Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937795
Xiaoxiao. Zhou, Jianbo Liu, Wen-tao Song, Han-wen Luo
This extended abstract presents a new class of codes, chaotic turbo codes, which can be used in chaotic secure communication for mobile systems. In our research, the conventional turbo codes and chaotic digital encoder are implemented together in an effective way. After a lot of simulation, we found that chaotic turbo codes bring some important properties to both turbo codes and chaotic secure communication. We have also made great efforts into developing and evaluating some practical chaotic iterative decoding algorithms for efficient exploitation.
{"title":"Chaotic turbo codes in secure communication","authors":"Xiaoxiao. Zhou, Jianbo Liu, Wen-tao Song, Han-wen Luo","doi":"10.1109/EURCON.2001.937795","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937795","url":null,"abstract":"This extended abstract presents a new class of codes, chaotic turbo codes, which can be used in chaotic secure communication for mobile systems. In our research, the conventional turbo codes and chaotic digital encoder are implemented together in an effective way. After a lot of simulation, we found that chaotic turbo codes bring some important properties to both turbo codes and chaotic secure communication. We have also made great efforts into developing and evaluating some practical chaotic iterative decoding algorithms for efficient exploitation.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115959441","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937776
D. Matolak
Much recent interest has been focused upon third-generation cellular systems, particularly wideband code division multiple access (WCDMA). Deployments must consider scarce available spectrum, so researchers have been investigating spectral overlay, as a means of increasing capacity. Spectral overlay may also be a method used during transition from current to future systems. Based upon a method developed in Matolak (2000), we estimate capacities of WCDMA when overlaid upon the Global System for Mobile communication (GSM). This method is an improvement upon the standard technique for approximating multiuser interference (MUI), and is more general than previous work in that it allows for different values of data rate within each system, an arbitrary number of overlaid CDMA systems, inclusion of outside-cell as well as outside-system interferences, and narrowband interferers. We apply the method to GSM and WCDMA, and explore via several examples the capacities achievable as a function of several system parameters, including the number of GSM frequency allocations, relative power levels, and a number of different data rates.
{"title":"Capacity estimation for spectrally-overlaid WCDMA & GSM systems","authors":"D. Matolak","doi":"10.1109/EURCON.2001.937776","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937776","url":null,"abstract":"Much recent interest has been focused upon third-generation cellular systems, particularly wideband code division multiple access (WCDMA). Deployments must consider scarce available spectrum, so researchers have been investigating spectral overlay, as a means of increasing capacity. Spectral overlay may also be a method used during transition from current to future systems. Based upon a method developed in Matolak (2000), we estimate capacities of WCDMA when overlaid upon the Global System for Mobile communication (GSM). This method is an improvement upon the standard technique for approximating multiuser interference (MUI), and is more general than previous work in that it allows for different values of data rate within each system, an arbitrary number of overlaid CDMA systems, inclusion of outside-cell as well as outside-system interferences, and narrowband interferers. We apply the method to GSM and WCDMA, and explore via several examples the capacities achievable as a function of several system parameters, including the number of GSM frequency allocations, relative power levels, and a number of different data rates.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115474780","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937788
E. Udvary
An experimental and theoretical study is presented for the transmission and noise characteristics of semiconductor optical amplifiers (SOAs). This device is very relevant in the novel optical networks. So the gain and noise performance are important in all the linear and nonlinear regimes. The paper exhibits the main SOA characteristics which were also measured.
{"title":"Noise performance of semiconductor optical amplifiers","authors":"E. Udvary","doi":"10.1109/EURCON.2001.937788","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937788","url":null,"abstract":"An experimental and theoretical study is presented for the transmission and noise characteristics of semiconductor optical amplifiers (SOAs). This device is very relevant in the novel optical networks. So the gain and noise performance are important in all the linear and nonlinear regimes. The paper exhibits the main SOA characteristics which were also measured.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114856313","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937760
Y. Zlotnikov, M. Kopeetsky
The new perspective techniques for cell recovery in ATM end-to-end connections and in ATM virtual paths are introduced and analyzed. These techniques are based on the forward error correction (FEC) strategy and are oriented to delivery of non-realtime data over a set of ATM switching nodes. Specifically, using a special class of two-dimensional error correcting codes of variable length in the virtual paths allows a significant simplification of the complexity of the network protocol stack. Besides, no data retransmission operations are considered on the ATM adaptation layer (AAL) or by means of the service specific connection oriented protocol. The parameters of the analyzed techniques can be adjusted automatically depending on cell flow intensity and on error distribution in the fiber optic communication channel. A special mechanism is proposed to inform a decoding device about the dimensions of each sequential data unit delivered in a virtual path and to protect the dimensions' identifier from random errors.
{"title":"Advanced cell recovery techniques for ATM networks","authors":"Y. Zlotnikov, M. Kopeetsky","doi":"10.1109/EURCON.2001.937760","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937760","url":null,"abstract":"The new perspective techniques for cell recovery in ATM end-to-end connections and in ATM virtual paths are introduced and analyzed. These techniques are based on the forward error correction (FEC) strategy and are oriented to delivery of non-realtime data over a set of ATM switching nodes. Specifically, using a special class of two-dimensional error correcting codes of variable length in the virtual paths allows a significant simplification of the complexity of the network protocol stack. Besides, no data retransmission operations are considered on the ATM adaptation layer (AAL) or by means of the service specific connection oriented protocol. The parameters of the analyzed techniques can be adjusted automatically depending on cell flow intensity and on error distribution in the fiber optic communication channel. A special mechanism is proposed to inform a decoding device about the dimensions of each sequential data unit delivered in a virtual path and to protect the dimensions' identifier from random errors.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129700332","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937782
Stanislav Milanovic, Z. Petrovic
A storage area network deployment within a global communications company is presented. The new storage-centric infrastructure includes an open, modular and scalable storage network, not tied to any one server or application. A leading provider of telecommunication solutions was looking to move ahead quickly with SAN technology to achieve early and sustainable competitive advantage by leveraging its information resources.
{"title":"Building the enterprise-wide storage area network","authors":"Stanislav Milanovic, Z. Petrovic","doi":"10.1109/EURCON.2001.937782","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937782","url":null,"abstract":"A storage area network deployment within a global communications company is presented. The new storage-centric infrastructure includes an open, modular and scalable storage network, not tied to any one server or application. A leading provider of telecommunication solutions was looking to move ahead quickly with SAN technology to achieve early and sustainable competitive advantage by leveraging its information resources.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128437233","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.938170
P. Homan, J. Bester
The possibility of enabling quality of service in input-queued packet switches has been investigated. An expanded version of the maximum weight matching (MWM) scheduling mechanism has been proposed by including additional weight calculation algorithms. The overall results are quite satisfactory. Clearly, the performance of output-queued packet switches cannot be achieved, but controlled service class separation is possible. For example, by using the weighted fair queuing (WFQ) weight calculation algorithm, fair bandwidth distribution can be achieved.
{"title":"Enabling quality of service in input-queued packet switches","authors":"P. Homan, J. Bester","doi":"10.1109/EURCON.2001.938170","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938170","url":null,"abstract":"The possibility of enabling quality of service in input-queued packet switches has been investigated. An expanded version of the maximum weight matching (MWM) scheduling mechanism has been proposed by including additional weight calculation algorithms. The overall results are quite satisfactory. Clearly, the performance of output-queued packet switches cannot be achieved, but controlled service class separation is possible. For example, by using the weighted fair queuing (WFQ) weight calculation algorithm, fair bandwidth distribution can be achieved.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129747539","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.938108
J. Stergar, B. Horvat
In our paper, we present different approaches to designing multimedia presentations with multimedia authoring tools. We present different possibilities in implementing media (such as text, graphics, animation, sound and video) in one such authoring tool and compare its capabilities for managing and manipulating media compared with other multimedia authoring tools. The heart of the matter is an interactive tutorial (multimedia presentation) designed with a flow chart based authoring tool. The main goal of this tutorial is in tutoring the basics of MM design with Authorware and concerns built-in functions (additional presentations are also built with such a multimedia authoring approach) supported in the flow chart based approach to multimedia authoring. We designed the tutoring tool with the concept of distance learning and user testing over the Internet. In our discussion, we emphasize distance learning and conclude with an approach controlling user interactivity within the flow chart based multimedia presentations.
{"title":"Distance learning approach in multimedia tutoring","authors":"J. Stergar, B. Horvat","doi":"10.1109/EURCON.2001.938108","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938108","url":null,"abstract":"In our paper, we present different approaches to designing multimedia presentations with multimedia authoring tools. We present different possibilities in implementing media (such as text, graphics, animation, sound and video) in one such authoring tool and compare its capabilities for managing and manipulating media compared with other multimedia authoring tools. The heart of the matter is an interactive tutorial (multimedia presentation) designed with a flow chart based authoring tool. The main goal of this tutorial is in tutoring the basics of MM design with Authorware and concerns built-in functions (additional presentations are also built with such a multimedia authoring approach) supported in the flow chart based approach to multimedia authoring. We designed the tutoring tool with the concept of distance learning and user testing over the Internet. In our discussion, we emphasize distance learning and conclude with an approach controlling user interactivity within the flow chart based multimedia presentations.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125068026","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937754
M. Koonert, H. Zepernick, S. Nordholm
Adaptive equalisation techniques are required in digital mobile radio systems to combat intersymbol interference, which is caused by the time-variant multipath propagation of signals. In this paper, we focus on the trans-European trunked radio (TETRA) system and examine decision feedback equaliser structures that may be used as an optional function in Class E equipment of the standard.
{"title":"Performance of an equaliser for trans-European trunked radio","authors":"M. Koonert, H. Zepernick, S. Nordholm","doi":"10.1109/EURCON.2001.937754","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937754","url":null,"abstract":"Adaptive equalisation techniques are required in digital mobile radio systems to combat intersymbol interference, which is caused by the time-variant multipath propagation of signals. In this paper, we focus on the trans-European trunked radio (TETRA) system and examine decision feedback equaliser structures that may be used as an optional function in Class E equipment of the standard.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"278 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123085683","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.938119
I. Benc, M. Štefanec, S. Srbljic
To improve the performance of the multiprocessor, distributed and Internet-based systems, data replication is being introduced. Existence of multiple copies of the same object in the system causes the cache coherence problem. There are two basic mechanisms for maintaining cache coherence: write-invalidate and write-update mechanisms. Various protocols for multiprocessor and distributed systems have been developed that use both coherence mechanisms in order to maintain cache coherence with minimal overhead costs. These protocols are based on a decision function that dynamically switches between write-update and write-invalidate mechanisms. As a part of the hSATTL cache coherence protocol we designed a new decision function adapted for Internet-based systems that dynamically switches between basic coherence mechanisms. In order to prove the efficiency of the designed decision function we compared the performance of the hSATTL protocol with the performance of the ATTL and SATTL protocols, which do not implement decision functions. As the performance measure, we use the server load and the amount of data that is transferred between the server and the proxy in order to maintain cache coherence.
{"title":"Decision function in hybrid self-adaptive WWW cache coherence protocol (hSATTL)","authors":"I. Benc, M. Štefanec, S. Srbljic","doi":"10.1109/EURCON.2001.938119","DOIUrl":"https://doi.org/10.1109/EURCON.2001.938119","url":null,"abstract":"To improve the performance of the multiprocessor, distributed and Internet-based systems, data replication is being introduced. Existence of multiple copies of the same object in the system causes the cache coherence problem. There are two basic mechanisms for maintaining cache coherence: write-invalidate and write-update mechanisms. Various protocols for multiprocessor and distributed systems have been developed that use both coherence mechanisms in order to maintain cache coherence with minimal overhead costs. These protocols are based on a decision function that dynamically switches between write-update and write-invalidate mechanisms. As a part of the hSATTL cache coherence protocol we designed a new decision function adapted for Internet-based systems that dynamically switches between basic coherence mechanisms. In order to prove the efficiency of the designed decision function we compared the performance of the hSATTL protocol with the performance of the ATTL and SATTL protocols, which do not implement decision functions. As the performance measure, we use the server load and the amount of data that is transferred between the server and the proxy in order to maintain cache coherence.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122873115","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}
Pub Date : 2001-07-04DOI: 10.1109/EURCON.2001.937786
D. Bruckmann
In a digital receiver with broadband signal sampling, digital decimation filters are required. The signal is sampled and digitised in such an architecture by a properly designed quantiser and the decimation stages after the quantiser should be programmable to provide flexibility. In this contribution, a new architecture for the implementation of high-order, programmable decimation filters is described. Using this filter concept, the flexibility with respect to multimode capability and the degree of integration can be drastically increased. It will be shown that the use of cascaded low-order wave digital lattice filters for the lower decimation filter stages results in a number of advantages compared to standard methods. By properly selecting the number of lattice filter cells and optimising the filter coefficients, a very efficient realisation is possible in VLSI-technology. Due to the simple filter structures and since no general multiplier is needed, significant hardware reduction can be obtained compared to existing solutions.
{"title":"Optimised decimation stages with lattice wave digital filters for a flexible digital receiver architecture","authors":"D. Bruckmann","doi":"10.1109/EURCON.2001.937786","DOIUrl":"https://doi.org/10.1109/EURCON.2001.937786","url":null,"abstract":"In a digital receiver with broadband signal sampling, digital decimation filters are required. The signal is sampled and digitised in such an architecture by a properly designed quantiser and the decimation stages after the quantiser should be programmable to provide flexibility. In this contribution, a new architecture for the implementation of high-order, programmable decimation filters is described. Using this filter concept, the flexibility with respect to multimode capability and the degree of integration can be drastically increased. It will be shown that the use of cascaded low-order wave digital lattice filters for the lower decimation filter stages results in a number of advantages compared to standard methods. By properly selecting the number of lattice filter cells and optimising the filter coefficients, a very efficient realisation is possible in VLSI-technology. Due to the simple filter structures and since no general multiplier is needed, significant hardware reduction can be obtained compared to existing solutions.","PeriodicalId":205662,"journal":{"name":"EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114759606","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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