Pub Date : 2003-07-10DOI: 10.1109/SCS.2003.1226937
E. Efremova, N. Maksimov, A. Panas
In this report the problem of forming chaotic signals with prescribed spectrum is discussed. Possibilities of chaotic spectrum control in band-limited chaotic oscillator are demonstrated. Dependence of the form and ruggedness of chaotic spectrum on system parameters is shown.
{"title":"Control of power spectrum envelope in single-transistor chaotic oscillator","authors":"E. Efremova, N. Maksimov, A. Panas","doi":"10.1109/SCS.2003.1226937","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226937","url":null,"abstract":"In this report the problem of forming chaotic signals with prescribed spectrum is discussed. Possibilities of chaotic spectrum control in band-limited chaotic oscillator are demonstrated. Dependence of the form and ruggedness of chaotic spectrum on system parameters is shown.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126581640","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227090
B. Dumitrescu
We describe a convex domain around a given stable 2-D polynomial, in the form of a linear matrix inequality. Such a domain is useful in the design of 2-D IIR filters with non-separable denominator.
{"title":"2-D convex stability domain","authors":"B. Dumitrescu","doi":"10.1109/SCS.2003.1227090","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227090","url":null,"abstract":"We describe a convex domain around a given stable 2-D polynomial, in the form of a linear matrix inequality. Such a domain is useful in the design of 2-D IIR filters with non-separable denominator.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130391226","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 : 2003-07-10DOI: 10.1109/SCS.2003.1226975
M. Costin, A. Grichnik, M. Zbancioc
This study reveals more interesting aspects on speaker and speech recognition as: 1. different importance of certain spectral frequency bands on the process of speaker and speech recognition; 2. signal phase has a significant importance; and 3. vowel recognition is preponderant in the decision weighting. To resolve the paradox described in A.J. Grichnik (2000), autoregressive (AR) coefficients were used to compute feature vectors in order to teach neural networks (NN). Tests made by using a two layer perceptron (MLP) were compared to a radial basis function (RBF) network in order to obtain the best recognition results.
{"title":"Tips on speaker recognition by autoregressive parameters and connectionist methods","authors":"M. Costin, A. Grichnik, M. Zbancioc","doi":"10.1109/SCS.2003.1226975","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226975","url":null,"abstract":"This study reveals more interesting aspects on speaker and speech recognition as: 1. different importance of certain spectral frequency bands on the process of speaker and speech recognition; 2. signal phase has a significant importance; and 3. vowel recognition is preponderant in the decision weighting. To resolve the paradox described in A.J. Grichnik (2000), autoregressive (AR) coefficients were used to compute feature vectors in order to teach neural networks (NN). Tests made by using a two layer perceptron (MLP) were compared to a radial basis function (RBF) network in order to obtain the best recognition results.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134644444","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227011
C. Comsa, I. Bogdan
Multicarrier or Orthogonal Frequency Division Multiplexing (OFDM) has gain recently an increased interest with the development of faster signal processing components and technologies. OFDM has been shown to be a very efficient scheme for mitigating the adverse effects of inter-symbol interference, squeezing multiple modulated carriers tightly together but keeping the modulated signals orthogonal so they do not interfere with each other's. This paper describes the system level model of the OFDM baseband and uses it to evaluate the BER performance.
{"title":"System level design of baseband OFDM for wireless LAN","authors":"C. Comsa, I. Bogdan","doi":"10.1109/SCS.2003.1227011","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227011","url":null,"abstract":"Multicarrier or Orthogonal Frequency Division Multiplexing (OFDM) has gain recently an increased interest with the development of faster signal processing components and technologies. OFDM has been shown to be a very efficient scheme for mitigating the adverse effects of inter-symbol interference, squeezing multiple modulated carriers tightly together but keeping the modulated signals orthogonal so they do not interfere with each other's. This paper describes the system level model of the OFDM baseband and uses it to evaluate the BER performance.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131575002","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 : 2003-07-10DOI: 10.1109/SCS.2003.1226964
S. Di Pascoli, L. Fanucci, F. Giusti, B. Neri, D. Zito
A fully integrated RF single-conversion heterodyne receiver front-end for ISM band (2.44 GHz) wireless applications is presented. The circuit realizes a high image rejection by exploiting a band pass low noise amplifier and an image-reject mixer according to the Hartley architecture. The front-end has been designed on a 50 GHz cut-off frequency bipolar process. The main characteristics of this design are an overall image-rejection greater than 57 dB at 110 MHz of intermediate frequency, a transducer power gain of 32 dB, a bandwidth of 80 MHz, an input linearity range up to -20 dBm, a power consumption of 96 mW, and finally, it does not require external components.
{"title":"Fully integrated heterodyne RF receiver for ISM band applications","authors":"S. Di Pascoli, L. Fanucci, F. Giusti, B. Neri, D. Zito","doi":"10.1109/SCS.2003.1226964","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226964","url":null,"abstract":"A fully integrated RF single-conversion heterodyne receiver front-end for ISM band (2.44 GHz) wireless applications is presented. The circuit realizes a high image rejection by exploiting a band pass low noise amplifier and an image-reject mixer according to the Hartley architecture. The front-end has been designed on a 50 GHz cut-off frequency bipolar process. The main characteristics of this design are an overall image-rejection greater than 57 dB at 110 MHz of intermediate frequency, a transducer power gain of 32 dB, a bandwidth of 80 MHz, an input linearity range up to -20 dBm, a power consumption of 96 mW, and finally, it does not require external components.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133280555","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227123
D. Burdia, G. Grigore, C. Ionascu
In this paper, analytical expressions characterizing the output voltage, propagation delay and short-circuit energy dissipation of a CMOS inverter driving resistive interconnects are presented. The α-power law MOSFET model is used. A detailed analysis of the inverter operation is provided, which results in accurate expressions of the output response to an input ramp. The propagation delay is analytically calculated taking into account the coupling capacitance between input and output and the effect of the short-circuit current. In addition, the short-circuit energy dissipation is accurately estimated. Experimental results showed that our analytical expressions for propagation delay and short-circuit energy are in very good agreement with SPICE simulations.
{"title":"Delay and short-circuit power expressions characterizing a CMOS inverter driving resistive interconnect","authors":"D. Burdia, G. Grigore, C. Ionascu","doi":"10.1109/SCS.2003.1227123","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227123","url":null,"abstract":"In this paper, analytical expressions characterizing the output voltage, propagation delay and short-circuit energy dissipation of a CMOS inverter driving resistive interconnects are presented. The α-power law MOSFET model is used. A detailed analysis of the inverter operation is provided, which results in accurate expressions of the output response to an input ramp. The propagation delay is analytically calculated taking into account the coupling capacitance between input and output and the effect of the short-circuit current. In addition, the short-circuit energy dissipation is accurately estimated. Experimental results showed that our analytical expressions for propagation delay and short-circuit energy are in very good agreement with SPICE simulations.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"196 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132793466","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 : 2003-07-10DOI: 10.1109/SCS.2003.1226987
D. Neacşu
This paper introduces a new direct topology for AC/AC conversion with reduced passive components and extended output voltage range. Comparisons with usual solutions for three-phase to three-phase conversion are detailed. This converter topology is easy to be controlled with conventionally DSP systems.
{"title":"IGBT-based \"cycloconverters\" built of conventional current source inverter modules","authors":"D. Neacşu","doi":"10.1109/SCS.2003.1226987","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226987","url":null,"abstract":"This paper introduces a new direct topology for AC/AC conversion with reduced passive components and extended output voltage range. Comparisons with usual solutions for three-phase to three-phase conversion are detailed. This converter topology is easy to be controlled with conventionally DSP systems.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131207445","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227010
D. Truscan, S. Virtanen, J. Lilius
In this paper, we present our use of SystemC to simulate IPv6 router architecture on our TTA based protocol processor. Our approach makes it easy to verify the correct functionality and to identify performances bottlenecks in the architecture within a short time frame. All this is done prior to proceeding to synthesize the processor into hardware.
{"title":"SystemC simulation framework of protocol processing architectures for IPv6 routing","authors":"D. Truscan, S. Virtanen, J. Lilius","doi":"10.1109/SCS.2003.1227010","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227010","url":null,"abstract":"In this paper, we present our use of SystemC to simulate IPv6 router architecture on our TTA based protocol processor. Our approach makes it easy to verify the correct functionality and to identify performances bottlenecks in the architecture within a short time frame. All this is done prior to proceeding to synthesize the processor into hardware.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132338190","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 : 2003-07-10DOI: 10.1109/SCS.2003.1226971
C. Grava, V. Buzuloiu, A. Grava
In this paper, a comparative study of the motion estimation methods in image sequences is presented. These methods are used with the aim to obtain the movement information as a dense field of movement vectors. This information can be used after that spatio-temporal interpolation of image sequences. The considerations regarding the particularities of the motion estimation methods, as well as their disadvantages and some alternative solutions will be presented.
{"title":"Comparative study of motion estimation methods for spatio-temporal interpolation","authors":"C. Grava, V. Buzuloiu, A. Grava","doi":"10.1109/SCS.2003.1226971","DOIUrl":"https://doi.org/10.1109/SCS.2003.1226971","url":null,"abstract":"In this paper, a comparative study of the motion estimation methods in image sequences is presented. These methods are used with the aim to obtain the movement information as a dense field of movement vectors. This information can be used after that spatio-temporal interpolation of image sequences. The considerations regarding the particularities of the motion estimation methods, as well as their disadvantages and some alternative solutions will be presented.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115568147","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 : 2003-07-10DOI: 10.1109/SCS.2003.1227137
D. Cafagna, G. Grassi
This paper deals with dynamic properties and generation of new multi-scroll attractors in two coupled Chua's circuits with sine-type nonlinearities. In particular, the proposed approach enables hyperchaotic nxm-scroll attractor to be systematically generated by combining the chaotic n-scroll attractor related to the first circuit with the chaotic m-scroll attractor related to second circuit. Finally, some examples are reported to illustrate the capability of the proposed technique.
{"title":"Dynamic properties and generation of new hyperchaotic multi-scroll attractors","authors":"D. Cafagna, G. Grassi","doi":"10.1109/SCS.2003.1227137","DOIUrl":"https://doi.org/10.1109/SCS.2003.1227137","url":null,"abstract":"This paper deals with dynamic properties and generation of new multi-scroll attractors in two coupled Chua's circuits with sine-type nonlinearities. In particular, the proposed approach enables hyperchaotic nxm-scroll attractor to be systematically generated by combining the chaotic n-scroll attractor related to the first circuit with the chaotic m-scroll attractor related to second circuit. Finally, some examples are reported to illustrate the capability of the proposed technique.","PeriodicalId":375963,"journal":{"name":"Signals, Circuits and Systems, 2003. SCS 2003. International Symposium on","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116128130","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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