Cognitive Radio: State-of-the-Art and Mathematical Challenges.

Khan, Mohammed Zafar Ali and Nadkar, T and Thumar, V and et al, . (2011) Cognitive Radio: State-of-the-Art and Mathematical Challenges. In: World Scientific Congress, 2011..

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Abstract

In the last few years, a new paradigm has emerged in the field of wireless communication, called Cognitive Radio (CR). CR attempts to alleviate the imbalance created by a fixed spectrum allocation policy and the irregular usage of the frequency bands. Since its inception, as an intelligent and reconfigurable radio, CR has evolved into a multi-disciplinary technology, and has invoked the interest of engineers, economists, scientists and mathematicians alike. A vast amount of literature has stemmed from this revolutionary paradigm, with varied focuses and perspectives. The goal of this paper is two-fold: (i) First, we catalogue the myriad aspects which encompass the CR technology, and on most issues, we highlight the open research problems and challenges faced. Though cursorily, the multiple facets of CR have been addressed, to invoke the interest of readers across disciplines. (ii) An interesting approach to document the plethora of research activities pertaining to CR, is to cast them in the framework of enabling tools, viz. optimization, game theory, fuzzy logic, genetic algorithms and neural networks, and to provide a state-of-the-art of the research contributions therein. An important research area in CR is power allocation; the optimum power allocation problem for an Orthogonal Frequency Division Multiplexing-based CR is investigated, and relevant simulation results are provided to demonstrate the effectiveness of the technique.

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