Pub Date : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686241
M. Bousbia-Salah, M. Fezari
An Electronic Travel Aid is a form of assistive technology having the purpose of enhancing mobility for blind individuals. This paper examines a pedestrian navigation system for the Blind, which is based on a microcontroller with synthetic speech output. This aid is a portable, self contained system that will allow blind people to travel without the assistance of guides. It is designed for a battery-powered portable model. In addition, it is focused on low power consumption, small size, lightweight, and easy manipulation. The proposed system provides information to the user about urban walking routes using spoken words to indicate what decisions to make.
{"title":"The Development of a pedestrian navigation aid for the blind","authors":"M. Bousbia-Salah, M. Fezari","doi":"10.1109/IEEEGCC.2006.5686241","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686241","url":null,"abstract":"An Electronic Travel Aid is a form of assistive technology having the purpose of enhancing mobility for blind individuals. This paper examines a pedestrian navigation system for the Blind, which is based on a microcontroller with synthetic speech output. This aid is a portable, self contained system that will allow blind people to travel without the assistance of guides. It is designed for a battery-powered portable model. In addition, it is focused on low power consumption, small size, lightweight, and easy manipulation. The proposed system provides information to the user about urban walking routes using spoken words to indicate what decisions to make.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126829910","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686184
S. Razavi, M. Khalaj‐Amirhosseini
In this paper the use of double-layers walls for shielded enclosures is proposed to increase the shielding effectiveness of them. The effect of distance between two layers and the offset between two apertures in the shielding effectiveness is investigated. The usefulness of inserting a box between two layers around apertures is also presented. To analyze enclosures with double-layers wall, the eigenvector expansion and the Bethe's approximation have been used.
{"title":"Investigating shielded enclosures with double-layers walls","authors":"S. Razavi, M. Khalaj‐Amirhosseini","doi":"10.1109/IEEEGCC.2006.5686184","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686184","url":null,"abstract":"In this paper the use of double-layers walls for shielded enclosures is proposed to increase the shielding effectiveness of them. The effect of distance between two layers and the offset between two apertures in the shielding effectiveness is investigated. The usefulness of inserting a box between two layers around apertures is also presented. To analyze enclosures with double-layers wall, the eigenvector expansion and the Bethe's approximation have been used.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127224461","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686171
Mohamed Deriche, Daryl Ning
The paper presents a novel bitstream scalable audio coder. In the proposed coder, the full bandwidth of input audio is first split into two. A hybrid WLPC-wavelet representation is used to encode the low frequency components (<; 11 kHz). In this method, the excitation to the WLPC synthesis filter is decomposed into subbands using a wavelet filterbank, and perceptually encoded. Two stage quantisation of the wavelet coefficients is used to provide scalability. The high frequency components of the input are assumed to be noisy, and efficiently encoded using an LPC noise model. The output bitstream can be decoded at rates between 16 kbps and 70 kbps. As the bitrate increases, so too does the signal quality. At 70 kbps, the quality is near transparent. At the intermediate rates, the coder gives comparable performance to the MPEG layer III coder, when the MPEG coder operates at a similar (but fixed) bitrate.
{"title":"A novel scalable audio coder based on warped linear prediction and the wavelet transform","authors":"Mohamed Deriche, Daryl Ning","doi":"10.1109/IEEEGCC.2006.5686171","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686171","url":null,"abstract":"The paper presents a novel bitstream scalable audio coder. In the proposed coder, the full bandwidth of input audio is first split into two. A hybrid WLPC-wavelet representation is used to encode the low frequency components (<; 11 kHz). In this method, the excitation to the WLPC synthesis filter is decomposed into subbands using a wavelet filterbank, and perceptually encoded. Two stage quantisation of the wavelet coefficients is used to provide scalability. The high frequency components of the input are assumed to be noisy, and efficiently encoded using an LPC noise model. The output bitstream can be decoded at rates between 16 kbps and 70 kbps. As the bitrate increases, so too does the signal quality. At 70 kbps, the quality is near transparent. At the intermediate rates, the coder gives comparable performance to the MPEG layer III coder, when the MPEG coder operates at a similar (but fixed) bitrate.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125534106","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686253
R. W. Brown
Thin film capacitors typically degrade in use by exhibiting much increased dissipation factors and nominal capacitance values that fall off steeply with frequency. The cause of the increased loss is poorly explained in the literature and is often inferred to be probably due to changes in the properties of the dielectric film. However, it can be shown that the increase in losses can almost entirely be attributed to increased losses in the metal film due to increased path lengths brought on principally by corrosion. Further, the modification of the path lengths can result in localized heating and sporadic fusing of vestigial links during operation, greatly increasing the risk of catastrophic failure. Measurement and teardown inspection of degraded capacitors provide strong support for theoretical modeling involving the critical role of corrosion in capacitor degradation and failure.
{"title":"A dominant mechanism for thin film power capacitors going high or self-destructing","authors":"R. W. Brown","doi":"10.1109/IEEEGCC.2006.5686253","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686253","url":null,"abstract":"Thin film capacitors typically degrade in use by exhibiting much increased dissipation factors and nominal capacitance values that fall off steeply with frequency. The cause of the increased loss is poorly explained in the literature and is often inferred to be probably due to changes in the properties of the dielectric film. However, it can be shown that the increase in losses can almost entirely be attributed to increased losses in the metal film due to increased path lengths brought on principally by corrosion. Further, the modification of the path lengths can result in localized heating and sporadic fusing of vestigial links during operation, greatly increasing the risk of catastrophic failure. Measurement and teardown inspection of degraded capacitors provide strong support for theoretical modeling involving the critical role of corrosion in capacitor degradation and failure.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116497746","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686195
K. Khan, A. Sheikh
An Ad Hoc network results from a cooperative engagement of a collection of mobile nodes without requiring any intervention of any centralized access point. The term ad hoc means that the network structure in not permanent but it can take different forms depending on the task it needs to perform. An ad hoc on-demand routing protocol starts with route discovery procedure from a source to a destination. In this paper, we propose a bandwidth efficient routing protocol called Bandwidth efficient GRID (B-GRID).
Ad Hoc网络由移动节点集合的协作接合产生，而不需要任何集中接入点的任何干预。“特设”一词意味着网络结构不是永久的，但它可以根据需要执行的任务采取不同的形式。自组织按需路由协议从源到目的的路由发现过程开始。在本文中，我们提出了一种带宽高效路由协议，称为带宽高效网格(B-GRID)。
{"title":"B-GRID: Location aware bandwidth efficient routing protocol for wireless ad hoc networks","authors":"K. Khan, A. Sheikh","doi":"10.1109/IEEEGCC.2006.5686195","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686195","url":null,"abstract":"An Ad Hoc network results from a cooperative engagement of a collection of mobile nodes without requiring any intervention of any centralized access point. The term ad hoc means that the network structure in not permanent but it can take different forms depending on the task it needs to perform. An ad hoc on-demand routing protocol starts with route discovery procedure from a source to a destination. In this paper, we propose a bandwidth efficient routing protocol called Bandwidth efficient GRID (B-GRID).","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133867351","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686209
M. Moinuddin, A. Zerguine
This paper presents a new wavelet transform domain least mean fourth (LMF) algorithm. The algorithm exploits the special sparse structure of the wavelet transform of wide classes of correlation matrices and their Cholesky factors in order to compute a whitening transformation of the input data in the wavelet domain and minimize computational complexity. This method explicitly computes a sparse estimate of the wavelet domain correlation matrix of the input process. It then computes the Cholesky factor of that matrix and uses its inverse to whiten the input. The proposed algorithm has faster convergence rate than that of wavelet transform domain least mean square (LMS) algorithm.
{"title":"Cholesky factors based wavelet transform domain LMF algorithm","authors":"M. Moinuddin, A. Zerguine","doi":"10.1109/IEEEGCC.2006.5686209","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686209","url":null,"abstract":"This paper presents a new wavelet transform domain least mean fourth (LMF) algorithm. The algorithm exploits the special sparse structure of the wavelet transform of wide classes of correlation matrices and their Cholesky factors in order to compute a whitening transformation of the input data in the wavelet domain and minimize computational complexity. This method explicitly computes a sparse estimate of the wavelet domain correlation matrix of the input process. It then computes the Cholesky factor of that matrix and uses its inverse to whiten the input. The proposed algorithm has faster convergence rate than that of wavelet transform domain least mean square (LMS) algorithm.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133089991","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686200
A. Al-Dweik
In this work, a new generalized approach is proposed to evaluate the probability of error performance of communication systems in the presence of interference. The interference can be intentional such as multitone jamming, or non-intentional such as multiple access interference or co-channel interference. As an example, the new approach is applied to compute the exact probability of error for a frequency hopping spread spectrum system with noncoherently demodulated M-ary amplitude shift keying signal in the presence of multitone jamming and white Gaussian noise.
{"title":"A new generalized approach for performance evaluation of communication systems with intentional/non-intentional jamming","authors":"A. Al-Dweik","doi":"10.1109/IEEEGCC.2006.5686200","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686200","url":null,"abstract":"In this work, a new generalized approach is proposed to evaluate the probability of error performance of communication systems in the presence of interference. The interference can be intentional such as multitone jamming, or non-intentional such as multiple access interference or co-channel interference. As an example, the new approach is applied to compute the exact probability of error for a frequency hopping spread spectrum system with noncoherently demodulated M-ary amplitude shift keying signal in the presence of multitone jamming and white Gaussian noise.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133412627","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686224
M. Saleh, M. A. Abido
The main objective of this paper is to investigate the enhancement of power system stability via coordinated design of Thyristor Controlled Series Compensation (TCSC) and Power System Stabilizers (PSSs) in multimachine power system. The design problem of the proposed controllers is formulated as an optimization problem. Using the developed linearized power system model, the particle swarm optimization (PSO) algorithm is employed to search for optimal controllers' parameters settings that maximize the minimum damping ratio of all system eigenvalues. The proposed controller is evaluated on a multimachine power system. The nonlinear simulation results and eigenvalue analysis show the effectiveness of the proposed controller in damping power system oscillations.
{"title":"Power system damping enhancement via coordinated design of PSS & TCSC in multimachine power system","authors":"M. Saleh, M. A. Abido","doi":"10.1109/IEEEGCC.2006.5686224","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686224","url":null,"abstract":"The main objective of this paper is to investigate the enhancement of power system stability via coordinated design of Thyristor Controlled Series Compensation (TCSC) and Power System Stabilizers (PSSs) in multimachine power system. The design problem of the proposed controllers is formulated as an optimization problem. Using the developed linearized power system model, the particle swarm optimization (PSO) algorithm is employed to search for optimal controllers' parameters settings that maximize the minimum damping ratio of all system eigenvalues. The proposed controller is evaluated on a multimachine power system. The nonlinear simulation results and eigenvalue analysis show the effectiveness of the proposed controller in damping power system oscillations.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128933601","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686192
F. Tavassoli, B. Abolhassani, H. Oraizi
A new adaptive beamforming method for direct sequence code division multiple access (DS-CDMA) communication systems is proposed, which has low computational load. The proposed method needs only 2N+1 complex multiplications and 2N-1 complex additions, where N is the number of antennas in the array. We evaluate the performance of the proposed method in estimating the angle-of-arrival (AOA) of the desired signal and in producing the array beam pattern. Moreover, the performance of the proposed method in alleviating the probability of bit error in both fading and non-fading channel is verified. It is observed that although the proposed method has low computational load, nevertheless it has desirable performance.
{"title":"A new eigen decomposition based algorithm for beamforming in CDMA communication systems","authors":"F. Tavassoli, B. Abolhassani, H. Oraizi","doi":"10.1109/IEEEGCC.2006.5686192","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686192","url":null,"abstract":"A new adaptive beamforming method for direct sequence code division multiple access (DS-CDMA) communication systems is proposed, which has low computational load. The proposed method needs only 2N+1 complex multiplications and 2N-1 complex additions, where N is the number of antennas in the array. We evaluate the performance of the proposed method in estimating the angle-of-arrival (AOA) of the desired signal and in producing the array beam pattern. Moreover, the performance of the proposed method in alleviating the probability of bit error in both fading and non-fading channel is verified. It is observed that although the proposed method has low computational load, nevertheless it has desirable performance.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127619581","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686186
A. AlQahtani Salman, S. Ashraf
Radio resource management (RRM) in the next generation wireless network system will have features and requirements that are quite distinct from current systems, mostly designed for non-heterogeneous and non-shared networks. Such features include radio resource sharing which is considered as one of the main future issues of RRM as network evolves towards 4G Radio resource sharing has an impact on system design in general and on radio resource management in particular. This paper presents a general RRM for 3G and beyond mobile wireless network supporting multi-services, referred to as general call admission control (GCAC). The aim of the proposed GCAC algorithm is to guarantee the required quality of service (QoS) and to maintain higher resource utilization. Simulation results indicate that the proposed GCAC provides higher resource utilization under all load conditions leading in turn to increased revenue. In addition, a higher quality of service for traffic is provided especially when we differentiate between the traffic classes.
{"title":"Radio resource management issues for 3G and beyond cellular wireless networks","authors":"A. AlQahtani Salman, S. Ashraf","doi":"10.1109/IEEEGCC.2006.5686186","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686186","url":null,"abstract":"Radio resource management (RRM) in the next generation wireless network system will have features and requirements that are quite distinct from current systems, mostly designed for non-heterogeneous and non-shared networks. Such features include radio resource sharing which is considered as one of the main future issues of RRM as network evolves towards 4G Radio resource sharing has an impact on system design in general and on radio resource management in particular. This paper presents a general RRM for 3G and beyond mobile wireless network supporting multi-services, referred to as general call admission control (GCAC). The aim of the proposed GCAC algorithm is to guarantee the required quality of service (QoS) and to maintain higher resource utilization. Simulation results indicate that the proposed GCAC provides higher resource utilization under all load conditions leading in turn to increased revenue. In addition, a higher quality of service for traffic is provided especially when we differentiate between the traffic classes.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117060905","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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