Pub Date : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371691
L. Mospan
A plane wave scattering at a screen periodically perforated by the shorted ring slots is considered. A shorted ring slot is formed by an annular aperture shorted by a pair of metal bridges. Polarization sensitive transmission of the incident TE00-mode is discussed. In contrast to a conventional design, such a transmission occurs at the wavelength which is closely equal to a half of the ring slot circumference. An electromagnetic coupling by means of a non dominant mode of the shorted ring slot makes it possible.
{"title":"Plane Wave Scatteringat a Shorted Ring Frequency Selective Surfacewith Non Dominant Mode Coupling","authors":"L. Mospan","doi":"10.1109/RADIOELEK.2007.371691","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371691","url":null,"abstract":"A plane wave scattering at a screen periodically perforated by the shorted ring slots is considered. A shorted ring slot is formed by an annular aperture shorted by a pair of metal bridges. Polarization sensitive transmission of the incident TE00-mode is discussed. In contrast to a conventional design, such a transmission occurs at the wavelength which is closely equal to a half of the ring slot circumference. An electromagnetic coupling by means of a non dominant mode of the shorted ring slot makes it possible.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"121 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":"127283786","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371479
M. Kukucka
The knowledge and experiences can be collected during study of various mathematical models and accesses and lead the diagnostic system creator to using of fuzzy Petri nets as a representation of the knowledge base rules for experimental diagnostic system creation. I decided for the deductive access system. Information was collected from the experienced expert of thyroid diagnostics. Standardized was number and verbal expression of output diagnostic decisions ( diagnosis recommendation ) which would be offered by the system. Then set of seven basic diagnostic decisions was established. When the measure of detachment of decision and the general limpidity of the whole system increases using the expert system then the endeavour lead to experimental diagnostic system creation. Used was the fuzzy logic. Finally a brief view into "Fuzzy system" environment for diagnostic system creation with a part of knowledge base represented by the fuzzy rules was described and the knowledge base graphical representation inform of fuzzy Petri net and its diagnostic evaluation.
{"title":"Design of Experimental Fuzzy Diagnostic System","authors":"M. Kukucka","doi":"10.1109/RADIOELEK.2007.371479","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371479","url":null,"abstract":"The knowledge and experiences can be collected during study of various mathematical models and accesses and lead the diagnostic system creator to using of fuzzy Petri nets as a representation of the knowledge base rules for experimental diagnostic system creation. I decided for the deductive access system. Information was collected from the experienced expert of thyroid diagnostics. Standardized was number and verbal expression of output diagnostic decisions ( diagnosis recommendation ) which would be offered by the system. Then set of seven basic diagnostic decisions was established. When the measure of detachment of decision and the general limpidity of the whole system increases using the expert system then the endeavour lead to experimental diagnostic system creation. Used was the fuzzy logic. Finally a brief view into \"Fuzzy system\" environment for diagnostic system creation with a part of knowledge base represented by the fuzzy rules was described and the knowledge base graphical representation inform of fuzzy Petri net and its diagnostic evaluation.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"139 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":"127479408","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371466
J. Hrubeš, J. Kozumplík
This paper deals with automatic image thresholding based on fuzzy entropy definition. It is used to select the fuzzy region of membership function so that an image is able to be transformed into fuzzy domain with maximum fuzzy entropy. Then we are able to divide the fuzzy region and establish the thresholds. For selection of optimal membership function is used genetic algorithm.
{"title":"Automatic Optimal Thresholding of Image Data","authors":"J. Hrubeš, J. Kozumplík","doi":"10.1109/RADIOELEK.2007.371466","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371466","url":null,"abstract":"This paper deals with automatic image thresholding based on fuzzy entropy definition. It is used to select the fuzzy region of membership function so that an image is able to be transformed into fuzzy domain with maximum fuzzy entropy. Then we are able to divide the fuzzy region and establish the thresholds. For selection of optimal membership function is used genetic algorithm.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"34 3 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":"121725874","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371443
T. Sutory, Z. Kolka
The paper deals with nonlinear on-chip capacitor characterization. A modification of CBCM (charge-based capacitance measurements) has been proposed. The CBCM method was originally developed for linear interconnect-capacitance measurements. The proposed modification uses two DC swept sources to measure the whole nonlinear Q-v characteristic in both polarities without the necessity to switch the measured object. The main advantage of the method is high resolution although it is based on equipment found in any average laboratory. A test-chip implementing the method was designed and manufactured in 0.35 mum CMOS process. Verification against known capacitances proved the method correctness and accuracy. The test-chip was successfully used for MOSFET gate-capacitance characterization.
本文研究了片上电容的非线性特性。提出了一种基于电荷的电容测量方法。CBCM方法最初是为线性互连电容测量而开发的。提出的改进方法使用两个直流扫频源来测量两个极性下的整个非线性Q-v特性，而无需切换被测对象。该方法的主要优点是高分辨率，尽管它是基于在任何普通实验室中发现的设备。采用0.35 μ m CMOS工艺设计并制作了实现该方法的测试芯片。对已知电容进行了验证，证明了方法的正确性和准确性。该测试芯片已成功用于MOSFET栅极电容表征。
{"title":"Characterization of Nonlinear On-Chip Capacitors","authors":"T. Sutory, Z. Kolka","doi":"10.1109/RADIOELEK.2007.371443","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371443","url":null,"abstract":"The paper deals with nonlinear on-chip capacitor characterization. A modification of CBCM (charge-based capacitance measurements) has been proposed. The CBCM method was originally developed for linear interconnect-capacitance measurements. The proposed modification uses two DC swept sources to measure the whole nonlinear Q-v characteristic in both polarities without the necessity to switch the measured object. The main advantage of the method is high resolution although it is based on equipment found in any average laboratory. A test-chip implementing the method was designed and manufactured in 0.35 mum CMOS process. Verification against known capacitances proved the method correctness and accuracy. The test-chip was successfully used for MOSFET gate-capacitance characterization.","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":"130931338","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371427
J. Kolouch
The possibility of synthesis of combinational divider for unsigned integer numbers in FPGA devices is considered with respect to recent technology development. Three VHDL models are discussed, and corresponding synthesis and implementation results - resource consumption and propagation delay, together with the bit width limitation, are compared.
{"title":"Combinational Divider in FPGA","authors":"J. Kolouch","doi":"10.1109/RADIOELEK.2007.371427","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371427","url":null,"abstract":"The possibility of synthesis of combinational divider for unsigned integer numbers in FPGA devices is considered with respect to recent technology development. Three VHDL models are discussed, and corresponding synthesis and implementation results - resource consumption and propagation delay, together with the bit width limitation, are compared.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"31 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":"128382161","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371688
Z. Lukeš, J. Jilková, Z. Raida
The presented text deals with design of the modification of the low-profile dipole planar inverted cone antenna (LPdiPICA) which is in the text originally modified. In the literature, the original antenna is fed symmetrically. In our case, the symmetrical feeding to coplanar feeding is changed. The motive of the antenna was designed and optimized in Zeland IE3D full-wave EM solver. The parameters S was analyzed in frequency range from 1 GHz to 10 GHz. After design of the antenna, the results were compared with another EM solver (CST MW Studio) and with values of measurements in the frequency range from 1 GHz to 50 GHz.
{"title":"Coplanar Ultra-Wideband Modification of the Low-Profile Inverted Cone Antenna","authors":"Z. Lukeš, J. Jilková, Z. Raida","doi":"10.1109/RADIOELEK.2007.371688","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371688","url":null,"abstract":"The presented text deals with design of the modification of the low-profile dipole planar inverted cone antenna (LPdiPICA) which is in the text originally modified. In the literature, the original antenna is fed symmetrically. In our case, the symmetrical feeding to coplanar feeding is changed. The motive of the antenna was designed and optimized in Zeland IE3D full-wave EM solver. The parameters S was analyzed in frequency range from 1 GHz to 10 GHz. After design of the antenna, the results were compared with another EM solver (CST MW Studio) and with values of measurements in the frequency range from 1 GHz to 50 GHz.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"41 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":"132829851","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371484
J. Mikulka, S. Hanus
This paper deals with a Matlab-simulink simulation of IEEE 802.11b physical Layer specification. There was made a Matlab Simulink program that simulates 4 data rates (1, 2, 5.5, 11 Mbps) specified in the 802.1 lb standard. Program includes Barker coding implementation for lower data rates (1,2 Mbps) and CCK (complementary code keying) for higher data rates providing 5.5 and 11 Mbps. All data rates are using DSSS (direct sequence spread spectrum). Basic description of the program and results in graphical and numerical form are introduced as a BER to Eb/NO dependence.
{"title":"CCK and Barker Coding Implementation in IEEE 802.11b Standard","authors":"J. Mikulka, S. Hanus","doi":"10.1109/RADIOELEK.2007.371484","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371484","url":null,"abstract":"This paper deals with a Matlab-simulink simulation of IEEE 802.11b physical Layer specification. There was made a Matlab Simulink program that simulates 4 data rates (1, 2, 5.5, 11 Mbps) specified in the 802.1 lb standard. Program includes Barker coding implementation for lower data rates (1,2 Mbps) and CCK (complementary code keying) for higher data rates providing 5.5 and 11 Mbps. All data rates are using DSSS (direct sequence spread spectrum). Basic description of the program and results in graphical and numerical form are introduced as a BER to Eb/NO dependence.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"60 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":"134328594","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371460
T. Fryza
This contribution presents a basic structure of video compression coder based on Three Dimensional Discrete Cosine Transform (3D DCT). Mainly, this paper deals with a optimal method of forming the 3D DCT frequency coefficients into output bit stream. It is well known the number of non zero frequency coefficients depends on the video sequence character. The sequence with a slow motion evokes a low number of coefficients and vice versa the dynamic sequence produces a high number of frequency coefficients, thus the compress ratio of an encoded sequence tends to be low. It could be proved the compress properties of 3D DCT encoder do not depends only on scene character but can be improved by the entropy coder and by the way how the coefficients are scanned. The scanning order optimized for the 3D DCT and a content of the dictionary for Huffman coder is proposed in this paper.
{"title":"Properties of Entropy Coding for 3D DCT Video Compression Method","authors":"T. Fryza","doi":"10.1109/RADIOELEK.2007.371460","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371460","url":null,"abstract":"This contribution presents a basic structure of video compression coder based on Three Dimensional Discrete Cosine Transform (3D DCT). Mainly, this paper deals with a optimal method of forming the 3D DCT frequency coefficients into output bit stream. It is well known the number of non zero frequency coefficients depends on the video sequence character. The sequence with a slow motion evokes a low number of coefficients and vice versa the dynamic sequence produces a high number of frequency coefficients, thus the compress ratio of an encoded sequence tends to be low. It could be proved the compress properties of 3D DCT encoder do not depends only on scene character but can be improved by the entropy coder and by the way how the coefficients are scanned. The scanning order optimized for the 3D DCT and a content of the dictionary for Huffman coder is proposed in this paper.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"92 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":"132441550","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371696
M. Pokorn, J. Horák
The paper briefly uncovers techniques used for a design of compact planar antennas in order to achieve wideband and multi-band capability. The main topic is aimed to the multi-objective optimization using genetic algorithms. Quarter-wavelength planar inverted-F antenna (PIFA) using slot and shorted parasitic patches is chosen to cover GSM900, GSM1800 and ISM2400 bands. The antenna was developed in an electromagnetic simulation and optimization package IE3D by Zeland Software. Global multi-objective optimization is provided by the cooperation between MATLAB and IE 3D. Binary genetic algorithm and composite objective function are used to tune this antenna. Impedance match and direction of maximum gain are desired parameters to improve.
{"title":"Design and Global Multi-Objective Optimization of Planar Tri-Band Antenna","authors":"M. Pokorn, J. Horák","doi":"10.1109/RADIOELEK.2007.371696","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371696","url":null,"abstract":"The paper briefly uncovers techniques used for a design of compact planar antennas in order to achieve wideband and multi-band capability. The main topic is aimed to the multi-objective optimization using genetic algorithms. Quarter-wavelength planar inverted-F antenna (PIFA) using slot and shorted parasitic patches is chosen to cover GSM900, GSM1800 and ISM2400 bands. The antenna was developed in an electromagnetic simulation and optimization package IE3D by Zeland Software. Global multi-objective optimization is provided by the cooperation between MATLAB and IE 3D. Binary genetic algorithm and composite objective function are used to tune this antenna. Impedance match and direction of maximum gain are desired parameters to improve.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"45 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":"116074239","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 : 2007-04-24DOI: 10.1109/RADIOELEK.2007.371485
N. Ouddane, P. Kromer, V. Snás̃el
Since them appearance in 1993, the turbo codes gives first best approaching to the Shannon limit, and a new direction for the channel encoding field, especially since they were adopted for multiple norms of telecommunications, such as deeper communication. To obtain an excellent performance it is necessary to design robust turbo code interleaver. We are investigating genetic algorithms as a promising optimization method to find good performing interleaver for the larger frame sizes. In this paper, we present our work, compare with several previous approaches and present some experimental results.
{"title":"Interleaver Design for Parallel Convolutive Turbo Codes by the Genetic Algorithms","authors":"N. Ouddane, P. Kromer, V. Snás̃el","doi":"10.1109/RADIOELEK.2007.371485","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2007.371485","url":null,"abstract":"Since them appearance in 1993, the turbo codes gives first best approaching to the Shannon limit, and a new direction for the channel encoding field, especially since they were adopted for multiple norms of telecommunications, such as deeper communication. To obtain an excellent performance it is necessary to design robust turbo code interleaver. We are investigating genetic algorithms as a promising optimization method to find good performing interleaver for the larger frame sizes. In this paper, we present our work, compare with several previous approaches and present some experimental results.","PeriodicalId":446406,"journal":{"name":"2007 17th International Conference Radioelektronika","volume":"29 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":"126064451","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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