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2009 Fifth Advanced International Conference on Telecommunications最新文献

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Adaptive MCS Selection in OFDM Systems Based on Channel Frequency Coherence 基于信道频率相干的OFDM系统自适应MCS选择
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.37
Muayad S. Al-Janabi, C. Tsimenidis, B. Sharif, S. L. Goff
{"title":"Adaptive MCS Selection in OFDM Systems Based on Channel Frequency Coherence","authors":"Muayad S. Al-Janabi, C. Tsimenidis, B. Sharif, S. L. Goff","doi":"10.1109/AICT.2009.37","DOIUrl":"https://doi.org/10.1109/AICT.2009.37","url":null,"abstract":"This paper presents a joint adaptive modulation and coding (AMC) scheme, which exploits the coherence bandwidth of the wireless channel to divide the transmitted frame into independent sub-channels that correspond to the channel coherence bandwidth. This strategy is implemented for orthogonal frequency division multiplexing (OFDM) systems with channel state information (CSI) feedback. Low density parity check (LDPC) codes are utilized for encoding by employing signal-to noise ratio (SNR) dependent coding rates, as well as distinct modulation schemes to achieve adaptivity to time-varying channel conditions. The performance of the proposed system was tested on Rayleigh fading channels that exhibit frequency coherent bands. Numerical results obtained via simulation demonstrate that the throughput of the proposed system and bit error rate (BER) performance are better than previously suggested approaches.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122279734","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: 10
Effect of Buffering Capability in Data Vortex Networks Based on 4-ary Routing Scheme 基于四元路由方案的数据漩涡网络缓冲能力的影响
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.76
Qimin Yang
{"title":"Effect of Buffering Capability in Data Vortex Networks Based on 4-ary Routing Scheme","authors":"Qimin Yang","doi":"10.1109/AICT.2009.76","DOIUrl":"https://doi.org/10.1109/AICT.2009.76","url":null,"abstract":"Buffering capability is added within each routing node of the modified Data Vortex network with the 4-ary routing scheme. In two different cases, either with single packet or with two packets routing within the node, the effect of buffering capability is studied in such networks. The results have confirmed that with additional hardware cost in buffering, the performance can be enhanced as that in the original binary routing Data Vortex networks. While buffering based on single packet routing allows for modest performance improvement, buffering based on two packets routing allows for much better latency and throughput performance compared with buffer-less networks, and such improvement is also more significant than the performance enhancement in binary decoding Data Vortex networks with the same buffering capabilities.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116664464","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
Self Similarity Analysis and Modeling of VoIP Traffic under Wireless Heterogeneous Network Environment 无线异构网络环境下VoIP业务的自相似分析与建模
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.19
B. Canberk, S. Oktug
{"title":"Self Similarity Analysis and Modeling of VoIP Traffic under Wireless Heterogeneous Network Environment","authors":"B. Canberk, S. Oktug","doi":"10.1109/AICT.2009.19","DOIUrl":"https://doi.org/10.1109/AICT.2009.19","url":null,"abstract":"Self similar behavior of the aggregate traffic is a well known issue in the networking area. In this paper, we first study the self similarity of the empirically aggregated VoIP traffic in a heterogeneous wireless network testbed environment and then model it using Fractional Gaussian Noise (fGn). The heterogeneity of the environment is provided by exploiting different wireless technologies in backbone and access networks. The backbone of the testbed is IEEE 802.16d WiMAX whereas the access network is IEEE 802.11b WiFi mesh architecture. We evaluate the self similarity in terms of throughput and packet inter-arrival time using empirically captured VoIP calls generated by softphones in the laboratory. We prove the collected data’s self similar characteristics with stochastic analysis using autocorrelation functions. We implement three well-known time domain estimators to obtain Hurst values for both metrics. We also suggest the Fractional Gaussian Noise (fGn) Model for the empirically aggregated VoIP data. The self similarity analysis and modeling performed in this work will motivate new design issues on the quality of service frameworks and resources allocation mechanisms such as buffers in wireless heterogeneous networks.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129139962","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: 10
Analysis of the Influence of Group Members Arrangement on the Multicast Tree Cost 组成员排列对组播树开销的影响分析
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.77
M. Piechowiak, M. Stasiak, P. Zwierzykowski
{"title":"Analysis of the Influence of Group Members Arrangement on the Multicast Tree Cost","authors":"M. Piechowiak, M. Stasiak, P. Zwierzykowski","doi":"10.1109/AICT.2009.77","DOIUrl":"https://doi.org/10.1109/AICT.2009.77","url":null,"abstract":"In the paper we introduce a group members arrangement as a new parameter for analyzing multicast routing algorithms finding multicast trees. We also propose a new multicast routing algorithm without constraints. The objective of STA (Switched Trees Algorithm) is to minimize the total cost of the multicast tree using a modification of the classical Prim's algorithm (Pruned Prim's Heuristic) and the SPT (Shortest Path Tree) algorithm that constructs a shortest path tree between a source and each multicast node.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133781911","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
Real-Time Traffic Analyzer for Measurement-Based Admission Control 基于测量的实时流量分析器
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.18
M. Kulikovs, E. Petersons
{"title":"Real-Time Traffic Analyzer for Measurement-Based Admission Control","authors":"M. Kulikovs, E. Petersons","doi":"10.1109/AICT.2009.18","DOIUrl":"https://doi.org/10.1109/AICT.2009.18","url":null,"abstract":"The Measurement-based Admission Control is used to achieve the required Quality of Service. The Measurement-based Admission Control mechanism provides significant functionality for integrated service guaranties. This paper presents the model of the traffic analyzer for real-time applications. It consists of two cross-dependent sub-modules: traffic measurement and traffic estimator. The model presented in the paper is characterized by low system overheads for real-time traffic parameters estimation.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133765349","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
Quantifying Improvements from Refinements in a VoIP Teleconference System 从VoIP电话会议系统的改进中量化改进
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.15
Teck-Kuen Chua, D. Pheanis
{"title":"Quantifying Improvements from Refinements in a VoIP Teleconference System","authors":"Teck-Kuen Chua, D. Pheanis","doi":"10.1109/AICT.2009.15","DOIUrl":"https://doi.org/10.1109/AICT.2009.15","url":null,"abstract":"In a VoIP (Voice over Internet Protocol) telephone system, we face the significant challenge of providing a teleconference feature that can support a large-scale teleconference without using excessive network bandwidth. This paper examines a new, bandwidth-efficient way of implementing a real-time VoIP teleconference system, and we present measurements of the improvements that we gained by refining our original concept. Our newly refined teleconference technique provides all of the features that previous teleconference systems provide, but our new approach consumes considerably less data bandwidth than previous systems require. The new system allows a network with a given capacity to accommodate nearly double the number of conference participants that an existing system would allow.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122187132","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
Adaptive Speech Quality Management in Voice-over-IP Communications ip话音通信中的自适应语音质量管理
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.17
Eugene S. Myakotnykh, Richard A. Thompson
{"title":"Adaptive Speech Quality Management in Voice-over-IP Communications","authors":"Eugene S. Myakotnykh, Richard A. Thompson","doi":"10.1109/AICT.2009.17","DOIUrl":"https://doi.org/10.1109/AICT.2009.17","url":null,"abstract":"The quality of VoIP communication relies significantly on the network that transports voice packets because this network does not usually guarantee available bandwidth, delay, and loss that are critical for real-time voice traffic. The solution proposed here is to manage a voice-over-IP stream dynamically, changing encoding parameters as needed to assure quality. The paper proposes an adaptive-rate control algorithm that establishes interaction between a VoIP sender and a receiver, and manages voice quality in real-time. Simulations demonstrate that the system provides better average communications quality than traditional fixed-rate VoIP.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129618382","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
Software Architecture for Better Text-Based Infromation Accessibility 更好的基于文本的信息可访问性的软件架构
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.41
V. Topac, V. Stoicu-Tivadar
{"title":"Software Architecture for Better Text-Based Infromation Accessibility","authors":"V. Topac, V. Stoicu-Tivadar","doi":"10.1109/AICT.2009.41","DOIUrl":"https://doi.org/10.1109/AICT.2009.41","url":null,"abstract":"The paper suggests a software architecture to improve the accessibility to information from texts. This software combines techniques like: Image Processing, Optical Character Recognition, Machine Translation, Text Analyze and Text to Speech. The application uses a scanner or a web cam as an image input device, recognizes the text by using OCR, enables text translation by using Google’s machine translation implementation, interpret the text as a future development and reads the text by using TTS technology. In this way the user can put the text information source into a scanner or under a web cam and can hear the text translated and interpreted, if required. A functional prototype is presented and conclusions are issued.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127280970","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
Design and Evaluation of a Dynamic Traffic Control System for Continuous Media 连续介质动态交通控制系统的设计与评价
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.62
M. Yabe, Naoto Yoshizawa, Tomoya Wakaume
{"title":"Design and Evaluation of a Dynamic Traffic Control System for Continuous Media","authors":"M. Yabe, Naoto Yoshizawa, Tomoya Wakaume","doi":"10.1109/AICT.2009.62","DOIUrl":"https://doi.org/10.1109/AICT.2009.62","url":null,"abstract":"As a system for guaranteeing Quality of Service of continuous media by traffic control, there exists Integrated Services using Resource ReSerVation Protocol that guarantees bandwidth for object traffics by executing bandwidth control. This system, however, restricts bandwidth for other traffics through the session of object traffics because of its static bandwidth control. Then, to solve the problem, we studied and designed a dynamic traffic control system that can not only guarantee Quality of Service of continuous media perfectly but also generate excess bandwidth for other traffics by executing bandwidth control dynamically. Furthermore, we evaluated the performance of the system by experiment for confirming the effectiveness of it. In this paper, we describe the design of the system and the evaluation results.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129452296","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
Overlay Management of Network Services for Multimedia Flows Transport over Multiple Domains - Testbed Validation 多媒体流跨多域传输网络服务的覆盖管理——试验台验证
2009 Fifth Advanced International Conference on Telecommunications Pub Date : 2009-05-24 DOI: 10.1109/AICT.2009.29
E. Borcoci, R. Lupu, S. Obreja
{"title":"Overlay Management of Network Services for Multimedia Flows Transport over Multiple Domains - Testbed Validation","authors":"E. Borcoci, R. Lupu, S. Obreja","doi":"10.1109/AICT.2009.29","DOIUrl":"https://doi.org/10.1109/AICT.2009.29","url":null,"abstract":"Multimedia flows transport over multiple IP domains requires quality of services (QoS)   guarantees.  In multi-domain contexts, the end-to-end QoS assurance needs cooperation of several resource management entities. Cooperation of the domains but also preservation of each domain’s autonomy are both required. This paper presents results on functional validation of a multiple domain overlay-developed management system, for QoS enabled network services. The testbed described is an instance of complex system architecture, targeting the transport and delivery of multimedia streams over multi-domain IP networks and heterogeneous access networks.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"360 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122775871","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
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