Abstract
Over the last decade the world of wireless communications has been undergoing
some crucial changes, which have brought it at the forefront of international research and
development interest, eventually resulting in the advent of a multitude of innovative
technologies and associated products such as WiFi, WiMax, 802.20, 802.22, wireless mesh
networks and Software Defined Radio. Such a highly varying radio environment calls for
intelligent management, allocation and usage of a scarce resource, namely the radio
spectrum. One of the most prominent emerging technologies that promise to handle such
situations is Cognitive Radio. Cognitive Radio systems are based on Software Defined Radio
technology and utilize intelligent software packages that enrich their transceivers with the
highly attractive properties of self-awareness, adaptability and capability to learn. The
Cognitive Engine, the intelligent system behind the Cognitive Radio, combines sensing,
learning, and optimization algorithms to control and adapt the radio system from the
physical layer and up the communication stack. The integration of a learning engine can be
very important for improving the stability and reliability of the discovery and evaluation of
the configuration capabilities. To this effect, many different learning techniques are
available and can be used by a Cognitive Radio ranging from pure lookup tables to
arbitrary combinations of soft Computing techniques, which include among others:
Artificial Neural Networks, evolutionary/Genetic Algorithms, reinforcement learning, fuzzy
systems, Hidden Markov Models, etc. The proposed work contributes in this direction,
aiming to develop a learning scheme and work towards solving problems related to learning
phase of Cognitive Radio systems. Interesting scenarios are to be mobilized for the
performance assessment work, conducted in order to design and use an appropriate
structure, while indicative results need to be presented and discussed in order to showcase
the benefits of incorporating such learning schemes into Cognitive Radio systems.
Subsequently feasibility of such learning schemes could be tested with simulations. In the
near future, such learning schemes are expected to assist a Cognitive Radio system to
compare among the whole of available, candidate radio configurations and finally select the
best one to operate in.
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