Pub Date : 2011-10-13DOI: 10.1109/TSP.2011.6043703
P. Marcon, K. Bartusek, R. Kořínek, Z. Dokoupil
The authors describe the techniques for measuring diffusion coefficients and creating DWI and DTI images. In order to increase the accuracy of diffusion coefficient measurement, it is necessary to eliminate the influence of artifacts such as the influence of magnetic field inhomogeneity, eddy currents, or temperature. For these artifact sources, the article presents experimental detection of the magnitude of errors, which is realized using the three measurements method, and proposes correction possibilities. The results are compared with diffusion measurements at different sizes of 6-factors.
{"title":"Correction of artifacts in diffusion-weighted MR images","authors":"P. Marcon, K. Bartusek, R. Kořínek, Z. Dokoupil","doi":"10.1109/TSP.2011.6043703","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043703","url":null,"abstract":"The authors describe the techniques for measuring diffusion coefficients and creating DWI and DTI images. In order to increase the accuracy of diffusion coefficient measurement, it is necessary to eliminate the influence of artifacts such as the influence of magnetic field inhomogeneity, eddy currents, or temperature. For these artifact sources, the article presents experimental detection of the magnitude of errors, which is realized using the three measurements method, and proposes correction possibilities. The results are compared with diffusion measurements at different sizes of 6-factors.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128762322","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043751
A. Marczak
The paper presents the construction of encoders and decoders turbo codes with different number of states. Simulation results of the transmission quality of turbo codes were presented. Decoders for turbo codes have been tested with a fixed number of iterations and with mechanisms that reduce the number of iterations. The data were transmitted in an Outdoor to Indoor & Pedestrian B environment for a data rate of 384 kbps. The SOVA algorithm was used for turbo decoders.
{"title":"Comparison of the efficiency of turbo codes with different number of states","authors":"A. Marczak","doi":"10.1109/TSP.2011.6043751","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043751","url":null,"abstract":"The paper presents the construction of encoders and decoders turbo codes with different number of states. Simulation results of the transmission quality of turbo codes were presented. Decoders for turbo codes have been tested with a fixed number of iterations and with mechanisms that reduce the number of iterations. The data were transmitted in an Outdoor to Indoor & Pedestrian B environment for a data rate of 384 kbps. The SOVA algorithm was used for turbo decoders.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125131859","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043726
R. Sotner, J. Jerabek, N. Herencsar, T. Dostál, K. Vrba
Several modeled conceptions of current follower (or amplifier) with electronically adjustable input (intrinsic) resistance and current gain (in case of amplifier) are presented in the contribution. Features of proposed models are documented by symbolical analyses when considering important parasitic small signal properties. An example of behavior of such model is verified by simulations in PSpice. Described approaches allow design of applications without external (in IC case) floating resistors. Simple examples of two functional adjustable voltage mode biquad and oscillator are included.
{"title":"Additional approach to the conception of current follower and amplifier with controllable features","authors":"R. Sotner, J. Jerabek, N. Herencsar, T. Dostál, K. Vrba","doi":"10.1109/TSP.2011.6043726","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043726","url":null,"abstract":"Several modeled conceptions of current follower (or amplifier) with electronically adjustable input (intrinsic) resistance and current gain (in case of amplifier) are presented in the contribution. Features of proposed models are documented by symbolical analyses when considering important parasitic small signal properties. An example of behavior of such model is verified by simulations in PSpice. Described approaches allow design of applications without external (in IC case) floating resistors. Simple examples of two functional adjustable voltage mode biquad and oscillator are included.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114759665","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043770
Patrik Moravek, D. Komosny, Milan Simek, Lubomir Mraz
Limited energy sources of nodes in wireless sensor networks require a careful consideration of energy consumption of all processes during the sensors deployment. To analyze energy consumption and to predict a lifetime of a network, a comprehensive energy model based on commercial products is necessary. Therefore, we have focused on the analysis of energy consumption during RF communication with particular 802.15.4 compliant nodes. We have designed experimental testbed and explored the scenario of node association and data transmission. For the measurement we used IRIS sensor nodes with 802.15.4/Zigbee protocol stack and shunt connection. The results show that energy consumption cannot be calculated only from datasheet values of current drain and length of a packet but intervals of listening and waiting between transmissions play important role as well.
{"title":"Energy demands of 802.15.4/ZigBee communication with IRIS sensor motes","authors":"Patrik Moravek, D. Komosny, Milan Simek, Lubomir Mraz","doi":"10.1109/TSP.2011.6043770","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043770","url":null,"abstract":"Limited energy sources of nodes in wireless sensor networks require a careful consideration of energy consumption of all processes during the sensors deployment. To analyze energy consumption and to predict a lifetime of a network, a comprehensive energy model based on commercial products is necessary. Therefore, we have focused on the analysis of energy consumption during RF communication with particular 802.15.4 compliant nodes. We have designed experimental testbed and explored the scenario of node association and data transmission. For the measurement we used IRIS sensor nodes with 802.15.4/Zigbee protocol stack and shunt connection. The results show that energy consumption cannot be calculated only from datasheet values of current drain and length of a packet but intervals of listening and waiting between transmissions play important role as well.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970016","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043676
Z. Krajcuskova, M. Kukucka
Time-frequency signal representations are modern methods of signal processing, which can also be applied to test the homogeneity of the Poisson process. They can therefore be used to search for an unconventional reliability growth model (RGM) of electronic systems. In this paper we will present an approach to searching for unconventional reliability growth models of electronic system by testing the homogeneity of the Poisson process in its time-frequency representation.
{"title":"Time-frequency representation and unconventional reliability growth model","authors":"Z. Krajcuskova, M. Kukucka","doi":"10.1109/TSP.2011.6043676","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043676","url":null,"abstract":"Time-frequency signal representations are modern methods of signal processing, which can also be applied to test the homogeneity of the Poisson process. They can therefore be used to search for an unconventional reliability growth model (RGM) of electronic systems. In this paper we will present an approach to searching for unconventional reliability growth models of electronic system by testing the homogeneity of the Poisson process in its time-frequency representation.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123061534","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043683
Petr Svabenik, David Zeman, R. Balada, Z. Fedra
This paper describes methods which will be used in the separation of multiple secondary surveillance radar replies. Mainly the A/C mode is examined. The aim of this research is to examine several methods to apply correlation of signal with template to isolate transponder reply. Thoughts are to use a differentiation of signal to better the correlation response and avoid false reception.
{"title":"Separation of secondary surveillance radar signals","authors":"Petr Svabenik, David Zeman, R. Balada, Z. Fedra","doi":"10.1109/TSP.2011.6043683","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043683","url":null,"abstract":"This paper describes methods which will be used in the separation of multiple secondary surveillance radar replies. Mainly the A/C mode is examined. The aim of this research is to examine several methods to apply correlation of signal with template to isolate transponder reply. Thoughts are to use a differentiation of signal to better the correlation response and avoid false reception.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122163266","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043678
M. B. Zid, K. Raoof, A. Bouallègue
This paper is concerned with localization in wireless sensor networks (WSNs). We propose a novel localization algorithm based beamforming. The performed localization algorithm is adopted for a typical communication model in WSNs involving two clusters of sensors at both transmitter and receiver sides of the communication link. The set of collaborative sensor nodes located at the transmit cluster could be assimilated to a distributed Multiple Input Multiple Output (MIMO) system [1], [2], [3]. We tackle the task of estimating the position of randomly distributed sensor nodes and we present a novel algorithm based on the beamforming approach [4], [5] and the received signal strength (SS) measurement. The correct operation of the proposed algorithm has been proved by simulation. The collected results for the sampling deviation of the estimator and the estimator variance are envisaged in order to evaluate the accuracy of the proposed algorithm.
{"title":"Beamforming approach for localization in WSN based received signal strength","authors":"M. B. Zid, K. Raoof, A. Bouallègue","doi":"10.1109/TSP.2011.6043678","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043678","url":null,"abstract":"This paper is concerned with localization in wireless sensor networks (WSNs). We propose a novel localization algorithm based beamforming. The performed localization algorithm is adopted for a typical communication model in WSNs involving two clusters of sensors at both transmitter and receiver sides of the communication link. The set of collaborative sensor nodes located at the transmit cluster could be assimilated to a distributed Multiple Input Multiple Output (MIMO) system [1], [2], [3]. We tackle the task of estimating the position of randomly distributed sensor nodes and we present a novel algorithm based on the beamforming approach [4], [5] and the received signal strength (SS) measurement. The correct operation of the proposed algorithm has been proved by simulation. The collected results for the sampling deviation of the estimator and the estimator variance are envisaged in order to evaluate the accuracy of the proposed algorithm.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126695869","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043723
M. Stork
The frequency synthesis is one of the most important and most actively researched subjects in the field of VLSI mixed-signal circuit design. Among the existing techniques in this area, phase locked loop fractional architecture is a widely used one for generating frequencies which are not integer multiple of the input reference frequency. Flying-Adder architecture is an emerging technique which is based on a new concept time-average-frequency, to generate frequencies. This paper presents simple fractional frequency synthesizer architecture based on concept flying-adder and phase locked loop principle. The simulation results concerning this approach are presented.
{"title":"Fractional frequency synthesizer using flying adder principle","authors":"M. Stork","doi":"10.1109/TSP.2011.6043723","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043723","url":null,"abstract":"The frequency synthesis is one of the most important and most actively researched subjects in the field of VLSI mixed-signal circuit design. Among the existing techniques in this area, phase locked loop fractional architecture is a widely used one for generating frequencies which are not integer multiple of the input reference frequency. Flying-Adder architecture is an emerging technique which is based on a new concept time-average-frequency, to generate frequencies. This paper presents simple fractional frequency synthesizer architecture based on concept flying-adder and phase locked loop principle. The simulation results concerning this approach are presented.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127015068","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043740
M. Koutny, P. Mlynek, Petr Mrakava
There are a lot of MAC approaches in the power line communication. This paper is focused on the most widespread broadband power line communication, HomePlug system. The paper deals with the medium access control function of the HomePlug system. The various probabilistic distributions were tested for random values generating. We show, that it is important to choose the suitable rounding function for a random integer number getting.
{"title":"HomePlug simulation model for analysis of the rounding functions","authors":"M. Koutny, P. Mlynek, Petr Mrakava","doi":"10.1109/TSP.2011.6043740","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043740","url":null,"abstract":"There are a lot of MAC approaches in the power line communication. This paper is focused on the most widespread broadband power line communication, HomePlug system. The paper deals with the medium access control function of the HomePlug system. The various probabilistic distributions were tested for random values generating. We show, that it is important to choose the suitable rounding function for a random integer number getting.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114778326","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 : 2011-10-13DOI: 10.1109/TSP.2011.6043778
Vesna M. Radonjic-Djogatovic, V. Acimovic-Raspopovic, A. Kostić-Ljubisavljević, Snezana Mladenovic
In this paper some important requirements for game theory based pricing of services in Next generation networks are discussed. We propose the Cournot game for modelling the economic interactions of two service providers offering the same service and sharing the same network resources. The proposed model is verified through numerous numerical examples. In this paper we analyze numerical results for different total costs of the observed competitive service providers. We analyzed possibilities of the existence of Nash equilibrium in several such cases.
{"title":"Pricing aspects of competition among service providers in next generation networks","authors":"Vesna M. Radonjic-Djogatovic, V. Acimovic-Raspopovic, A. Kostić-Ljubisavljević, Snezana Mladenovic","doi":"10.1109/TSP.2011.6043778","DOIUrl":"https://doi.org/10.1109/TSP.2011.6043778","url":null,"abstract":"In this paper some important requirements for game theory based pricing of services in Next generation networks are discussed. We propose the Cournot game for modelling the economic interactions of two service providers offering the same service and sharing the same network resources. The proposed model is verified through numerous numerical examples. In this paper we analyze numerical results for different total costs of the observed competitive service providers. We analyzed possibilities of the existence of Nash equilibrium in several such cases.","PeriodicalId":341695,"journal":{"name":"2011 34th International Conference on Telecommunications and Signal Processing (TSP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129548824","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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