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Cooperative Wireless Networking

Cooperative Wireless Networking. Elza Erkip Department of Electrical and Computer Engineering Polytechnic Institute of New York University. Motivation. Future of internet: Wireless Wireless channels Bandwidth limited Limited battery life devices Multi-user interference

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Cooperative Wireless Networking

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  1. Cooperative Wireless Networking Elza Erkip Department of Electrical and Computer Engineering Polytechnic Institute of New York University

  2. Motivation • Future of internet: Wireless • Wireless channels • Bandwidth limited • Limited battery life devices • Multi-user interference • Unreliable due to signal fading • Vulnerable to attacks • Multimedia applications • High data rates • Error sensitive, delay intolerant • How to overcome these obstacles?

  3. Cooperative Networking • Wireless devices helping each other communicate with other devices or fixed infrastructure • Cooperation provides a good solution to many of the problems arising in wireless systems

  4. How Does Cooperation Work? Mobile • Wireless antennas transmit in all directions • Signals transmitted towards the base station can be “overheard” at the relay • Relay processes this overheard information and re-transmits towards the destination • Total resources (energy, bandwidth) are same as non-cooperative case • Base station processes signals from both mobiles Base Station Relay

  5. Benefits of Cooperation • Robustness to fading • Opportunistic use of network energy and bandwidth • Higher data rates, fewer retransmissions so less network delay • Higher signal quality • Lower total transmitted energy which reduces interference and extends the battery life • Extended coverage

  6. Cooperative Networking Applications • Currently a “hot” research topic • Also interest in industry, standardization • 4G cellular • Applications • Cellular • Other mobiles can relay • Fixed (cheap) relays: Femtocells

  7. Cooperative Networking Applications • WiFi • Enterprise networking • Vehicular ad-hoc networks • Tactical networks

  8. Cooperative Networking Applications • Wireless Body Sensor Networks Figure from Sun et. Al, IEEE Wireless Communications Magazine, February 2010

  9. Poly’s Accomplishments • Poly has pioneered research in cooperative communications • IEEE paper award, cited extensively, top 10 downloaded article in IEEE Xplore • A. Sendonaris, E. Erkip and B. Aazhang. User cooperation diversity-Part I and Part II, IEEE TCOM 2003 • One of the first papers looking at system level issues • Top 100 downloaded article in IEEE Xplore • P. Liu, Z. Tao, Z. Lin, E. Erkip and S. Panwar. Cooperative wireless communications: A cross-layer approach, IEEE Wireless Magazine, 2006. • IEEE ICC Conference Best Paper • M. Yuksel and E. Erkip. Diversity-multiplexing tradeoff in half-duplex relay systems, Proceedings of ICC, 2007. • One of the first groups to implement a cooperative networking testbed

  10. Cooperative Networking @ Poly • Goal: A complete cooperative networking solution • Establish the theory • Develop algorithms • Study applications • Implementation • Multiple Poly faculty and students • Bertoni, Erkip, Knox, Memon, Panwar, Wang • Government and industrial funding

  11. Testbed Facilities

  12. Testbed Facilities

  13. Experimental Results

  14. Conclusions • Cooperation: Paradigm shift in wireless communications • Offers • Spatial diversity • Higher throughput • Lower delay • Reduced energy consumption • Extended coverage • Higher quality multimedia • Improved security • Cooperation in 4G cellular wireless standards • Many exciting projects studying cooperation at all layers of the protocol stack • Theory + implementation • Still many challenges

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