Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications最新文献_第6页

Behavioral characteristics of DQDB subnetworks in a hierarchical communication system 分层通信系统中DQDB子网的行为特征

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368954

H. S. Khera, M. Ilyas, V. Bemmel

引用次数: 1

Turbo-codes and high spectral efficiency modulation 涡轮码和高频谱效率调制

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368804

S. L. Goff, A. Glavieux, C. Berrou

引用次数: 504

How to assign service areas in a cellular mobile telephone system 如何在蜂窝式移动电话系统中分配服务区域

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368996

I. A. Cimet

引用次数: 13

OFDM with guard interval and sub-channel equalization in a 2-resolution transmission scheme for digital television broadcasting 二分辨率数字电视广播传输方案中具有保护间隔和子信道均衡的OFDM

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368988

G. Santella

{"title":"OFDM with guard interval and sub-channel equalization in a 2-resolution transmission scheme for digital television broadcasting","authors":"G. Santella","doi":"10.1109/ICC.1994.368988","DOIUrl":"https://doi.org/10.1109/ICC.1994.368988","url":null,"abstract":"The interest in a new digital terrestrial TV system, that allows improved quality and receiver portability, leads to the choice of a modulation system suitable for operation in a very hostile environment (interferences, multipath). A very effective solution, already experimented with digital audio broadcasting, is the orthogonal frequency division multiplexing (OFDM) technique with a guard interval. Unluckily such an interval grows from a few ten microseconds, sufficient for typical urban propagation environment, up to 600 microseconds, when the emerging single frequency network (SFN) is considered. A long guard interval (as required in a SFN) results in a excessive prolongation of the symbol period (T) and thus in bandwidth efficiency loss. In addition, the use of a too long symbol period is limited by the effects of time selectivity of the channel and by technological limitations. In this light, the use is suggested of a shorter guard interval and a low complexity equaliser at the output of each subcarrier to reduce the error produced by the echoes exceeding the guard interval duration. A multiresolution (MR) transmission scheme has been adopted in order to eliminate the sharp threshold effect in the fringes of the broadcast area. The system performances of a 2-resolution OFDM system have been evaluated by computer simulation on a frequency-selective channel for Rice and Rayleigh propagation environment.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"6 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":"121288239","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: 24

Performance of trellis codes for primary rate ISDN 主速率ISDN网格码性能研究

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368808

A. Khalifa, S. Ahamed

引用次数: 0

Element management requirements for evolving access networks 演进接入网的元素管理需求

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368721

A. Kerrison, A. Gillespie, R. Mistry, P. Brannan, C. Clough

{"title":"Element management requirements for evolving access networks","authors":"A. Kerrison, A. Gillespie, R. Mistry, P. Brannan, C. Clough","doi":"10.1109/ICC.1994.368721","DOIUrl":"https://doi.org/10.1109/ICC.1994.368721","url":null,"abstract":"Access networks (ANs) cover that part of a network which exists between customers and exchanges. Increasingly not only are ANs becoming more sophisticated but they are also tending to combine features of both exchanges and transmission systems. In order to cope with this evolution a new type of TMN Q3 interface [CCITT Recommendation M.3010, 1992] is required to convey management information to and from the associated operations systems (OSs). To avoid different interfaces to the many and varied ANs being deployed, the new interface needs to be technology and implementation independent. This is best achieved by a common management interface between the network operators' OSs and the suppliers equipment. This type of interface would be terminated by an element manager (EM) that translates between the generic interface to an OS and the application specific communication within the AN. The need to accommodate different architecture's within a common interface cannot be met by the existing generic (object model) CCITT framework, and an approach being developed by the ETSI NA4 Sub-Technical Committee seems more appropriate. The common interface must also be capable of handling the ongoing build and evolution of the AN. This can be modelled by making use of a logical parallel with test management. In the longer term, ANs will evolve and become responsible for services. This has management implications which are revolutionary and still to be fully worked out.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"70 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":"126067942","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

Comparison of upgrade techniques for mobile communication systems 移动通信系统升级技术比较

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368995

M. Tangemann, R. Rheinschmitt

{"title":"Comparison of upgrade techniques for mobile communication systems","authors":"M. Tangemann, R. Rheinschmitt","doi":"10.1109/ICC.1994.368995","DOIUrl":"https://doi.org/10.1109/ICC.1994.368995","url":null,"abstract":"For current mobile communication systems, two limitations exist which restrict their capacity and range of application. They can be characterised as an equipment limit which is determined by the maximum number of mobile stations that can be supported by a base station with given equipment, and an interference limit, which corresponds to a maximum number of carriers that can be used in a cell if a given signal-to-interference ratio must be guaranteed. Depending on base station (BS) equipment dimensioning and propagation conditions in the cell coverage area, one of the two limits will apply and define a maximum capacity of the base station that cannot be exceeded without modifications of the base station. Several techniques for base station upgrades have been developed which focus on one of the two limits or both. In the paper, traditional techniques such as spectrum upgrade, sectorisation, codec rate reduction and cell splitting are revised and compared to a new technique called A-SDMA (adaptive space division multiple access), which is introduced. Based on the comparison, evolution plans for different areas of application are developed which take these upgrade techniques into account and provide upgrade paths for mobile communication system infrastructures, applicable to current systems such as GSM as well as future systems (UMTS, FPLMTS).<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"40 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":"126871564","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: 31

Traffic: forecasting of signaling networks 交通:信令网络的预测

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368932

M. Tu

引用次数: 2

Expandable ATOM switch architecture (XATOM) for ATM LANs 用于ATM局域网的可扩展ATOM交换机架构(XATOM)

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368983

R. Fan, H. Suzuki, K. Yamada, N. Matuura

{"title":"Expandable ATOM switch architecture (XATOM) for ATM LANs","authors":"R. Fan, H. Suzuki, K. Yamada, N. Matuura","doi":"10.1109/ICC.1994.368983","DOIUrl":"https://doi.org/10.1109/ICC.1994.368983","url":null,"abstract":"There is growing interest in building ATM switch based \"multimedia LANs\" as the next generation local area networks, which overcomes performance limitations of shared media type LANs, such as Ethernet and FDDI. Since LAN terminals tend to transmit packets at the same speed as that of network links, such as at 100 Mbps, ATM LAN switches are inevitable to provide much larger buffer capacity than public network ATM switches, which are designed to accommodate lower-speed data services than the network link speed. Moreover, both low delay switching and multicast functions are required for multimedia applications. Responding to these requirements, this paper proposes a new switch architecture, referred to as \"expandable ATOM switch (XATOM)\", which is a kind of input and output buffer switch architecture, and can expand the buffer capacity simply by adding low cost memory chips. By combining low-speed and large capacity input-buffer memories and a backpressure control between input and output buffers, the XATOM switch can achieve high-throughput with low cell loss rate even in high-speed burst traffic environments. Since contention among multiple input buffers is eliminated in the XATOM switch, the input buffer management, both for avoiding head-of-line blocking and for supporting priority and multicast control functions, can be easily implemented. Delay and cell loss probability for the XATOM switch have been evaluated based on simulation study results. The paper also discusses some implementation specific details.<<ETX>>","PeriodicalId":112111,"journal":{"name":"Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications","volume":"1105 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":"116053289","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: 28

CAM-based single-chip shared buffer ATM switch 基于cam的单片机共享缓冲ATM交换机

Proceedings of ICC/SUPERCOMM'94 - 1994 International Conference on Communications Pub Date : 1994-05-01 DOI: 10.1109/ICC.1994.368914

K. J. Schultz, P. Gulak

引用次数: 38