Reserach and development of solutions for performance improvements of wireless communication systems in microvawe and millimeter frequency bands

1. The modeling of mobile radio channel in real environment in the presence of fading, shadowing and interference and finding solutions for upgrading of wireless communication systems performance. 2. Development of efficient models, based on artificial neural networks, for adaptive antenna structures and EM wave propagation. Development of special antenna structures. Electromagnetic compatibility (EMC) problems solving through development of suitable numerical tools and experimental methods. Design and development of indoor EMC measurement. 3. Development and application of advanced modeling techniques, based on artificial neural networks, for the design of wireless communications circuits. Experimental verification of the developed methods for linearization of Doherty amplifiers. 4. Microwave structure modeling and response calculation by using wave digital approach. Combining of EM and wave digital approach with methods for lumped circuit analysis for efficient design, modeling and optimization of fast analog and digital electronic circuits in modern systems. Utilization and developments of new numerical methods for applied electromagnetic applications. Development of broadband microwave bandpass filter. 5. Research, development and realization of a new high capacity link in millimeter range at about 80 GHz, for solving actual problem of interference and increase the transfer capacity in modern wireless 3G and 4G networks.