Jad Nasreddine's Home page: Research Lines

Short CV

Jad Nasreddine received the engineering degree in computer science and telecommunications in 2001 from the Lebanese university, faculty of engineering. In March 2005, he received the Ph.D degree in computer science from the university of Rennes 1. During his PhD, he was assistant researcher in the ENST Bretagne-Rennes. Between April 2005 and January 2006, he was a post-doctoral researcher in the same university, working on frequency managment methodologies in collaboration with UPC (Universitat Politecnica de Catalunya) in the framework of the European Network of Excellence NEWCOM. In February 2006, he joined the Signal Theory and Communications department (TSC) of UPC as a research associate in the framework of the European IST project E²R II.

Research Keywords

ASM (Advanced Spectrum Management)
CN (Cognitive Network)
CR (Cognitive Radio)
DCA (Dynamic Channel Allocation)
DFM (Dynamic Frequency Allocation)
DSA (Dynamic Spectrum Allocation)
FSM (Flexible Spectrum Allocation)
PC (Power control)
RRM (Radio Resource Management)
Shadowing models
TDD (Time Division Duplex)

His research interests include radio resource management and advanced spectrum management in next generation wireless networks, cognitive networks and performance evaluation of cellular systems.

Thesis Abstract [PDF]

In systems using CDMA technique, users share the same bandwidth. Therefore, these systems are interference limited and the most important procedure to increase system capacity and ameliorate QoS level is interference management. In systems using pure CDMA technique, power control is a widely used procedure for decreasing interference and upholding required QoS levels. In addition to power control, the combination of TDMA and TDD techniques with CDMA provides a new degree of flexibility in interference management using slot allocation techniques. However, exploiting this flexibility induces new challenges to mitigate such as the presence of pernicious mobile-to-mobile interference.

				In this thesis, we exploit the flexibility of TDMA-CDMA/TDD systems and the characteristics of the CDMA technique. We propose power control algorithms combined with slot allocation techniques in order to provide required QoS levels for users. First, we develop a simple generic optimum power control algorithm and we propose different schemes using this algorithm. The developed model can be applied to uplink, downlink and crossed slots to evaluate system performance and can be used to design efficient distributed algorithms.

	Publications SLot Allocation Power control

Moreover, we propose simple modifications to the standardized closed-loop power control of the UMTS. The proposed modifications lead to a significant increase in system performance without increasing system complexity and signaling traffic. We also propose heuristic and meta-heuristic methods combining the optimum power control and slot allocation techniques to find the upper bound of system performance in TDMA-CDMA/TDD systems. These methods can be adapted to real systems using radio interface measurements. Finally, we investigate flexible slot allocation techniques to avoid high interference that can appear in systems supporting heterogeneous services and asymmetric traffic between uplink and downlink (i.e. mobile-to-mobile interference).



	- J. Nasreddine, X. Lagrange, "On The Computation of the Maximum Capacity of TDMA-CDMA/TDD Systems," in Proceedings of the 17th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Helsinki, Finland, September 2006, - J. Nasreddine and X. Lagrange, "Performance of TD-CDMA systems during crossed slots," in Proceedings of the 60th IEEE Semiannual Vehicular Technology Conference, Los Angeles, USA, Septembre 2004, - J. Nasreddine and X. Lagrange, "Time Slot Allocation Based on Normalized Path Gain for TDCDMA TDD Systems," in Proceedings of the 1st International conference on Information & Communication technologies: From theory to Application, Damascus, Syria, 2004, - J. Nasreddine, X. Lagrange, "Time slot allocation based on a path gain division scheme for TD-CDMA TDD systems," in Proceedings of the 57th IEEE Semiannual Vehicular Technology Conference, Jeju, Korea, April 2003, pp 880-884, - J. Nasreddine, X. Lagrange, "Comparison of different slot allocation schemes in a TD-CDMA TDD system," in Proceedings of the second IEEE Workshop on Applications and Services in Wireless Networks, Paris, France, July 2002, - J. Nasreddine, X. Lagrange, "Power control and slot allocation in a TD-CDMA system," in Proceedings of the 55th IEEE Vehicular Technology Conference, Birmingham, Al, USA, May 2002, pp 880-884.



	- J. Nasreddine, Loutfi Nuaymi and X. Lagrange, "Adaptive Power Control Algorithm with Stabilization Zone," Annals of telecommunications, Vol. 61 n°9-10, Sept-Oct 2006 - J. Nasreddine and X. Lagrange, " A Simplified Generic Optimum Power Control Scheme for CDMA Cellular Systems," in Proceedings of the IEEE Workshop on Adaptive Wireless Networks (in conjuction with GLOBECOM 2004), Dallas, USA 2004, - J. Nasreddine, L. Nuaymi and X. Lagrange, " Downlink Adpative Power Control Algorithm for 3G Cellular CDMA Networks," in Proceedings of the 15th IEEE international symposium on personal, indoor and mobile radio communications conference, Barcelona, Spain, 2004, - J. Nasreddine, L. Nuaymi and X. Lagrange, " Adaptive Power Control Algorithm for 3G Cellular CDMA Networks ," in Proceedings of the 59th IEEE Semiannual Vehicular Technology Conference, Milan, Italy, May 2004