively based on the recombination rate of carriers inside the active area by using the simulation model in Silvaco.","PeriodicalId":424447,"journal":{"name":"12th International Symposium on Electron Devices for Microwave and Optoelectronic Applications, 2004. EDMO 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129249791","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}
Pub Date : 2004-09-16DOI: 10.1109/EDMO.2004.1412407
S. Tsai, R. Plumb, I. White
A novel hybrid infrared-radio access network for indoor nano-cells is introduced, in which radio is used as a back-up if the infrared propagation path is inoperable due to incomplete coverage or shadowing. The proposed system is originated from the radio over fiber concept, associated with arrayed waveguide gratings (AWG) and subcarrier multiplexing (SCM) technologies, and capable of serving multiple users simultaneously with multi-services. A model is designed for the proposed hybrid infrared-radio access network, using the VPI software package to investigate the physical layer issues, with emphasis on modulation schemes. Physical characteristics of infrared channels using intensity modulation with direct detection (IM/DD) are presented. The performance of a hybrid infrared-radio AWG-SCM access network with 4 subcarrier frequencies, 2.4, 5, 17 and 24 GHz, using different modulation schemes is discussed in detail.
{"title":"Indoor hybrid infrared-radio access network","authors":"S. Tsai, R. Plumb, I. White","doi":"10.1109/EDMO.2004.1412407","DOIUrl":"https://doi.org/10.1109/EDMO.2004.1412407","url":null,"abstract":"A novel hybrid infrared-radio access network for indoor nano-cells is introduced, in which radio is used as a back-up if the infrared propagation path is inoperable due to incomplete coverage or shadowing. The proposed system is originated from the radio over fiber concept, associated with arrayed waveguide gratings (AWG) and subcarrier multiplexing (SCM) technologies, and capable of serving multiple users simultaneously with multi-services. A model is designed for the proposed hybrid infrared-radio access network, using the VPI software package to investigate the physical layer issues, with emphasis on modulation schemes. Physical characteristics of infrared channels using intensity modulation with direct detection (IM/DD) are presented. The performance of a hybrid infrared-radio AWG-SCM access network with 4 subcarrier frequencies, 2.4, 5, 17 and 24 GHz, using different modulation schemes is discussed in detail.","PeriodicalId":424447,"journal":{"name":"12th International Symposium on Electron Devices for Microwave and Optoelectronic Applications, 2004. EDMO 2004.","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114935820","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}
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