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Radio systems



Our competence in radio systems can be divided into two areas. The first includes methods and algorithms for efficient radio interfaces and digital transceivers. Moreover, radio link modelling and simulation are important research methods in this area. The second area comprises methods and architectures of advanced networking concepts, including network layer performance optimisation. Our strengths are in the physical layer digital algorithms as well as in co-operative and cognitive networking. Strong physical layer background gives a good basis for studying other layers.


The challenges of future advanced wireless and mobile communication systems include the need for increased performance, usability, autonomy, security, and embedded low cost solutions. In addition, it is essential to improve the efficiency in the use of resources, particularly, but not limited to, spectral and energy efficiency. Cost efficient technologies are studied for wireless wide area, metropolitan area, and short-range networks and terminals, including International Mobile Telecommunications-2000 (IMT-2000) and International Mobile Telecommunications - Advanced (IMT-Advanced), Long Term Evolution (LTE), Worldwide Interoperability for Microwave Access (WiMAX), wireless local area networks (WLAN), wireless personal area networks (WPAN), and their evolution.

Solutions and Benefits

We have extensive experience in research, evaluation, development and prototyping of adaptive multi-carrier techniques, including orthogonal frequency division multiplexing (OFDM) and orthogonal frequency division multiple access (OFDMA). We have also investigated configurable multiple input multiple output (MIMO) processing, ultra wideband (UWB) transmission methods, modelling and pre-distortion of nonlinearities, joint optimisation of capacity, coverage and quality, cross-layer design and adaptive transmission, dynamic spectrum management, advanced networking concepts; mesh, grids, relays, co-operating and cognitive access networks and terminals. The benefits include high-performance cost-efficient wireless networks and terminals for wide area, metropolitan area, and short-range applications.

References and merits

We have developed methods, transceiver concepts and prototyping for 3G, 3G+/LTE and 4G mobile communication systems. We have also been involved in the development and prototyping of transceiver concepts for WiMAX radios and networks. In addition, methods, transceiver concepts and prototyping of wireless local area networks (WLAN), transceiver concepts and digital signal processing algorithms for microwave radios, transceiver concepts and digital signal processing algorithms for high speed (2 Gbit/s) short-range UWB radios, spectrum sensing, cognition, adaptation dynamic spectrum, management methods for cognitive networks have been studied.

Additional information

Kyösti Rautiola
Research Team Leader
+358 20 722 2428

Aarne Mämmelä
Research Professor
+358 20 722 2482