The Department of Computer Science at the University of Cyprus cordially invites you to the Colloquium entitled:

Cross Layer Rate Adaptation in Wireless Ad-hoc Networks


Speaker: Dr. Emmanouil G. Spanakis
Affiliation: University of Cyprus, Cyprus
Category: Colloquium
Location: Room 148, Faculty of Pure and Applied Sciences (FST-01), 1 University Avenue, 2109 Nicosia, Cyprus (directions)
Date: Monday, October 4th, 2010
Time: 14:00-15:00 EET
Host: Marios Dikaiakos (mdd AT and George Pallis (gpallis AT

In a wireless network, with nodes sharing the same spectrum, each transmission is affected from, and affects, all other transmissions in range. When multiple uncoordinated links share a common medium the effect of interference is a crucial limiting factor for network performance. The general objective of this work is to present an in-depth analysis of how cross layer techniques can be used in the design and study of wireless ad hoc networks. We focus on finding how adapting various parameters of the telecommunication system can allow concurrent transmissions, minimize interference, enhance network throughput, maximize individual link data rates, and optimally utilize the network resources for all competing transmissions. Initially, we study the transmission rate regions for a simplified wireless network with a given degree of interference, considered as noise, and individual power constrains. We define the necessary conditions that maximize the system’s aggregate rate and provide criteria under which simultaneous link operation outperforms timesharing. Then, we study the interference exhibited at the center of a circular networking area and define the interference limited communication range to be the critical communication region around a receiver within which a successful communication link can be formed. Finally, we examine the multicast throughput of a group and show its dependence on the transmission rate.

Short Bio:
Emmanouil G. Spanakis is a post-doctoral fellow at the Computer Science department in University of Cyprus under the Marie Curie Transfer of Knowledge program. He holds a B.Sc. and a M.Sc. in Computer Science and he received his Ph.D degree in Computer Science in 2009 from the University of Crete, Heraklion, Greece. Since 1998, he has been a member of the Telecommunications and Networks Laboratory and the Biomedical Informatics Laboratory of FORTH- ICS as a research intern in many collaborative R&D projects in the area of wireless communication networks, wireless ad hoc networks and ambient intelligence e-health environments. He has expertise and specialisation on issues of the wider scientific domain of wireless communication networks and computational medicine, and in particular on cross layer design in wireless ad-hoc networks, wireless interference channel under SINR constrains, performance and analysis of mobile ad-hoc routing protocols, wireless network measurements analysis as well as in biomedical informatics, wireless medical sensors and ambient e-health and m-health related services.

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Sponsor: The CS Colloquium Series is supported by a generous donation from Microsoft