2010 17th International Conference on Telecommunications最新文献

{"title":"Wireless network token-based fast authentication","authors":"G. Kbar","doi":"10.1109/ICTEL.2010.5478863","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478863","url":null,"abstract":"Wireless Networks based on WIFI or WIMAX become popular and are used in many places as compliment network to wired LAN to support mobility. There is performance issues associated with the usage of WLAN that put some restriction on adapting this technology everywhere. Securing the open access to avoid attacks at the physical and MAC layer with high speed performance during authentication is considered an important issue. IEEE 802.1x, suggested a solution to address the security issue at the MAC layer, and there are varieties of implementations address this solution but they require long period of time to complete the authentication. In this paper a new technique for securing the WLAN network using fast token-based authentication has been invented to address the vulnerability inherited by the wireless network at the MAC layer. This technique is based on an authentication server distributing a security token, public authentication key, and network access key parameter to eligible mobile client MCs during registration. All messages will be encrypted during registration using temporary derived token key, but it will use derived valid token key during authentication. The token, the authentication key and the access network parameter key will be only distributed during registration. This makes the security parameters known only to authentication server, authenticator and MC. Attackers would be unlikely able to know the token and other security keys because they are only exchanged during registration. Moreover, this technique will avoid the exchange of public keys during authentication such as the one used in other existing technologies, and consequently speedup the authentication phase which is very critical to wireless technologies.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115530288","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":"MIMO wireless backhaul enabled by IPT forwarding","authors":"E. M. Mohamed, D. Kinoshita, K. Mitsunaga, Y. Higa, H. Furukawa","doi":"10.1109/ICTEL.2010.5478810","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478810","url":null,"abstract":"Wireless backhaul has been received much attention as an enabler of future broadband mobile communication systems because it can reduce deployment cost of pico-cells, an essential part of high capacity system. A high performance network in terms of high throughput, low average delay and low packet loss rate, is highly appreciated to sustain the increasing proliferation in multimedia transmissions. The critical issue reducing the performance of wireless backhaul is the interference occurred in the network due to simultaneous nodes transmissions. In this research, we propose a high performance wireless backhaul using the low interference sensitivity MIMO based nodes. MIMO transmission has a better BER performance over SISO one even with the same transmission rate and bandwidth, which means that MIMO can operate at lower SINR values than SISO and give the same performance. This MIMO robust performance against interference gives us a greater benefit when adopted as a wireless interface in wireless backhaul than SISO. These facts motivated us to use the IEEE 802.11n the current MIMO standard to design a MIMO based wireless backhaul. In addition and to justify our assumptions, we investigate the effect of MIMO channels correlation, a major drawback in MIMO transmission, upon the system performance, and prove the robustness of the scheme under different MIMO channels correlation values. After proving the effectiveness of MIMO as a wireless interface for wireless backhaul, we further improve the performance of this MIMO-backhaul using the high efficient Intermittent Periodic Transmit (IPT) protocol. IPT is a reduced interference packet forwarding protocol with a more efficient relay performance than conventional relay in which packets are transmitted continuously form the source nodes. By using these two techniques (IEEE 802.11n (MIMO) + IPT), wireless backhaul nodes can meet more demanding communication requirements such as higher throughput, lower average delay, and lower packet dropping rate than those achieved by simply applying IEEE 802.11n to conventionally relayed backhaul. The proposed wireless backhaul (MIMO+IPT) will accelerate introduction of picocell based mobile communication systems.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"3 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116821943","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":"The effectiveness of transmitting voice traffic over IPv6 convergence sublayer of WiMAX mesh networks","authors":"H. El-Hennawy, Haitham H. Gomaa, A. Amin","doi":"10.1109/ICTEL.2010.5478771","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478771","url":null,"abstract":"Internet Protocol version 6 (IPv6) is a new protocol that has been defined to ultimately replace IPv4. IPv6 solves the problem imposed by the limited 32-bit address field in IPv4. However the definition of the new protocol results in longer header size, which affects services that used to be transmitted over IP especially real-time services such as voice. As IP network is no longer confined to the wired domain and is being extended over wireless networks. The IEEE 802.16-based WiMAX (World Wide Interoperability of Microwave Access) promises to be one of the wireless access technologies capable of supporting very high bandwidth applications. In this paper, using the simulation results obtained by NS2, we demonstrate the effectiveness of transmitting voice traffic over IPv6 convergence sublayer of WiMAX mesh network and compare it with the quality in case of applying current header compression techniques, Robust Header Compression (ROHC) and Payload Header Suppression (PHS), and a new proposed modification to the PHS technique. We prove that using our proposed technique we improve the current PHS technique and approach the same performance of ROHC technique.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117100978","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":"Packet delay modeling of truncated multi-process ARQ protocols for parallel communications","authors":"G. Aniba, S. Aïssa","doi":"10.1109/ICTEL.2010.5478780","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478780","url":null,"abstract":"This paper presents a packet transmission delay modeling for networks using multiple truncated stop-and-wait (SAW) retransmission processes. The packet transmission delay includes the packet queueing delay (PQD) and the packet reordering delay (PRD). While the first type of delay is commonly known for any SAW procedure, the latter is only introduced when multiple SAW processes are considered for parallel communications. These processes work independently while sharing the same packet traffic. By modeling the queueing buffer as an M/G/∞ model, an analytical formula for the average PQD is provided. In addition, we model the PRD as a first-order Markov chain defined by a transition probability matrix, and derive the average PRD. Analytical formulae are provided considering the general case where error probabilities are different from a transmission to another, such as in automatic repeat request (ARQ) with packet combining, and for arbitrary values of the number of multi-SAW processes and maximum number of ARQ retransmissions.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128388198","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":"FPGA-based architecture of a DS-UWB Channel Estimator and RAKE Receiver employing a hybrid selection scheme","authors":"C. Thomos, G. Kalivas","doi":"10.1109/ICTEL.2010.5478836","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478836","url":null,"abstract":"A low-complexity architecture of a RAKE Receiver subsystem for a Direct Sequence Ultra-Wideband (DS-UWB) is presented, followed by FPGA implementation and system performance results. The proposed subsystem is composed of a Channel Estimator (CE) and a novel hybrid Partial/Selective (HPS) maximal ratio combining (MRC) RAKE Receiver (RR), which combines the benefits of both partial and selective RAKE receiver algorithms. The implementation of the HPS component is based on a parallel selection structure that picks the strongest multipath rays of the channel impulse response. Our work is focused on a highly parallel, modular design based on FPGA technology and optimized for high performance. The obtained results demonstrate the tradeoff between energy capture, performance and receiver complexity.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128668100","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":"A metaheuristic approach to spectrum assignment for opportunistic spectrum access","authors":"H. Salehinejad, S. Talebi, Farhad Pouladi","doi":"10.1109/ICTEL.2010.5478746","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478746","url":null,"abstract":"The prevalent static spectrum assignment brings forth spectrum holes and poor utilization in spectrum allocation. This issue has motivated researchers to introduce the open spectrum approach to spectrum access, which is enabled by software defined radio (SDR) technology. In this paper, an approximate nondeterministic ant colony based algorithm is proposed to resolve achieved spectrum allocation problems from NP-hard graph coloring problems (GCPs). This algorithm is a new approach to spectrum assignment problem versus traditional complex and heavy computational load, but with deterministic solutions algorithms.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127191623","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":"GA-based soft-decision decoding of block codes","authors":"I. Shakeel","doi":"10.1109/ICTEL.2010.5478650","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478650","url":null,"abstract":"In this paper, soft-decision decoding is considered as an optimisation problem and a computationally efficient soft-decision decoding algorithm for block codes is developed using a compact Genetic Algorithm. The performance of this algorithm is investigated and compared with other decoding schemes. The results show the proposed algorithm gives large gains over the Generalised Minimum Distance (GMD) decoding algorithm and algebraic hard-decision decoding in flat Rayleigh fading. Further, the proposed algorithm achieves near maximum likelihood decoder (MLD) performance for the codes simulated. The complexity of this algorithm is also discussed and compared to the standard Order-l reprocessing algorithm.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126530873","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":"On hierarchical collaborative content distribution over communication networks","authors":"A. E. Mouawad, S. Sharafeddine","doi":"10.1109/ICTEL.2010.5478840","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478840","url":null,"abstract":"Content distribution applications such as video streaming, file sharing, and network gaming are posing strict requirements on the development and enhancement of communications technologies, architectures, and protocols. Collaboration is one of the central techniques for designing enhanced communication networks. In this work, we address the problem of collaborative content distribution where destination nodes collaborate by sharing, over peer-to-peer connections or mobile-to-mobile links, data blocks received from a source node. We calculate the total number of possible distribution trees as a function of the number of data blocks and destination nodes for a two-level hierarchy, and generalize results to a multilevel hierarchy. Moreover, we develop a content distribution cost model and discuss special case content distribution scenarios.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114219437","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":"NES — Network Expert System for heterogeneous networks","authors":"S. Horsmanheimo, Jari‐Joonas Eskelinen, H. Kokkoniemi-Tarkkanen","doi":"10.1109/ICTEL.2010.5478789","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478789","url":null,"abstract":"Intelligent network monitoring and self-governing decision-making in heterogeneous networks has been an active research topic especially in related to audio/video delivery over multi-access networks. In this paper, we introduce a policy and rule based Network Expert System (NES) component to assist automated resource and mobility management. NES is one of the core components added to the Distributed Control and Management Framework (DCMF) presented in [1]. Here, we present the design of the NES as well as the results obtained from our proof-of-concept implementation. We also show that the Self-Organizing Map (SOM) based expert system utilized in NES is capable of providing solutions to resource and mobility management problems encountered in coexisting multi-operator networks.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116617596","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":"Silicon Nanophotonics Fabrication: An innovative graduate course","authors":"L. Chrostowski, N. Rouger, D. Deptuck, N. Jaeger","doi":"10.1109/ICTEL.2010.5478599","DOIUrl":"https://doi.org/10.1109/ICTEL.2010.5478599","url":null,"abstract":"We report our recent successful experiences related to the development of a transcontinental course in silicon photonics offered by the University of British Columbia in collaboration with CMC Microsystems. The course is offered to students from across Canada and has attracted participants from nearly every Canadian university with an advanced photonics research program. The focus of the course is the rapidly developing field of silicon photonics. Its aim is to provide the students with a breadth of competencies in designing optical circuits and systems using a silicon-on-insulator platform. The students taking the course gain familiarity in design, fabrication, and testing in an area of photonics that is destined to play an increasingly important, and in the long run ubiquitous, role in optical circuitry, impacting on areas such as optical interconnects, communications systems, and sensor systems. The course is structured using a blended-learning pedagogical approach consisting of an on-site workshop followed by design-based e-learning. The students' designs are fabricated using IMEC's passive photonic cSOI process, which is accessed through the European silicon photonics prototyping service ePIXfab. Student projects to date have included the design of integrated-optical circuits using combinations of ring resonators, waveguides, couplers, and photonic crystals for applications such as filters for WDM optical interconnects, demodulators for phase modulated signals, and lab-on-chip sensors.","PeriodicalId":208094,"journal":{"name":"2010 17th International Conference on Telecommunications","volume":"365 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121731171","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}