Andrey Tyarin and Sergey Tutelian defended their PhD theses

Wireless Networks Lab members Andrey Tyarin and Sergey Tutelian have successfully defended their PhD theses! On December 20, the the dissertation council at MIPT (Moscow Institute of Physics and Technology) awarded them their PhDs in Technical Sciences. Their supervisor, Evgeny Khorov, highly praises their work and the qualifications they have acquired.

The thesis by Andrey Tyarin “Methods of designing and determining the characteristics of unit cells of reconfigurable intelligent surfaces” focuses on RISs — a promising class of devices capable of increasing the throughput and coverage of wireless networks. A RIS is a flat, periodic structure consisting of unit cells whose characteristics can be programmatically configured, thereby controlling the electromagnetic wave reflected from the RIS. Andrey Tyarin describes methods for designing such cells and assessing their amplitude- and phase-frequency response. A significant practical result is the RIS prototype built by Andrey, which was able to increase the throughput of a 4G network on a user device in the field. The results have been published in 15 papers, including 3 articles in Q1 journals.

Andrey has been successfully researching RISs since 2021, working at the Wireless Networks Lab at the IITP RAS. While studying at MIPT, he acquired deep knowledge in physics, radio engineering, and telecommunications technologies. His ability to critically analyze scientific concepts, independently pose challenging scientific problems, and develop innovative approaches to solving them deserves special attention. He recently won the All-Russian competition “Science of the Future – Science of the Youth.” Andrey has definitely become a true scientist, capable of conducting high-level scientific research.

says his supervisor, Evgeny Khorov.

Sergey Tutelian’s thesis “Algorithms for Radio Resource Allocation in Wi-Fi Networks with Frequency and Power Division Multiplexing for Improving Quality of Service” addresses the problem of radio resource scheduling. In Wi-Fi networks, the average data download rate depends not only on the bandwidth and transmitter power but also on methods of multiple access, that is, on how limited network resources are distributed among multiple client stations. Orthogonal multiple access methods, such as OFDMA (orthogonal frequency division multiple access), have become the standard for radio resource management. Non-orthogonal multiple access methods (NOMA), such as power division multiple access, allow the same radio resources to be reused for transmitting different signals, and are therefore more efficient. Sergey Tutelian has proposed transmission management algorithms using OFDMA and NOMA. Notably, the performance of the algorithms has been evaluated taking into account realistic assumptions, such as channel frequency selectivity and the servicing the traffic of Internet of Things.

Sergey has proven himself to be a proactive and inventive young researcher. He possesses deep theoretical knowledge of network technologies, masters modern mathematical apparatus, and successfully applies it in practice. He is undoubtedly highly qualified and prepared for independent scientific research. He has already proven himself very well in research supported by grants from the Russian Science Foundation and in several industrial projects.

comments Evgeny Khorov.

We sincerely congratulate Andrey Tyarin and Sergey Tutelian on their successful defenses and wish them continued scientific success!