Witold A. Krzymień – Research Interests

The scope of Dr. Krzymień’s research interest and activity primarily encompasses signal processing and radio resource management techniques underlying the evolution of wireless and especially cellular systems and networks towards future broadband systems and networks that in their shorter-term first phase of development are known as the fourth generation 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 systems. 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) techniques. An integrated, cross-layer approach is applied in arriving at effective system-level solutions.

Current Research

·         Multi-user MIMO (multiple-input multiple-output) and MIMO-OFDM (orthogonal frequency division multiplexing) systems with particular emphasis on cellular downlink transmission.

·          Infrastructure-based MIMO relaying for improved coverage and capacity of broadband cellular systems.

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