Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296491
M. Kouraichi, B. Belghith O, A. Kachouri, L. Kamoun
The convolutional encoding with the Viterbi decoding algorithm represents one of the most popular techniques for direct error correction in the communication systems (forward error correction: FEC). This decoding technique has been proposed by A. Viterbi, it is based on maximum likelihood theory. The modification of this algorithm by introducing the soft value on the Viterbi algorithm makes it SOVA algorithm (soft output Viterbi algorithm), this modification gives the algorithm the possibility of quantifying the values of the received bits, so it will give more precise estimation of the decoded bit. The performance of the decoder will be from far more reliable.
{"title":"Evaluation of SOVA algorithm in turbo code","authors":"M. Kouraichi, B. Belghith O, A. Kachouri, L. Kamoun","doi":"10.1109/ISCCSP.2004.1296491","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296491","url":null,"abstract":"The convolutional encoding with the Viterbi decoding algorithm represents one of the most popular techniques for direct error correction in the communication systems (forward error correction: FEC). This decoding technique has been proposed by A. Viterbi, it is based on maximum likelihood theory. The modification of this algorithm by introducing the soft value on the Viterbi algorithm makes it SOVA algorithm (soft output Viterbi algorithm), this modification gives the algorithm the possibility of quantifying the values of the received bits, so it will give more precise estimation of the decoded bit. The performance of the decoder will be from far more reliable.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"24 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":"115982590","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.2004.1296216
A. Belouchrani, K. Abed-Meraim
This paper introduces new source separation techniques exploiting the time frequency signatures of the source signals. The proposed approach relies on time frequency distributions (TFD). Two TFD-based contrast functions are presented for non stationary sources. Iterative algorithms using the relative gradient technique are used to optimize the proposed contrast functions and perform the source separation.
{"title":"Contrast functions for blind source separation based on time frequency distributions","authors":"A. Belouchrani, K. Abed-Meraim","doi":"10.1109/ISCCSP.2004.1296216","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296216","url":null,"abstract":"This paper introduces new source separation techniques exploiting the time frequency signatures of the source signals. The proposed approach relies on time frequency distributions (TFD). Two TFD-based contrast functions are presented for non stationary sources. Iterative algorithms using the relative gradient technique are used to optimize the proposed contrast functions and perform the source separation.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"30 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":"132598720","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.2004.1296493
M. Valkama, R. Porat, F. Harris
Synchronization is a key issue in any digital communication system. In this paper, the problem of frequency offset estimation is addressed in detail, with focus on receiver design in the presence of narrowband interference. The basic idea is to use correlation properties of periodic training sequence combined with proper windowing for interference rejection. The performance of the proposed frequency offset estimator is analyzed using computer simulations and shown to be robust in the face of considered interference scenarios.
{"title":"On frequency offset estimation in the presence of narrowband interference","authors":"M. Valkama, R. Porat, F. Harris","doi":"10.1109/ISCCSP.2004.1296493","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296493","url":null,"abstract":"Synchronization is a key issue in any digital communication system. In this paper, the problem of frequency offset estimation is addressed in detail, with focus on receiver design in the presence of narrowband interference. The basic idea is to use correlation properties of periodic training sequence combined with proper windowing for interference rejection. The performance of the proposed frequency offset estimator is analyzed using computer simulations and shown to be robust in the face of considered interference scenarios.","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":"130832175","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.2004.1296428
D. Emir, E. Mohamed, B. Ammar
Efficient use of network resources while satisfying the QoS (quality of service) required by the multimedia traffics represents one of the major issues in modern network engineering problems. This paper, presents a statistical approach for traffic modeling and queuing performance analysis based on real traffic measurements. The approach can be seen as an combination and application of results issued from the areas of queuing theory and signal processing: collect of statistic from real traffics, effect of traffic high-order statistics on queue response and computational methods for queuing analysis [San-Qi Li and Chia-lin Hwang, Dec 1993], [Melamed, B and Tsiolis, A.K., 1996], [Sheng, H.D. and Li, S.Q., 1993], [San-qi Li and Chia-lin Hwang, Feb 1997], [Jingdog Ye and San-qi Li, Feb. 1994]. A numerical study applied to two traffic traces would be presented to show the validity of the approach.
{"title":"Network performance evaluation using traffic measurements","authors":"D. Emir, E. Mohamed, B. Ammar","doi":"10.1109/ISCCSP.2004.1296428","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296428","url":null,"abstract":"Efficient use of network resources while satisfying the QoS (quality of service) required by the multimedia traffics represents one of the major issues in modern network engineering problems. This paper, presents a statistical approach for traffic modeling and queuing performance analysis based on real traffic measurements. The approach can be seen as an combination and application of results issued from the areas of queuing theory and signal processing: collect of statistic from real traffics, effect of traffic high-order statistics on queue response and computational methods for queuing analysis [San-Qi Li and Chia-lin Hwang, Dec 1993], [Melamed, B and Tsiolis, A.K., 1996], [Sheng, H.D. and Li, S.Q., 1993], [San-qi Li and Chia-lin Hwang, Feb 1997], [Jingdog Ye and San-qi Li, Feb. 1994]. A numerical study applied to two traffic traces would be presented to show the validity of the approach.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"97 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":"130898852","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.2004.1296339
M. J. Canet, F. Vicedo, J. Valls, V. Almenar
This paper deals with the implementation issues of a digital transmitter for OFDM based WLAN systems. We explore different solutions for signal generation in baseband and in intermediate frequency taking into account the effect of the analog conversion in the overall performance. In order to minimize distortion of the cyclic prefix a new interpolation filter structure valid for OFDM signals is presented. Finally, the cost in area for FPGA implementation of every needed circuit is given.
{"title":"Design of a digital front-end transmitter for OFDM-WLAN systems using FPGA","authors":"M. J. Canet, F. Vicedo, J. Valls, V. Almenar","doi":"10.1109/ISCCSP.2004.1296339","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296339","url":null,"abstract":"This paper deals with the implementation issues of a digital transmitter for OFDM based WLAN systems. We explore different solutions for signal generation in baseband and in intermediate frequency taking into account the effect of the analog conversion in the overall performance. In order to minimize distortion of the cyclic prefix a new interpolation filter structure valid for OFDM signals is presented. Finally, the cost in area for FPGA implementation of every needed circuit is given.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"1 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":"131280727","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.2004.1296211
Azeddine Beghdadi
It is generally acknowledged that the image quality measures based or inspired by some findings on the human visual system (HVS) mechanisms are more appealing than classical measures such as the PSNR or MSE. Many HVS-based image quality assessment methods have been previously proposed. However, because of the complexity and the influence of the great number of observation parameters on the HVS-based image quality metrics there is no standard measure yet. In this paper, the image distortion metric proposed in A. Beghdadi et al. (2003) is reviewed and some improvements are suggested. This metric makes use of the joint spatial/spatial-frequency representation and applies a relatively simple nonlinear energy detection procedure. This simple distortion measure does not take into account any well-established model for the masking effect. The consistency of the proposed measure with subjective human evaluation is demonstrated on some standard image distortions.
{"title":"Design of an image distortion measure using spatial/spatial-frequency analysis","authors":"Azeddine Beghdadi","doi":"10.1109/ISCCSP.2004.1296211","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296211","url":null,"abstract":"It is generally acknowledged that the image quality measures based or inspired by some findings on the human visual system (HVS) mechanisms are more appealing than classical measures such as the PSNR or MSE. Many HVS-based image quality assessment methods have been previously proposed. However, because of the complexity and the influence of the great number of observation parameters on the HVS-based image quality metrics there is no standard measure yet. In this paper, the image distortion metric proposed in A. Beghdadi et al. (2003) is reviewed and some improvements are suggested. This metric makes use of the joint spatial/spatial-frequency representation and applies a relatively simple nonlinear energy detection procedure. This simple distortion measure does not take into account any well-established model for the masking effect. The consistency of the proposed measure with subjective human evaluation is demonstrated on some standard image distortions.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"14 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":"126862969","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.2004.1296318
Ling Cen, Y. Lian
In the ASIC implementation, a long FIR filter can operate at high speed without pipelining if it is factorized into several short filters whose coefficients are in the form of the sum of signed powers-of-two terms. Such implementation reduces the hardware cost and lowers the power consumption significantly as it requires no multipliers. This paper presents a filter synthesis method that factorizes a long filter into several short filters and quantizes the coefficients of all short filters into signed powers-of-two values simultaneously using micro-genetic algorithm (/spl mu/GA). The proposed /spl mu/GA speeds up the optimization process greatly compared to conventional GA.
{"title":"Complexity reduction of high-speed FIR filters using micro-genetic algorithm","authors":"Ling Cen, Y. Lian","doi":"10.1109/ISCCSP.2004.1296318","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296318","url":null,"abstract":"In the ASIC implementation, a long FIR filter can operate at high speed without pipelining if it is factorized into several short filters whose coefficients are in the form of the sum of signed powers-of-two terms. Such implementation reduces the hardware cost and lowers the power consumption significantly as it requires no multipliers. This paper presents a filter synthesis method that factorizes a long filter into several short filters and quantizes the coefficients of all short filters into signed powers-of-two values simultaneously using micro-genetic algorithm (/spl mu/GA). The proposed /spl mu/GA speeds up the optimization process greatly compared to conventional GA.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"5 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113933023","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.2004.1296289
A. B. Aicha, F. Tlili, S. B. Jebara
Wavelet packet division multiplexing (WPDM), in which the message signals are waveform coded onto wavelet packet basis function, is a promising technique for multiple signals transmission. It was proposed in order to ensure better transmission quality in hostile environments. In this paper, we enrich previous studies by analyzing the peak to average power ratio (PAPR.) criterion. A procedure based on best wavelet packet basis function selection and different users mapping is then proposed in order to decrease the PAPR. Some simulations are carried to support the analysis.
{"title":"PAPR analysis and reduction in WPDM systems","authors":"A. B. Aicha, F. Tlili, S. B. Jebara","doi":"10.1109/ISCCSP.2004.1296289","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296289","url":null,"abstract":"Wavelet packet division multiplexing (WPDM), in which the message signals are waveform coded onto wavelet packet basis function, is a promising technique for multiple signals transmission. It was proposed in order to ensure better transmission quality in hostile environments. In this paper, we enrich previous studies by analyzing the peak to average power ratio (PAPR.) criterion. A procedure based on best wavelet packet basis function selection and different users mapping is then proposed in order to decrease the PAPR. Some simulations are carried to support the analysis.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"38 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114014075","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.2004.1296450
Hans-Andrea Loeliger, J. Dauwels, Volker M. Koch, S. Korl
Graphical models such as factor graphs allow to model complex systems and help to derive practical detection/estimation algorithms as message passing in the graph. In this paper, we outline three examples of on-going work of this type. For an introduction to factor graphs, we refer to F. R. Kschischang (Feb. 2001) and H. A. Loeliger (Jan. 2004). We use the notation of H. A. Loeliger (Jan. 2004).
诸如因子图之类的图形模型允许对复杂系统进行建模，并帮助推导出在图中传递消息的实用检测/估计算法。在本文中，我们概述了这类正在进行的工作的三个例子。对于因子图的介绍，我们参考了f.r. Kschischang(2001年2月)和h.a. Loeliger(2004年1月)。我们使用H. A. Loeliger (Jan. 2004)的符号。
{"title":"Signal processing with factor graphs: examples","authors":"Hans-Andrea Loeliger, J. Dauwels, Volker M. Koch, S. Korl","doi":"10.1109/ISCCSP.2004.1296450","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296450","url":null,"abstract":"Graphical models such as factor graphs allow to model complex systems and help to derive practical detection/estimation algorithms as message passing in the graph. In this paper, we outline three examples of on-going work of this type. For an introduction to factor graphs, we refer to F. R. Kschischang (Feb. 2001) and H. A. Loeliger (Jan. 2004). We use the notation of H. A. Loeliger (Jan. 2004).","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"6 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":"124030296","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.2004.1296282
K. Cheikh, S. Faozi
The radar signal detection is a very complex task, which is generally based on conventional statistical methods. These methods require a lot of computing and they are optimal only for one type of clutter distribution. Recently, artificial neural networks (ANN) have been used as a means of signal detection. In this paper, we consider the problem of radar signal detection using ANN in a K-distributed environment. Two training algorithms are tested; namely, the back propagation (BP) and genetic algorithms (AG) for a MLP architecture. The simulation results have shown that the MLP architecture outperforms the classical CA-CFAR detector.
{"title":"Application of neural networks to radar signal detection in K-distributed clutter","authors":"K. Cheikh, S. Faozi","doi":"10.1109/ISCCSP.2004.1296282","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296282","url":null,"abstract":"The radar signal detection is a very complex task, which is generally based on conventional statistical methods. These methods require a lot of computing and they are optimal only for one type of clutter distribution. Recently, artificial neural networks (ANN) have been used as a means of signal detection. In this paper, we consider the problem of radar signal detection using ANN in a K-distributed environment. Two training algorithms are tested; namely, the back propagation (BP) and genetic algorithms (AG) for a MLP architecture. The simulation results have shown that the MLP architecture outperforms the classical CA-CFAR detector.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"38 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":"117074416","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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