{"title":"The Impact of FEC on Mobile Multicast Power Control","authors":"A. Alexiou, C. Bouras, Andreas Papazois","doi":"10.1109/AICT.2010.13","DOIUrl":"https://doi.org/10.1109/AICT.2010.13","url":null,"abstract":"3GPP has standardized the use of forward error correction for the provision of reliable data transmission in the mobile multicast framework. In this paper we present a study of the impact of application layer forward error correction on power control during mobile multicast transmission. The evaluation is performed with the aid of a novel scheme that allows the simulation of FEC impact on both streaming delivery and download delivery over a multicast session. It is important that the proposed scheme incorporates the properties of an evolved mobile network, as they are determined by the 3GPP specifications.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"826 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122378281","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}
Diogo Acatauassu, Igor Mesquita, Francisco C. B. F. Müller, A. Klautau
{"title":"DSL Impulse Noise Measurement System Implemented in USRP and GNU Radio","authors":"Diogo Acatauassu, Igor Mesquita, Francisco C. B. F. Müller, A. Klautau","doi":"10.1109/AICT.2010.48","DOIUrl":"https://doi.org/10.1109/AICT.2010.48","url":null,"abstract":"This paper describes an impulse noise measurement system for digital subscriber line channels composed by open hardware/software elements developed using the universal software radio peripheral and GNU is not Unix Radio. The proposed system proved to be capable of digitizing real occurrences of impulse noise. The goal is to use such system in large scale measurement campaigns, and then derive stochastic models for behavioral description of impulse noise. These models will provide better methods to reduce impulse noise effects, ever improving the quality of service in digital subscriber line transmissions.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123758108","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}
I. B. Martins, F. R. Barbosa, E. Moschim, L. H. Bonani
{"title":"Proposal and Evaluation of Photonic Switching Architectures for High-Capacity Optical Access Networks","authors":"I. B. Martins, F. R. Barbosa, E. Moschim, L. H. Bonani","doi":"10.1109/AICT.2010.39","DOIUrl":"https://doi.org/10.1109/AICT.2010.39","url":null,"abstract":"Considering that optical packet/burst switching (OPS/OBS) are considered strong candidates for metropolitan networks in the near future, this work is a contribution evaluating the performance of some network models based on OPS/OBS mesh/ring architectures. We use both the conventional models of ring and mesh (Manhattan Street type), and slightly modified models implementing new structures, with cases of unidirectional and of bi-directional links. Our main goal here is to find through computer simulations the better architectures, in terms of (higher) capacity and (lower) latency. We choose the parameters average number of hops, total number of deflections and packet loss fraction as metrics for network performance. We observe that networks with best performance are the ones with largest number of different paths between nodes.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125364310","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}
{"title":"Image Processing Techniques as a Support to Transmitter Positioning Determination in Cognitive Radio Networks","authors":"L. Bolea, J. Pérez-Romero, R. Agustí, O. Sallent","doi":"10.1109/AICT.2010.45","DOIUrl":"https://doi.org/10.1109/AICT.2010.45","url":null,"abstract":"Cognitive radio is a new paradigm for wireless communications offering a solution to conciliate the current spectrum demand growth and underutilization without changes to the existing legacy wireless systems. Secondary users should be able to identify spatial and temporal spectrum holes not occupied by primary users and use them opportunistically, without generating interference to primary receivers. For that purpose, having knowledge of the primary network is required to ensure an appropriate secondary user operation. In this context, and assuming there is no cooperation between primary and secondary networks, this paper proposes a new framework, based on image processing techniques, aimed at combining a number of sensed samples at different geographical positions collected by secondary sensors, in order to estimate the positions of the different primary transmitters. The results can be used to discover frequencies that can be used by a secondary network without disturbing primary receivers. Our results, performed in a realistic scenario, show the efficacy of the proposed framework in estimating transmitter positions.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125503996","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}
A. Paun, C. Vladeanu, I. Marghescu, S. E. Assad, J. Carlach, R. Quéré
{"title":"New Recursive Convolutional GF(2N) Encoders for Parallel Turbo-TCM Schemes","authors":"A. Paun, C. Vladeanu, I. Marghescu, S. E. Assad, J. Carlach, R. Quéré","doi":"10.1109/AICT.2010.76","DOIUrl":"https://doi.org/10.1109/AICT.2010.76","url":null,"abstract":"In this paper, parallel turbo phase shift keying – trellis coded modulation (Turbo PSK-TCM) schemes are designed using recursive convolutional encoders over Galois field GF(2^N). These encoders are designed using the nonlinear left-circulate (LCIRC) function. The LCIRC function performs a bit left circulation over the representation word. An optimum 1-delay GF(2^N) recursive convolutional encoder scheme using LCIRC (RC-LCIRC) is proposed for PSK-TCM schemes. The minimum Euclidian distance is estimated for these PSK-TCM schemes and it is shown that these structures offer the maximum coding gains. However, the RC-LCIRC encoders are less complex than the corresponding binary encoders. The optimum RC-LCIRC encoder is used as component encoder of a parallel turbo PSK-TCM transmission scheme, using the iterative multilevel log-MAP algorithm in the receiver. The bit error rate (BER) is estimated by simulation for the proposed Turbo PSK-TCM transmissions over an additive white Gaussian noise (AWGN) channel, and the results are similar to the conventional Turbo-TCM schemes.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127910621","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}
A. Vallejo, A. Zaballos, Alejandro Campos, J. Dalmau
{"title":"Optimizing the Usage of COPS Protocol in ITU-T NGN Architecture","authors":"A. Vallejo, A. Zaballos, Alejandro Campos, J. Dalmau","doi":"10.1109/AICT.2010.100","DOIUrl":"https://doi.org/10.1109/AICT.2010.100","url":null,"abstract":"Work on the development of end-to-end QoS control management architecture for Next Generation Networks started at ITU-T a few years ago and it is still under way. This paper provides an overview of some of the protocols proposed by ITU-T (COPS-PR), describes others (COPS-SLS) developed to cover functionalities which have no corresponding protocols to date. This paper details the development of a mechanism designed to optimize the interaction between both of the aforementioned protocols and the Linux based testbed where it has been implemented. Furthermore, we propose a new protocol named COPS-E2E, aimed at improving end-to-end QoS control management efficiency.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128300319","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}
J. Rugelj, Sven Knockaert, Roel Van Steenberghe, Luk Schoofs, Janne Salonen, Kari Bjorn, J. Marzo, C. V. Carvalho
{"title":"Advanced Networking Technologies Study Programme: A Design Based on Competences","authors":"J. Rugelj, Sven Knockaert, Roel Van Steenberghe, Luk Schoofs, Janne Salonen, Kari Bjorn, J. Marzo, C. V. Carvalho","doi":"10.1109/AICT.2010.91","DOIUrl":"https://doi.org/10.1109/AICT.2010.91","url":null,"abstract":"In this article, authors present the objectives of the EU ERASMUS CD project: European Study Programme for Advanced Networking Technologies (ESPANT). Major novelties in the development of one year curriculum long and lifelong learning oriented are discussed. The competences design aspects are described and a Syllabus contents presented as a crucial methodology to develop the ESPANT innovative teaching approach. In ESPANT, training has place in a realistic, real world environment rather than an artificial lab setup where operational competences rather than the reproduction of theoretical details play a central role. Flexibility of the Teaching/Learning paradigm is guaranteed by implementing educational novelties such as e-learning, video conferencing and distance learning.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132753958","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}
T. Tsiatsos, E. Stavridou, A. Grammatikopoulou, S. Douka, G. Sofianidis
{"title":"Exploiting Annotated Video to Support Dance Education","authors":"T. Tsiatsos, E. Stavridou, A. Grammatikopoulou, S. Douka, G. Sofianidis","doi":"10.1109/AICT.2010.59","DOIUrl":"https://doi.org/10.1109/AICT.2010.59","url":null,"abstract":"This article deals with the employment of annotated video in order to support dance education. More specifically, it is investigated the usage of multimedia technology in learning and teaching of Greek traditional dances. One of the issues faced by the teachers is that they do not have the opportunity of practicing Greek traditional dances before they teach them in a class of students. Therefore, there is a specific need for the teachers of physical education to recall the Greek traditional dances that they should teach in Primary Education schools. Furthermore, the pupils want to attend many times the performance of a dance in order to learn how to dance Greek traditional dances. The only means to support the teachers are (a) books which describe the Greek traditional dances in, a rather abstruse, symbolic language and (b) face-to-face seminars, which are not suitable for wide scale training due to time and cost limitations. More specifically, the article investigates the added value offered by annotated video presentations to support the learning and teaching of Greek traditional dances. The evaluation by a large number of students showed that annotated video presentations of a dance are helpful for the experienced dancers and neutral for the novice dancers.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133768467","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}
{"title":"Conservative Cell Load Approximation for Radio Networks with Shannon Channels and its Application to LTE Network Planning","authors":"K. Majewski, M. Koonert","doi":"10.1109/AICT.2010.9","DOIUrl":"https://doi.org/10.1109/AICT.2010.9","url":null,"abstract":"The aim of this work is wireless network design and optimization. The well-known Shannon-Hartley formula describes the achievable bitrate of a noisy transmit channel. The downlink air-interface of UTRAN Long Term Evolution (LTE) seems to closely follow such a law, when it is modified with appropriate bandwidth and signal to noise ratio (SNR) efficiency factors. Motivated by this observation, we address the problem to characterize the cell loads in large radio networks when the achieved downlink air interface bitrates follow modified Shannon-Hartley laws. We take advantage of the concavity of an appropriate transform of these laws in order to establish a system of conservative cell load and call acceptance probability equations. This approximation achieves a dimension reduction from the number of mobiles to the number of cells. We suggest to solve the obtained fixed-point equations through a direct iteration and to deduce the network capacity from the solution. This procedure yields network capacity evaluations which are fast enough to support network planning processes. For this purpose we sketch a simple local search algorithm for the selection of base station locations and optimization of cell parameters. In an example we show that the proposed cell load calculation and network capacity optimization is fast enough to support this site selection and cell configuration planning method for LTE networks.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116336007","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}
{"title":"Hybrid Wireless Mesh Network for Universal Access: Opportunities and Challenges","authors":"S. Kumaran, Charles Semapondo","doi":"10.1109/AICT.2010.86","DOIUrl":"https://doi.org/10.1109/AICT.2010.86","url":null,"abstract":"Broadband wireless networks are rapidly expanding over the world. Although wireless technologies like Worldwide Interoperability for Microwave Access (WiMAX) and Wireless Fidelity (Wi-Fi) provide broadband connectivity, they have been optimized for different usage models: WiMAX for high-speed metropolitan area network (MAN) connectivity and Wi-Fi for high-speed local area network (LAN) connectivity. Both uses Internet Protocol (IP) based technologies to provide connection services to the Internet. By combining WiMAX and Wi-Fi access technologies in a mesh mode, service providers can offer better usability of the networks infrastructure to provide universal access in a cost effective manner. In this paper, we give an overview of a system model of Hybrid Wireless Mesh Network (HWMN) that can be formed by integrating WiMAX mesh and Wi-Fi mesh. HWMN can be used to provide Universal Access to sparsely populated areas. This paper proposes the different possible deployment scenarios and discusses about some applications of HWMN. It also outlines some of the research issues that are to be investigated in HWMN.","PeriodicalId":339151,"journal":{"name":"2010 Sixth Advanced International Conference on Telecommunications","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123819267","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}