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2008 18th International Conference Radioelektronika最新文献

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Analysis of a modified Polar Sigma-Delta transmitter architecture for multi-radio applications 多无线电应用中改进的Polar Sigma-Delta发射机结构分析
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542728
M. Peñaloza, Genevieve Baudoin, M. Villegas
{"title":"Analysis of a modified Polar Sigma-Delta transmitter architecture for multi-radio applications","authors":"M. Peñaloza, Genevieve Baudoin, M. Villegas","doi":"10.1109/RADIOELEK.2008.4542728","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542728","url":null,"abstract":"Polar sigma delta architecture has been previously proposed as an universal architecture able to offer multi-radio transmission in a mobile system. Furthermore, it has been validated for mobile WiMax, a very exigent communication standard in terms of envelope magnitude range and channel bandwidth. This paper briefly describes polar sigma delta architecture and proposes some improvements to it, particularly the digital mixing instead of analog mixing. Simulations of the enhanced architecture have been carried out using agilent advanced design system. Results are analyzed and new architecture advantages and drawbacks are pointed out.","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":"129992103","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
An one-to-one integer-number map closed to the continuous pattern 一种闭合于连续模式的一对一整数映射
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542716
V. Sebesta
{"title":"An one-to-one integer-number map closed to the continuous pattern","authors":"V. Sebesta","doi":"10.1109/RADIOELEK.2008.4542716","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542716","url":null,"abstract":"This paper is devoted to the one-to-one integer-number maps derived from the piecewise linear maps. Such digital maps usually produce several periodic sequences. The sequences can be concatenated to the long one. After that the new map can be easy assigned to the long sequence. Such map is generally characterized by local deviations from original shape of the map. In this paper, optimized concatenation with the suppressed deviations is proposed and shown. An integer-number sequence can be transformed to the binary sequence. The proposed concatenated maps were applied onto generating binary spreading sequences for the asynchronous DS/CDMA system. Good correlation properties of these sequences were verified.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"6 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":"132517515","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
Packet scheduling in UMTS UMTS中的包调度
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542700
P. Kejík, S. Hanus
{"title":"Packet scheduling in UMTS","authors":"P. Kejík, S. Hanus","doi":"10.1109/RADIOELEK.2008.4542700","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542700","url":null,"abstract":"This paper deals with the bit rate allocation methods, which are parts of the packet scheduling process. This process, together with access control, congestion control and others, ensures QoS in UMTS. In this paper, a fair throughput packet scheduling algorithm and two versions of fair resources packet scheduling algorithm are described. Simple simulations show a comparison of these three algorithms.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"477 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":"121821859","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
PLL synthesizer with very low discrete spurious 具有极低离散杂散的锁相环合成器
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542718
Z. Brezović, V. Kudják
{"title":"PLL synthesizer with very low discrete spurious","authors":"Z. Brezović, V. Kudják","doi":"10.1109/RADIOELEK.2008.4542718","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542718","url":null,"abstract":"Frequency, transient and noise numerical analysis of a triple active RC notch filters (ARCN filters) are presented in this contribution. ARCN filters analyzed here are used for additional damping of the first unwanted harmonics (1., 2. and 4. ) at the phase detector output voltage. Every additional passive filter inside the PLL very often causes instability due to its too big additional phase shift. On the base numerical simulations results it is possible to design good ARCN filters with small phase shift within active PLL bandwidth. Also the noise analysis and noise optimization of such filters was carried out.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"106 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":"122620661","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
FM demodulation of IQ baseband signals using Kalman filters 调频解调IQ基带信号使用卡尔曼滤波器
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542688
Frank Schadt, Friedemann Mohr, Markus Holzer
{"title":"FM demodulation of IQ baseband signals using Kalman filters","authors":"Frank Schadt, Friedemann Mohr, Markus Holzer","doi":"10.1109/RADIOELEK.2008.4542688","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542688","url":null,"abstract":"Frequency or phase modulated electrical signals arise in multiple applications in communication systems as well as in measurement setups such as interferometry / vibrometry, velocimetry etc. Common demodulation techniques are often based on analog techniques (e.g. a PLL in the RF band) or - after mixing into the base band and generating IQ signals - on digital signal processing algorithms. Two DSP based algorithms for the frequency demodulation of lQ baseband signals will be presented and compared in this paper. One of them is the synthetic heterodyne approach, based on the digital derivation of the arctan of the angle described by the I and Q component. It will be shown, that this algorithm is very sensitive to noise in the baseband signals. The other, more modern algorithm uses a Kalman filter as an \"optimal\" estimator of the instantaneous phase and frequency of the two signals. It will be shown that the Kalman filter shows a drastically improved noise performance.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"52 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":"129254639","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
Uniform rectangular smart antenna with omnidirectional elements - ABF methods, mutual coupling compensation 全向单元均匀矩形智能天线- ABF方法，相互耦合补偿
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542715
S. Savov, V. Vasileva, M. G. Doneva
{"title":"Uniform rectangular smart antenna with omnidirectional elements - ABF methods, mutual coupling compensation","authors":"S. Savov, V. Vasileva, M. G. Doneva","doi":"10.1109/RADIOELEK.2008.4542715","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542715","url":null,"abstract":"In this paper, the adaptive beamforming (ABF) estimation principles of uniform rectangular array (URA) are introduced. An URA is composed of a number of uniformly distributed identical omnidirectional antenna elements. LMS algorithm is applied to antenna beamforming in URA. The effect of mutual coupling between array elements on the performance of smart antenna is investigated. The ABF method produced incorrect results unless it is taken into consideration.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"104 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":"131578407","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
Crystal oscillator with differential amplifier for sensoring 带差分放大器的传感晶体振荡器
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542721
M. Minárik, V. Stofanik, I. Balaz, E. Cocherová
{"title":"Crystal oscillator with differential amplifier for sensoring","authors":"M. Minárik, V. Stofanik, I. Balaz, E. Cocherová","doi":"10.1109/RADIOELEK.2008.4542721","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542721","url":null,"abstract":"The paper deals with a crystal oscillator with differential amplifier based on bipolar junction transistors. The main attention is devoted to the influence of loss resistance of the used piezoelectric resonator to the gain at the corresponding open feedback loop. The derived relation for this gain corresponds with relevant results obtained by means of computer simulations.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"94 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":"131731739","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
Throughwall imaging of the objects scanned by M-sequence UWB radar system m序列超宽带雷达扫描目标的穿壁成像
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542687
M. Aftanas, E. Zaikov, M. Drutarovský, J. Sachs
{"title":"Throughwall imaging of the objects scanned by M-sequence UWB radar system","authors":"M. Aftanas, E. Zaikov, M. Drutarovský, J. Sachs","doi":"10.1109/RADIOELEK.2008.4542687","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542687","url":null,"abstract":"UWB radar system facilitates us to estimate positions and shapes of objects behind the wall. We have made real through the wall SAR measurements with bistatic M-sequence UWB radar system. A metal plate, an aquarium filled with water and a wooden cupboard inside the room with concrete wall have been scanned. The simple and fast algorithm for compensation of different wave velocity inside the wall is described. Measured data are processed with 2-dimensional geometrical based SAR migration in time domain. Conductive materials behind the wall scanned with M-sequence UWB radar system are clearly visible.","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":"115764773","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
Simulation and experimental testing of the DVB-T broadcasting in the SFN networks SFN网络中DVB-T广播的仿真与实验测试
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542691
T. Kratochvil, V. Rícný
{"title":"Simulation and experimental testing of the DVB-T broadcasting in the SFN networks","authors":"T. Kratochvil, V. Rícný","doi":"10.1109/RADIOELEK.2008.4542691","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542691","url":null,"abstract":"This paper deals with the transmission of the digital television signal according to the DVB-T standard in SFN network and fixed reception. The laboratory transmission system for simulated broadcasting based on R&S RF test and measurement equipments is presented. The results of bit-error rates and S/N ration in the channel of simulated DVB-T broadcasting in SFN using two transmitters and SFN echo interference are presented and discussed with the theory.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"118 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":"122615157","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: 5
Object localization using round trip propagation time measurements 使用往返传播时间测量的对象定位
2008 18th International Conference Radioelektronika Pub Date : 2008-04-24 DOI: 10.1109/RADIOELEK.2008.4542689
M. Švecová, D. Kocur, R. Zetik
{"title":"Object localization using round trip propagation time measurements","authors":"M. Švecová, D. Kocur, R. Zetik","doi":"10.1109/RADIOELEK.2008.4542689","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2008.4542689","url":null,"abstract":"The object localization belongs to the basic tasks solved within wireless sensor networks (WSN). It can be shown, that for WSN based on UWB radar systems, localization methods using round trip propagation times can be used with advantages [1]. In this paper we introduce three localization methods of that kind, i.e., a direct calculation, a conventional and weighted least-squares methods and a Taylor series method. It is expected, that these methods can be applied especially for UWB WSN. The properties of the proposed methods will be illustrated by using computer simulations. It will be shown, that Taylor series method can provide the best estimate of object location.","PeriodicalId":162482,"journal":{"name":"2008 18th International Conference Radioelektronika","volume":"53 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":"115604665","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: 33
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