Pub Date : 1998-12-01DOI: 10.1109/CCECE.1998.685577
N. Prakash, A. Elkateeb
Integrated Services Digital Networks (ISDN) is an end-to-end digital telecommunications network providing the capability to transmit voice, data, facsimile, telemetry, signaling, and slow motion video. It provides a basic rate interface, 2B+D (2B for 2 bearer channels of 64 kbps each and D for delta channel of 16 kbps). It also provides primary rate interface 23B+D (1.544 Mbps equivalent to T1) in North America and 30B+D in Europe. In this paper we explore the use of narrowband ISDN for real-time applications in homes and small businesses. The paper concentrates on some real-time applications supported by the ISDN basic rate interface in homes and small businesses. In particular, ISDN LAP-D and call control protocols have been analyzed in detail, to support the real-time applications. High level scenarios, protocol message and bit level scenarios have been designed for the real-time applications.
{"title":"The use of ISDN signaling for real-time applications at homes and small businesses","authors":"N. Prakash, A. Elkateeb","doi":"10.1109/CCECE.1998.685577","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685577","url":null,"abstract":"Integrated Services Digital Networks (ISDN) is an end-to-end digital telecommunications network providing the capability to transmit voice, data, facsimile, telemetry, signaling, and slow motion video. It provides a basic rate interface, 2B+D (2B for 2 bearer channels of 64 kbps each and D for delta channel of 16 kbps). It also provides primary rate interface 23B+D (1.544 Mbps equivalent to T1) in North America and 30B+D in Europe. In this paper we explore the use of narrowband ISDN for real-time applications in homes and small businesses. The paper concentrates on some real-time applications supported by the ISDN basic rate interface in homes and small businesses. In particular, ISDN LAP-D and call control protocols have been analyzed in detail, to support the real-time applications. High level scenarios, protocol message and bit level scenarios have been designed for the real-time applications.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125452449","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 : 1998-05-24DOI: 10.1109/CCECE.1998.682730
D. Dodds, R. Mason, R. Schmitz, Anh Dinh, R. Bolton
This paper presents a segmented transversal matched filter (SMF) capable of performing code phase acquisition for a direct sequence spread spectrum (DS-SS) system in the presence of Doppler frequency shift and high co-user noise. Traditional acquisition methods such as serial search, sequential estimation, and I-Q matched filters are either too slow, incapable of overcoming high co-user noise, or unable to handle phase rotations due to Doppler shifts. The SMF has a high acquisition speed because it retains the signal history. A new code phase candidate can be tested as each new code chip is received. The segmentation of the SMF's correlation function allows it to handle several cycles of phase rotation caused by carrier frequency offset (Doppler). Presented here is a 512 bit, 16 segment (32 bits per segment) SMF implemented as a mixed analog/digital integrated circuit (IC). Several ICs may be cascaded to extend the effective filter length.
{"title":"A segmented matched filter for CDMA code phase acquisition","authors":"D. Dodds, R. Mason, R. Schmitz, Anh Dinh, R. Bolton","doi":"10.1109/CCECE.1998.682730","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682730","url":null,"abstract":"This paper presents a segmented transversal matched filter (SMF) capable of performing code phase acquisition for a direct sequence spread spectrum (DS-SS) system in the presence of Doppler frequency shift and high co-user noise. Traditional acquisition methods such as serial search, sequential estimation, and I-Q matched filters are either too slow, incapable of overcoming high co-user noise, or unable to handle phase rotations due to Doppler shifts. The SMF has a high acquisition speed because it retains the signal history. A new code phase candidate can be tested as each new code chip is received. The segmentation of the SMF's correlation function allows it to handle several cycles of phase rotation caused by carrier frequency offset (Doppler). Presented here is a 512 bit, 16 segment (32 bits per segment) SMF implemented as a mixed analog/digital integrated circuit (IC). Several ICs may be cascaded to extend the effective filter length.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114995811","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685574
A. Elfeitori, H. Alnuweiri
We address the issue of supporting isochronous ATM traffic (e.g., real time (RT) voice traffic) over IEEE 802.14 based hybrid fiber coaxial (HFC) access networks. We propose a network architecture for a multi-service HFC network that can be used to support multiple services such as voice telephony and Internet access. Also, we propose enhancements to the 802.14 medium access control (MAC) protocols to facilitate supporting isochronous asynchronous transfer mode (ATM) traffic over HFC networks. In particular, we propose enhancements to the constant bit rate (CBR) service of 802.14 MAC protocol. We show that good quality of service, and enhanced bandwidth utilization are achieved using the proposed scheme. Our proposal facilitates the migration towards end-to-end ATM networks.
{"title":"Supporting isochronous ATM traffic over IEEE 802.14 based HFC access networks","authors":"A. Elfeitori, H. Alnuweiri","doi":"10.1109/CCECE.1998.685574","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685574","url":null,"abstract":"We address the issue of supporting isochronous ATM traffic (e.g., real time (RT) voice traffic) over IEEE 802.14 based hybrid fiber coaxial (HFC) access networks. We propose a network architecture for a multi-service HFC network that can be used to support multiple services such as voice telephony and Internet access. Also, we propose enhancements to the 802.14 medium access control (MAC) protocols to facilitate supporting isochronous asynchronous transfer mode (ATM) traffic over HFC networks. In particular, we propose enhancements to the constant bit rate (CBR) service of 802.14 MAC protocol. We show that good quality of service, and enhanced bandwidth utilization are achieved using the proposed scheme. Our proposal facilitates the migration towards end-to-end ATM networks.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"1065 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123161812","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 : 1998-05-24DOI: 10.1109/CCECE.1998.682776
A.K. Gupta, Li Xin, L. O. Barbosa
We propose a novel scheduling scheme, in which a new user is admitted for service by a multimedia server only if the service requirements of all the existing users and the new user can be satisfied. Each user is assumed to be requesting a variable bit rate (VBR) MPEG2 encoded media stream. The scheduling scheme maximizes the number of streams that can be served concurrently. The quality of service is guaranteed in terms of the fraction of the frames that may be dropped for a user. When a new request arrives, the admission control algorithm estimates the fraction of frames that may have to be dropped for the users assuming that the new request is accepted. If the fraction of frames is more than the drop rate committed to the users, the request is rejected, otherwise it is accepted. Our scheme is much more simpler than the schemes suggested in the literature and results in better utilization of the resources, and at the same time provides guaranteed QoS to the users requesting predictive service. Extensive simulations have been conducted to demonstrate the effectiveness of this scheduling scheme.
{"title":"A novel scheduling scheme for serving VBR-encoded multimedia streams","authors":"A.K. Gupta, Li Xin, L. O. Barbosa","doi":"10.1109/CCECE.1998.682776","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682776","url":null,"abstract":"We propose a novel scheduling scheme, in which a new user is admitted for service by a multimedia server only if the service requirements of all the existing users and the new user can be satisfied. Each user is assumed to be requesting a variable bit rate (VBR) MPEG2 encoded media stream. The scheduling scheme maximizes the number of streams that can be served concurrently. The quality of service is guaranteed in terms of the fraction of the frames that may be dropped for a user. When a new request arrives, the admission control algorithm estimates the fraction of frames that may have to be dropped for the users assuming that the new request is accepted. If the fraction of frames is more than the drop rate committed to the users, the request is rejected, otherwise it is accepted. Our scheme is much more simpler than the schemes suggested in the literature and results in better utilization of the resources, and at the same time provides guaranteed QoS to the users requesting predictive service. Extensive simulations have been conducted to demonstrate the effectiveness of this scheduling scheme.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121339653","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 : 1998-05-24DOI: 10.1109/CCECE.1998.682711
S. H. Hosseini, M. T. Haque
Resonant converters are widely used in various branches of industry. These converters with a rectifier circuit at output stage can be used as a DC to DC converter. In this case, the control of DC voltage magnitude at the output is the most important factor in converter operation. On the other hand, as the switching frequency in these converters may be up to the range of megahertz, the subtraction of switching devices not only simplifies the control circuit, but also reduces the losses and cost. This paper presents a new power circuit for a parallel loaded resonant DC/DC converter (PLR) with only one controlled switching device. In this circuit the rectifier bridge is not necessary and use of a new switching pattern makes it possible to control the output voltage in a very simple manner.
{"title":"A new control scheme for parallel loaded DC/DC resonant converter using only one switching device","authors":"S. H. Hosseini, M. T. Haque","doi":"10.1109/CCECE.1998.682711","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682711","url":null,"abstract":"Resonant converters are widely used in various branches of industry. These converters with a rectifier circuit at output stage can be used as a DC to DC converter. In this case, the control of DC voltage magnitude at the output is the most important factor in converter operation. On the other hand, as the switching frequency in these converters may be up to the range of megahertz, the subtraction of switching devices not only simplifies the control circuit, but also reduces the losses and cost. This paper presents a new power circuit for a parallel loaded resonant DC/DC converter (PLR) with only one controlled switching device. In this circuit the rectifier bridge is not necessary and use of a new switching pattern makes it possible to control the output voltage in a very simple manner.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124859767","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685649
R. Macphie, I. Lian, T. Lo, A. Fong
This paper extends the classical problem of electromagnetic scattering of spherical conductors to the case of two coalescing spheres of different size. The incident field is a linearly polarized plane wave with arbitrary polarization angle /spl gamma/ and angle of incidence /spl alpha/. The scattered field is given in terms of multipole fields scattered from each sphere.
{"title":"Plane wave scattering by two coalescing spheres","authors":"R. Macphie, I. Lian, T. Lo, A. Fong","doi":"10.1109/CCECE.1998.685649","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685649","url":null,"abstract":"This paper extends the classical problem of electromagnetic scattering of spherical conductors to the case of two coalescing spheres of different size. The incident field is a linearly polarized plane wave with arbitrary polarization angle /spl gamma/ and angle of incidence /spl alpha/. The scattered field is given in terms of multipole fields scattered from each sphere.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"228 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116377272","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 : 1998-05-24DOI: 10.1109/CCECE.1998.682728
P. Zhou, O. Yang
Conventional ATM switches are usually port-oriented and they are designed to operate in the context of FIFO queueing. New ATM switches that are currently being developed will be traffic oriented. They will provide per-VC queueing and therefore they handle each traffic flow or connection separately. This paper presents the cell loss evaluation on a per-VC queueing architecture proposed by the authors.
{"title":"Cell loss analysis of per-VC queueing ATM switches","authors":"P. Zhou, O. Yang","doi":"10.1109/CCECE.1998.682728","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682728","url":null,"abstract":"Conventional ATM switches are usually port-oriented and they are designed to operate in the context of FIFO queueing. New ATM switches that are currently being developed will be traffic oriented. They will provide per-VC queueing and therefore they handle each traffic flow or connection separately. This paper presents the cell loss evaluation on a per-VC queueing architecture proposed by the authors.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116439919","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 : 1998-05-24DOI: 10.1109/CCECE.1998.682558
T. Nakashima, T. Niimura, K. Okada, R. Yokoyama, N. Okada
In this paper the authors present an evaluation of technical concerns that may arise from the deregulation of electric power systems, particularly including wheeling transactions. In the deregulation of the power industry, many independent power producers (IPPs) are seeking chances to be connected to the existing transmission systems under an open access environment. Some IPPs will sell power to existing utilities at a market price and others may participate in wheeling transactions with a third party, using the existing transmission system. This paper reports research about the impact of wheeling introduced in an existing electric power system. The evaluation of the impact on the existing utility power system is conducted by multiple perspectives such as: transmission loss, voltage profiles, and network congestion. Numerical analyses have been done on a standard IEEE power system. The optimal power flow was solved by varying the possible combinations of an IPP supplier and a customer load in wheeling transactions. The power output of the IPPs was assumed to be determined by an economic objective and therefore not controllable by the existing utility. The various numerical aspects were assessed based on the economic dispatch and AC load flow data.
{"title":"Multiple-impact assessment of wheeling and independent power producers in a de-regulated power system","authors":"T. Nakashima, T. Niimura, K. Okada, R. Yokoyama, N. Okada","doi":"10.1109/CCECE.1998.682558","DOIUrl":"https://doi.org/10.1109/CCECE.1998.682558","url":null,"abstract":"In this paper the authors present an evaluation of technical concerns that may arise from the deregulation of electric power systems, particularly including wheeling transactions. In the deregulation of the power industry, many independent power producers (IPPs) are seeking chances to be connected to the existing transmission systems under an open access environment. Some IPPs will sell power to existing utilities at a market price and others may participate in wheeling transactions with a third party, using the existing transmission system. This paper reports research about the impact of wheeling introduced in an existing electric power system. The evaluation of the impact on the existing utility power system is conducted by multiple perspectives such as: transmission loss, voltage profiles, and network congestion. Numerical analyses have been done on a standard IEEE power system. The optimal power flow was solved by varying the possible combinations of an IPP supplier and a customer load in wheeling transactions. The power output of the IPPs was assumed to be determined by an economic objective and therefore not controllable by the existing utility. The various numerical aspects were assessed based on the economic dispatch and AC load flow data.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123833423","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685537
Zaohong Yang, P. C. Sen
This paper presents a comprehensive review of various power factor correction techniques proposed for single phase AC-to-DC power converters. The topologies and voltage and current control systems of these approaches are addressed. Their advantages and disadvantages are outlined.
{"title":"Recent developments in high power factor switch-mode converters","authors":"Zaohong Yang, P. C. Sen","doi":"10.1109/CCECE.1998.685537","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685537","url":null,"abstract":"This paper presents a comprehensive review of various power factor correction techniques proposed for single phase AC-to-DC power converters. The topologies and voltage and current control systems of these approaches are addressed. Their advantages and disadvantages are outlined.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"188 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121316699","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 : 1998-05-24DOI: 10.1109/CCECE.1998.685610
R. Rifaat, W. Kinsner, P. McAlpine
This paper presents a multifractal analsyis technique for deoxyribonucleic acid (DNA). A brief overview of sequencing and multifractal measures is given along with multifractal spectrum data. Fractal characterization is shown to have high potential as a valuable tool in DNA analysis. Consideration is given to selecting the appropriate fractal measure, probability measure and operational parameters. A multifractal trajectory over a moving window is given for possible use in classification. The DNA sequences of Methanococcus janaschii and Escherichia coli are shown to exhibit multifractal properties which vary significantly over trajectories calculated from each individual base type.
{"title":"Multifractal analysis of DNA","authors":"R. Rifaat, W. Kinsner, P. McAlpine","doi":"10.1109/CCECE.1998.685610","DOIUrl":"https://doi.org/10.1109/CCECE.1998.685610","url":null,"abstract":"This paper presents a multifractal analsyis technique for deoxyribonucleic acid (DNA). A brief overview of sequencing and multifractal measures is given along with multifractal spectrum data. Fractal characterization is shown to have high potential as a valuable tool in DNA analysis. Consideration is given to selecting the appropriate fractal measure, probability measure and operational parameters. A multifractal trajectory over a moving window is given for possible use in classification. The DNA sequences of Methanococcus janaschii and Escherichia coli are shown to exhibit multifractal properties which vary significantly over trajectories calculated from each individual base type.","PeriodicalId":177613,"journal":{"name":"Conference Proceedings. IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.98TH8341)","volume":"16 23‐24","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113955403","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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