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2009 19th International Conference Radioelektronika最新文献

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TCP for wireless network 无线网络TCP协议
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158785
Pavol Kocan, J. Mochnáč, S. Marchevsky
{"title":"TCP for wireless network","authors":"Pavol Kocan, J. Mochnáč, S. Marchevsky","doi":"10.1109/RADIOELEK.2009.5158785","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158785","url":null,"abstract":"Video transmitted over error prone channel is always subject to packet losses. One way, how to deal with this problem is using connection-oriented, end-to-end reliable protocol. In this paper we focused on several implementations of transmission control protocol, which fulfill the conditions for reliable delivery of information. Tahoe, Reno and New Reno implementation supported by TCP are part of congestion avoidance mechanisms of the protocol suite. The main difference between them is mechanism of detection and reaction on the packet loss. Thus we have tried to evaluate their performance.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131125064","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
Single phase electricity meter with PLC modem 带PLC调制解调器的单相电能表
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158744
P. Fuchs, M. Majchrak, Filip Krajcovic, Martin Krajmer
{"title":"Single phase electricity meter with PLC modem","authors":"P. Fuchs, M. Majchrak, Filip Krajcovic, Martin Krajmer","doi":"10.1109/RADIOELEK.2009.5158744","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158744","url":null,"abstract":"An overview of a single phase electronic electricity meter using the Texas Instruments mixed-signal processor MSP430FE42x is given. Some aspects of the Power Line Communication (PLC), specific problems of implementation PLC modem into electronic electricity meter and basic topology of automated meter reading are discussed. Interface between PLC modem and electronic electricity meter was designed and experimentally tested.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130062673","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
Simulation of blind adaptive DS-CDMA LMS detector 盲自适应DS-CDMA LMS检测器仿真
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158769
J. Šimša
{"title":"Simulation of blind adaptive DS-CDMA LMS detector","authors":"J. Šimša","doi":"10.1109/RADIOELEK.2009.5158769","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158769","url":null,"abstract":"The contribution is focused on simulation of stochastic adaptive detector of a direct-sequence (DS) spread spectrum signal as a member of code-division multiplex/multiple access (CDM/CDMA). Stochastic gradient-based algorithms, referred to as least mean square (LMS) algorithms have been simulated. This algorithm approximates the autocorrelation function of a stationary input signal by its instantaneous value (stochastic approximation). Some results of simulation are described in the contribution as examples.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127457148","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
Design optimization of the power transformer and inductor in the switch-mode power supplies 开关电源中电源变压器和电感的优化设计
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158726
Peter Sastinsky, Matus Jendruch
{"title":"Design optimization of the power transformer and inductor in the switch-mode power supplies","authors":"Peter Sastinsky, Matus Jendruch","doi":"10.1109/RADIOELEK.2009.5158726","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158726","url":null,"abstract":"This paper discusses the loss in the transformer and the inductor in applications of the DC/DC converters. The analysis of this loss due to eddy currents in windings conductor of these transformers and inductors is made. This eddy current loss is caused particularly by two effects: skin effect and proximity effect, which are also part of this text. The design optimization of these windings to minimize eddy current loss is made.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"252 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129040091","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
Multistage Wiener filter for DS - CDMA detection 用于DS - CDMA检测的多级维纳滤波器
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158728
J. Šimša
{"title":"Multistage Wiener filter for DS - CDMA detection","authors":"J. Šimša","doi":"10.1109/RADIOELEK.2009.5158728","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158728","url":null,"abstract":"The contribution is oriented towards the promising and intensively studied realization of Wiener filter as the multistage structure. This approach avoids evaluation of the inverse of an autocorrelation matrix of the response of chip matched filter to an input signal and it enables an approximation of a multistage filter by curtailment the number of stages of this multistage Wiener filter. The contribution summarizes alternatives of processing by the individual stages and outlines the direction of the further activity.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122841511","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
Electronically-controlled multifunctional current mode filter based on commercially available current conveyors and buffers 电子控制的多功能电流模式滤波器基于市售电流输送机和缓冲器
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158778
R. Sotner, J. Slezák, T. Dostál
{"title":"Electronically-controlled multifunctional current mode filter based on commercially available current conveyors and buffers","authors":"R. Sotner, J. Slezák, T. Dostál","doi":"10.1109/RADIOELEK.2009.5158778","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158778","url":null,"abstract":"Application of commercially available modern functional blocks used for design of analog filters using integrator synthesis method is discussed in this paper. One example of all possible structures of 2nd-order multifunctional filters with current conveyors and followers is chosen and designed. Attention is paid to electronic control of parameters of the filter, sensitivity analysis and computer simulation using OrCAD.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114838781","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
Bandwidth comparison of various types coplanar microwave ring hybrids 不同类型共面微波环杂化的带宽比较
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158797
P. Orság, J. Svac̆ina
{"title":"Bandwidth comparison of various types coplanar microwave ring hybrids","authors":"P. Orság, J. Svac̆ina","doi":"10.1109/RADIOELEK.2009.5158797","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158797","url":null,"abstract":"The paper deals with some parameters of microwave ring hybrids mainly from their attainable frequency bandwidth. Selected parameters are especially coupling (C), insertion loss (IL), isolation (I), input VSWR and corresponding bandwidth. We investigated various planar ring hybrids realized in microstrip, coplanar waveguide (CPW), conductor-backed coplanar waveguide (CB-CPW), and CPW-slotline technology, respectively. All couplers are designed for center frequency of 3 GHz and 3 dB coupling. Various hybrids were simulated and compared with measured experimental results.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124511949","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
Dependence of the RF field absorption on the human body dimensions 射频场吸收与人体尺寸的关系
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158792
E. Cocherová, J. Surda, J. Púc̆ik, V. Stofanik
{"title":"Dependence of the RF field absorption on the human body dimensions","authors":"E. Cocherová, J. Surda, J. Púc̆ik, V. Stofanik","doi":"10.1109/RADIOELEK.2009.5158792","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158792","url":null,"abstract":"In this paper, the dependence of radio-frequency (RF) field absorption on human body dimensions is investigated. The resonance properties of an ellipsoidal homogeneous human model have been investigated in frequency range from 10 MHz to 500 MHz with assistance of CST Microwave Studio program environment. In the article, the simulation of RF field absorption in the ellipsoidal body model has been performed for three various body heights, as well as three widths for a given body height.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130397275","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
Robust frame by frame video watermarking resistant against collusion attacks 鲁棒的逐帧视频水印，抗合谋攻击
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158760
Tomáš Kanócz, T. Tokar, D. Levický
{"title":"Robust frame by frame video watermarking resistant against collusion attacks","authors":"Tomáš Kanócz, T. Tokar, D. Levický","doi":"10.1109/RADIOELEK.2009.5158760","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158760","url":null,"abstract":"Many frame by frame video watermarking methods where proposed, but only a few of them are robust against collusion attacks. These attacks can be easily conducted and their result is an unmarked video. In this paper a frame by frame watermarking method is proposed, which is robust against unintentional attacks, attacks of frame dropping, frame swapping and collusion attacks. Experimental results are also included to verify the robustness of the proposed method against some of the above mentioned attacks.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"41 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120867545","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: 11
Ethernet bridge for FSO links 用于FSO链路的以太网桥接
2009 19th International Conference Radioelektronika Pub Date : 2009-04-22 DOI: 10.1109/RADIOELEK.2009.5158741
M. Kubícek, Z. Kolka
{"title":"Ethernet bridge for FSO links","authors":"M. Kubícek, Z. Kolka","doi":"10.1109/RADIOELEK.2009.5158741","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2009.5158741","url":null,"abstract":"The paper deals with a bridge for atmospheric Free-Space Optical links. The atmospheric turbulence causes fades whose duration is typically in the order of tens of milliseconds, which results in the loss of hundreds or thousands of packets. The loss is misinterpreted by the TCP protocol as network congestion and leads to throttling the sender transmission data rate to a fraction of real channel capacity. The proposed Ethernet-to-FSO bridge uses ARQ procedures on the FSO channel to mitigate the packet loss on the link layer. The bridge is based on Xilinx Virtex-5 FPGA with additional memory for buffers. A special link protocol for the FSO path has been designed. FSO frames can carry complete Ethernet frames without fragmentation.","PeriodicalId":285174,"journal":{"name":"2009 19th International Conference Radioelektronika","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134057063","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
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