The authors consider some electric selective repeat automatic repeat request (ARQ) schemes suitable for point-to-multipoint communication over broadcast channels. In these schemes, multiple copies of each data block are sent contiguously instead of one single copy. A data block is considered successfully transmitted if it is positively acknowledged at least once by each receiver during all the transmission attempts. The mean delay time analysis is carried out assuming infinite receiver buffer size. In the case of geometrically distributed interarrival times, the analyzed results show excellent agreement with the simulated results. Based on numerical results, a considerable performance improvement can be achieved by sending each data block the optimum number of copies instead of just one single copy. The effect of finite receiver buffer size was taken into account by simulation. It was found that even with a small receiver buffer, the system performance degraded only slightly.<>
{"title":"Some selective repeat ARQ schemes for point-to-multipoint communication","authors":"Tsern-Huei Lee, Jo-Ku Hu","doi":"10.1109/ICC.1992.268042","DOIUrl":"https://doi.org/10.1109/ICC.1992.268042","url":null,"abstract":"The authors consider some electric selective repeat automatic repeat request (ARQ) schemes suitable for point-to-multipoint communication over broadcast channels. In these schemes, multiple copies of each data block are sent contiguously instead of one single copy. A data block is considered successfully transmitted if it is positively acknowledged at least once by each receiver during all the transmission attempts. The mean delay time analysis is carried out assuming infinite receiver buffer size. In the case of geometrically distributed interarrival times, the analyzed results show excellent agreement with the simulated results. Based on numerical results, a considerable performance improvement can be achieved by sending each data block the optimum number of copies instead of just one single copy. The effect of finite receiver buffer size was taken into account by simulation. It was found that even with a small receiver buffer, the system performance degraded only slightly.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132952292","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}
Basic exchange radio (BEXR) is a point-to-multipoint wireless subscriber loop carrier system for basic exchange teeommunications radio services (BETRS) in rural areas. Frequencies for BETRS in the United Stttare in the 150-MHz, 450-MHz, and 800-MHz bands. The authors present a preliminary statistical analysis of measured fading data for a BEXR link. Due to significant differences in the antenna beam widths and path clearance, the statistical behaviors of fading signals on the BEXR links differ from those on the microwave links. The authors compare predictions by the existing microwave radio models with the measured BEXR data, and propose modifications to the microwave models to extend their applicability to BEXR links.<>
{"title":"Empirical modifications to microwave radio signal fading models for basic exchange radio","authors":"Jean‐Fu Kiang, S.H. Lin","doi":"10.1109/ICC.1992.267994","DOIUrl":"https://doi.org/10.1109/ICC.1992.267994","url":null,"abstract":"Basic exchange radio (BEXR) is a point-to-multipoint wireless subscriber loop carrier system for basic exchange teeommunications radio services (BETRS) in rural areas. Frequencies for BETRS in the United Stttare in the 150-MHz, 450-MHz, and 800-MHz bands. The authors present a preliminary statistical analysis of measured fading data for a BEXR link. Due to significant differences in the antenna beam widths and path clearance, the statistical behaviors of fading signals on the BEXR links differ from those on the microwave links. The authors compare predictions by the existing microwave radio models with the measured BEXR data, and propose modifications to the microwave models to extend their applicability to BEXR links.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"601 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133432946","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}
The authors study the performance of the unslotted ALOHA multiple access protocol in a high speed bidirectional bus network. For point-to-point communications, its maximum throughput is known to be independent of the ratio of end-to-end propagation delay to packet transmission time. For broadcast communications, it is shown that, if the offered load density is uniform along the bus, the maximum throughput achievable by a station depends on its location along the bus. To achieve a uniform throughput density, the offered load density has to vary along the bus. The optimal profile for the offered load density is derived. In any case, the maximum throughput degrades with the ratio of end-to-end propagation delay to packet transmission time.<>
{"title":"Unslotted ALOHA in high speed bidirectional bus networks","authors":"W.C. Lee, P. Humblet","doi":"10.1109/ICC.1992.268069","DOIUrl":"https://doi.org/10.1109/ICC.1992.268069","url":null,"abstract":"The authors study the performance of the unslotted ALOHA multiple access protocol in a high speed bidirectional bus network. For point-to-point communications, its maximum throughput is known to be independent of the ratio of end-to-end propagation delay to packet transmission time. For broadcast communications, it is shown that, if the offered load density is uniform along the bus, the maximum throughput achievable by a station depends on its location along the bus. To achieve a uniform throughput density, the offered load density has to vary along the bus. The optimal profile for the offered load density is derived. In any case, the maximum throughput degrades with the ratio of end-to-end propagation delay to packet transmission time.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132281722","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}
Sequential sequence estimation for communications channels with convolutionally coded input sequence and suffering from intersymbol interference (ISI) is proposed. The receiver structure, which consists of a whitened matched filter and a vector sequential decoder, and a metric, which is critical for the vector sequential algorithm, are derived.<>
{"title":"Sequential sequence estimation for ISI channels with convolutionally coded input sequence","authors":"F. Xiong","doi":"10.1109/ICC.1992.267985","DOIUrl":"https://doi.org/10.1109/ICC.1992.267985","url":null,"abstract":"Sequential sequence estimation for communications channels with convolutionally coded input sequence and suffering from intersymbol interference (ISI) is proposed. The receiver structure, which consists of a whitened matched filter and a vector sequential decoder, and a metric, which is critical for the vector sequential algorithm, are derived.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132441881","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}
B. Wedding, D. Schlump, B. Franz, B. Junginger, R. Heidemann, E. Zielinski, S. Dahl-Petersen, K. Schuesler, J. Hauenschild, H. Rein
The distribution of 64 digital HDTV channels coded at 140 Mb/s to 262144 subscribers via standard single-mode fiber was experimentally demonstrated using cascaded laser-diode-pumped/Er-doped optical amplifiers and a high-speed multiquantum-well laser. A multigigabit time division multiplexing (TDM) approach with direct detection technology was used. The feasibility of digital TV distribution to several thousand subscribers by using optical amplifiers and a passive optical network was shown. No optical filters were used and optical isolators were used very sparsely to reduce the cost per subscriber.<>
{"title":"10 Gbit/s to 260000 subscribers using optical amplifier distribution network","authors":"B. Wedding, D. Schlump, B. Franz, B. Junginger, R. Heidemann, E. Zielinski, S. Dahl-Petersen, K. Schuesler, J. Hauenschild, H. Rein","doi":"10.1109/ICC.1992.268129","DOIUrl":"https://doi.org/10.1109/ICC.1992.268129","url":null,"abstract":"The distribution of 64 digital HDTV channels coded at 140 Mb/s to 262144 subscribers via standard single-mode fiber was experimentally demonstrated using cascaded laser-diode-pumped/Er-doped optical amplifiers and a high-speed multiquantum-well laser. A multigigabit time division multiplexing (TDM) approach with direct detection technology was used. The feasibility of digital TV distribution to several thousand subscribers by using optical amplifiers and a passive optical network was shown. No optical filters were used and optical isolators were used very sparsely to reduce the cost per subscriber.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"15 12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127660614","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}
The implementation and performance of multicast packet switching in a broadband network environment are discussed. In terms of scheduling the transmission of the copies of the packet onto output ports, two basic service disciplines have been defined: (1) one-shot scheduling where all the copies are transmitted in the same time slot; and (2) call splitting with transmission over several time slots. As subcategories of call splitting strict-sense call splitting specifies that each packet can send at most one copy to the destination per time slot and wide-sense call splitting does not carry this restriction. A novel scheme called revision scheduling is proposed to mitigate the head of line blocking effect by sequentially combining the one-shot scheduling and the call splitting disciplines. Schematic structures are introduced for each category of scheduling, in the form of combinational logic circuits which are designed to resolve the output contentions corresponding to call scheduling disciplines, by incorporating a cyclic priority access policy. To compare the performances of various techniques, simulation studies were performed.<>
{"title":"Call scheduling in multicasting packet switching","authors":"X. Chen, J. Hayes","doi":"10.1109/ICC.1992.268157","DOIUrl":"https://doi.org/10.1109/ICC.1992.268157","url":null,"abstract":"The implementation and performance of multicast packet switching in a broadband network environment are discussed. In terms of scheduling the transmission of the copies of the packet onto output ports, two basic service disciplines have been defined: (1) one-shot scheduling where all the copies are transmitted in the same time slot; and (2) call splitting with transmission over several time slots. As subcategories of call splitting strict-sense call splitting specifies that each packet can send at most one copy to the destination per time slot and wide-sense call splitting does not carry this restriction. A novel scheme called revision scheduling is proposed to mitigate the head of line blocking effect by sequentially combining the one-shot scheduling and the call splitting disciplines. Schematic structures are introduced for each category of scheduling, in the form of combinational logic circuits which are designed to resolve the output contentions corresponding to call scheduling disciplines, by incorporating a cyclic priority access policy. To compare the performances of various techniques, simulation studies were performed.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127860395","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}
Several optical fiber system architectures for use in residential and business local loops are compared in terms of their economic and technical benefits. The architectures include fiber-to-the-curb (FTTC) double star configuration, fiber-to-the-building (FTTB) tree configuration, FTTB fiber-to-the-office (FTTO) star configuration, and FTTB/FTTO ring/star configuration. It is concluded that a copper access network is more cost effective for narrowband services, although fiber-based solutions allow an easier evaluation toward broadband services.<>
{"title":"Fibre loop architectures: a comparative evaluation","authors":"A. Farina, R. Rosi, A. Trondoli","doi":"10.1109/ICC.1992.267971","DOIUrl":"https://doi.org/10.1109/ICC.1992.267971","url":null,"abstract":"Several optical fiber system architectures for use in residential and business local loops are compared in terms of their economic and technical benefits. The architectures include fiber-to-the-curb (FTTC) double star configuration, fiber-to-the-building (FTTB) tree configuration, FTTB fiber-to-the-office (FTTO) star configuration, and FTTB/FTTO ring/star configuration. It is concluded that a copper access network is more cost effective for narrowband services, although fiber-based solutions allow an easier evaluation toward broadband services.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131914909","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}
The authors consider the provision of a cordless telephony service over a passive optical network (PON) using fiber-radio techniques. Results from a practical demonstration of a cordless telephony service, using CT2 (second generation cordless telephone) technology, over an eight-way split PON are also presented and used to predict the performance over higher split optical networks.<>
{"title":"CTPON-cordless telephony services over a passive optical network using fibre radio techniques","authors":"A. Cooper, D.M. Smith, R. Merrett","doi":"10.1109/ICC.1992.268283","DOIUrl":"https://doi.org/10.1109/ICC.1992.268283","url":null,"abstract":"The authors consider the provision of a cordless telephony service over a passive optical network (PON) using fiber-radio techniques. Results from a practical demonstration of a cordless telephony service, using CT2 (second generation cordless telephone) technology, over an eight-way split PON are also presented and used to predict the performance over higher split optical networks.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124120828","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}
The authors propose a new estimator which unifies linear matched filters and matched median filters. The optimality of linear matched filters and matched median under Gaussian noise and Laplacian noise, respectively, makes the new estimator suited to various noise environments. An adaptive algorithm is derived for parameter estimation of the optimal estimator under the mean square error criterion. As an application of the new adaptive estimator (AE), detection of antipodal signals was simulated. The results demonstrate that the AE had almost the same performance as the linear matched filter and the matched median filter under Gaussian and Laplacian noise, respectively, while under contaminated Gaussian noise, it performed better than the two filters.<>
{"title":"Adaptive estimator of signal amplitude in unknown noise environment","authors":"Q. Liu, J. Astola, Y. Neuvo","doi":"10.1109/ICC.1992.268172","DOIUrl":"https://doi.org/10.1109/ICC.1992.268172","url":null,"abstract":"The authors propose a new estimator which unifies linear matched filters and matched median filters. The optimality of linear matched filters and matched median under Gaussian noise and Laplacian noise, respectively, makes the new estimator suited to various noise environments. An adaptive algorithm is derived for parameter estimation of the optimal estimator under the mean square error criterion. As an application of the new adaptive estimator (AE), detection of antipodal signals was simulated. The results demonstrate that the AE had almost the same performance as the linear matched filter and the matched median filter under Gaussian and Laplacian noise, respectively, while under contaminated Gaussian noise, it performed better than the two filters.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114921079","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}
The author discusses some key points of telecommunications development, with particular reference to the data in some countries during this century, focusing on those aspects that might be considered of importance. Emphasis is given to the new conditions and favorable circumstances, particularly after the fall of communism in Eastern Europe. Key issues to accelerate social and economic development, as a prerequisite and main factor for telecommunications development, are considered. Some attention is paid to the basis of the present degree of development, to the possible evolution of the customer demand and the new technologies, to the growing need of information transfer and processing capacity, and to the new aspects of quality of service.<>
{"title":"Quality trends and perspectives at beginning of the next millennium","authors":"F. Riciniello","doi":"10.1109/ICC.1992.268013","DOIUrl":"https://doi.org/10.1109/ICC.1992.268013","url":null,"abstract":"The author discusses some key points of telecommunications development, with particular reference to the data in some countries during this century, focusing on those aspects that might be considered of importance. Emphasis is given to the new conditions and favorable circumstances, particularly after the fall of communism in Eastern Europe. Key issues to accelerate social and economic development, as a prerequisite and main factor for telecommunications development, are considered. Some attention is paid to the basis of the present degree of development, to the possible evolution of the customer demand and the new technologies, to the growing need of information transfer and processing capacity, and to the new aspects of quality of service.<<ETX>>","PeriodicalId":170618,"journal":{"name":"[Conference Record] SUPERCOMM/ICC '92 Discovering a New World of Communications","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114958426","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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