Pub Date : 2007-12-01DOI: 10.1109/WISP.2007.4447581
S. Boscolo, J.D. Ania-Castaon
All-optical data processing is expected to play a major role in future optical communications. Nonlinear effects in optical fibers have attractive applications in optical signal processing. In this paper, we review our recent advances in developing all-optical processing techniques at high speed based on optical fiber nonlinearities.
{"title":"Recent Developments in All-Optical Nonlinear Signal Processing for Fiber-Optic Communications","authors":"S. Boscolo, J.D. Ania-Castaon","doi":"10.1109/WISP.2007.4447581","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447581","url":null,"abstract":"All-optical data processing is expected to play a major role in future optical communications. Nonlinear effects in optical fibers have attractive applications in optical signal processing. In this paper, we review our recent advances in developing all-optical processing techniques at high speed based on optical fiber nonlinearities.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126495532","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 : 2007-10-05DOI: 10.1109/WISP.2007.4447607
J. R. Gonzalez, C. Bleakley
This paper proposes a novel hybrid Time of Arrival (ToA) and Angle of Arrival (AoA) based system for 3D indoor location using ultrasonic spread spectrum signals. The proposed system differs from previously proposed hybrid systems in several ways - the mobile devices determines its own position, the consequent orientation problem is solved and the system uses spread spectrum techniques to improve robustness to noise and multipath. The system uses an inclinometer to allow the mobile to determine its own position. This paper compares the performance of the proposed hybrid system with that of a conventional ToA- only system. The hybrid system is found to reduce the number of base stations needed for 3D location of the mobile device, from three to two, and to provide more accurate location estimates under conditions of typical noise and room reverberation.
{"title":"Robust Ultrasonic Spread-Spectrum Positioning System using a AoA/ToA Method","authors":"J. R. Gonzalez, C. Bleakley","doi":"10.1109/WISP.2007.4447607","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447607","url":null,"abstract":"This paper proposes a novel hybrid Time of Arrival (ToA) and Angle of Arrival (AoA) based system for 3D indoor location using ultrasonic spread spectrum signals. The proposed system differs from previously proposed hybrid systems in several ways - the mobile devices determines its own position, the consequent orientation problem is solved and the system uses spread spectrum techniques to improve robustness to noise and multipath. The system uses an inclinometer to allow the mobile to determine its own position. This paper compares the performance of the proposed hybrid system with that of a conventional ToA- only system. The hybrid system is found to reduce the number of base stations needed for 3D location of the mobile device, from three to two, and to provide more accurate location estimates under conditions of typical noise and room reverberation.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123149304","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 : 2007-10-04DOI: 10.1109/WISP.2007.4447492
Carlos E. Ag¨uero, Antonio L. Gonz´alez, Francisco Mart´ın, Vicente Matell´an
Perception problem in robotics has been usually faced from the individual perspective, in this work we present preliminary results of a shared perception mechanism for a group of legged robots working in a dynamic scenario. The experiments has been conducted using a group of aiBo robots in the RoboCup environment. Each individual robot has its own perception of a common interesting feature, the ball, and they altogether build a shared perception.
{"title":"Distributed perception for a group of legged robots","authors":"Carlos E. Ag¨uero, Antonio L. Gonz´alez, Francisco Mart´ın, Vicente Matell´an","doi":"10.1109/WISP.2007.4447492","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447492","url":null,"abstract":"Perception problem in robotics has been usually faced from the individual perspective, in this work we present preliminary results of a shared perception mechanism for a group of legged robots working in a dynamic scenario. The experiments has been conducted using a group of aiBo robots in the RoboCup environment. Each individual robot has its own perception of a common interesting feature, the ball, and they altogether build a shared perception.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126859933","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447550
Javier González, J. Blanco, C. Galindo, A. Ortiz-de-Galisteo, J. Fernández-Madrigal, F. Moreno, Jorge L. Martínez
GPS receivers are satellite-based devices widely used for vehicle localization that, given their limitations, are not suitable for performing within indoor or dense urban environments. On the other hand ultra-wide band (UWB), a technology used for efficient wireless communication, has recently being used for vehicle localization in indoor environments with promising results. This paper focuses on the combination of both technologies for accurate positioning of vehicles in a mixed scenario (both indoor and outdoor situations), which is typical in some industrial applications. Our approach is based on combining sensor information in a Monte Carlo localization algorithm (also known as particle Filter), which has revealed its suitability for probabilistically coping with a variety of sensory data. The performance of our approach has been satisfactorily tested on a real robot, endowed with a UWB master antenna and a GPS receiver, within an indoor-outdoor scenario where three UWB slave antennas were placed in the indoor area.
{"title":"Combination of UWB and GPS for indoor-outdoor vehicle localization","authors":"Javier González, J. Blanco, C. Galindo, A. Ortiz-de-Galisteo, J. Fernández-Madrigal, F. Moreno, Jorge L. Martínez","doi":"10.1109/WISP.2007.4447550","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447550","url":null,"abstract":"GPS receivers are satellite-based devices widely used for vehicle localization that, given their limitations, are not suitable for performing within indoor or dense urban environments. On the other hand ultra-wide band (UWB), a technology used for efficient wireless communication, has recently being used for vehicle localization in indoor environments with promising results. This paper focuses on the combination of both technologies for accurate positioning of vehicles in a mixed scenario (both indoor and outdoor situations), which is typical in some industrial applications. Our approach is based on combining sensor information in a Monte Carlo localization algorithm (also known as particle Filter), which has revealed its suitability for probabilistically coping with a variety of sensory data. The performance of our approach has been satisfactorily tested on a real robot, endowed with a UWB master antenna and a GPS receiver, within an indoor-outdoor scenario where three UWB slave antennas were placed in the indoor area.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115655953","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447576
M. Tresanchez, T. Pallejà, M. Teixidó, J. Palacín
Floor cleaning is a typical mobile robot application. Most commercial cleaning mobile robots designed for domestic applications use random path-planning algorithms and very few sensors and the critical problem is to decide when the cleaning is already finished or the coverage completed. In this paper, we propose some methods to estimate the size of the cleaning area using only the information of encoders and collision detectors. To this end, three typical rooms have been tested with and without furniture. Results show the great influence of furniture distribution in the estimation of the area of the room. Average estimation errors under plusmn20% can be expected for empty rooms and from 0% to -70% in the case of rooms with furniture.
{"title":"Estimating a room size using encoders and collision detectors: application to a cleaning mobile robot","authors":"M. Tresanchez, T. Pallejà, M. Teixidó, J. Palacín","doi":"10.1109/WISP.2007.4447576","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447576","url":null,"abstract":"Floor cleaning is a typical mobile robot application. Most commercial cleaning mobile robots designed for domestic applications use random path-planning algorithms and very few sensors and the critical problem is to decide when the cleaning is already finished or the coverage completed. In this paper, we propose some methods to estimate the size of the cleaning area using only the information of encoders and collision detectors. To this end, three typical rooms have been tested with and without furniture. Results show the great influence of furniture distribution in the estimation of the area of the room. Average estimation errors under plusmn20% can be expected for empty rooms and from 0% to -70% in the case of rooms with furniture.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125259147","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447505
G. Vagliasindi, A. Murari, P. Arena, L. Fortuna, G. Mazzitelli
In modern tokamaks visible and infrared video cameras are becoming more and more important to monitor plasma evolution during fusion experiments. Analyzing these images in real-time can provide relevant information for controlling the plasma and the safety of the machines. The realtime image processing capability of Cellular Nonlinear Network based chip has been applied to several tasks both at the Frascati Tokamak Upgrade and the Joint European Torus.
{"title":"Application of Cellular Neural Network Methods to Real Time Image Analysis in Plasma Fusion","authors":"G. Vagliasindi, A. Murari, P. Arena, L. Fortuna, G. Mazzitelli","doi":"10.1109/WISP.2007.4447505","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447505","url":null,"abstract":"In modern tokamaks visible and infrared video cameras are becoming more and more important to monitor plasma evolution during fusion experiments. Analyzing these images in real-time can provide relevant information for controlling the plasma and the safety of the machines. The realtime image processing capability of Cellular Nonlinear Network based chip has been applied to several tasks both at the Frascati Tokamak Upgrade and the Joint European Torus.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122775749","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447628
M. Oltean, M. Nafornita
Recent work has shown that the use of wavelets in a data transmission chain brings several advantages. Thus, the wavelet mothers and the associated scale functions can generate orthogonal basis that obey Nyquist's first criterion and these basis can be used as pulse shaping waveforms instead of raised cosine filters. Furthermore, robust multicarrier data transmission can be performed using wavelet carriers instead of the classical sine waves proposed by OFDM. By associating these benefits, the road towards new powerful transmission techniques in data transmission systems is widely opened.
{"title":"Efficient Pulse Shaping and Robust Data Transmission Using Wavelets","authors":"M. Oltean, M. Nafornita","doi":"10.1109/WISP.2007.4447628","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447628","url":null,"abstract":"Recent work has shown that the use of wavelets in a data transmission chain brings several advantages. Thus, the wavelet mothers and the associated scale functions can generate orthogonal basis that obey Nyquist's first criterion and these basis can be used as pulse shaping waveforms instead of raised cosine filters. Furthermore, robust multicarrier data transmission can be performed using wavelet carriers instead of the classical sine waves proposed by OFDM. By associating these benefits, the road towards new powerful transmission techniques in data transmission systems is widely opened.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129843344","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447497
M. Moura, L. Moura, A. Leiria
Spectral resolution may be enhanced by calculation of the analytic version of the signals processed. In this paper an open issue in the spectral estimation of Doppler ultrasound blood flow signals is addressed: when should the analytic signal representation be obtained and how to achieve such a representation. A comparison of the impact of two alternatives for achieving such a representation is reported. This is done by comparing the statistical performance of the short time Fourier transform on the estimation of mean frequency and bandwidth of simulated Doppler ultrasound blood flow signals. The comparison evaluates two approaches to obtain the analytic signal representation, one in the frequency domain -the common Fourier transform based approach - and one in the time domain - using a FIR filter with small latency that approximates the Hilbert transform. The results obtained show that the "analytic" signal should be used before the estimation process and that, in most cases, the use of the FIR filter diminishes the estimation error.
{"title":"Comparison of Analytic Signal Usage on Doppler Blood Flow Signals Estimation","authors":"M. Moura, L. Moura, A. Leiria","doi":"10.1109/WISP.2007.4447497","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447497","url":null,"abstract":"Spectral resolution may be enhanced by calculation of the analytic version of the signals processed. In this paper an open issue in the spectral estimation of Doppler ultrasound blood flow signals is addressed: when should the analytic signal representation be obtained and how to achieve such a representation. A comparison of the impact of two alternatives for achieving such a representation is reported. This is done by comparing the statistical performance of the short time Fourier transform on the estimation of mean frequency and bandwidth of simulated Doppler ultrasound blood flow signals. The comparison evaluates two approaches to obtain the analytic signal representation, one in the frequency domain -the common Fourier transform based approach - and one in the time domain - using a FIR filter with small latency that approximates the Hilbert transform. The results obtained show that the \"analytic\" signal should be used before the estimation process and that, in most cases, the use of the FIR filter diminishes the estimation error.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129135558","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447542
P. Ferreira, A. Ruano
On-line learning algorithms are needed when the process to be modeled is time-varying or when it is impossible to obtain off-line data that covers the whole operating region. To minimize the problems of parameter shadowing and interference, sliding-based algorithms are used. It is shown that, by using a sliding window policy that enforces the novelty of data stored in the sliding window, and by using a procedure to prevent unnecessary parameter updates, the performance achieved is improved over a FIFO policy with fixed parameter updates. Important savings in computational effort are also obtained.
{"title":"On-line sliding-window Levenberg-Marquardt methods for neural network models","authors":"P. Ferreira, A. Ruano","doi":"10.1109/WISP.2007.4447542","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447542","url":null,"abstract":"On-line learning algorithms are needed when the process to be modeled is time-varying or when it is impossible to obtain off-line data that covers the whole operating region. To minimize the problems of parameter shadowing and interference, sliding-based algorithms are used. It is shown that, by using a sliding window policy that enforces the novelty of data stored in the sliding window, and by using a procedure to prevent unnecessary parameter updates, the performance achieved is improved over a FIFO policy with fixed parameter updates. Important savings in computational effort are also obtained.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114624191","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 : 2007-10-01DOI: 10.1109/WISP.2007.4447635
R. Vicen-Bueno, R. Gil-Pita, M. Utrilla-Manso, L. Álvarez-Pérez
This paper deals with the description of a hearing aid simulation tool. This tool simulates the real behavior of digital DSP-based hearing aids with the aim of getting a very promising performance, which can be used for further design and research, and for a better fitting of the hearing impaired patient. The main parameters to program are the noise reduction techniques and the compression and feedback reduction algorithms. Also any other configuration is possible due to the access to the simulated signals in the hearing aid. So we can get a very promising performance which can be used for further design and research and for a better fitting of the hearing impaired patient. Results using a multilevel multifrequency hearing aid with real data collected from 18 patients show how the multifrequency compression techniques adapt the normal perceptible sounds to the hearing impaired patient perceiving area.
{"title":"A hearing aid simulator to test adaptive signal processing algorithms","authors":"R. Vicen-Bueno, R. Gil-Pita, M. Utrilla-Manso, L. Álvarez-Pérez","doi":"10.1109/WISP.2007.4447635","DOIUrl":"https://doi.org/10.1109/WISP.2007.4447635","url":null,"abstract":"This paper deals with the description of a hearing aid simulation tool. This tool simulates the real behavior of digital DSP-based hearing aids with the aim of getting a very promising performance, which can be used for further design and research, and for a better fitting of the hearing impaired patient. The main parameters to program are the noise reduction techniques and the compression and feedback reduction algorithms. Also any other configuration is possible due to the access to the simulated signals in the hearing aid. So we can get a very promising performance which can be used for further design and research and for a better fitting of the hearing impaired patient. Results using a multilevel multifrequency hearing aid with real data collected from 18 patients show how the multifrequency compression techniques adapt the normal perceptible sounds to the hearing impaired patient perceiving area.","PeriodicalId":164902,"journal":{"name":"2007 IEEE International Symposium on Intelligent Signal Processing","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126525856","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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