BEGIN:VCALENDAR PRODID:-//eluceo/ical//2.0/EN VERSION:2.0 CALSCALE:GREGORIAN BEGIN:VEVENT UID:a1f6c19e225adeac66e255d9db2a82fe DTSTAMP:20260511T175723Z SUMMARY:Disputation i kommunikationsteknologi DESCRIPTION:Kontakt: susanna.lonnqvist@eit.lth.se\n\n \;Ashkan Sheikhi improved wireless systemsDescribe your research in a popular science wayIt has been more than two decades since we passed the point when the majorit y of earth's population connected to the internet and gained full access t o mobile communications. The number of connected devices\, however\, has b een constantly and rapidly growing due to the emerging applications and se rvices\, such as smart vehicles\, smart homes\, self-controlled robot work ers\, remote-controlled machinery\, and so on. During recent years\, not o nly has the number of connected devices increased rapidly\, but also the a mount of information transmitted by each device over the wireless networks . Therefore\, the demands on the network are increasing significantly dail y and the advancements in wireless technology are constantly struggling to keep up with the level of users demands. \;Massive MIMO (Multiple-Inp ut Multiple-Output) and LIS (Large Intelligent Surface) are two of the maj or key technologies in the recent wave of advancements in 5G and 6G wirele ss networks. The performance gain from deploying these systems highly depe nds on the possibility of increasing the number of transmissions and havin g antennas receive up to hundreds or thousands of elements. While in theor y there can be infinite gain from scaling up these systems\, deploying hun dreds to thousands of transceiver chains with high-end hardware components limits the scalability of massive MIMO in terms of cost efficiency. Reduc ing the requirements on hardware components quality while maintaining the system performance is of great importance to enable the scalability of mas sive MIMO for future wireless networks. In this thesis\, we focus on scali ng up massive MIMO and beyond with imperfect transceivers. In particular\, we study the performance of massive MIMO and LIS systems with imperfect h ardware components to analyze the scalability of these systems in practice . We also propose solutions to optimize the system performance while consi dering the non-ideal effects in hardware components. We propose compensati ons schemes to mitigate the effects of imperfect transceivers\, and we sho w that by adopting the proposed schemes\, we can improve the overall syste ms efficiency\, which paves the way for scaling up massive MIMO systems to meet the increasing demands in future wireless networks. \;What made you want to pursue a PhD?I think research is fun simply because it involve s a lot of creativity and imagination. Researchers have the possibility to learn new useful things everyday which I find enjoyable. After finishing a master's degree in wireless communications\, I wanted to work as a resea rcher in this field\, and doing a PhD in Sweden was the perfect choice for me. The PhD journey has a lot of ups and downs\, more than you can imagin e\, but it is well worth it.Do you believe some results from your research will be applied in practice eventually? And if so\, how / how?One of the main motivations of this work is to facilitate the implementation of massi ve MIMO and LIS systems for future wireless networks. In general\, the the sis focuses on analysing and compensating the effect of deploying non-idea l hardware components in practical wireless transceivers for massive MIMO and beyond. Therefore\, this thesis directly aims to bridge the gap betwee n theory and practice. As an example\, one of the key ideas in the thesis has been selected by Ericsson company in Sweden to file a patent applicati on\, which is recently granted. I hope the content of the thesis can bring more insight into practical implementation of massive MIMO and LIS for 5G and 6G.Länk till avhandlingen (på engelska\, Lunds universitets forskni ngsportal) \;\n\nMer information om händelsen: https://www.eit.lth.se /evenemang/disputation-i-kommunikationsteknologi-0 DTSTART;TZID=GMT:20250919T071500 DTEND;TZID=GMT:20250919T093000 LOCATION:E-huset\, E:1406 END:VEVENT END:VCALENDAR