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Performance comparison of combined ECC/RLL codes ECC/RLL组合码的性能比较
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117355
C. A. French, Y. Lin
{"title":"Performance comparison of combined ECC/RLL codes","authors":"C. A. French, Y. Lin","doi":"10.1109/ICC.1990.117355","DOIUrl":"https://doi.org/10.1109/ICC.1990.117355","url":null,"abstract":"The authors present a comparison of several combined error-correcting/run-length-limited codes created by concatenating a convolutional code with a run-length-limited code. Encoding and decoding are accomplished using a single trellis based on the combined code. Half of the codes under investigation use conventional (d,k) run-length-limited codes, where d is the minimum and k is the maximum allowable run of 0s between 1s. The other half use a special class of distance-preserving codes which have the property that the pairwise Hamming distances out of the (d,k) encoder are at least as large as the corresponding distances into the encoder. Thus a combined code, created using a convolutional code concatenated with a distance-preserving (d,k) code, will have a free distance no smaller than that of the original convolutional code. A computer simulation compares the performance of these two types of codes over the binary symmetric channel for various (d,k) constraints, rates, free distances, and numbers of states. Of particular interest for magnetic recording applications ar codes with run-length constraints","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122276532","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}
引用次数: 2
New applications of wideband technology 宽带技术的新应用
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117223
W. Giguere
{"title":"New applications of wideband technology","authors":"W. Giguere","doi":"10.1109/ICC.1990.117223","DOIUrl":"https://doi.org/10.1109/ICC.1990.117223","url":null,"abstract":"Wideband packet technology (WPT) provides bandwidth on demand at the primary rate for combined services such as image, voice, data, and low-speed video. The DS-1 carrier bandwidth provides the medium for efficient combined packetization of voice and data. The unique characteristics of voice, which cannot stand variable delay but can stand bit dropping, complement the characteristics of data, which cannot stand bit dropping, but can stand some variable delay. Extending the ISDN (integrated services digital network) LAPD protocol across the total bandwidth provides information and control over the network in a forward-acting manner which allows noncoordinated restoration and traffic-dependent time-of-day calling without switching. International transport between the North American 1.5 Mb/s and CCITT 2.04 Mb/s primary rates takes advantage of voice compression and FAX G.3 demodulation, which provides 6:1 FAX G.3 compression. A network management system provides graphic descriptions of the traffic, maintenance, and administration of a large, interconnected, self-healing network through the same packet stream used for information transport.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131986752","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}
引用次数: 6
Redefining what is meant by quality of customer premises equipment 重新定义客户驻地设备质量的含义
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117028
A. J. Bailetti, H. M. Bender
{"title":"Redefining what is meant by quality of customer premises equipment","authors":"A. J. Bailetti, H. M. Bender","doi":"10.1109/ICC.1990.117028","DOIUrl":"https://doi.org/10.1109/ICC.1990.117028","url":null,"abstract":"Traditionally, quality of customer premises equipment (CPE) has meant conformance and reliability, while quality of after sales services has meant lowest downtime period. It is argued here that, although these definitions may be adequate when CPE buyers use their communications facilities as internal technical utilities, they are unsuitable when they use them as business resources to create value for customers. The trends likely to prevail well into the twenty-first century are expected to exert pressure to define CPE quality in terms of conformance to buyers' business strategies and outmode the concept of quality as conformance to technical specifications developed by quality assurance groups. Five main implications of this change for quality managers are identified.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"292 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130030732","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}
引用次数: 0
Multilevel coherent optical system based on Stokes parameters modulation 基于Stokes参数调制的多电平相干光学系统
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117343
G. De Marchis, S. Betti, F. Curti, E. Iannone
{"title":"Multilevel coherent optical system based on Stokes parameters modulation","authors":"G. De Marchis, S. Betti, F. Curti, E. Iannone","doi":"10.1109/ICC.1990.117343","DOIUrl":"https://doi.org/10.1109/ICC.1990.117343","url":null,"abstract":"The authors present a polarization-modulated system called N-Stokes parameter-shift keying, which is suitable for local and metropolitan area network applications. The proposed multilevel system is based on demodulation of polarization-modulated signals by Stokes parameter detection, exploiting the property that each state of the transmitted signal can be represented by a point on a Poincare sphere. The transmitted states of polarization, can be represented by a point set on the Poincare sphere and must be chosen to minimize the error probability. The metric characteristics of the spherical surface allow the system performance for a given number of levels to be improved with respect to conventional multilevel systems, in which the representative points of the transmitted field states are bound to a line or part of a plane surface. A heuristic explanation is that on a spherical surface, when the number of points increases, the distance between them decreases more slowly with respect to multilevel systems working on plane metrics. Two fundamental problems of coherent optical systems are solved: polarization modulation ensures wide insensitivity to laser phase noise, while an electronic feedforward algorithm allows the state of polarization fluctuations due to single-model fiber birefringence to be compensated.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130056844","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}
引用次数: 75
Structural way of thinking as applied to productivity 结构思维方式应用于生产力
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117029
Z. Koono, H. Tsuji, M. Soga
{"title":"Structural way of thinking as applied to productivity","authors":"Z. Koono, H. Tsuji, M. Soga","doi":"10.1109/ICC.1990.117029","DOIUrl":"https://doi.org/10.1109/ICC.1990.117029","url":null,"abstract":"Structures residing in methods for improving software productivity are reported. A development process may be hierarchically broken down into elementary processes, showing a constancy of man-hours for the work. Improvement of productivity is reduced to improving the processes. Progress is reached by a learning or feedback process of analyzing and devising better procedures based on previous experiences.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134297425","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}
引用次数: 8
Next-generation digital access systems 下一代数字访问系统
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117137
L. Davis, P. Willcock, D. Paone
{"title":"Next-generation digital access systems","authors":"L. Davis, P. Willcock, D. Paone","doi":"10.1109/ICC.1990.117137","DOIUrl":"https://doi.org/10.1109/ICC.1990.117137","url":null,"abstract":"The trends in electronic access systems and related technologies are reviewed. Such new features as SONET (synchronous optical network) feeder, multiservice line cards, remote testing, and bandwidth management are described. The features described will allow telephone companies to provide present and future services needed by the business community with lower costs, better performance, and faster response than ever before. The use of high-bandwidth optical feeder links extends the performance and capacity benefits of digital fiber systems to the business premises.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132685609","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}
引用次数: 0
Lightnet: a class of efficient high speed access protocols Lightnet:一类高效的高速访问协议
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117347
P. Jacquet, P. Muhlethaler
{"title":"Lightnet: a class of efficient high speed access protocols","authors":"P. Jacquet, P. Muhlethaler","doi":"10.1109/ICC.1990.117347","DOIUrl":"https://doi.org/10.1109/ICC.1990.117347","url":null,"abstract":"New and simple high-speed access protocols for unidirectional media work on the same topologies as Expressnet, but instead of providing an asynchronous round-robin service, they give a synchronous service. The medium access is random but includes a reservation scheme to guarantee fairness and determinism, and to prevent starvation. These protocols allow high utilization of channel capacity regardless of propagation delay, the number of active stations, and the distribution of the traffic. Access delays remain very small. Simple analytical models are proposed for evaluating the protocols. Results derived from these models are compared with results from simulation. The match between the two is quite good. Also included is a comparison between Expressnet and Lightnet protocols.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132949607","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}
引用次数: 3
Robustness of data compression coding schemes for still pictures over noisy channels 噪声信道上静态图像数据压缩编码方案的鲁棒性
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117231
K. Takahashi, N. Ishii
{"title":"Robustness of data compression coding schemes for still pictures over noisy channels","authors":"K. Takahashi, N. Ishii","doi":"10.1109/ICC.1990.117231","DOIUrl":"https://doi.org/10.1109/ICC.1990.117231","url":null,"abstract":"A comparative study of the performances of five data-compression coding schemes over noisy channels is presented. The schemes are adaptive cosine transform coding, DPCM (differential pulse code modulation), adaptive block coding, vector quantization coding, and progressive transmission coding. Transmission is considered both with and without error control. For the former case, relations among bit error rate, signal-to-noise ratio (SNR), and mean code length are discussed. The influence of bit errors in the control information for adaptive coding is also studied. For the latter case, two error control procedures are examined: automatic repeat request and forward error correction. Some tradeoffs between increase of the code length and improvement of SNR by the error control procedures are discussed.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127871648","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}
引用次数: 2
Statistical characteristics of bit error occurrence on digital radio channels 数字无线电信道误码发生的统计特性
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117257
D. Jeske, A. Tsolakis
{"title":"Statistical characteristics of bit error occurrence on digital radio channels","authors":"D. Jeske, A. Tsolakis","doi":"10.1109/ICC.1990.117257","DOIUrl":"https://doi.org/10.1109/ICC.1990.117257","url":null,"abstract":"Some statistical characteristics of transmission errors associated with a digital radio channel in the absence of protection switching are examined. It is demonstrated that the occurrence or nonoccurrence of bit errors in an unprotected digital radio channel is a dependent stochastic process. Additionally, it is shown that the distribution of the number of errored seconds in a given time interval depends upon the cause of the errors. Multipath fading, for example, will cause equal numbers of severely errored seconds and nonseverely errored seconds. On the other hand, equipment failures and maintenance activity cause more severely errored seconds than nonseverely errored seconds. These signature characteristics are related to the lack of independence in the occurrence of bit errors in adjacent seconds. The results discussed have important implications in the development of performance models for digital radio. In particular, they demonstrate the need for a controlled experiment dedicated to the study of the correlation structure that governs the occurrence of bit errors.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134497888","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}
引用次数: 0
CRMA: an access scheme for high-speed LANs and MANs CRMA:一种高速局域网和城域网的接入方案
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117351
M. Nassehi
{"title":"CRMA: an access scheme for high-speed LANs and MANs","authors":"M. Nassehi","doi":"10.1109/ICC.1990.117351","DOIUrl":"https://doi.org/10.1109/ICC.1990.117351","url":null,"abstract":"Cyclic-reservation multiple access is presented for networks based on slotted unidirectional bus structure, both folded and dual-bus configurations. The cyclic-reservation access provides both throughput efficiency and flexibility in capacity allocation, which can be used to achieve any set of fairness conditions. The reservation-cancellation backpressure minimizes the worst-case access delay. CRMA provides the capability of reserving consecutive slots for transmitting a packet, thus facilitating reassembly, and is well suited to supercomputer-networking applications such as visualization, high-resolution graphics, and image-retrieval systems. The recovery from transmission errors is simple owing to the centralized-global-queue approach. These properties make CRMA suitable for both LANs and MANs in the gigabit-per-second, as well as the 100-Mb/s speed range.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131882843","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}
引用次数: 105
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