LUMS School of Science and Engineering (EE)

 

Cordially invites you to a talk by

                                                                                        

Dr. Ijaz Naqvi

 

on

 

" Application of Time Reversal Technique to Ultra Wideband and MIMO Communication Systems"

 

 

Time: 3:00 PM

Date: Friday 12^th March, 2010

Venue: 10 - 401 SSE Building

 

 

Abstract:

 

In ultra wideband (UWB) systems, extremely narrow RF pulses are employed to communicate between transmitters and receivers. Because of their extremely wide bandwidth, UWB signals result in large number of resolvable multi-paths and thus reduce the interference caused by the superposition of these multi-paths. However, it also requires a complex receiver system. Time reversal (TR) is a transmission approach which permits to detect the received signal with simple receivers by shifting the complexity to the transmitter. The received signal in the TR scheme is very focused in time and spatial domains. Temporal and spatial focusing permit to reduce inter symbol interference and multiuser interference respectively.

 

In this work, we investigate TR UWB scheme and its application to high data rate communication. A validation of the TR scheme in the laboratory is performed and a parametric study of TR is carried out with single and multiple antenna configurations (MIMO). The robustness of the TR scheme is also studied in a non stationary environment. 

 

Furthermore, TR scheme is investigated from the communication point of view. Experimental validations of a new modulation scheme and high data rate communication for TR UWB are performed for dense multipath propagation channels. Finally, multiuser TR communication has also been studied during the course of this thesis. The results suggest that the TR UWB is a promising and attractive transmission approach for future wireless local and personal area networks (WLAN & WPAN).

 

About the Speaker:

 

PhD in Electronics and Telecommunication: December 2009, from National Institute of Applied Sciences (INSA) of Rennes, France under the Ministerial scholarship of French Ministry of Research. Masters in Radio Communication: September 2006, from SUPELEC Gif-sur-Yvette France. BSc Electrical Engineering 2003: from UET Lahore.

Important Research Publications:

 

I. H. Naqvi, G. El Zein, G. Lerosey, J. de Rosny, P. Besnier, A. 

Tourin, M. Fink, Time Reversal UWB Communication: Experimental Study for High Data Rates in Dense Multipath Propagation Channels, IET Journal of Antenna and Propagation (In press)

 

I. H. Naqvi, A. Khaleghi, G. El Zein, Time Reversal UWB Communication

System: A Novel Modulation Scheme with Experimental Validation, Eurasip Journal on Wireless Communications and Networking (In press)

 

I. H. Naqvi, P. Besnier, G. El Zein, "Effects of Time Variant Channel on Time Reversal UWB System, Proceedings of The IEEE Global Communication Conference (IEEE GLOBECOM 2009), 30 November-4 December, 2009, Honolulu, Hawaii, USA

 

I. H. Naqvi, A. Khaleghi, G. El Zein, "Multiuser Time Reversal UWB Communication System: A Modified Transmission Approach, The 20th IEEE International Symposium On Personal, Indoor and Mobile Radio Communications (PIMRC 09)