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Witold Krzymien

Rohit Sharma Professor


Electrical and Computer Engineering

About Me

Witold A. Krzymień received his MSc (Eng.) and PhD degrees from the Poznań University of Technology, Poznań, Poland, in 1970 and 1978, respectively, both in electrical engineering. He received a Polish national award of excellence for his PhD thesis.

Since April 1986 he has been with the Department of Electrical and Computer Engineering at the University of Alberta, Edmonton, Alberta, Canada (since July 1991 as a full Professor). Since July 2003 he has held the endowed Rohit Sharma Professorship in Communications & Signal Processing, the only endowed professorship in the Department created for him in 2003 by his former graduate student, Dr. Rohit Sharma. In 1986, he was one of the key research program architects of the newly launched Telecommunications Research Laboratories (initially known as ATRC, than TRLabs and finally as TRTech), which for the following three decades were one of Canada’s largest industry-university-government pre-competitive research consortia in the Information and Communication Technology area. His research activity was closely tied to the consortium throughout its existence.

Over the years he has also done collaborative research work with TELUS Communications, Huawei Technologies, Nortel Networks, Ericsson, German Aerospace Centre (DLR - Oberpfaffenhofen) and the University of Padova (Italy). He held visiting research appointments at the Twente University of Technology (Enschede, The Netherlands; 1980-1982), Bell-Northern Research (Montréal, Canada; 1993-1994), Ericsson CDMA Systems (San Diego, USA; 2000), Nortel Networks Harlow Laboratories (Harlow, UK; 2001), and the Department of Information Engineering at the University of Padova (2005). His research is currently focused on radio resource management and transceiver signal processing for broadband heterogeneous cellular networks employing multi-user MIMO and massive MIMO antenna techniques.

Dr. Krzymień is a Fellow of the Institute of Electrical & Electronics Engineers (IEEE), a Fellow of the Engineering Institute of Canada, and a licensed Professional Engineer in the Provinces of Alberta and Ontario, Canada. He is an Editor of the IEEE Transactions on Vehicular Technology and from 2000 to 2003 he was the Editor for Spread Spectrum and Multi-Carrier Systems of the IEEE Transactions on Communications. From 1999 to 2005 he was the Chairman of Commission C (Radio Communication Systems and Signal Processing) of the Canadian National Committee of URSI (Union Radio Scientifique Internationale). He has chaired or co-chaired technical program committees for numerous conferences in wireless communication systems and communication theory areas. He has received several awards for his papers published in prominent archival research journals and in proceedings of renowned international technical conferences. 


Research Interests

The scope of Professor Krzymień’s research interest and activity primarily encompasses transceiver signal processing and radio resource management techniques underlying the evolution of wireless and especially cellular systems and networks towards future multi-usage systems and networks that in their shorter-term phase of development are known as the fifth generation (5G) cellular. Emphasis of the research is on approaches enabling very high-throughput, spectrally and energy efficient, and flexibly asymmetric packet data access and their role in shaping the future broadband heterogeneous cellular networks. The work attempts to balance methods and solutions of the physical and MAC/RLC (medium access control and radio link control) layers of the system architecture, and those concerned with network layer related problems, such as cooperative relaying and coordinated multipoint transmission/reception, also known as network MIMO (multiple-input multiple-output) technique. An integrated, cross-layer approach is applied in arriving at effective system-level solutions. 

Current Research

• Centralized and distributed reduced-complexity transmission precoding, scheduling and resource allocation algorithms for multi-layer heterogeneous cellular networks (HetNets) employing multiple-antenna techniques. 

• Multi-user MIMO and very large antenna array (massive) MIMO systems with particular emphasis on their deployment in HetNets.

• Modelling, design and performance evaluation of multi-layer heterogeneous cellular networks using stochastic geometry methods.

• Coordinated cellular transmission/reception (network MIMO) to achieve MIMO spatial multiplexing gains in interference-limited cellular systems.