Pub Date : 2000-11-06DOI: 10.1109/APWC.2000.900153
F. Ramos A., V. Kontorovitch, M. Lara
The Suzuki model (a process with lognormal shadowing superimposed over Rayleigh fading) is generalized using Nakagami instead of Rayleigh fading. The PDF of this joint process (generalized Suzuki process) is analyzed and some approximations for it are tested. The level crossings' PDF (used to evaluate the outage probability) for this joint process are also studied. The gamma distribution proves to be useful to approximate both PDFs.
{"title":"Generalization of Suzuki model for analog communication channels","authors":"F. Ramos A., V. Kontorovitch, M. Lara","doi":"10.1109/APWC.2000.900153","DOIUrl":"https://doi.org/10.1109/APWC.2000.900153","url":null,"abstract":"The Suzuki model (a process with lognormal shadowing superimposed over Rayleigh fading) is generalized using Nakagami instead of Rayleigh fading. The PDF of this joint process (generalized Suzuki process) is analyzed and some approximations for it are tested. The level crossings' PDF (used to evaluate the outage probability) for this joint process are also studied. The gamma distribution proves to be useful to approximate both PDFs.","PeriodicalId":106689,"journal":{"name":"2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133247341","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 : 2000-11-01DOI: 10.1109/APWC.2000.900140
M. Vrancken, G. Vandenbosch
Integral equation modelling of electromagnetic radiation and interference phenomena in planar circuits and antennas offers exact solutions usually at the cost of excessive computation time, especially when arbitrary 3D conducting surfaces are involved. However, for most of these problems, the geometry can be restricted to the 2.5D case, that is, only horizontal (parallel to layer structure) and vertical conducting surfaces (normal to the dielectric layers) are present. This paper reports progress in the full wave analysis of these structures. An alternative but generally valid form for the electric field in the stratified medium is presented. For the 2.5D geometry, but modelling all current components, the availability of analytical expressions for the Green's functions in the spectral domain is then exploited to perform a mixed spectral and spatial calculation of the matrix elements required to solve the integral equation. An overall reduction of computation time is hereby envisaged. Numerical results of actual 2.5D structures are provided.
{"title":"Alternative formulation of the electric field in a stratified medium applied with a mixed spectral-spatial coupling calculation for integral equation modelling of vertical current sheets","authors":"M. Vrancken, G. Vandenbosch","doi":"10.1109/APWC.2000.900140","DOIUrl":"https://doi.org/10.1109/APWC.2000.900140","url":null,"abstract":"Integral equation modelling of electromagnetic radiation and interference phenomena in planar circuits and antennas offers exact solutions usually at the cost of excessive computation time, especially when arbitrary 3D conducting surfaces are involved. However, for most of these problems, the geometry can be restricted to the 2.5D case, that is, only horizontal (parallel to layer structure) and vertical conducting surfaces (normal to the dielectric layers) are present. This paper reports progress in the full wave analysis of these structures. An alternative but generally valid form for the electric field in the stratified medium is presented. For the 2.5D geometry, but modelling all current components, the availability of analytical expressions for the Green's functions in the spectral domain is then exploited to perform a mixed spectral and spatial calculation of the matrix elements required to solve the integral equation. An overall reduction of computation time is hereby envisaged. Numerical results of actual 2.5D structures are provided.","PeriodicalId":106689,"journal":{"name":"2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121106545","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 : 1900-01-01DOI: 10.1109/APWC.2000.900137
K. Pan, J. Bernhard, T. Moore
Rapid developments in the wireless communication industry require the next generation of portable antenna designs to be internal. While these internal designs will be more rugged and aesthetically pleasing than the existing external antennas, the possibility that the external plastic of the chassis will be lossy to achieve shielding will change an internal antenna's operating characteristics substantially. Without proper consideration, this may result in a system with poor performance. Therefore, the complete internal antenna design should incorporate its fundamental operating characteristics as well as specific internal environments. In this paper, two possible internal antenna configurations that include lossy plastic chassis materials are studied using the IE3D simulation package. The numerical results demonstrate the feasibility of these internal antenna designs, achieving broad bandwidth that is required for wireless communication systems.
{"title":"Effects of lossy dielectric material on microstrip antennas","authors":"K. Pan, J. Bernhard, T. Moore","doi":"10.1109/APWC.2000.900137","DOIUrl":"https://doi.org/10.1109/APWC.2000.900137","url":null,"abstract":"Rapid developments in the wireless communication industry require the next generation of portable antenna designs to be internal. While these internal designs will be more rugged and aesthetically pleasing than the existing external antennas, the possibility that the external plastic of the chassis will be lossy to achieve shielding will change an internal antenna's operating characteristics substantially. Without proper consideration, this may result in a system with poor performance. Therefore, the complete internal antenna design should incorporate its fundamental operating characteristics as well as specific internal environments. In this paper, two possible internal antenna configurations that include lossy plastic chassis materials are studied using the IE3D simulation package. The numerical results demonstrate the feasibility of these internal antenna designs, achieving broad bandwidth that is required for wireless communication systems.","PeriodicalId":106689,"journal":{"name":"2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131441802","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 : 1900-01-01DOI: 10.1109/APWC.2000.900127
R.H. Asgary, T. Zargar Ershadi
In response to increasing demand for compact efficient antennas, various cylindrical geometries of dielectric resonator antennas (DRA) are investigated in this paper. These DRA geometries offer significant reduction in volume, making them potential candidates for use in compact applications such as mobile communication handset. Approximate theory of PMC walls developed for predicting resonant radiation frequency of different DRA geometries, gives good agreement with available experimental results. Volume minimization for compact DRA designs is also discussed and a design is proposed for a mobile telephone handset, suitable for the GSM 900 system.
{"title":"Compact dielectric resonator antenna for PCS mobile handsets","authors":"R.H. Asgary, T. Zargar Ershadi","doi":"10.1109/APWC.2000.900127","DOIUrl":"https://doi.org/10.1109/APWC.2000.900127","url":null,"abstract":"In response to increasing demand for compact efficient antennas, various cylindrical geometries of dielectric resonator antennas (DRA) are investigated in this paper. These DRA geometries offer significant reduction in volume, making them potential candidates for use in compact applications such as mobile communication handset. Approximate theory of PMC walls developed for predicting resonant radiation frequency of different DRA geometries, gives good agreement with available experimental results. Volume minimization for compact DRA designs is also discussed and a design is proposed for a mobile telephone handset, suitable for the GSM 900 system.","PeriodicalId":106689,"journal":{"name":"2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114120338","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 : 1900-01-01DOI: 10.1109/APWC.2000.900171
M. Chiang
Interference is the major limiting factor in the performance of wireless cellular systems, introducing an error floor and restricting the number of users. Antenna power control is an important method to mitigate interference, but current ad hoc power control schemes cannot at the same time be optimal, fast and able to accommodate many practical constraints. We formulate the general power control problem for both CDMA and FDMA systems, and transform it into a convex optimization problem with efficient algorithms. For the widely used propagation model, the convex optimization formulation optimizes the quality of service and controls interference in an optimal, fast and versatile way.
{"title":"Convex optimization of antenna power control for wireless cellular systems","authors":"M. Chiang","doi":"10.1109/APWC.2000.900171","DOIUrl":"https://doi.org/10.1109/APWC.2000.900171","url":null,"abstract":"Interference is the major limiting factor in the performance of wireless cellular systems, introducing an error floor and restricting the number of users. Antenna power control is an important method to mitigate interference, but current ad hoc power control schemes cannot at the same time be optimal, fast and able to accommodate many practical constraints. We formulate the general power control problem for both CDMA and FDMA systems, and transform it into a convex optimization problem with efficient algorithms. For the widely used propagation model, the convex optimization formulation optimizes the quality of service and controls interference in an optimal, fast and versatile way.","PeriodicalId":106689,"journal":{"name":"2000 IEEE-APS Conference on Antennas and Propagation for Wireless Communications (Cat. No.00EX380)","volume":"499 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116194962","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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