Available Online at www.ijcsmc.com International Journal of Computer Science and Mobile Computing A Monthly Journal of Computer Science and Information Technology ISSN 2320–088X IJCSMC, Vol. 2, Issue. 2, February 2013, pg.6 – 11 RESEARCH ARTICLE © 2013, IJCSMC All Rights Reserved 6 A New Fuzzy Logic Rule Based Power Management Technique for Cognitive Radio Partha Pratim Bhattacharya 1 , Subhajit Chatterjee 2 1 Department of Electronics and Communication Engineering, Faculty of Engineering and Technology, Mody Institute of Technology & Science (Deemed University), Rajasthan - 332311, India hereispartha@gmail.com 2 Department of Electronics and Communication Engineering, Regent Education & Research Foundation, Barrackpore, West Bengal chsubhajitch@gmail.com Abstract— The limited available spectrum and the ineffi ffi fficient use of spectrum necessitate a new communication paradigm to exploit the existing wireless spectrum opportunistically. Cognitive radio is a wireless communication system in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with licensed or unlicensed users. In our work, a fuzzy logic rule based control system is proposed where the cognitive radio can change its transmission power depending on distance between transmitter and receiver, node density and interference. The proposed system is simulated and found to give satisfactory results. Indexed Terms: - Cognitive radio, fuzzy logic, dynamic spectrum access. I. INTRODUCTION Cognitive radio is a kind of wireless communication system in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with licensed or unlicensed users. It was thought of as an ideal goal towards which a software-defined radio platform should evolve to a fully reconfigurable wireless black-box that automatically changes its communication variables in response to network and user demand. It is considered to be an intelligent wireless communication system that is aware of its surrounding environment (i.e., outside world), and uses the methodology of understanding-by- building to learn from the environment and adapt its internal states to statistical variations in the incoming RF stimuli by making corresponding changes in certain operating parameters (e.g., transmit-power, carrier frequency, and modulation strategy) in real-time, with two primary objectives in mind: · Highly reliable communications whenever and wherever needed; · Efficient utilization of the radio spectrum. The idea of cognitive radio was first presented officially in an article by Joseph Mitola III and Gerald Q. Maguire, Jr in 1999 [1]. It was a novel approach in wireless communications that Mitola later described as: The point in which wireless personal digital assistants (PDAs) and the related networks are sufficiently computationally intelligent about radio resources and related computer-to-computer communications to detect user communications needs as a function of use context, and to provide radio resources and wireless services most appropriate to those needs [2].