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Proceedings. Sixth IEEE Symposium on Computers and Communications最新文献

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Blind equalization of a class of IIR channel 一类IIR信道的盲均衡
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935432
D. Naughton, A. Fagan
{"title":"Blind equalization of a class of IIR channel","authors":"D. Naughton, A. Fagan","doi":"10.1109/ISCC.2001.935432","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935432","url":null,"abstract":"We examine some properties associated with twice oversampled IIR channels, and suggest a novel blind equalization scheme. We note that a twice oversampled IIR channel is equivalent to a single-channel feedback section in cascade with a two-channel feedforward section. We propose a two-step blind identification procedure for this class of channel, the performance of which we demonstrate by simulation. We note that such a procedure has particular application to channels with short feedback and long feedforward sections. We examine the nature of a Tomlinson-Harashima precoder, and show how a similar two-step blind identification can be applied when the precoder has a dynamics limited input.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133076784","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
Congestion control for differentiated-services using non-linear control theory 基于非线性控制理论的差异化服务拥塞控制
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935456
A. Pitsillides, L. Rossides, Petros A. Ioannou
{"title":"Congestion control for differentiated-services using non-linear control theory","authors":"A. Pitsillides, L. Rossides, Petros A. Ioannou","doi":"10.1109/ISCC.2001.935456","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935456","url":null,"abstract":"The growing demand of computer usage requires efficient ways of managing network traffic in order to avoid or at least limit the level of congestion in cases where increases in bandwidth are not desirable or possible. Using non-linear control theory we developed and analysed a generic integrated dynamic congestion control (IDCC) scheme for controlling traffic using information on the status of each queue in the network. The IDCC scheme is based on a nonlinear model of the network that is generated using fluid flow considerations. The methodology used is general and independent of technology, as for example TCP/IP or ATM. We assume a differentiated-services network framework and formulate our control strategy in the same spirit as IP Diff-Serv for three types of services: premium service, ordinary service, and best effort service. The three differentiated classes of traffic operate at each output port of a router/switch. An IDCC scheme is designed for each output port, and a powerful, simple to implement controller is designed and analysed. The IDCC methodology has been applied to an ATM network. We use OPNET simulations to demonstrate that the proposed control methodology achieves the desired behaviour of the network, and possesses important attributes, such as: stable and robust behaviour, high utilisation with bounded delay and loss performance, and good steady state and transient behaviour.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124870479","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: 38
ATM signalling overview and performance measurements in a local area ATM network 局域ATM网络中的ATM信令概述和性能测量
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935442
M. Maurogiorgis, N. Papadoukakis, E. Sykas, G. Tselikis
{"title":"ATM signalling overview and performance measurements in a local area ATM network","authors":"M. Maurogiorgis, N. Papadoukakis, E. Sykas, G. Tselikis","doi":"10.1109/ISCC.2001.935442","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935442","url":null,"abstract":"The time-overhead introduced with the performance of ATM end-to-end signalling operations is an important performance factor that determines the service quality. A significant time-overhead associated with the high rate establishment and release of many short-lived data channels, required in various multimedia applications, would result in network performance degradation. This paper presents traffic experiments conducted in a local area ATM network for the timing evaluation of end-to-end signalling operations. Timing results that quantify the introduced delays under diverse conditions of signalling load and traversed nodes are provided. Unexpected results and factors that may intensely affect the signalling performance are presented.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125101723","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: 4
A scheme for QoS-based dynamic multicast routing 一种基于qos的动态组播路由方案
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935365
A. Roumani, H. Hassanein
{"title":"A scheme for QoS-based dynamic multicast routing","authors":"A. Roumani, H. Hassanein","doi":"10.1109/ISCC.2001.935365","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935365","url":null,"abstract":"Multimedia applications involving real-time audio and/or video transmissions require strict QoS constraints (end-to-end delay bound, bandwidth availability and loss probability) to be met by the network. To guarantee real-time delivery of multimedia packets, a multicast channel needs to be established in advance using a path selection algorithm that takes into account the QoS constraints. In this paper we describe a distributed destination-controlled multicast routing (DCMR) protocol for multicasting with dynamic membership. DCMR establishes multicast connections in two stages, a forward routing stage, where setup messages carrying routing information are forwarded to the new destination, and a backward configuration stage, where the destination chooses a path with the highest available bandwidth under the delay constraint. Reservation is then attempted along this path backwards towards the multicast tree. Our simulations show that DCMR outperforms existing multicast routing algorithms in terms of call acceptance and connection setup time as it achieves low call blocking ratios.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116623374","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
Transmit and receive spatial multiplexing for broadband wireless communications 用于宽带无线通信的发射和接收空间多路复用
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935379
N. Boubaker, K. Letaief, R. Murch
{"title":"Transmit and receive spatial multiplexing for broadband wireless communications","authors":"N. Boubaker, K. Letaief, R. Murch","doi":"10.1109/ISCC.2001.935379","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935379","url":null,"abstract":"The next generation wireless communication systems are expected to support a wide range of high-quality services which require high data rate transmission as well as high system capacities. One of the most promising techniques for realizing extraordinary spectral efficiencies over wireless links is V-BLAST (Vertical-Bell Laboratories Layered Space-Time). This is a new system proposed by Bell Laboratories as an extremely efficient scheme for high capacity communications in wireless environments. The V-BLAST technique employs a multi-element antenna array technology at both the transmitter and receiver to increase system capacity, data rate as well as spectral efficiency. In this paper, and in contrast to previous work, we consider the performance of V-BLAST in a frequency selective fading channel. In particular, we investigate the effect of time delay spread on V-BLAST.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123224045","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: 4
End-to-end delay bound calculation in generalized processor sharing networks 广义处理器共享网络的端到端延迟界计算
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935388
P. Barta, F. Németh, R. Szabó, J. Bíró
{"title":"End-to-end delay bound calculation in generalized processor sharing networks","authors":"P. Barta, F. Németh, R. Szabó, J. Bíró","doi":"10.1109/ISCC.2001.935388","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935388","url":null,"abstract":"We propose a solution to the problem of calculating deterministic end-to-end delay bounds in arbitrary topology networks, which employ the generalized processor sharing (GPS) discipline at each node. We give a general framework under network calculus by extending the service curve model of GPS and constructing the end-to-end service curve for each session, from which exact values of delay and backlog bounds can be computed. Network internal traffic characterization and traffic shaping are applied to support local performance bound computation. Sessions are allowed to be arbitrary weighted and virtual feedback is handled by the iterative approach of Barta, Nemeth, Szabo and Bird (see ICC2001). Numerical examples are shown to illustrate our algorithmic approach for per-session end-to-end delay bound computation.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123625439","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: 9
Connection admission control (CAC) and resources allocation (RA) on the up/down link (UDL) in a low Earth orbit (LEO) satellite constellation 低地球轨道(LEO)卫星星座中上行/下行链路(UDL)上的连接准入控制(CAC)和资源分配(RA)
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935407
R. Fadel, S. Tohmé
{"title":"Connection admission control (CAC) and resources allocation (RA) on the up/down link (UDL) in a low Earth orbit (LEO) satellite constellation","authors":"R. Fadel, S. Tohmé","doi":"10.1109/ISCC.2001.935407","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935407","url":null,"abstract":"We study a multi-service connection admission control (CAC) policy and we derive the corresponding resources allocation (RA) mechanism to access the up/down link (UDL) in a low Earth orbit (LEO) satellite constellation used as an access network to a mobile terrestrial network. We propose the usage of a trunk reservation policy for bandwidth reservation that allows the network to route the call on the satellite where the blocking probability is a minimum. In our study, we assume that the network handles three types of call: real time voice calls, non-real time data calls with guaranteed bandwidth and non-real time elastic data calls. A Markovian modelling approach is used to analyse the bandwidth occupation and derive the analytical model for the RA scheme.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130458441","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: 4
A payment scheme for broadcast multimedia streams 一种广播多媒体流的支付方案
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935447
L. Buttyán, N. Salem
{"title":"A payment scheme for broadcast multimedia streams","authors":"L. Buttyán, N. Salem","doi":"10.1109/ISCC.2001.935447","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935447","url":null,"abstract":"Streaming multimedia data on the Internet is developing as a mainstream technology, which attracts many users by providing a new and convenient form of access to online multimedia information. While its strong business potential is obvious, many problems related to charging, copyright protection, and privacy can delay or even hinder its extensive deployment. In this paper we are concerned with the charging problem, and propose an electronic payment scheme to use for purchasing broadcast multimedia streams. Our design respects the pay-per-use principle, makes cheating uninteresting for both the user and the service provider, resists forgery and over-spending, protects sensitive payment information and user privacy, and allows the identification of misbehaving users.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130534533","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: 11
Multimedia QoS adaptation for inter-tech roaming 跨技术漫游的多媒体QoS适配
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935429
Cristian Hesselman, H. Eertink, A. Peddemors
{"title":"Multimedia QoS adaptation for inter-tech roaming","authors":"Cristian Hesselman, H. Eertink, A. Peddemors","doi":"10.1109/ISCC.2001.935429","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935429","url":null,"abstract":"We introduce a scalable application-level QoS adaptation service for roaming between wireless networks that are based on different technologies ('inter-tech' roaming). The service is part of a platform that supports the distribution of multimedia streams (e.g., a streamed TV channel) to mobile clients operating in a heterogeneous environment. Central to our approach is the notion of a service class, which is a domain-specific perceptual QoS level. Each domain in a wireless infrastructure must support a limited number of these service classes. Our adaptation service handles inter-tech roaming by handing a client off from one service class to another. We focus on the design of the adaptation service's client-side components. They combine the loss characteristics of the client's network interfaces with configurable policies to decide when to initiate a handoff to a target service class and when to complete it. We conclude with some experimental results.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129180079","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: 14
Experiences retrieving information in the world wide web 在万维网上检索信息的经验
Proceedings. Sixth IEEE Symposium on Computers and Communications Pub Date : 2001-07-03 DOI: 10.1109/ISCC.2001.935357
Fidel Cacheda, Á. Viña
{"title":"Experiences retrieving information in the world wide web","authors":"Fidel Cacheda, Á. Viña","doi":"10.1109/ISCC.2001.935357","DOIUrl":"https://doi.org/10.1109/ISCC.2001.935357","url":null,"abstract":"In this paper using the information obtained from the daily working of a Web directory, we attempt to expand the knowledge about the behavior of the users in order to improve and adapt the Internet search engines to their users. We have analysed more than 320,000 requests of the transaction log of a Spanish Web directory, focusing our attention, firstly, in the searches in order to confirm the main differences between Internet and traditional Information Retrieval systems. Furthermore, we have developed an exhaustive statistical analysis of searches, categories visited and documents viewed to achieve a mathematical pattern of behaviour for each one, and what it is more important, to establish a relationship between the variations in the behaviour of each one.","PeriodicalId":147986,"journal":{"name":"Proceedings. Sixth IEEE Symposium on Computers and Communications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127213302","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: 44
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