发布求助
文献互助 智能选刊 最新文献

2007 17th International Conference Radioelektronika最新文献

筛选
英文 中文
Through-Wall Propagation Measurements 穿壁传播测量
2007 17th International Conference Radioelektronika Pub Date : 2007-09-01 DOI: 10.1109/ICECOM.2007.4544492
D. Cermak, J. Pidanic, V. Schejbal
{"title":"Through-Wall Propagation Measurements","authors":"D. Cermak, J. Pidanic, V. Schejbal","doi":"10.1109/ICECOM.2007.4544492","DOIUrl":"https://doi.org/10.1109/ICECOM.2007.4544492","url":null,"abstract":"The propagation of signals for ultra wide band (UWB) systems is analyzed. Signals can be substantially affected due to electromagnetic wave propagation through walls or similar obstacles. New experimental results and numerical simulations for frequency band from 4 to 8 GHz are analyzed and compared. That is briefly compared with the time domain experiments, which have been performed using very short pulses. Experiments performed for frequency and time domains demonstrated that the numerical simulations, which are very fast, could be reliable, when suitable wall parameters are used. Some questions concerning electromagnetic compatibility (EMC) are briefly mentioned.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129334375","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
Efficient Design Procedure of Microstatistic Multi-user Detector for Nonlinearly Distorted MC-CDMA 非线性失真MC-CDMA微统计多用户检测器的高效设计方法
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371475
P. Pavelka, J. Krajňák, P. Galajda, D. Kocur
{"title":"Efficient Design Procedure of Microstatistic Multi-user Detector for Nonlinearly Distorted MC-CDMA","authors":"P. Pavelka, J. Krajňák, P. Galajda, D. Kocur","doi":"10.1109/RADIOELEK.2007.371475","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371475","url":null,"abstract":"Multi-carrier code division multiple access (MC-CDMA) is a powerful modulation technique that is being considered in many emerging broadband communication systems. MC-CDMA systems based on OFDM are high sensitive to nonlinear amplification what results in inefficient use of power amplifiers. In a microstatistic MUD (MSF-MUD) has been proposed for performance improvement of MC-CDMA degraded by nonlinear amplifiers. In this paper, a new efficient design procedure of MSF-MUD for nonlinearly distorted symbols of MC-CDMA based on M-symbol QAM modulation is proposed. This method is based on the analysis and change tracking of the M-symbol QAM signal constellations of non-distorted and nonlinearly distorted MC-CDMA symbols by using a training sequence. The results obtained in this paper confirm, that the MSF-MUD clearly overcomes a linear MUD at the outlined scenario whereas MSF-MUD designed by the new method described in this paper is able to provide almost the same performance than that of optimum MSF-MUD.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115453739","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
A Flexible Oscillator for Measurement of Varactor-Tuned Resonators 用于变容管调谐谐振器测量的柔性振荡器
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371430
V. Kudják, Z. Brezović
{"title":"A Flexible Oscillator for Measurement of Varactor-Tuned Resonators","authors":"V. Kudják, Z. Brezović","doi":"10.1109/RADIOELEK.2007.371430","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371430","url":null,"abstract":"A new version of RF oscillator with high linearity (THD<1%) and wide zone of adjusting its amplitude (min. 40 dB) is presented in this contribution. Oscillator is designed for single and quickly measurement of non-linearity effects in varactor-tuned LC resonators, and it is usable in frequency band from LF up to 50 MHz. Active part of the oscillator consist of high-speed OA of type VFB (voltage feedback), or CVB (current feedback) and resistive feedback circuit. Herein are presented analytical relationships derived for parameters input characteristics for both VFB OA and CVB OA respectively. OA with positive feedback has in the centre its input characteristics negative resistance, which give the possibility to compensate losses in parallel LC resonator. For simple and effective control of the oscillation amplitude is used backward biased diode detector with control voltage. In contributions are also presented measured parameters of the oscillator and there are given some examples of measured tuning characteristics with varactors.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127136375","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
Modeling of Ultra-wideband Coplanar Patch Antennas 超宽带共面贴片天线建模
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371679
J. Jilková, Z. Lukeš, Z. Raida
{"title":"Modeling of Ultra-wideband Coplanar Patch Antennas","authors":"J. Jilková, Z. Lukeš, Z. Raida","doi":"10.1109/RADIOELEK.2007.371679","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371679","url":null,"abstract":"This paper deals with modeling of the ultra-wideband planar antennas with coplanar feeding in the commercial available programs. After a brief summary of the basic principles of high-frequency structures modeling, a specific design of wideband antennas on two different substrates is shown. The antennas are modeled in CST Microwave Studio and Zeland IE3D. Simulation results are compared to measured data.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"2012 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127403777","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
Modified Microstrip Ring Applicator for Superficial Hyperthermia 用于表面热疗的改良微带环涂抹器
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371706
T. Drizdal, P. Togni, J. Vrba
{"title":"Modified Microstrip Ring Applicator for Superficial Hyperthermia","authors":"T. Drizdal, P. Togni, J. Vrba","doi":"10.1109/RADIOELEK.2007.371706","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371706","url":null,"abstract":"Nowadays hyperthermia is one of the possible cancer treatment method used in combination with classical therapies in several countries in the world. In this article we described the designed and optimization of a microstrip type applicator for the treatment of superficial diseases. The optimization was made in order to obtain a more uniform SAR distribution, which is one of the requirements to achieve a good thermotherapy treatment.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125922721","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
Investigations of Scattering from Arbitrary Configuration of Elliptical Obstacles 椭圆障碍物任意构型散射的研究
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371684
A. Kusiek, P. Kowalczyk, J. Mazur
{"title":"Investigations of Scattering from Arbitrary Configuration of Elliptical Obstacles","authors":"A. Kusiek, P. Kowalczyk, J. Mazur","doi":"10.1109/RADIOELEK.2007.371684","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371684","url":null,"abstract":"In this paper the new technique of analysis of an arbitrary configuration of metallic elliptical objects is presented. The proposed method is based on T-matrix representation of elliptical object in cylindrical coordinates system. The total scattered field is computed with usage iterative scattering procedure (ISP). The numerical results are compared with once obtained from commercial software and a very good agreement was achieved.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115578676","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
Image Processing with Invertible Rapid Transform 可逆快速变换图像处理
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371657
J. Turán, Ľ. Ovseník, S. Marchevsky
{"title":"Image Processing with Invertible Rapid Transform","authors":"J. Turán, Ľ. Ovseník, S. Marchevsky","doi":"10.1109/RADIOELEK.2007.371657","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371657","url":null,"abstract":"The proposed paper deals with image processing using invertible rapid transform (IRT). A software tool for image processing using IRT is presented.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114442324","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
A Real Time Audio Fingerprinting System for Advertisement Tracking and Reporting in FM Radio 一种用于调频广播广告跟踪与报告的实时音频指纹系统
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371456
J. Cerquides
{"title":"A Real Time Audio Fingerprinting System for Advertisement Tracking and Reporting in FM Radio","authors":"J. Cerquides","doi":"10.1109/RADIOELEK.2007.371456","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371456","url":null,"abstract":"In this paper we present a system designed to detect, identify and track commercial segments transmitted by a radio station. The program is entirely written in Visual C++ and uses state of the art audio fingerprinting technologies to achieve a great performance, being able to operate several times faster than real time while keeping a moderate computational load.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"47 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116823099","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
Log-polar Mapping in Robust Digital Image Watermarking 鲁棒数字图像水印中的对数极坐标映射
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371491
R. Ridzon, D. Levický
{"title":"Log-polar Mapping in Robust Digital Image Watermarking","authors":"R. Ridzon, D. Levický","doi":"10.1109/RADIOELEK.2007.371491","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371491","url":null,"abstract":"The geometrical attacks are still open problem for many digital watermarking algorithms used in present time. Most of geometrical attacks can be described by using affine transforms. This article deals with digital watermarking in images robust against the affine transformations. The new approach to improve robustness against geometrical attacks is presented. The discrete Fourier transform and log-polar mapping is used for watermark embedding and for watermark detection. Some attacks against the embedded watermarks are performed and the results are given.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129580514","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: 7
Mobil FSO Activities in Europe and Fading Mitigation Approaches 欧洲的移动FSO活动和减缓衰落的方法
2007 17th International Conference Radioelektronika Pub Date : 2007-04-24 DOI: 10.1109/RADIOELEK.2007.371452
H. Henniger, B. Epple, D. Giggenbach
{"title":"Mobil FSO Activities in Europe and Fading Mitigation Approaches","authors":"H. Henniger, B. Epple, D. Giggenbach","doi":"10.1109/RADIOELEK.2007.371452","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371452","url":null,"abstract":"The increasing emergence of data services for mobile applications requires high-speed communication technologies. To this end, free-space optical (FSO) communications technology has the potential to outperform radio frequency (RF) systems. Within the last years, the German Aerospace Center (DLR) has performed several demonstrations of mobile FSO systems. A brief overview of these activities is given in this paper. Mobil FSO mainly suffers from relatively long link outages, produced by temporary obscured laser-beams, pointing-and tracking-errors or deep signal-fades caused by index of refraction turbulence effects. Error correction and retransmission techniques for fading mitigation are discussed in this paper. Comparison of FEC and protocol based error correction for mobile FSO transmission is presented.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128705466","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: 19
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：481959085
Book学术官方微信