Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206124
Alina Buleandra, T. Petrescu, O. Fratu
In this article the compatibility between a hearing aid and a cellular phone is studied. Simulation results obtained for 2.5 GHz, 3.5 GHz and 5.4 GHz using commercial software based on the finite difference time domain method were presented and were compared to the values imposed by international standardization committees.
{"title":"Evaluating the hearing aid compatibility of a cellular phone working at WiMAX carrier frequencies","authors":"Alina Buleandra, T. Petrescu, O. Fratu","doi":"10.1109/ISSCS.2009.5206124","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206124","url":null,"abstract":"In this article the compatibility between a hearing aid and a cellular phone is studied. Simulation results obtained for 2.5 GHz, 3.5 GHz and 5.4 GHz using commercial software based on the finite difference time domain method were presented and were compared to the values imposed by international standardization committees.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115168059","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206097
S. Chattopadhyay, S. K. Sanyal
Modern communication system demands special attention to use primary resources like transmitted power and channel bandwidth. Due to optimum requirement of bandwidth and power, the Quadrature Phase Shift Keying (QPSK) is well suited for different applications in mobile as well as satellite communication. Proper pulse shaping technique makes a digital communication system possible to transmit data within a limited bandwidth with a minimum value of Inter Symbol Interference (ISI). In this paper we have presented the measurement results of some useful performance parameters of QPSK system like, Error Vector Magnitude (EVM), Signal to Noise Ratio (SNR) and Bandwidth Efficiency with respect to roll-off factor (α) of Gaussian pulse-shaping filter. The effect of Gaussian filter α on system ISI has been studied by recording the eye diagram of the system. The performance of the Gaussian filter has also been compared with other conventional pulse-shaping filters like, Raised Cosine and Root Raised Cosine filter.
{"title":"The effect of gaussian pulse-shaping filter roll-off factor on the performance of QPSK modulated system","authors":"S. Chattopadhyay, S. K. Sanyal","doi":"10.1109/ISSCS.2009.5206097","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206097","url":null,"abstract":"Modern communication system demands special attention to use primary resources like transmitted power and channel bandwidth. Due to optimum requirement of bandwidth and power, the Quadrature Phase Shift Keying (QPSK) is well suited for different applications in mobile as well as satellite communication. Proper pulse shaping technique makes a digital communication system possible to transmit data within a limited bandwidth with a minimum value of Inter Symbol Interference (ISI). In this paper we have presented the measurement results of some useful performance parameters of QPSK system like, Error Vector Magnitude (EVM), Signal to Noise Ratio (SNR) and Bandwidth Efficiency with respect to roll-off factor (α) of Gaussian pulse-shaping filter. The effect of Gaussian filter α on system ISI has been studied by recording the eye diagram of the system. The performance of the Gaussian filter has also been compared with other conventional pulse-shaping filters like, Raised Cosine and Root Raised Cosine filter.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115268558","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206185
Andreea Smoaca, D. Coltuc, V. Lazarescu
This paper presents some results regarding the automatic segmentation of patterns in images of textile samples. The pattern segmentation is necessary for further extraction of a set of shape descriptors to be used in a CBIR database for textiles. Five different filters for removing the fabrics texture have been tested: mean, median, Gaussian, soft wavelet thresholding and a new approach based on Wavelet Transform and Independent Components Analysis. For segmentation, due to the poor color content of the images, the binarization proved to be a satisfactory choice. Three algorithms for the threshold computation have been tested: Otsu, background symmetry and triangle.
{"title":"Pattern segmentation in textile images","authors":"Andreea Smoaca, D. Coltuc, V. Lazarescu","doi":"10.1109/ISSCS.2009.5206185","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206185","url":null,"abstract":"This paper presents some results regarding the automatic segmentation of patterns in images of textile samples. The pattern segmentation is necessary for further extraction of a set of shape descriptors to be used in a CBIR database for textiles. Five different filters for removing the fabrics texture have been tested: mean, median, Gaussian, soft wavelet thresholding and a new approach based on Wavelet Transform and Independent Components Analysis. For segmentation, due to the poor color content of the images, the binarization proved to be a satisfactory choice. Three algorithms for the threshold computation have been tested: Otsu, background symmetry and triangle.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115463576","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206096
M. Benssalah, M. Djeddou
In this paper, an implementation of synchronization algorithms in digital communication systems such as carrier phase recovery and symbol timing recovery is presented. For this implementation, we use the development kit TMS320C6711 DSK with a rapid prototype method. The implemented algorithms are founded on estimators and detectors derived from the maximum likelihood (ML) approach. Feedback and Feedforward structures are considered. These algorithms operate in Non-Data-Aided (NDA) mode or Decision Directed (DD) mode. For the problem of symbol timing recovery synchronization, we used the Gardner, Early Late Gate and Mueller & Muller algorithms. The obtained implementation results are very promising.
本文介绍了数字通信系统中载波相位恢复和符号时序恢复等同步算法的实现。为此，我们使用开发套件tms320c6711dsk，采用快速原型法实现。所实现的算法建立在极大似然(ML)方法的估计器和检测器的基础上。考虑了反馈和前馈结构。这些算法以非数据辅助(NDA)模式或直接决策(DD)模式运行。对于符号时序恢复同步问题，我们使用了Gardner、Early Late Gate和Mueller & Muller算法。所获得的实施效果是很有希望的。
{"title":"Implementation of synchronization algorithms, carrier phase recovery and symbol timing recovery, on a digital signal processor","authors":"M. Benssalah, M. Djeddou","doi":"10.1109/ISSCS.2009.5206096","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206096","url":null,"abstract":"In this paper, an implementation of synchronization algorithms in digital communication systems such as carrier phase recovery and symbol timing recovery is presented. For this implementation, we use the development kit TMS320C6711 DSK with a rapid prototype method. The implemented algorithms are founded on estimators and detectors derived from the maximum likelihood (ML) approach. Feedback and Feedforward structures are considered. These algorithms operate in Non-Data-Aided (NDA) mode or Decision Directed (DD) mode. For the problem of symbol timing recovery synchronization, we used the Gardner, Early Late Gate and Mueller & Muller algorithms. The obtained implementation results are very promising.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126035062","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206125
G. Sirbu, I. Bogdan
Software agents are specialized entities, which can perform different tasks in order to achieve different goals. The structure based on agents is of decentralized type, in which agents perform their activities independently. However, the respective structure needs a specific environment in order to exist and to interact. This work is focused on creation of an agent structure laid on the TCP/IP protocol, using MaSE technology. The structure was created with an automated tool, namely AgentTool - a Java based platform- and then was verified on a Dynamic Channel Allocation Scheme simulation, using several Microsoft Windows-based computers.
{"title":"Dynamic channel allocation scheme simulation using agents technology","authors":"G. Sirbu, I. Bogdan","doi":"10.1109/ISSCS.2009.5206125","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206125","url":null,"abstract":"Software agents are specialized entities, which can perform different tasks in order to achieve different goals. The structure based on agents is of decentralized type, in which agents perform their activities independently. However, the respective structure needs a specific environment in order to exist and to interact. This work is focused on creation of an agent structure laid on the TCP/IP protocol, using MaSE technology. The structure was created with an automated tool, namely AgentTool - a Java based platform- and then was verified on a Dynamic Channel Allocation Scheme simulation, using several Microsoft Windows-based computers.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116560311","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206121
C. Anghel, C. Paleologu, J. Benesty, S. Ciochină
Many interesting adaptive algorithms have been proposed for acoustic echo cancellation. Even if they exhibit good performance in “infinite” precision, their capabilities could be seriously affected when using practical implementation platforms, e.g., digital signal processor (DSP) or field-programmable gate array (FPGA). In this context, several finite-precision effects could seriously bias the acoustic echo canceller (AEC) behavior. In this paper, we present an FPGA implementation of an AEC based on a recently proposed variable step-size normalized least-mean-square (VSS-NLMS) algorithm. Area and speed results are provided for a XC2S600E chip. The overall performance of this AEC indicates that it could be a reliable solution for real-world acoustic echo cancellation scenarios.
{"title":"FPGA implementation of an acoustic echo canceller using a VSS-NLMS algorithm","authors":"C. Anghel, C. Paleologu, J. Benesty, S. Ciochină","doi":"10.1109/ISSCS.2009.5206121","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206121","url":null,"abstract":"Many interesting adaptive algorithms have been proposed for acoustic echo cancellation. Even if they exhibit good performance in “infinite” precision, their capabilities could be seriously affected when using practical implementation platforms, e.g., digital signal processor (DSP) or field-programmable gate array (FPGA). In this context, several finite-precision effects could seriously bias the acoustic echo canceller (AEC) behavior. In this paper, we present an FPGA implementation of an AEC based on a recently proposed variable step-size normalized least-mean-square (VSS-NLMS) algorithm. Area and speed results are provided for a XC2S600E chip. The overall performance of this AEC indicates that it could be a reliable solution for real-world acoustic echo cancellation scenarios.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121887272","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206168
A. Grama, L. Grama, D. Petreus, C. Rusu
Supercapacitors are components for energy storage, dedicated for applications where both energy and power density are needed. Even if their energy density is ten times lower than the energy density of batteries, supercapacitors offer new alternatives for applications where energy storage is needed. We have done an experimental bench and we have measured the voltage across a supercapacitor in a constant current charge/discharge cycle. Using these measurements and a mathematical algorithm we have proposed an electrical model for the supercapacitor, and we have determined the parameters of the model also.
{"title":"Supercapacitor modelling using experimental measurements","authors":"A. Grama, L. Grama, D. Petreus, C. Rusu","doi":"10.1109/ISSCS.2009.5206168","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206168","url":null,"abstract":"Supercapacitors are components for energy storage, dedicated for applications where both energy and power density are needed. Even if their energy density is ten times lower than the energy density of batteries, supercapacitors offer new alternatives for applications where energy storage is needed. We have done an experimental bench and we have measured the voltage across a supercapacitor in a constant current charge/discharge cycle. Using these measurements and a mathematical algorithm we have proposed an electrical model for the supercapacitor, and we have determined the parameters of the model also.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129827768","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206130
L. Țigăeru
Nowadays trends in the electronic system design look beyond the conventional computing architectures towards biologically inspired solutions to find new circuit ideas to advance the computational power of the future computational structures. The present paper introduces a VHDL-AMS based spiking neuron model, which exhibits realistic behavior. This approach is suitable to integrate hybrid neuro-eletronic circuits into a compact model used to perform the functional verification of the electronic system, which precedes its VLSI implementation.
{"title":"A VHDL-AMS based spiking neuron model","authors":"L. Țigăeru","doi":"10.1109/ISSCS.2009.5206130","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206130","url":null,"abstract":"Nowadays trends in the electronic system design look beyond the conventional computing architectures towards biologically inspired solutions to find new circuit ideas to advance the computational power of the future computational structures. The present paper introduces a VHDL-AMS based spiking neuron model, which exhibits realistic behavior. This approach is suitable to integrate hybrid neuro-eletronic circuits into a compact model used to perform the functional verification of the electronic system, which precedes its VLSI implementation.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128675332","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206083
Alina Sultana, M. Ciuc, L. Florea, C. Florea
Detection and characterization of microcalcification clusters in mammograms is vital in daily clinical practice. The problem of detecting possible cancer areas is very complex due, on one hand, to the diversity in shape of the ill tissue and, on the other hand, to the poorly defined border between the healthy and the cancerous zone. Even though it has been studied for many years, there are still remaining challenges and directions for future research, such as developing better enhancement and segmentation algorithms. In this paper, we propose a microcalcification detection algorithm using an extended region growing technique in a mammography CAD (computer-aided diagnosis) system.
{"title":"Detection of mammographic microcalcifications using a refined region-growing approach","authors":"Alina Sultana, M. Ciuc, L. Florea, C. Florea","doi":"10.1109/ISSCS.2009.5206083","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206083","url":null,"abstract":"Detection and characterization of microcalcification clusters in mammograms is vital in daily clinical practice. The problem of detecting possible cancer areas is very complex due, on one hand, to the diversity in shape of the ill tissue and, on the other hand, to the poorly defined border between the healthy and the cancerous zone. Even though it has been studied for many years, there are still remaining challenges and directions for future research, such as developing better enhancement and segmentation algorithms. In this paper, we propose a microcalcification detection algorithm using an extended region growing technique in a mammography CAD (computer-aided diagnosis) system.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123524145","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 : 2009-07-09DOI: 10.1109/ISSCS.2009.5206087
Meththa Samaranayake, Helen Ji, J. Ainscough
Graph drawing is one of the most straightforward methods of representing a network. This paper would like to explore the possibility of modifying existing graph drawing algorithms for the purpose of module placement. Possible changes and results of those changes are discussed, as well as a performance comparison with a leading academic placement tool.
{"title":"Graph drawing alogorithms based module placement","authors":"Meththa Samaranayake, Helen Ji, J. Ainscough","doi":"10.1109/ISSCS.2009.5206087","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206087","url":null,"abstract":"Graph drawing is one of the most straightforward methods of representing a network. This paper would like to explore the possibility of modifying existing graph drawing algorithms for the purpose of module placement. Possible changes and results of those changes are discussed, as well as a performance comparison with a leading academic placement tool.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"190 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114352523","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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