Dynamic Power Control Strategy for Overlay Multi-Secondary Users in Cognitive Radio Environment

Year 2020, Volume: 4 Issue: 3, 119 - 129, 28.09.2020

Jide Popoola Chinedu Olebu

Abstract

Current scarcity of radio spectrum availability for new wireless services and applications has made dynamic spectrum access a rich research area across the world. However, one of the problems confronting dynamic spectrum access via cognitive radio technology is optimal spectrum resource allocation in a cognitive radio environment (CRE). In proffering solution to this problem, the study presented in this paper applies the inherent capability of iterative water filling (IWF) algorithm to develop resource allocation strategies in an overlay CRE. The developed resource allocation IWF algorithm in this study was designed for multi-secondary users, consisting of two- and three-secondary users, in a CRE with an idle primary user. The developed algorithm was simulated in MATLAB® environment. The performance evaluation results of the developed resource allocation algorithm, using IWF, show that the multi-secondary users converge at different data rates. Also, the results of the performance evaluation test conducted shows that the number of the secondary users is inversely related to data rate convergence potential. Furthermore, the overall result of the study shows that effective and efficient radio spectrum resource allocation or sharing is achievable and affordable

Keywords

Dynamic spectrum access, cognitive radio, access models, dynamic resource allocation, iterative water filling

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