Pub Date : 2013-07-11DOI: 10.1109/ISSCS.2013.6651207
I. Dmitrieva
Analytical study of electromagnetic wave propagation is proposed in the case of arbitrary excited expofunctional isotropic linear homogeneous medium. Mathematical simulation is based on the symmetrical differential Maxwell system. Solvability criterion of the latter is proved in the sense of equivalence to the general wave PDE (partial differential equation). It includes all scalar components of unknown electromagnetic field intensities, and only non generalized functions are taken into account. The proven theorem allows considering boundary problems which correctly describe electromagnetic field behavior and / or signal propagation that is governed by it.
{"title":"Some cases of electromagnetic wave propagation in terms of analytical study","authors":"I. Dmitrieva","doi":"10.1109/ISSCS.2013.6651207","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651207","url":null,"abstract":"Analytical study of electromagnetic wave propagation is proposed in the case of arbitrary excited expofunctional isotropic linear homogeneous medium. Mathematical simulation is based on the symmetrical differential Maxwell system. Solvability criterion of the latter is proved in the sense of equivalence to the general wave PDE (partial differential equation). It includes all scalar components of unknown electromagnetic field intensities, and only non generalized functions are taken into account. The proven theorem allows considering boundary problems which correctly describe electromagnetic field behavior and / or signal propagation that is governed by it.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"389 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123198647","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651200
A. De Sabata, A. Ignea
The problem of intermodulation distortions introduced by ferromagnetic materials inclusions in the construction of equipment used for transmission and processing of GSM signals is addressed. A Rayleigh model is implemented for determination of the response of ferromagnetic materials to two-tone signals. Results of experiments performed on coaxial transmission lines built with ferromagnetic materials and fed with two-tone signals are reported and compared to the predictions of the models.
{"title":"Passive intermodulation distortions induced by ferromagnetic materials at GSM frequencies","authors":"A. De Sabata, A. Ignea","doi":"10.1109/ISSCS.2013.6651200","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651200","url":null,"abstract":"The problem of intermodulation distortions introduced by ferromagnetic materials inclusions in the construction of equipment used for transmission and processing of GSM signals is addressed. A Rayleigh model is implemented for determination of the response of ferromagnetic materials to two-tone signals. Results of experiments performed on coaxial transmission lines built with ferromagnetic materials and fed with two-tone signals are reported and compared to the predictions of the models.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127649792","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651226
S. Mischie
The paper presents some aspects regarding the recent introduced time-frequency (T-F) binary mask for speech dereverberation. First of all, a theoretical analysis of the binary mask is presented. It is compared with another T-F binary mask which was used in speech separation, to find some common aspects but also the differences. By using the results of this comparative analysis, we demonstrate the existence of the T-F binary mask for speech dereverberation. To prove our results, relevant experiments are presented.
{"title":"On using time-frequency binary masking for dereverberation","authors":"S. Mischie","doi":"10.1109/ISSCS.2013.6651226","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651226","url":null,"abstract":"The paper presents some aspects regarding the recent introduced time-frequency (T-F) binary mask for speech dereverberation. First of all, a theoretical analysis of the binary mask is presented. It is compared with another T-F binary mask which was used in speech separation, to find some common aspects but also the differences. By using the results of this comparative analysis, we demonstrate the existence of the T-F binary mask for speech dereverberation. To prove our results, relevant experiments are presented.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133265673","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651172
L. Scripcariu, P. Matasaru
This paper is focused on the weakness of the Advanced Encryption Standard (AES) provided by the substitution step of the algorithm, which replaces each input data byte with a fix value provided by a static substitution box (S-box) [1]. Efficiently attacks on software programs secured by AES, are concentrated on whitening the S-box, in order to compromise the encryption key and the private information [2]. We propose an algebraic substitution method which dynamically modifies the “S-box”, based on a key sequence and a mathematic function operating on the Galois Field with 8-bit elements. The algorithm will be more robust under cryptographic attacks and the security of the system will be considerably improved.
{"title":"On the substitution method of the AES algorithm","authors":"L. Scripcariu, P. Matasaru","doi":"10.1109/ISSCS.2013.6651172","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651172","url":null,"abstract":"This paper is focused on the weakness of the Advanced Encryption Standard (AES) provided by the substitution step of the algorithm, which replaces each input data byte with a fix value provided by a static substitution box (S-box) [1]. Efficiently attacks on software programs secured by AES, are concentrated on whitening the S-box, in order to compromise the encryption key and the private information [2]. We propose an algebraic substitution method which dynamically modifies the “S-box”, based on a key sequence and a mathematic function operating on the Galois Field with 8-bit elements. The algorithm will be more robust under cryptographic attacks and the security of the system will be considerably improved.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133308284","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651218
L. Chira, C. Rusu, J. Girault
The quality of the ultrasound medical images is usually degraded by two important problems - the transducer influence and the speckle noise. To remove the multiplicative speckle noise, in this paper it is presented a method based on a blind, time-domain, deconvolution algorithm. The proposed approach uses the envelope of the acquired radio-frequency signals for the numerical implementation. It is a two steps blind deconvolution, where firstly, the point spread function is automatically estimated from the measured data, and secondly, the data are reconstructed in a non-blind way using proposed algorithm. It has a nonlinear implementation which at each step intends to eliminate the most important part of speckle noise and blur as possible. The results on real image tests are compared with Tikhonov regularization. Our method shows better results for scatters detection and speckle noise removal.
{"title":"Speckle noise removal in ultrasound medical imaging using envelope based time domain deconvolution","authors":"L. Chira, C. Rusu, J. Girault","doi":"10.1109/ISSCS.2013.6651218","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651218","url":null,"abstract":"The quality of the ultrasound medical images is usually degraded by two important problems - the transducer influence and the speckle noise. To remove the multiplicative speckle noise, in this paper it is presented a method based on a blind, time-domain, deconvolution algorithm. The proposed approach uses the envelope of the acquired radio-frequency signals for the numerical implementation. It is a two steps blind deconvolution, where firstly, the point spread function is automatically estimated from the measured data, and secondly, the data are reconstructed in a non-blind way using proposed algorithm. It has a nonlinear implementation which at each step intends to eliminate the most important part of speckle noise and blur as possible. The results on real image tests are compared with Tikhonov regularization. Our method shows better results for scatters detection and speckle noise removal.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"271 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133939054","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651263
Jelle Van Rethy, Maarten De Smedt, M. Verhelst, G. Gielen
This paper presents a predictive sensing-based ADC architecture that has improved energy efficiency, compared to a conventional SAR ADC, by exploiting the predictable properties of biomedical signals, such as the electrocardiogram (ECG) signal. By predicting the next input sample, based on previous samples, the conversion is performed in a subrange of the full scale. This results in energy savings compared to the SAR ADC, which always performs the conversion in the full scale. Two search algorithms to perform the conversion in the subrange will be presented and analyzed. For moderate resolutions between 6 and 10 bit, up to 40–50% improvement in terms of energy consumption is obtained, while 25 to 40% for higher resolutions. To validate the concept, a 12-bit predictive ADC, implementing the restricted binary search algorithm with 0-th order prediction, is designed and simulated in 130nm UMC CMOS technology. The simulation results show an improvement in the average energy consumption per conversion, compared to a conventional SAR ADC with the same resolution, which is in the range of 30–40%.
{"title":"Predictive sensing in analog-to-digital converters for biomedical applications","authors":"Jelle Van Rethy, Maarten De Smedt, M. Verhelst, G. Gielen","doi":"10.1109/ISSCS.2013.6651263","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651263","url":null,"abstract":"This paper presents a predictive sensing-based ADC architecture that has improved energy efficiency, compared to a conventional SAR ADC, by exploiting the predictable properties of biomedical signals, such as the electrocardiogram (ECG) signal. By predicting the next input sample, based on previous samples, the conversion is performed in a subrange of the full scale. This results in energy savings compared to the SAR ADC, which always performs the conversion in the full scale. Two search algorithms to perform the conversion in the subrange will be presented and analyzed. For moderate resolutions between 6 and 10 bit, up to 40–50% improvement in terms of energy consumption is obtained, while 25 to 40% for higher resolutions. To validate the concept, a 12-bit predictive ADC, implementing the restricted binary search algorithm with 0-th order prediction, is designed and simulated in 130nm UMC CMOS technology. The simulation results show an improvement in the average energy consumption per conversion, compared to a conventional SAR ADC with the same resolution, which is in the range of 30–40%.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133952091","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651233
Z. Sayegh, M. Latrach, F. Costen, G. El Zein, G. Zaharia
The presence of human body has an important influence on the wireless communication systems in indoor environments. The need of efficient prediction for such coverage becomes essential. This paper present an efficient electromagnetic indoor propagation modeling, taking into account the presence of human body and the nature of materials of the complex environment, based on the Finite-Difference Time-Domain method. Numerical results are compared with measurement results and show a good agreement.
{"title":"Impacts of human body on antenna radiation in indoor environments: Numerical modeling and experimental validation","authors":"Z. Sayegh, M. Latrach, F. Costen, G. El Zein, G. Zaharia","doi":"10.1109/ISSCS.2013.6651233","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651233","url":null,"abstract":"The presence of human body has an important influence on the wireless communication systems in indoor environments. The need of efficient prediction for such coverage becomes essential. This paper present an efficient electromagnetic indoor propagation modeling, taking into account the presence of human body and the nature of materials of the complex environment, based on the Finite-Difference Time-Domain method. Numerical results are compared with measurement results and show a good agreement.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131873525","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651245
R. Vieriu, Ionut Mironica, B. Goras
This paper addresses the problem of Static Hand Gesture Recognition (SHGR) and proposes a fast yet simple solution based on Discrete Hidden Markov Models (DHMMs) that use features extracted from the hand contours. In addition to previous work, the use of depth information ensures robustness to the overall system, making it background invariant. Experiments carried on a challenging noisy dataset reveal the superior discriminating as well as generalizing abilities of statistical models, when compared to state-of-the-art methods.
{"title":"Background invariant static hand gesture recognition based on Hidden Markov Models","authors":"R. Vieriu, Ionut Mironica, B. Goras","doi":"10.1109/ISSCS.2013.6651245","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651245","url":null,"abstract":"This paper addresses the problem of Static Hand Gesture Recognition (SHGR) and proposes a fast yet simple solution based on Discrete Hidden Markov Models (DHMMs) that use features extracted from the hand contours. In addition to previous work, the use of depth information ensures robustness to the overall system, making it background invariant. Experiments carried on a challenging noisy dataset reveal the superior discriminating as well as generalizing abilities of statistical models, when compared to state-of-the-art methods.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115065292","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651194
M. Gliszczynski, G. Cariowa, A. Cariow
In this paper a new approach to the optimized implementation of the Discrete Wavelet Transform (DWT) is presented, which is based on the original algorithm for performing basic DWT procedure with reduced number of multiplications. This approach allows reduction of requirements for hardware cost and computing time and creates usable conditions for effective realization of DWT processor on the common reprogrammable structure.
{"title":"An algorithm for DWT basic procedure rationalized implementation","authors":"M. Gliszczynski, G. Cariowa, A. Cariow","doi":"10.1109/ISSCS.2013.6651194","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651194","url":null,"abstract":"In this paper a new approach to the optimized implementation of the Discrete Wavelet Transform (DWT) is presented, which is based on the original algorithm for performing basic DWT procedure with reduced number of multiplications. This approach allows reduction of requirements for hardware cost and computing time and creates usable conditions for effective realization of DWT processor on the common reprogrammable structure.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114648230","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 : 2013-07-11DOI: 10.1109/ISSCS.2013.6651180
N. Alexandru, A. L. Balan, F. Diaconu
In this paper, we propose and investigate a new improved Nyquist pulse with an asymptotic decay rate of t-2 produced by an improved Nyquist filter with a piece-wise rectangular frequency characteristic. Both the new pulse and the one produced by the square root filter have a closed form expression in time domain and outperform the previously reported pulses in several cases of commonly considered benchmark tests. They are also robust to the root and truncation operations, and suitable for OFDM systems implementation.
{"title":"Square-root improved Nyquist filter with a piecewise rectangular frequency characteristic","authors":"N. Alexandru, A. L. Balan, F. Diaconu","doi":"10.1109/ISSCS.2013.6651180","DOIUrl":"https://doi.org/10.1109/ISSCS.2013.6651180","url":null,"abstract":"In this paper, we propose and investigate a new improved Nyquist pulse with an asymptotic decay rate of t-2 produced by an improved Nyquist filter with a piece-wise rectangular frequency characteristic. Both the new pulse and the one produced by the square root filter have a closed form expression in time domain and outperform the previously reported pulses in several cases of commonly considered benchmark tests. They are also robust to the root and truncation operations, and suitable for OFDM systems implementation.","PeriodicalId":260263,"journal":{"name":"International Symposium on Signals, Circuits and Systems ISSCS2013","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116075881","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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