Analysis and Enhancement of Power Control Techniques in Cognitive Radio Networks
Keywords:
wireless, cognitive radio system, dynamic spectrum, power control, accessAbstract
In this paper, we consider the situation where the primary user (PU), i.e., the licensed user, and the secondary user (SU), i.e., the cognitive radio, coexist and share the spectrum simultaneously to enhance spectrum efficiency. The most challenging problem is the interference that occurs if the SUs fail to detect the presence of the PU's signal, i.e., misdetection (MD), and start transmission in the same frequency band with a transmit power larger than a limit, which can be decided based on the noise floor and the interference protection ability of the PUs. The objective of this research work is to analyze the performance of different power control schemes available in the literature and also propose a new transmit power control scheme for cognitive radio systems. In this research, a distance-based, efficient transmit power control scheme for a cognitive radio system (CRS) with multiple antennas has been proposed.
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