Multiple Obstruction Uniform Theory of Diffraction and its Application to Radio Channel Modeling
|Τίτλος||Multiple Obstruction Uniform Theory of Diffraction and its Application to Radio Channel Modeling|
|Ημερομηνία||Παρασκευή 19/10/2007, ώρα 13:00|
|Χώρος||Αμφιθέατρο Σαράτση, στο Κτίριο Δελμούζου, Παραλιακό Συγκρότημα Παπαστράτου|
|Διεύθυνση||Αργοναυτών και Φιλελλήνων, Βόλος|
George Koutitas was born in Thessaloniki, Greece. He received the B.Sc. degree in Physics from Aristotle University of Thessaloniki, Greece in 2002, the M.Sc. degree in Mobile and Satellite Communications (with Distinction) from the University of Surrey, UK in 2003 and the PhD from University of Surrey in 2007. He worked as a member of the Centre for Communications Systems Research (CCSR) where he focused his research interests in the area of wireless channel modeling specializing on the electromagnetic wave propagation techniques.
The Uniform Theory of Diffraction (UTD) is one of the most preferred high frequency asymptotic techniques for radio channel modeling. In this presentation, UTD is investigated and extended to scenarios of multiple diffraction from a cascade of two dimensional multi-shaped canonical objects such as wedges, knife-edges and cylinders. The heuristic slope UTD solution can give accurate and uniform field predictions at any area point and for any kind of environments. The solution is then compared against measurements taken in an anechoic chamber and a very good agreement is observed. Furthermore, an algorithm for implementing the proposed UTD solution to rural area field predictions is also presented, based on a novel algorithm for optimum fit of canonical shapes to the terrain irregularities. Comparisons between the model and measurements taken in real terrain profile show a very good agreement and uniform field predictions. The importance of the choice of the used canonical object to terrain modeling is also discussed since different diffraction patterns are observed for different combination of the canonical objects. Finally, the multiple obstruction UTD algorithm is implemented for urban and indoor propagation scenarios showing high accuracy and low CPU demands.