Eng. Samy SOLIMAN, Teaching Assistant at EECE & PhD Candidate at the University of Alberta (Canada), will give a talk on May 21st, 2013. Details for the talk are as follows:

Date and Time: Tuesday, 21 May 2013 - 10:00 am

Place:  Library Room, EECE Department, Cairo University

Title: 
On the Exact Analysis and Design of Dual-Hop, Maximum End-to-End SNR Relay Selection, and Full Selection Dual-Hop AF Systems

Abstract :

Wireless cooperative networks have recently attracted the focus of many researchers as well as industry developers because such networks promise a large diversity gain and an increased capacity compared to other wireless systems. The most popular and studied relaying techniques are amplify-and-forward (AF) or equivalently and decode-and-forward (DF). DF relaying requires more processing at the relay nodes than AF and the complexity and power consumption are disadvantages. Once the destination receives all the different versions of the signal, through the direct path and the relays, they are combined together through any of the well known receiver diversity combining techniques. Accurate performance analysis of cooperative diversity systems is now important since it enables the design of networks for maximum utility and performance.

In this seminar, a general framework is developed to obtain new, exact closed-form expressions for the probability density function (PDF) and the cumulative distribution function (CDF) of the instantaneous end-to-end signal-to-noise ratio (SNR) of dual-hop, variable gain, amplify-and-forward (AF) relaying systems over Rayleigh, Nakagami-m and Rician fading channels, as well as systems operating over mixed Nakagami-m and Rician fading links. These expressions are used to obtain new exact closed-form expressions for the PDF and the CDF of the instantaneous end-to-end SNR of opportunistic dual-hop AF systems in which the relaying node is selected from N available relays based on a maximum end-to-end SNR policy. Exact expressions for the PDF and the CDF of the instantaneous end-to-end SNR of full selection dual-hop AF systems, in which the direct path between the source and the destination is included in the selection procedure, are also obtained.

Performance metrics are calculated using the derived PDF and CDF expressions. Simulation results are used to verify the obtained solutions. The exact results permit accurate comparisons of the performance of dual-hop AF relaying systems without relay selection, opportunistic dual-hop AF relaying systems with relay selection, and dual-hop AF relaying systems with full selection. It is found that dual-hop AF relaying systems with relay selection outperform dual-hop AF systems without relay selection, and that they provide a diversity gain, proportional to the number of relays, over conventional dual-hop AF relaying systems. It is shown also that full selection dual-hop AF systems outperform both of the other two systems and that they provide a higher diversity gain. Adaptive transmission systems are also studied and closed form expressions for the ergodic capacity are obtained for different adaptive techniques.

Brief Bio:

Samy S. Soliman (S’08) received the B.Sc. (honors) and M.Sc. from Cairo University, Egypt, in 2007 and 2009, respectively. He was awarded the Cairo University award of Eng. Nabil El-Gebaly and the Cairo University award of Eng. Reda Hamza both in 2008.

Mr. Soliman worked as a Teaching and Research Assistant at the Electronics and Electrical Communications Department, Cairo University, as well as at the Electronics Engineering Department, AUC, from 2007 to 2009. In 2009, Mr. Soliman joined the AITF Wireless Communications Laboratory (iWCL) in 2009 as a Research Assistant and is currently a Ph.D. candidate at the University of Alberta, Canada. He is a recipient of the Professional Development Award from the University of Alberta twice in June 2012 and April 2013. He was also awarded an IEEE Student Grant in May 2012.

His research interests include wireless cooperative networks, multiple input multiple output (MIMO) systems, wireless sensor networks, and ultra-wide bandwidth wireless systems. Mr. Soliman is a student member of the IEEE Communications Society as well as the IEEE Vehicular Technology Society. He has served as a peer reviewer for the IEEE ICC 2012, 2013 conferences, the IEEE WCNC 2012, 2013 conferences, the IEEE GLOBECOM 2012, 2013 and VTC fall 2012, spring 2012 and fall 2013 conferences. He serves also as a peer reviewer for the IEEE Transactions on Communications; IEEE Transactions on Signal Processing; IEEE Transactions on Vehicular Technology; IEEE Transactions on Wireless Communications, IEEE Communication Letters and the International Journal of Systems, Control and Communications.