Massive MIMO in Practice

Henrik Asplund received his MSc degree from Uppsala University, Sweden, in 1996 and joined Ericsson Research, Stockholm, Sweden, in the same year. Since then, he has been working in the field of antennas and propagation supporting predevelopment and standardization of all major wireless technologies from 2G to 6G. His current research interests include antenna techniques, radio channel measurements and modeling, and deployment options for 6G including higher frequencies.

David Astely is currently a Principal Researcher with Ericsson Research in the radio area. He received his PhD in signal processing from KTH Royal Institute of Technology in 1999 and has been with Ericsson since 2001, where he has held various positions in both research and product development.

Peter von Butovitsch joined Ericsson in 1994 and currently serves as Principal Researcher in the Business Area Networks. He has held various positions in Ericsson Research, Radio Access Network (RAN) development and Standards and Technology. From 1999 to 2014, he worked for Ericsson in Japan and in China. Most recently, he has been involved in issues relating to Massive MIMO and multi-antenna technologies. He holds an MSc in engineering physics and a PhD in signal processing, both from KTH, Royal Institute of Technology in Stockholm, Sweden. In 2016 he earned an MBA from University of Leicester, School of Business, in the United Kingdom.

Thomas Chapman is currently working within the radio access and standardization team within the Standards and Technology group at Ericsson. He has been contributing to 3GPP standardization since 2000 to the whole portfolio of 3GPP technologies, including UTRA TDD, WCDMA, HSPA, LTE, and NR, and has been deeply involved in concept evaluation and standardization of AAS in RAN4. He holds an MSc (1996) and PhD (2000) in electronic engineering and signal processing from the University of Manchester, UK.

Sebastian Faxér received his MSc degree in Applied Physics and Electrical Engineering from Linköping University in 2014. The same year, he joined Ericsson Research in Stockholm, Sweden, where he began working with multiantenna technologies for 4G and 5G in various roles spanning research, product management, and 3GPP standardization. From 2019 to 2024, he served as the Strategic Product Manager responsible for the functionality and strategy of Massive MIMO in Ericsson’s 5G and 4G products. Since 2024, he has been serving as the Chief Technology Officer (CTO) for Ericsson New Zealand.

Mattias Frenne is currently a Principal Researcher in multi-antenna standardization in Ericsson. He holds an MSc (1996) and a PhD (2002) in engineering physics and signal processing respectively, both from Uppsala University, Sweden. He has contributed to the physical layer concept development for both LTE and NR and is acting as a 3GPP Standardization Delegate in 3GPP RAN WG1 since 2005, mainly covering topics in the multi-antenna area. He was named Ericsson Inventor of the Year in 2016.

Farshid Ghasemzadeh received an MSc degree in electrical engineering from Chalmers University of Technology, Gothenburg, Sweden in 1994. He joined Ericsson in 1999 and currently has a position as “Senior Expert in Radio System Performance” within the Department of “Standards & Technology.” He has held various positions in Ericsson and worked with RAN system design and standardization. Before joining Ericsson in 1999, he worked for LGP Telecom as a Specialist in radio and microwave design developing radio products for various standards and technologies.

Billy Hogan joined Ericsson in 1995. His current position is Head of Radio Access and Propagation, Concepts and Algorithms within Business Unit Networks, where he leads a group that is researching radio network algorithms and concepts for 6G. Previously he had held various senior technical and leader positions within core and Radio Access Network Systemization and Design, including the role of Principal Engineer for Massive MIMO technology and strategy. He holds a BE in electronic engineering from the University of Galway, Ireland, and a MEng in electronic engineering from Dublin City University, Ireland.

George Jöngren is currently an expert in adaptive multi-antenna technologies at Ericsson. Starting with his PhD studies in 1999, he has two decades of experience working with state-of-the-art techniques in the multi-antenna field. He joined Ericsson in 2005 and has over the years had various roles, including working for 8 years as a 3GPP delegate driving Ericsson’s efforts on physical layer multi-antenna standardization. He holds a PhD in signal processing and an MSc in electrical engineering from the KTH Royal Institute of Technology, Stockholm, Sweden.

Jonas Karlsson joined Ericsson in 1993. Since then, he has held various technical and leader positions in Ericsson covering both radio access research and system management in product development. He is currently an Expert in Multi-Antenna Systems at Business Area Networks. He holds an MSc in electrical engineering and engineering physics from Linköping University, Sweden, and a PhD in electrical engineering from the University of Tokyo, Japan.

Fredric Kronestedt joined Ericsson in 1993 to work on RAN research. Since then, he has taken on many different roles, including system design and system management. He currently serves as an Expert, Radio Network Deployment Strategies, at Business Area Networks, where he focuses on radio network deployment and evolution aspects for 5G and 6G. He holds an MSc in electrical engineering from KTH Royal Institute of Technology, Stockholm, Sweden.

Erik Larsson joined Ericsson in 2005. He is currently a Senior Specialist working with concept development and network performance for NR with a focus on massive MIMO. He holds both an MSc in engineering physics and a PhD in electrical engineering, specializing in signal processing, from Uppsala University, Sweden.