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Towards Cognitive Communications

Towards Cognitive Communications. A COST Action Proposal Mehmet Safak. Introduction. The heterogeneous networks will embrace cognitivity cross-layer protocol designs interoperability

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Towards Cognitive Communications

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  1. Towards Cognitive Communications A COST Action Proposal Mehmet Safak

  2. Introduction The heterogeneous networks will embrace • cognitivity • cross-layer protocol designs • interoperability • between cellular systems, wireless local area networks, wireless personal area networks, WiMax systems, sensor networks and digital audio and video broadcasting services.

  3. Introduction • The transmission and signal processing techniques to be studied include • ad hoc and wireless mesh networks, • cooperative communications, • fusion of telecommunication and broadcasting services, • cognitive radio and networks, • cross-layer protocol designs, • advanced transmission techniques, • hierarchical modulation, and • turbo equalization.

  4. Ad-hoc Networks and Wireless Mesh Networks • Ad-hoc networks • no pre-existing infrastructure • easy and fast to deploy, require low transmit power, and offer high frequency reuse • Wireless mesh networks • Infrastructure is fixed and regular • Infrastructure provides connectivity to other networks such as Internet, WiFi, WiMax, cellular, and sensor networks • Integration of heterogeneous wireless networks • Cross-layer designs

  5. Wireless Mesh Networks Infrastructure/backbone WMNs I. Akyildiz et al., Wireless mesh networks: a survey, Computer Networks, 47 (2005) 445–487

  6. Cooperative communications • RF communications, storage and distributed processing • Improved area coverage and QoS • Wireless (bio, environmental, and behavioral) sensor networks • Environmental monitoring, localization techniques, distributed measurements • Cross-layer design

  7. Telecommunications and Broadcasting • Fusion of telecommunications and broadcasting services • DVB-H • Internet TV • Digital TV reception by mobile communication terminals • Hierarchical modulation • Simultaneous voice, data and video transmission • DVB-T standard for HDT and standard-definition TV

  8. Adaptive Systems • Reactive • Adaptivity: self organization in changing environments and operating conditions • Adaptation strategies (bio-inspired, stochastic etc.) • from short-term adaptation to long-term evolution • imply changes in software, hardware, protocols and/or architecture. • Adaptive resource allocation, link adaptation

  9. Cognitive Radios and Networks • Cognitive radio depends on software-defined radio (SDR) to modify aspects of radio operation (e.g., RF bands, channel access modes, channel modulations, bandwidth, code, waveform), • Cognitive network,using a cognitive (proactive) process, • can observe, perceive current network conditions, then develop a capability to learn from past decisions and use this capability to optimize the end-to-end performance by changing one or more modifiable elements. • Needs cross-layer designs

  10. Cognitive Process Autonomous operation of cognitive element P.Demestichas et al., Introducing reconfigurability and cognitive networks concepts in the wireless world, IEEE Vehicular Technology Magazine, June 2006, pp.32-38

  11. Cognitive Radio Example of cognitive wireless network: elements may change radio access technology (RAT), frequency, or both, when new conditions are identified(P.Demestichas et al., Introducing reconfigurability and cognitive networks concepts in the wireless world, IEEE Veh. Tech. Mag., June 2006, pp.32-38)

  12. Cross-Layer Optimization • Timing adjustment, parameter exchange, and processing adaptation • PHY, MAC, data link layer (buffer capacity) and transport layer (routing) • Wireless mesh networks, smart antennas, cooperative communications and adaptive/cognitive systems • Adaptive transmission, resource allocation, QoS-based scheduling and retransmission • Modulation, coding, diversity, and other error control schemes

  13. Cross-layer Optimization Cross-layer design, adaptation and optimization K. B. Letaif, Y. Jun, Dynamic multiuser resource allocation and adaptation for wireless systems, IEEE Wireless Communications, pp.38-47, Agust 2006

  14. Advanced Transmission Techniques • UWB • OFDM • MIMO • Duplexing, resource allocation, scheduling • Multiple-access • Network coordination • Smart antennas • Turbo equalization

  15. Timetable • 75 top-ranked preliminary proposals will be invited to submit Full Proposals for approximately 25 new Actions • Full proposals will be invited by 11 May 2007 • Full proposals will be submitted by 27 July 2007 • Decisions expected in November 2007

  16. Thank you

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