Pub Date : 2009-07-09DOI: 10.1109/ISSCS.2009.5206132
D. Obeid, S. Sadek, G. Zaharia, G. El Zein
This paper presents a practical study for heartbeat detection at 1 m distance. Our microwave system, based on a vector network analyzer, is used at 2.4 GHz, 5.8 GHz, 10 GHz, 16 GHz, and 60 GHz. Heart Rate Variability is extracted from the time domain variation of the phase of S21 for both the original and the smoothed signal, and its standard deviation is calculated.
{"title":"A tunable-frequency system for touch-less heartbeat detection and HRV extraction","authors":"D. Obeid, S. Sadek, G. Zaharia, G. El Zein","doi":"10.1109/ISSCS.2009.5206132","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206132","url":null,"abstract":"This paper presents a practical study for heartbeat detection at 1 m distance. Our microwave system, based on a vector network analyzer, is used at 2.4 GHz, 5.8 GHz, 10 GHz, 16 GHz, and 60 GHz. Heart Rate Variability is extracted from the time domain variation of the phase of S21 for both the original and the smoothed signal, and its standard deviation is calculated.","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":"128219463","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.2009.5206140
M. Kovaci, H. Balta, M. Nafornita
The turbo code performance over time-varying channels using QPSK modulation is evaluated in this paper. For this purpose we have considered a block random in line (BRL) interleaver. On the basis of this interleaver, we have further simulated the turbo code performance over Rice flat fading channel using 15 iterations. Also, we have studied the impact of the estimation error in the calculation of the channel log-likelihood ratios Lc.
{"title":"On using turbo codes over Rice flat fading channels","authors":"M. Kovaci, H. Balta, M. Nafornita","doi":"10.1109/ISSCS.2009.5206140","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206140","url":null,"abstract":"The turbo code performance over time-varying channels using QPSK modulation is evaluated in this paper. For this purpose we have considered a block random in line (BRL) interleaver. On the basis of this interleaver, we have further simulated the turbo code performance over Rice flat fading channel using 15 iterations. Also, we have studied the impact of the estimation error in the calculation of the channel log-likelihood ratios Lc.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"25 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":"127334274","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.2009.5206174
M. Oltean, A. Isar
Orthogonal modulations are powerful techniques for digital data transmission, very well suited to radio channels. They use orthogonal basis, whose elements will be the “subcarriers” used in transmission. Some advantages of the wavelet functions compared to the windowed complex exponentials used in Orthogonal Frequency Division Multiplexing (OFDM) are highlighted. Thus, theoretical proof that Daubechies wavelets have better time-frequency localization is provided, opening new paths towards modern orthogonal modulation approaches, based on wavelets.
{"title":"On the time-frequency localization of the wavelet signals, with application to orthogonal modulations","authors":"M. Oltean, A. Isar","doi":"10.1109/ISSCS.2009.5206174","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206174","url":null,"abstract":"Orthogonal modulations are powerful techniques for digital data transmission, very well suited to radio channels. They use orthogonal basis, whose elements will be the “subcarriers” used in transmission. Some advantages of the wavelet functions compared to the windowed complex exponentials used in Orthogonal Frequency Division Multiplexing (OFDM) are highlighted. Thus, theoretical proof that Daubechies wavelets have better time-frequency localization is provided, opening new paths towards modern orthogonal modulation approaches, based on wavelets.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"44 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":"130674619","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.2009.5206113
A. Manolescu, A. Manolescu
Some important properties of indefinite matrices describing symmetrical lumped resistive networks are presented. A new property for the product of the indefinite matrices Yi and Zi corresponding to total symmetrical networks is discussed. These results are useful for modeling by electrical equivalence many problems in signal processing, computer networking, parallel computing, computer vision, and many others.
{"title":"On symmetry properties of lumped resistive networks","authors":"A. Manolescu, A. Manolescu","doi":"10.1109/ISSCS.2009.5206113","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206113","url":null,"abstract":"Some important properties of indefinite matrices describing symmetrical lumped resistive networks are presented. A new property for the product of the indefinite matrices Yi and Zi corresponding to total symmetrical networks is discussed. These results are useful for modeling by electrical equivalence many problems in signal processing, computer networking, parallel computing, computer vision, and many others.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"123 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":"131506330","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.2009.5206217
S. Goto
{"title":"Recent advance in video processing technology","authors":"S. Goto","doi":"10.1109/ISSCS.2009.5206217","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206217","url":null,"abstract":"","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"66 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":"131544322","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.2009.5206091
Yijun Liu, Guobo Xie, Pinghua Chen, Jingyu Chen, Zhenkun Li
Battery-powered sensor nodes call for low power consumption. As a crucial component, a power-efficient sensor network processor greatly reduce the overall power consumption of a node. In the paper, we propose a low-power asynchronous event-driven sensor network processor mapped onto an off-the-shelf clocked FPGA. Since the processor employs a bundled-data asynchronous encoding scheme, we define a design flow that can use commercial synchronous design tools. No global clock is needed when the processor is in an idle state, thus the standby active power consumption is zero. The use of asynchronous design also results in a quick wakeup response with little design and power overheads. Moreover, an event-driven architecture is proposed to minimize the execution overheads caused by exceptions, interrupts and MMU handling of a conventional microprocessor.
{"title":"Designing an asynchronous FPGA processor for low-power sensor networks","authors":"Yijun Liu, Guobo Xie, Pinghua Chen, Jingyu Chen, Zhenkun Li","doi":"10.1109/ISSCS.2009.5206091","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206091","url":null,"abstract":"Battery-powered sensor nodes call for low power consumption. As a crucial component, a power-efficient sensor network processor greatly reduce the overall power consumption of a node. In the paper, we propose a low-power asynchronous event-driven sensor network processor mapped onto an off-the-shelf clocked FPGA. Since the processor employs a bundled-data asynchronous encoding scheme, we define a design flow that can use commercial synchronous design tools. No global clock is needed when the processor is in an idle state, thus the standby active power consumption is zero. The use of asynchronous design also results in a quick wakeup response with little design and power overheads. Moreover, an event-driven architecture is proposed to minimize the execution overheads caused by exceptions, interrupts and MMU handling of a conventional microprocessor.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"12 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":"132328649","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.2009.5206114
R. Iacob, O. Neagoe, A. Manolescu
Digital potentiometers are extensively used for digitally controlled adjustments in mixed-signal systems. The demand for higher resolution and increased tuning accuracy is driving the research efforts toward developing multistage potentiometer architectures that employ special techniques for achieving high precision with fewer components. This paper describes such architectures and techniques.
{"title":"Multistage architectures for high resolution digital potentiometers","authors":"R. Iacob, O. Neagoe, A. Manolescu","doi":"10.1109/ISSCS.2009.5206114","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206114","url":null,"abstract":"Digital potentiometers are extensively used for digitally controlled adjustments in mixed-signal systems. The demand for higher resolution and increased tuning accuracy is driving the research efforts toward developing multistage potentiometer architectures that employ special techniques for achieving high precision with fewer components. This paper describes such architectures and techniques.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"22 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":"122295001","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.2009.5206126
R. Dogaru
This paper introduces random number generators based on hybrid cellular automata (HCA). It is shown that by properly mixing CA cells from two categories (two different rules) an automaton generating near maximal length pseudo-random sequences can be easily obtained. The resulting system is similar to the well-known linear feedback shift register (LFSR) but in addition it posses the binary synchronization property that makes it a valuable ingredient for many applications.
{"title":"Hybrid cellular automata as pseudo-random number generators with binary synchronization property","authors":"R. Dogaru","doi":"10.1109/ISSCS.2009.5206126","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206126","url":null,"abstract":"This paper introduces random number generators based on hybrid cellular automata (HCA). It is shown that by properly mixing CA cells from two categories (two different rules) an automaton generating near maximal length pseudo-random sequences can be easily obtained. The resulting system is similar to the well-known linear feedback shift register (LFSR) but in addition it posses the binary synchronization property that makes it a valuable ingredient for many applications.","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":"130628533","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.2009.5206101
S. Emerich, E. Lupu, A. Apatean
This paper aims to present a multimodal approach in emotion recognition which integrates information from both facial expressions and speech signal. Using two acted databases on different subjects, we were able to emphasize six emotions: sadness, anger, happiness, disgust, fear and neutral state. The models in the system were designed and tested by using a Support Vector Machine classifier. Firstly, the analysis of the strengths and the limitations of the systems based only on facial expressions or speech signal was performed. Data was then fused at the feature level. The results show that in this case the performance and the robustness of the emotion recognition system have been improved.
{"title":"Bimodal approach in emotion recognition using speech and facial expressions","authors":"S. Emerich, E. Lupu, A. Apatean","doi":"10.1109/ISSCS.2009.5206101","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206101","url":null,"abstract":"This paper aims to present a multimodal approach in emotion recognition which integrates information from both facial expressions and speech signal. Using two acted databases on different subjects, we were able to emphasize six emotions: sadness, anger, happiness, disgust, fear and neutral state. The models in the system were designed and tested by using a Support Vector Machine classifier. Firstly, the analysis of the strengths and the limitations of the systems based only on facial expressions or speech signal was performed. Data was then fused at the feature level. The results show that in this case the performance and the robustness of the emotion recognition system have been improved.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"397 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":"134314126","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.2009.5206195
E. Gudmundson, Jun Ling, P. Stoica, Jian Li, A. Jakobsson
The problem of estimating a spectral representation of damped sinusoidal signals from a gapped data set is of considerable interest in several applications. In this paper, we propose a new iterative adaptive approach, named dIAA, that provides such an estimate also in the case of irregularly sampled data, a common scenario in, for instance, spectroscopical data measurements. Numerical examples illustrate the benefits of the proposed estimator as compared to typically used methods.
{"title":"Spectral estimation of damped sinusoids in the case of irregularly sampled data","authors":"E. Gudmundson, Jun Ling, P. Stoica, Jian Li, A. Jakobsson","doi":"10.1109/ISSCS.2009.5206195","DOIUrl":"https://doi.org/10.1109/ISSCS.2009.5206195","url":null,"abstract":"The problem of estimating a spectral representation of damped sinusoidal signals from a gapped data set is of considerable interest in several applications. In this paper, we propose a new iterative adaptive approach, named dIAA, that provides such an estimate also in the case of irregularly sampled data, a common scenario in, for instance, spectroscopical data measurements. Numerical examples illustrate the benefits of the proposed estimator as compared to typically used methods.","PeriodicalId":277587,"journal":{"name":"2009 International Symposium on Signals, Circuits and Systems","volume":"53 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":"128625117","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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