Access Technologies
Overview
The Access Technologies (AT) Area is devoted to the study, design, and optimization of Access Networks. It is structured into two core research lines:
The Cognitive and Multicarrier Networks Research Line aims at improving the performance and robustness of wireless access systems, including Local and Wide Area Networks (mainly based on 802.11/16 technology) as well as cellular networks (3GPP UMTS and LTE-A). Its core objectives are the design of intelligent, cognitive network architectures that are able to optimize the resource allocation either in a centralized or a distributed fashion. In order to achieve this goal, properties of advanced multi-carrier radio interfaces, including filter banks and single-carrier with frequency domain equalization are exploited. This research line also focuses on purpose-driven networks such as wireless sensor networks, vehicular networks, and satellite broadband and mobile systems. Advanced mathematical tools from optimization theory, game theory, machine learning and detection and estimation theory are widely used to solve the problems described.
The Network Information Theory Research Line studies the theoretical limits on the capacity of networks, with a special interest on wireless scenarios. Wireless networks are evolving from single to multiple wireless hops, and their performance is being pushed closer to their physical limits. We use network information theory to produce results on the limits of achievable capacity of these networks, which provide useful insights into the design of practical systems. This research line also focuses on the design of coding and transmission schemes at a network level, also known as network coding. Finally, another area of interest is joint source-channel coding for enhanced multimedia transmission.
Application-driven research also falls within the scope of the AT Area, mainly in the areas of health, intelligent transportation systems, and machine-type communications in general.
For up-to-date information, recent news, and upcoming events, visit the Wiki of the Access Technology Area.
Publications
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Hamza Soury, F. Bader, M. Shaat, and M. Slim Alouini, Near Optimal Power Allocation Algorithm for OFDM-Based Cognitive Using Adaptive Relaying Strategy, the 7th International Conference on Cognitive Radio Oriented Wireless Networks (CrownCom'2012), June 18–20, 2012 Stockholm (Sweden). -
A. Moragrega, P. Closas, C. Ibars, Energy-Efficient Positioning in Sensor Networks by a Game Theoretic Approach, in Proceedings of 19th European Signal Processing Conference (EUSIPCO 2011), 29-2 September 2011, Barcelona (Spain).
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A. Moragrega, P. Closas, C. Ibars, LACFA: An Algorithm for Localization Aware Cluster Formation in Wireless Sensor Networks, EURASIP Journal on Wireless Communication and Networking, special issue on Localization in Mobile Wireless and Sensor Networks 2011, 2011:121 doi:10.1186/1687-1499-2011-121 -
J. P. Leon, F. Bader, M. Slim Alouini, Energy Scope of Handoff Strategies in Macro-Femtocell Environments, in Proceedings of the IEEE International Conference on Communications (ICC'2012), 10-15 June 2012, Ottawa (Canada).
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M. Shaat, F. Bader, Asymptotically Optimal Subcarrier Matching and Power Allocation for Cognitive Relays With Power and Interference Constraints, in Proceedings of IEEE Wireless Communications and Networking Conference (IEEE WCNC'2012), 1-7 April 2012 Paris (France).
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M. Shaat, F. Bader, Joint Resource Optimization in Decode and Forward Multi-Relay Cognitive Network With Direct Link, in Proceedings of IEEE Wireless Communications and Networking Conference (IEEE WCNC'2012), 1-7 April 2012 Paris (France).
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J. Peña Leon, F. Bader, M. Slim Alouini, Per-energy Capacity and Handoff Strategies in Macro-Femto Cells Environment, in Proceedings of IEEE Wireless Communications and Networking Conference,(WCNC'2012), 1-4 April 2012, Paris (France).
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M. Shaat, F. Bader, Asymptotically Optimal Resource Allocation in OFDM-Based Cognitive Networks with Multiple Relay, IEEE Transactions on Wireless Communications, Vol.11, No.3, pp.892-897, March 2012.
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M. Navarro, L. Giupponi, C. Ibars, D. Gregoratti, J. Matamoros, Distributed Algorithms for Demand Management and Grid Stability in Smart Grids, Chapter in "Communication and Networking in Smart Grids", edited by Y. Xiao, ISBN: 978-1-4398-7873. -
T. Predojev, J. Alonso-Zárate, M. Dohler, Energy Efficiency of Cooperative ARQ Strategies in Shadowing Environments, in Proceedings of IEEE Infocom 2012, Workshop on Communications and Control for Sustainable Energy Systems: Green Networking and Smart Grids, 25-30 March 2012, Orlando, Florida (USA).
