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2008 18th International Conference Radioelektronika最新文献

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Angle modulation indices measurement in the presence of amplitude modulation 在存在调幅的情况下测量角度调制指标
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542720
S. Matejka
{"title":"Angle modulation indices measurement in the presence of amplitude modulation","authors":"S. Matejka","doi":"10.1109/RADIOELEK.2008.4542720","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542720","url":null,"abstract":"This paper presents an automated measurement of the phase/frequency indices of angle modulation in the frequency domain on condition that a signal source is simultaneously angle and amplitude modulated by the same phase shifted harmonic signals. In the first part of this paper, we propose mathematical model of such modulated signals. Then we investigate the spectrum of signal and discuss some basic properties of such modulated signals, where we restrict ourselves only to a weak amplitude modulation with modulation depth smaller than 100 %. The final section is devoted to the signal parameters derivation techniques based on the power spectrum measurement and non-linear least squares iteration method. The effect of power spectrum measurement errors is also pointed out and a comparison between Bessel null method and proposed technique is presented.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131616947","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
MC-CDMA performance analysis for different spreading codes at HPA Saleh model HPA Saleh模型下不同扩频码的MC-CDMA性能分析
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542697
P. Drotár, J. Gazda, D. Kocur, P. Galajda
{"title":"MC-CDMA performance analysis for different spreading codes at HPA Saleh model","authors":"P. Drotár, J. Gazda, D. Kocur, P. Galajda","doi":"10.1109/RADIOELEK.2008.4542697","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542697","url":null,"abstract":"Multi-carrier code division multiple access (MC- CDMA) is a powerfull modulation technique that is being considered in many emerging broadband communication systems. However the high peak to average power ratio (PAPR) of the MC-CDMA signal, a special drawback of multicarrier transmission, has limited its wider aplication due to inefficient use of power amplifiers. PAPR strongly depends on particular spreading sequences considered for transmission. Therefore, the performance analysis of uplink MC-CDMA for different spreading sequences and for different receivers in the presence of Saleh model of high power amplifier (HPA) is presented. The results of our analysies show that the aplication of Golay codes in conduction with micro statistic multi-user receiver (MSF-MUD) provide significant better result as the other investigated spreading sequences and receivers.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124028533","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: 13
The iterative detection network based recovery of black & white pictures shot by camera (implementation and complexity reduction issue) 基于迭代检测网络的相机黑白图像恢复(实现与降复杂度问题)
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542730
D. Kekrt, M. Klima
{"title":"The iterative detection network based recovery of black & white pictures shot by camera (implementation and complexity reduction issue)","authors":"D. Kekrt, M. Klima","doi":"10.1109/RADIOELEK.2008.4542730","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542730","url":null,"abstract":"The paper deals with a defocusing and Poisson (shot) noise elimination out of black & white pictures captured by a CCD (CMOS) camera with imperfectly adjusted lens. For purposes of this image recovery we can use the MAP criterion based iterative detection network (IDN) containing a number of mutually concatenated elementary function blocks so-called soft inversions (SISOs). This cellular structure makes IDN suboptimal but also numerically very simple and practically applicable in contrast to unviable optimal (single-stage) MAP detector. Firstly we focus closer on SISO entities and consequently on the creation of entire IDN. There will be introduced two different forms of reconstruction system (distributed IDN) together with complexity reduction possibilities and example of the image reconstruction by one of them.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124468510","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
One new architecture of fractional frequency synthesizer 分数频率合成器的一种新结构
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542709
M. Stork
{"title":"One new architecture of fractional frequency synthesizer","authors":"M. Stork","doi":"10.1109/RADIOELEK.2008.4542709","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542709","url":null,"abstract":"This paper describes a new architecture of a digital fractional frequency synthesizer based on generators, counters and a register. The technique described here is much simpler then other method e.g. SigmaDelta fractional-N frequency synthesizers or direct digital synthesis. Presented synthesizer is the most suitable for the design of VLSI architectures or for programmable Large Scale Integration (or in-system programmable Large Scale Integration). On the other hand, this synthesizer has a disadvantage in low output frequency, but this can be overcome by using this synthesizer together with phase locked loop.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125578514","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
Symbolic modeling of switched DC-DC converters 开关DC-DC变换器的符号建模
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542726
J. Kovar, Z. Kolka
{"title":"Symbolic modeling of switched DC-DC converters","authors":"J. Kovar, Z. Kolka","doi":"10.1109/RADIOELEK.2008.4542726","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542726","url":null,"abstract":"The paper deals with symbolic analysis of switched DC-DC converters operating in the continuous conducting node (CCM). The method is based on the technique of generalized average model of PWM switch. A procedure for obtaining line-to-output and control-to-output transfer functions for all basic topologies in fully symbolic form using the SNAP programme is shown. An example of the analysis of a boost converter is presented.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131511587","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
Estimating PSNR without reference for real H.264/AVC sequence intra frames 估计无参考的真实H.264/AVC序列帧内的PSNR
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542692
M. Slanina, V. Rícný
{"title":"Estimating PSNR without reference for real H.264/AVC sequence intra frames","authors":"M. Slanina, V. Rícný","doi":"10.1109/RADIOELEK.2008.4542692","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542692","url":null,"abstract":"The paper describes a novel metric for video quality measurement. The metric is capable of estimating peak signal-to-noise ratio (PSNR) values of pictures in compressed bit streams conforming to the H.264/AVC standard. It is designed and has been tested for intra predicted pictures with varying encoder settings. The metric uses an artificial neural network to estimate PSNR examining the compressed bit stream only. In other words, we do not need to decode the actual pixels within the pictures being evaluated.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132388460","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 image watermarking based on the synchronization template 基于同步模板的鲁棒图像水印
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542693
R. Ridzon, D. Levický
{"title":"Robust image watermarking based on the synchronization template","authors":"R. Ridzon, D. Levický","doi":"10.1109/RADIOELEK.2008.4542693","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542693","url":null,"abstract":"Digital watermarking is a potential effective method for authentication and ownership rights protection. The digital watermark is hidden information added into the multimedia. This paper presents robust digital watermarking in images. One robust digital watermarking based on the synchronization template is presented and some experimental results are presented too.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122041134","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
The optimized concentrator placement problem solution using GIS 利用GIS优化选矿厂选址问题
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542702
J. Petrek
{"title":"The optimized concentrator placement problem solution using GIS","authors":"J. Petrek","doi":"10.1109/RADIOELEK.2008.4542702","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542702","url":null,"abstract":"The goal of this paper is to introduce an algorithm for optimized repeater station placement using a digital terrain profile taken from the GIS (Geographic information system) database of Slovak Republic. Not only are the terrain profile and the radio link range included into consideration, but also the power source availability. The algorithm can be used to design a radio-communication access network of a UMTS/GSM mobile provider or any network using radio links. The basic optimization criterion is the network cost. Secondary also network reliability is taken into account. So a cost effective and computer supported optimized design of radio network topology became possible.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129569256","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
Improving of UHF RFID pattern steering by phased antenna array 相控阵天线对超高频RFID方向控制的改进
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542719
B. Krnac, J. Haring
{"title":"Improving of UHF RFID pattern steering by phased antenna array","authors":"B. Krnac, J. Haring","doi":"10.1109/RADIOELEK.2008.4542719","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542719","url":null,"abstract":"Radio Frequency Identification (RFID) is very potential technology suitable for various areas of applications. From utilization in the supply chain thought traffic application to livestock tracking and person's identification and verification. Current passive RFID UHF tags are non-directional and have general radiation pattern characteristic. By managing the direction of the pattern we can gain more time required for accomplishment sophisticated functions of IC and the energetic feed increases as well. These facilities make RFID technology suitable for more advanced applications as position determination and localization in wireless ad-hoc networks. This article deals with passive open-ended two strips UHF tag reading range and possibilities of enhancing this range by utilization of intelligent antenna set in RFID tag.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128677101","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
Analysis of a PLL based frequency synthesizer using switched loop bandwidth for Mobile WiMAX 基于锁相环的频率合成器用于移动WiMAX的开关环路带宽分析
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542708
V. Valenta, M. Villegas, G. Baudoin
{"title":"Analysis of a PLL based frequency synthesizer using switched loop bandwidth for Mobile WiMAX","authors":"V. Valenta, M. Villegas, G. Baudoin","doi":"10.1109/RADIOELEK.2008.4542708","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542708","url":null,"abstract":"This paper is focused on design aspects of a fractional-N PLL (phase locked loop) based frequency synthesizer proposed for the mobile WiMAX (worldwide interoperability for mobile access) standard. Requirements in terms of phase noise, settling time, frequency resolution and frequency of operation for WiMAX frequency synthesizer are presented. Furthermore, a high-speed CP (Charge Pump) PLL based synthesizer with a switched loop bandwidth is proposed and simulated. It has a 32 MHz reference frequency and a 50 kHz loop bandwidth with frequency raster of 125 kHz and 14 mus settling time.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125503851","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: 16
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