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Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications最新文献

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Closed loop carrier phase synchronization techniques motivated by likelihood functions 基于似然函数的闭环载波相位同步技术
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368944
H. Tsou, M. Simon, Sami Hinedi
{"title":"Closed loop carrier phase synchronization techniques motivated by likelihood functions","authors":"H. Tsou, M. Simon, Sami Hinedi","doi":"10.1109/ICC.1994.368944","DOIUrl":"https://doi.org/10.1109/ICC.1994.368944","url":null,"abstract":"Motivated by the theory of MAP carrier phase estimation, the authors have developed a number of closed loop structures suitably derived from maximum-likelihood (ML) and average-likelihood (AL) functions. Several of these structures reduce to previously known closed loop carrier phase synchronizers while others appear to be new. Of particular interest is one of the ML structures which, when properly optimized, gives improved mean-square phase error performance over the other ML and AL structures. The improvement is largest at low symbol SNR and is thus quite significant in applications that involve a combination of low rate coding and antenna arraying such as the NASA/JPL Galileo mission to Jupiter. The structures proposed in the paper are not exhaustive of the ways that closed loop phase synchronizers can be derived from open loop MAP estimation theory. Rather they are given primarily to indicate the variety of different closed loop schemes that can be constructed simply from likelihood and log-likelihood functions.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122134465","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
Jitter implications on optical fibre PPM performance 抖动对光纤PPM性能的影响
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368800
J. Elmirghani, R. Cryan
{"title":"Jitter implications on optical fibre PPM performance","authors":"J. Elmirghani, R. Cryan","doi":"10.1109/ICC.1994.368800","DOIUrl":"https://doi.org/10.1109/ICC.1994.368800","url":null,"abstract":"An original spectral evaluation of optical fibre PPM in the presence of jitter is presented using the format cyclostationary properties. The results are used to provide a thorough performance analysis. The extracted slot clock timing variance is evaluated as a function of the PPM number of slots, PLL bandwidth and the normalised fibre bandwidth for both pattern-dependent and receiver noise generated jitter. The probability of wrong slot error (WSE) due to imperfect slot synchronisation is then evaluated and shown to be optimisable through proper selection of the mentioned parameters.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129578078","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
Implementation of telecommunication configurations 电信配置的实现
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.369047
I.G. Reyniers
{"title":"Implementation of telecommunication configurations","authors":"I.G. Reyniers","doi":"10.1109/ICC.1994.369047","DOIUrl":"https://doi.org/10.1109/ICC.1994.369047","url":null,"abstract":"B-ISDN offers the capabilities needed for multiparty, multimedia telecommunication services. This paper describes a possible basis for a resource control protocol. A protocol consists of a mechanism for information exchange and a format for the information itself. Our proposal uses atomic actions as the information exchange mechanism and defines a possible information structure. This representation, the telecommunication configuration, is the 'data' in the atomic action. Implementing telecommunication configurations is a difficult problem if the algorithm has to cover all cases. This paper shows how artificial intelligence concepts can be used to simplify the problem. The techniques used are illustrated by the output of a prolog program.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124649403","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
A distributed paths migration scheme for IEEE 802.6 based personal communication networks 基于IEEE 802.6的个人通信网络分布式路径迁移方案
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368952
N. Huang, Ko-Shung Chen
{"title":"A distributed paths migration scheme for IEEE 802.6 based personal communication networks","authors":"N. Huang, Ko-Shung Chen","doi":"10.1109/ICC.1994.368952","DOIUrl":"https://doi.org/10.1109/ICC.1994.368952","url":null,"abstract":"Wireless personal communications will be provided via the usage of microcells in urban areas. The current centralized architecture may be unsuitable with the increased processing load and handoff rate associated with microcells. Some distributed architectures based upon interconnected IEEE 802.6 MANs for wireless personal communications have been proposed recently. The IEEE 802.6 MAN is attractive since it also provides isochronous services which are quite suitable for voice communications. In such a network, a communication path between two mobile terminals may be inefficient due to the lack of better paths when the path is established or become inefficient due to the mobility of terminals, e.g., the path elongates and consumes too much isochronous channels. In this paper, a distributed paths migration scheme is proposed for the IEEE 802.6 based personal communication networks. This distributed scheme automatically recognizes inefficient paths and migrates them to better ones, if any. During the migration, the property of isochronous services is also preserved. The performance of this scheme is evaluated by simulations. Simulation results show that the proposed paths migration scheme dramatically reduces the number of isochronous channels consumed per path. As a result, the call blocking rate is reduced and the number of successful established paths is increased significantly.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130349369","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: 23
Congestion control strategies for mixed X.25/frame relay networks 混合X.25/帧中继网络的拥塞控制策略
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368758
A. J. Vernon, T. Jawor, S. Rabie, D. Whiting, H. Badran
{"title":"Congestion control strategies for mixed X.25/frame relay networks","authors":"A. J. Vernon, T. Jawor, S. Rabie, D. Whiting, H. Badran","doi":"10.1109/ICC.1994.368758","DOIUrl":"https://doi.org/10.1109/ICC.1994.368758","url":null,"abstract":"The paper addresses traffic management strategies in multi-service corporate communication networks. In particular, it proposes a unified congestion control scheme for mixed X.25/frame relay networks which meets users' requirements of effectiveness, fairness, and implementation efficiency. Key elements of the design include early detection of impending congestion by the various network resources, explicit notification of congestion information to the affected network services, and the use of adaptive rate and window control mechanisms by the various services to limit traffic admission into the network during overload. A comprehensive simulation test-bed was constructed for evaluating and tuning the proposed algorithms, and the results were verified against live networking equipment. Simulation results confirm the success of the congestion control strategy in maximizing network throughput, and minimizing users' packet loss rate and end-to-end delay under a wide range of congestion situations. The described algorithms have been successfully incorporated in the design of large multi-service data communication networks.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123940009","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: 1
Simulation of multipath fading channels using the Monte-Carlo method 用蒙特卡罗方法模拟多径衰落信道
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368773
A. Muller
{"title":"Simulation of multipath fading channels using the Monte-Carlo method","authors":"A. Muller","doi":"10.1109/ICC.1994.368773","DOIUrl":"https://doi.org/10.1109/ICC.1994.368773","url":null,"abstract":"The Monte-Carlo method is a novel and flexible approach to multipath channel simulation. The author shows that it includes the conventional tapped delay line simulation. In particular, the author considers its application to WSSUS channels. Numerical simulation results are presented.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124023179","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: 17
Mesh/arc networking: an architecture for efficient survivable self-healing networks 网状/圆弧网络:一种高效、可存活的自愈网络架构
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368859
G. N. Brown, W. Grover, J.B. Slevinsky, M. MacGregor
{"title":"Mesh/arc networking: an architecture for efficient survivable self-healing networks","authors":"G. N. Brown, W. Grover, J.B. Slevinsky, M. MacGregor","doi":"10.1109/ICC.1994.368859","DOIUrl":"https://doi.org/10.1109/ICC.1994.368859","url":null,"abstract":"This paper summarises the results of a study which compares two architectures for survivable self-healing transport networks. Mesh/ring and mesh/arc networks are compared in terms of equipment counts required to achieve fully survivability against single span failure. Heuristic design procedures are developed. The mesh/arc network architecture is shown to be superior in all cases studied. Two main contributions to survivable network design/planning have resulted from this study. The first is the use of the network nodal degree distribution to partition a network into core and access regions. The second is the use of span elimination techniques as a cost-reducing transformation for the access region of networks.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124237713","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: 16
ADSL noise environment and potential system performance ADSL噪声环境和潜在的系统性能
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368863
W. Chen, D. Waring
{"title":"ADSL noise environment and potential system performance","authors":"W. Chen, D. Waring","doi":"10.1109/ICC.1994.368863","DOIUrl":"https://doi.org/10.1109/ICC.1994.368863","url":null,"abstract":"In this paper the general ADSL (asymmetric digital subscriber line) noise environment is reviewed in the context of the telephone loop plant. Special attention is given to the unique unidirectional transmission nature of ADSL. A set of noise environments is presented for related computer simulation studies and hardware tests. A set of mid-CSA test loops is also proposed for performance evaluation under conditions of T1 NEXT interference. To simplify calibration procedures, noise and loop models are revealed in FIR (finite impulse response) filter form and can be measured in dB loss or dBm/Hz power density terms. A subchannel signal to noise ratio (SNR) based computer simulation method is then used to estimate potential ADSL performance under different noise environments for different serving areas.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121480839","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
A software fault insertion testing methodology for improving the robustness of telecommunications systems 一种提高电信系统稳健性的软件故障插入测试方法
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368731
Tsanchi Li, Chi-Ming Chen, B. Horgan, M. Lai, S.Y. Wang
{"title":"A software fault insertion testing methodology for improving the robustness of telecommunications systems","authors":"Tsanchi Li, Chi-Ming Chen, B. Horgan, M. Lai, S.Y. Wang","doi":"10.1109/ICC.1994.368731","DOIUrl":"https://doi.org/10.1109/ICC.1994.368731","url":null,"abstract":"Testing fault tolerance of a telecommunications system is difficult due to the size and complexity of the software. This paper proposes a software fault insertion testing (SFIT) methodology. Those logical system components responsible for fault handling and service provision are defined as the fault manager and service manager, respectively. SFIT is a technique that tests a system's fault tolerance by injecting software faults into the service manager and observing the behavior in the fault manager. Our experiences and lessons learned in SFIT for various telecommunications systems are also discussed in this paper.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121553064","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: 5
No slot wasting bandwidth balancing with immediate use of TAR bit 没有插槽浪费带宽平衡与立即使用TAR位
Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368956
D. Karvelas, M. Papamichail
{"title":"No slot wasting bandwidth balancing with immediate use of TAR bit","authors":"D. Karvelas, M. Papamichail","doi":"10.1109/ICC.1994.368956","DOIUrl":"https://doi.org/10.1109/ICC.1994.368956","url":null,"abstract":"The no slot wasting bandwidth balancing (NSW BWB) mechanism has been recently proposed for high speed DQDB networks. Its advantage is that it introduces fairness without wasting channel slots and can converge very fast to the steady state where fair bandwidth allocation is achieved. However, it may discriminate against lightly loaded stations in terms of delay. In this paper we propose a variation of the NSW BWB mechanism which enables lightly loaded stations to have a faster access to the transmission medium and thus lower delays. We provide a proof of the fairness of the new mechanism and investigate its delay performance. Furthermore, we compare it with NSW BWB as well as with the BWB mechanism which has been incorporated in the IEEE 802.6 standard.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125475026","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
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