Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296500
M. Djendi, A. Guessoum, A. Benallal, M. Bouchard
In this paper, we present new versions of the fast RLS adaptive algorithm. These versions are based on a combination of the block filtering technique and a use of a scalar accelerator parameter in each block. These mixing techniques lead a faster convergence of the fast RLS algorithm and behave better with time-varying acoustic systems. The proposed versions have approximately the same complexity of calculation than the original version of the fast RLS algorithm. The difference between this work and the previous ones (Benallal A. et al., Jan 1989) is the use of a new combination techniques which provide new forms of the fast RLS prediction part. All the proposed versions and their simulations results are presented.
在本文中，我们提出了快速RLS自适应算法的新版本。这些版本基于块过滤技术和在每个块中使用标量加速器参数的组合。这些混合技术使得快速RLS算法收敛速度更快，并且在时变声学系统中表现更好。提出的版本与原始版本的快速RLS算法具有大致相同的计算复杂度。本工作与之前的工作(Benallal a . et al.， Jan 1989)的不同之处在于使用了一种新的组合技术，提供了快速RLS预测部分的新形式。给出了所有提出的版本及其仿真结果。
{"title":"New combinatorial methods for the improvement of the convergence speed and the tracking ability of the fast stable RLS adaptive algorithm","authors":"M. Djendi, A. Guessoum, A. Benallal, M. Bouchard","doi":"10.1109/ISCCSP.2004.1296500","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296500","url":null,"abstract":"In this paper, we present new versions of the fast RLS adaptive algorithm. These versions are based on a combination of the block filtering technique and a use of a scalar accelerator parameter in each block. These mixing techniques lead a faster convergence of the fast RLS algorithm and behave better with time-varying acoustic systems. The proposed versions have approximately the same complexity of calculation than the original version of the fast RLS algorithm. The difference between this work and the previous ones (Benallal A. et al., Jan 1989) is the use of a new combination techniques which provide new forms of the fast RLS prediction part. All the proposed versions and their simulations results are presented.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121555891","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296509
J. H. Husøy, M. Abadi
The recursive least squares (RLS) algorithm has established itself as the "ultimate" adaptive filtering algorithm in the sense that it is the adaptive filter exhibiting the best convergence behavior. Unfortunately, practical implementations of the algorithm are often associated with high computational complexity and/or poor numerical properties. Rather than focusing on full RLS algorithm implementations aiming directly at remedying these problems, we argue that the use of simplified or partial RLS algorithms may be a viable alternative to full RLS. In particular, we point out that two recently introduced algorithms, fast Euclidian direction search (FEDS) and recursive adaptive matching pursuit (RAMP) can indeed be interpreted as such partial RLS algorithms exhibiting a nice tradeoff between complexity and performance. We support our presentation by a comprehensive set of simulation results.
{"title":"A comparative study of some simplified RLS-type algorithms","authors":"J. H. Husøy, M. Abadi","doi":"10.1109/ISCCSP.2004.1296509","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296509","url":null,"abstract":"The recursive least squares (RLS) algorithm has established itself as the \"ultimate\" adaptive filtering algorithm in the sense that it is the adaptive filter exhibiting the best convergence behavior. Unfortunately, practical implementations of the algorithm are often associated with high computational complexity and/or poor numerical properties. Rather than focusing on full RLS algorithm implementations aiming directly at remedying these problems, we argue that the use of simplified or partial RLS algorithms may be a viable alternative to full RLS. In particular, we point out that two recently introduced algorithms, fast Euclidian direction search (FEDS) and recursive adaptive matching pursuit (RAMP) can indeed be interpreted as such partial RLS algorithms exhibiting a nice tradeoff between complexity and performance. We support our presentation by a comprehensive set of simulation results.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114847809","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296262
N. Tabbane, Sami Tabbane, Ahmed. Mehaoua
In this paper, we try to reduce the degree of QoS degradation while enhancing at the same time the estimation of the quality of service of the networks. We shall present methods for forecasting resources to meet the QoS requirements for real-time service support based on autoregressive integrated moving average processes: ARIMA combined with the ad hoc routing protocol: DSR. These processes provide a range of models, stationary and non-stationary, that adequately represent many of the time QoS variations. The results obtained (in terms of throughputs and end-to-end delays) show that the combination of the DSR protocol with the time QoS forecasting, based on ARIMA processes, performs better than conventional DSR.
{"title":"Non stationary stochastic models for forecasting QoS in ad hoc networks for real-time service support","authors":"N. Tabbane, Sami Tabbane, Ahmed. Mehaoua","doi":"10.1109/ISCCSP.2004.1296262","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296262","url":null,"abstract":"In this paper, we try to reduce the degree of QoS degradation while enhancing at the same time the estimation of the quality of service of the networks. We shall present methods for forecasting resources to meet the QoS requirements for real-time service support based on autoregressive integrated moving average processes: ARIMA combined with the ad hoc routing protocol: DSR. These processes provide a range of models, stationary and non-stationary, that adequately represent many of the time QoS variations. The results obtained (in terms of throughputs and end-to-end delays) show that the combination of the DSR protocol with the time QoS forecasting, based on ARIMA processes, performs better than conventional DSR.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126471849","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296215
A. Boudraa, J. Cexus, F. Salzenstein, L. Guillon
In this paper, a method based on the empirical mode decomposition (EMD) algorithm and Teager energy operator (TEO) is proposed to estimate the instantaneous frequency (IF) of a signal embedded in noise. IF is used to describe a signal's frequency that varies with time. Both EMD and TEO deal with non-stationary signals. The signal is first band pass filtered into subsignals (components) called intrinsic mode functions (IMFs) with well defined IF. Each IMF is a zero-mean AM-FM component. Then TEO tracks the modulation energy of each IMF and estimates the corresponding IF. In order to show the effectiveness of the proposed method, results of IF estimation of noisy AM-FM signals are proposed.
{"title":"IF estimation using empirical mode decomposition and nonlinear Teager energy operator","authors":"A. Boudraa, J. Cexus, F. Salzenstein, L. Guillon","doi":"10.1109/ISCCSP.2004.1296215","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296215","url":null,"abstract":"In this paper, a method based on the empirical mode decomposition (EMD) algorithm and Teager energy operator (TEO) is proposed to estimate the instantaneous frequency (IF) of a signal embedded in noise. IF is used to describe a signal's frequency that varies with time. Both EMD and TEO deal with non-stationary signals. The signal is first band pass filtered into subsignals (components) called intrinsic mode functions (IMFs) with well defined IF. Each IMF is a zero-mean AM-FM component. Then TEO tracks the modulation energy of each IMF and estimates the corresponding IF. In order to show the effectiveness of the proposed method, results of IF estimation of noisy AM-FM signals are proposed.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125611419","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296309
S. Trautmann, N. Fliege
The use of a cyclic prefix in discrete multitone (DMT)-based transmission systems to prevent intersymbol and interchannel interference (ISI/ICI) becomes a significant design drawback for short-latency systems with short symbol lengths. We propose a new generalized DMT (GDMT) scheme which allows to shift the necessary redundancy for ISI/ICI compensation either part-wise or even completely to the frequency domain. Therewith, we can achieve the shortest possible latency for a given DFT length. We have shown that GDMT offers the same, if not better, performance at about the same complexity compared to the traditional DMT solution.
{"title":"Low-latency multicarrier transmission using generalized DMT modulation","authors":"S. Trautmann, N. Fliege","doi":"10.1109/ISCCSP.2004.1296309","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296309","url":null,"abstract":"The use of a cyclic prefix in discrete multitone (DMT)-based transmission systems to prevent intersymbol and interchannel interference (ISI/ICI) becomes a significant design drawback for short-latency systems with short symbol lengths. We propose a new generalized DMT (GDMT) scheme which allows to shift the necessary redundancy for ISI/ICI compensation either part-wise or even completely to the frequency domain. Therewith, we can achieve the shortest possible latency for a given DFT length. We have shown that GDMT offers the same, if not better, performance at about the same complexity compared to the traditional DMT solution.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122010894","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296231
M. Maamoun, A. Benbelkacem, D. Berkani
A new architecture for generating video signal using computer and microprocessor-based system is presented. This architecture uses a new interfacing technique for the data transfer from the microprocessor-based system to our video memory. This technique is based on the use of extended physical addressing or fast physical addressing which is aimed to reduce the use of physical addresses in microprocessor-based system. Furthermore, it improves the data transfer speed. The proposed system combines a software/hardware solution to obtain the above advantages and uses digital-to-analog conversion (DAC) in the output stage.
{"title":"Video signal generation using a new interfacing technique for computer system","authors":"M. Maamoun, A. Benbelkacem, D. Berkani","doi":"10.1109/ISCCSP.2004.1296231","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296231","url":null,"abstract":"A new architecture for generating video signal using computer and microprocessor-based system is presented. This architecture uses a new interfacing technique for the data transfer from the microprocessor-based system to our video memory. This technique is based on the use of extended physical addressing or fast physical addressing which is aimed to reduce the use of physical addresses in microprocessor-based system. Furthermore, it improves the data transfer speed. The proposed system combines a software/hardware solution to obtain the above advantages and uses digital-to-analog conversion (DAC) in the output stage.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127965870","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296471
H. Gabzili, Z. Lachiri, N. Ellouze
A standard approach to automatic speech recognition uses HMM whose state dependent distributions are Gaussian mixtures models. In this paper we evaluate experimentally on the automatic word recognition performance, the effect of different hidden Markov models (HMM) by varying the number of state and the number of Gaussian mixture per state. We evaluate the different models with different coding techniques: linear predictive cepstral coefficients, Mel frequency cepstral and perceptual linear predictive coefficients combined with the first derivate coefficient known as the delta coefficients, in aim to built a reference word recognition system. The system is performed using the HTK 3.1 toolkit.
{"title":"Experimental study of the HMMs effect on the word recognition performance","authors":"H. Gabzili, Z. Lachiri, N. Ellouze","doi":"10.1109/ISCCSP.2004.1296471","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296471","url":null,"abstract":"A standard approach to automatic speech recognition uses HMM whose state dependent distributions are Gaussian mixtures models. In this paper we evaluate experimentally on the automatic word recognition performance, the effect of different hidden Markov models (HMM) by varying the number of state and the number of Gaussian mixture per state. We evaluate the different models with different coding techniques: linear predictive cepstral coefficients, Mel frequency cepstral and perceptual linear predictive coefficients combined with the first derivate coefficient known as the delta coefficients, in aim to built a reference word recognition system. The system is performed using the HTK 3.1 toolkit.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121438558","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296288
T. Hentschel
Modern radio terminals for high data rate communication require wideband receivers. The well-known receiver architectures, such as zero-IF-receivers usually require very accurate component matching. In order to relax these requirements digital techniques are used on one side. On the other side alternative receiver architectures such as the six-port are investigated. The six-port has been introduced as a very flexible and elegant means for microwave measurements in the 1960s and 1970s. Later on it has been used in radar applications. It was not until recently that communication receivers have been built upon the six-port principle. In order to generate the required IQ-signal from the output signals of a six-port, knowledge of the six-port structure and/or of the signal statistics must be available. The first can be obtained by means of calibration procedures, while the latter can be used in blind techniques. Classical calibration procedures employ probes that are connected to the six-port. This is not applicable in communication receivers. Alternatively, a method is presented that uses the incoming signal as the calibration-driving probe and moreover uses the fact that the I-component and the Q-component of the signal are uncorrelated in most practical scenarios.
{"title":"A simple IQ-regeneration technique for six-port communication receivers","authors":"T. Hentschel","doi":"10.1109/ISCCSP.2004.1296288","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296288","url":null,"abstract":"Modern radio terminals for high data rate communication require wideband receivers. The well-known receiver architectures, such as zero-IF-receivers usually require very accurate component matching. In order to relax these requirements digital techniques are used on one side. On the other side alternative receiver architectures such as the six-port are investigated. The six-port has been introduced as a very flexible and elegant means for microwave measurements in the 1960s and 1970s. Later on it has been used in radar applications. It was not until recently that communication receivers have been built upon the six-port principle. In order to generate the required IQ-signal from the output signals of a six-port, knowledge of the six-port structure and/or of the signal statistics must be available. The first can be obtained by means of calibration procedures, while the latter can be used in blind techniques. Classical calibration procedures employ probes that are connected to the six-port. This is not applicable in communication receivers. Alternatively, a method is presented that uses the incoming signal as the calibration-driving probe and moreover uses the fact that the I-component and the Q-component of the signal are uncorrelated in most practical scenarios.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121747394","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296224
A. Matera, F. D. De Natale
A novel post processing method for error concealment in video sequences is presented. The proposed approach tracks the contours in the area surrounding the damaged blocks, by using the information available at previously decoded frames. Tracking is performed in two steps: first a coarse estimation of the position is achieved through motion compensation and then, the matching is refined using snakes. The snakes and the relevant texture information are then extrapolated in the lost area to conceal it. Experimental results show that the proposed method allows achieving seamless reconstruction of large picture losses.
{"title":"Video error concealment using spatio-temporal interpolation with snakes","authors":"A. Matera, F. D. De Natale","doi":"10.1109/ISCCSP.2004.1296224","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296224","url":null,"abstract":"A novel post processing method for error concealment in video sequences is presented. The proposed approach tracks the contours in the area surrounding the damaged blocks, by using the information available at previously decoded frames. Tracking is performed in two steps: first a coarse estimation of the position is achieved through motion compensation and then, the matching is refined using snakes. The snakes and the relevant texture information are then extrapolated in the lost area to conceal it. Experimental results show that the proposed method allows achieving seamless reconstruction of large picture losses.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115832502","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296220
P. Banelli, L. Rugini
Multicarrier systems are highly sensitive to the intermodulation distortion (IMD) introduced by high-power amplifiers (HPA) at the transmitter and to the intercarrier interference (ICI) due to a carrier frequency offset (CFO) at the receiver. We analyze the bit-error rate (BER) degradation induced by these impairments in the downlink of a multi-carrier direct-sequence code-division multiple-access (MC-DS-CDMA) systems in frequency-selective Rayleigh fading channels.
{"title":"BER performance degradation of MC-DS-CDMA systems jointly affected by transmitter HPA and receiver CFO in frequency selective fading channels","authors":"P. Banelli, L. Rugini","doi":"10.1109/ISCCSP.2004.1296220","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296220","url":null,"abstract":"Multicarrier systems are highly sensitive to the intermodulation distortion (IMD) introduced by high-power amplifiers (HPA) at the transmitter and to the intercarrier interference (ICI) due to a carrier frequency offset (CFO) at the receiver. We analyze the bit-error rate (BER) degradation induced by these impairments in the downlink of a multi-carrier direct-sequence code-division multiple-access (MC-DS-CDMA) systems in frequency-selective Rayleigh fading channels.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133972082","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：