Pub Date : 1991-12-02DOI: 10.1109/GLOCOM.1991.188678
T. Finegan, A. Hunwicks
The authors describe a statistical approach to modeling the performance of optical networks in the local loop. A quantitative discussion is given on the advantages of a statistical modeling technique over the previously used worst-case analysis. Validation of the predicted results is shown by a comparison with measured trial network values. Model results are shown to determine the most efficient use of network and system components.<>
{"title":"A statistical approach to modelling the network performance of fibre-in-the-loop systems","authors":"T. Finegan, A. Hunwicks","doi":"10.1109/GLOCOM.1991.188678","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188678","url":null,"abstract":"The authors describe a statistical approach to modeling the performance of optical networks in the local loop. A quantitative discussion is given on the advantages of a statistical modeling technique over the previously used worst-case analysis. Validation of the predicted results is shown by a comparison with measured trial network values. Model results are shown to determine the most efficient use of network and system components.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124101283","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188547
P. C. Wong
A fixed frame-based distributed queue dual bus (FB-DQDB) medium access protocol was previously proposed (P.C. Wong, 1991) for gigabit-per-second local and metropolitan area networks (LANs and MANs). This protocol allows each station to transmit a number of consecutive slots up to the limit of a frame size. The protocol is extended by allowing the headend to modify the frame size dynamically according to the request traffic. The new dynamic frame-based DQDB protocol (DF-DQDB) can therefore give a better throughput performance for variable size messages. Various performance aspects of this protocol are studied through simulation.<>
{"title":"A dynamic frame-based DQDB protocol for Gbit/s local and metropolitan area networks","authors":"P. C. Wong","doi":"10.1109/GLOCOM.1991.188547","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188547","url":null,"abstract":"A fixed frame-based distributed queue dual bus (FB-DQDB) medium access protocol was previously proposed (P.C. Wong, 1991) for gigabit-per-second local and metropolitan area networks (LANs and MANs). This protocol allows each station to transmit a number of consecutive slots up to the limit of a frame size. The protocol is extended by allowing the headend to modify the frame size dynamically according to the request traffic. The new dynamic frame-based DQDB protocol (DF-DQDB) can therefore give a better throughput performance for variable size messages. Various performance aspects of this protocol are studied through simulation.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126470490","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188490
J. Hélard, B. Le Floch
The combination of an orthogonal frequency division multiplexing (OFDM) technique and a coding scheme is seen as a promising broadcasting system to cope with the frequency-selective and time-variant channel. The first application of this technique using a convolutional coding scheme has been implemented within the framework of the Eureka DAB (digital audio broadcasting) project. It is shown how to double the existing spectrum efficiency of the system with the association of trellis-coded modulation and an orthogonal frequency-division multiplexing technique with the aim of offering the transmission capacity in a TV channel necessary for a high-quality video signal.<>
{"title":"Trellis coded orthogonal frequency division multiplexing for digital video transmission","authors":"J. Hélard, B. Le Floch","doi":"10.1109/GLOCOM.1991.188490","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188490","url":null,"abstract":"The combination of an orthogonal frequency division multiplexing (OFDM) technique and a coding scheme is seen as a promising broadcasting system to cope with the frequency-selective and time-variant channel. The first application of this technique using a convolutional coding scheme has been implemented within the framework of the Eureka DAB (digital audio broadcasting) project. It is shown how to double the existing spectrum efficiency of the system with the association of trellis-coded modulation and an orthogonal frequency-division multiplexing technique with the aim of offering the transmission capacity in a TV channel necessary for a high-quality video signal.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"2000 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125726013","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188626
P. Fines, A. Aghvami
A 16-ary differentially encoded quadrature amplitude modulation (16-DEQAM) demodulator for medium- and high-bit-rate (from 2 Mb/s to 100 Mb/s) land mobile satellite communication is proposed, and its performance is evaluated. The digital synchronization and digital detection techniques used in this system are described. The hardware speed limitations have been overcome effectively with extensive use of lookup tables and concurrent digital signal processing on a polar signal representation. The bit error rate (BER) performance was evaluated by computer simulation over additive white Gaussian noise (AWGN) and Rician fading channels.<>
{"title":"A new 16-ary QAM demodulator for medium and high data rate services","authors":"P. Fines, A. Aghvami","doi":"10.1109/GLOCOM.1991.188626","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188626","url":null,"abstract":"A 16-ary differentially encoded quadrature amplitude modulation (16-DEQAM) demodulator for medium- and high-bit-rate (from 2 Mb/s to 100 Mb/s) land mobile satellite communication is proposed, and its performance is evaluated. The digital synchronization and digital detection techniques used in this system are described. The hardware speed limitations have been overcome effectively with extensive use of lookup tables and concurrent digital signal processing on a polar signal representation. The bit error rate (BER) performance was evaluated by computer simulation over additive white Gaussian noise (AWGN) and Rician fading channels.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122232850","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188535
M. Szwarc
A technique is presented to satisfy the demand for customized user service through virtual private data networks (VPDN). It is reported that VPDN allows the creation and management of software defined private networks within the confines of the wide-area network (WAN). This solution is economically advantageous to customers because these private networks do not require capital investment in communication equipment. Its flexibility allows service providers to quickly introduce customized network environments. Virtual private data networks are secure, simple to manage, and easy-to-use.<>
{"title":"Virtual private data network service in the wide area networks","authors":"M. Szwarc","doi":"10.1109/GLOCOM.1991.188535","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188535","url":null,"abstract":"A technique is presented to satisfy the demand for customized user service through virtual private data networks (VPDN). It is reported that VPDN allows the creation and management of software defined private networks within the confines of the wide-area network (WAN). This solution is economically advantageous to customers because these private networks do not require capital investment in communication equipment. Its flexibility allows service providers to quickly introduce customized network environments. Virtual private data networks are secure, simple to manage, and easy-to-use.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133993006","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188722
G. Moichelitsch
The author presents a prototype system designed to support distributed work groups. The system is based on a communication concept that integrates synchronous and asynchronous communication modes. The user interface was implemented based on the room metaphor, which provides users with one simple mechanism for communication, regardless of the type of media and communication mode. As for the types of media, text, graphics, image, voice, and video are supported. The author focuses on the room metaphor and its implementation with special attention paid to video related issues.<>
{"title":"Providing a shared environment to distributed work groups","authors":"G. Moichelitsch","doi":"10.1109/GLOCOM.1991.188722","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188722","url":null,"abstract":"The author presents a prototype system designed to support distributed work groups. The system is based on a communication concept that integrates synchronous and asynchronous communication modes. The user interface was implemented based on the room metaphor, which provides users with one simple mechanism for communication, regardless of the type of media and communication mode. As for the types of media, text, graphics, image, voice, and video are supported. The author focuses on the room metaphor and its implementation with special attention paid to video related issues.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134181096","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188574
K. A. Aly, P. Dowd
A photonic fast packet switch is proposed for low-latency intra-node routing in high-speed optical networks. Applications are demonstrated in telecommunication and parallel computer environments. The switch fabric is based on integrated directional-coupler technology. It has low complexity and is geometrically suitable for real-estate efficient single-substrate implementation. The switching architecture relies on time division multiplexing an optically coupled tree-structured active routing stage. Both synchronous and asynchronous TDM operation modes are modeled and analyzed to obtain packet buffering and total switching latencies.<>
{"title":"A photonic fast packet switch for high-speed intra-node routing: architecture and delay analysis","authors":"K. A. Aly, P. Dowd","doi":"10.1109/GLOCOM.1991.188574","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188574","url":null,"abstract":"A photonic fast packet switch is proposed for low-latency intra-node routing in high-speed optical networks. Applications are demonstrated in telecommunication and parallel computer environments. The switch fabric is based on integrated directional-coupler technology. It has low complexity and is geometrically suitable for real-estate efficient single-substrate implementation. The switching architecture relies on time division multiplexing an optically coupled tree-structured active routing stage. Both synchronous and asynchronous TDM operation modes are modeled and analyzed to obtain packet buffering and total switching latencies.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131840999","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188451
R. Diaz de la Iglesia, E. Lope Oter, M. Martínez
The authors consider technical options aimed at enhancing the reliability and availability of fiber-based local access connections (between local exchange and customer premises). Attention is paid both to point-to-point business connections and to point-to-multipoint fiber to the curb residential connections. The various alternatives are compared from the end-to-end channel availability point of view. The specific values regarding failure rates and times-to-repair come from experience gained within Telefonica's fiber network. Detailed Markov diagrams are given, making possible the evaluation of the effects that other figures of failure rates and times to repair would have on availability. The alternatives assessed include: connections with terminal-multiplexer redundancy; connections with terminal-multiplexers and cable-path redundancy; and connections with cable-path redundancy engineered with advanced photonic switching devices.<>
{"title":"Performance of technical options to enhance reliability and availability in fibre-based local access connections","authors":"R. Diaz de la Iglesia, E. Lope Oter, M. Martínez","doi":"10.1109/GLOCOM.1991.188451","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188451","url":null,"abstract":"The authors consider technical options aimed at enhancing the reliability and availability of fiber-based local access connections (between local exchange and customer premises). Attention is paid both to point-to-point business connections and to point-to-multipoint fiber to the curb residential connections. The various alternatives are compared from the end-to-end channel availability point of view. The specific values regarding failure rates and times-to-repair come from experience gained within Telefonica's fiber network. Detailed Markov diagrams are given, making possible the evaluation of the effects that other figures of failure rates and times to repair would have on availability. The alternatives assessed include: connections with terminal-multiplexer redundancy; connections with terminal-multiplexers and cable-path redundancy; and connections with cable-path redundancy engineered with advanced photonic switching devices.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130916946","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188655
A. K. Choudhury, V.O.K. Li
The authors investigate the effect of contention resolution (CR) rules on the performance of deflection routing. A new livelock-free prioritized CR rule, which is based on a packet's distance to the destination and the number of deflections suffered by it, is proposed. The performance-in terms of the average throughput, the average network delay and the delay distribution-of this CR rule is compared with those of other commonly used CR rules. Results show that prioritized CR rules improve the performance in networks using unbuffered deflection routing. It is observed that prioritized CR rules have hardly any effect on the performance of buffered deflection routing. These results suggest that using the random CR rule with output buffers is a better way to improve the performance than implementing complicated CR rules which sacrifice the switching speed inherent in deflection routing.<>
{"title":"Effect of contention resolution rules on the performance of deflection routing","authors":"A. K. Choudhury, V.O.K. Li","doi":"10.1109/GLOCOM.1991.188655","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188655","url":null,"abstract":"The authors investigate the effect of contention resolution (CR) rules on the performance of deflection routing. A new livelock-free prioritized CR rule, which is based on a packet's distance to the destination and the number of deflections suffered by it, is proposed. The performance-in terms of the average throughput, the average network delay and the delay distribution-of this CR rule is compared with those of other commonly used CR rules. Results show that prioritized CR rules improve the performance in networks using unbuffered deflection routing. It is observed that prioritized CR rules have hardly any effect on the performance of buffered deflection routing. These results suggest that using the random CR rule with output buffers is a better way to improve the performance than implementing complicated CR rules which sacrifice the switching speed inherent in deflection routing.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133047866","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 : 1991-12-02DOI: 10.1109/GLOCOM.1991.188509
N. Srivastava, S. Rappaport
Several models are presented for overlapping coverage areas based on hexagonal, square and linear layouts of cells. Mixtures of these arrangements, as well as less regular configurations, are likely to arise as cellular and microcellular systems are deployed in high-density communication traffic areas and along roadways. For each layout, the fraction of total area that is covered by a given number of fixed sites is determined and plotted as a function of transceiver range.<>
{"title":"Models for overlapping coverage areas in cellular and micro-cellular communication systems","authors":"N. Srivastava, S. Rappaport","doi":"10.1109/GLOCOM.1991.188509","DOIUrl":"https://doi.org/10.1109/GLOCOM.1991.188509","url":null,"abstract":"Several models are presented for overlapping coverage areas based on hexagonal, square and linear layouts of cells. Mixtures of these arrangements, as well as less regular configurations, are likely to arise as cellular and microcellular systems are deployed in high-density communication traffic areas and along roadways. For each layout, the fraction of total area that is covered by a given number of fixed sites is determined and plotted as a function of transceiver range.<<ETX>>","PeriodicalId":343080,"journal":{"name":"IEEE Global Telecommunications Conference GLOBECOM '91: Countdown to the New Millennium. Conference Record","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132573877","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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