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A Fuzzy Logic–Driven Decision Model for Improving Reliability of Spectrum Access in Cognitive Radio Networks

Mathew Timothy Oluwafemi , Adamu Dahiru

Abstract

The significant growth and expansion of wireless communication services has led to an increase demand of efficient spectrum utilization, thereby exposing the inherent limitations of traditional spectrum allocation policies. In response to these challenges, Cognitive Radio Networks have emerged as a promising paradigm, facilitating dynamic spectrum access and improving overall spectrum efficiency. However, ensuring reliable spectrum decision-making remains a major challenge due to uncertainty in radio environments and imperfect sensing mechanisms. This study proposes a fuzzy logic–based decision model aimed at enhancing the reliability of spectrum access in Cognitive Radio Networks . The model employs a fuzzy inference system to effectively handle uncertainties associated with key input parameters, including received signal strength, noise level, and channel availability, thereby enabling more accurate and adaptive spectrum access decisions. The system performance is evaluated using key metrics: Probability of Detection (Pd), Probability of False Alarm (Pf), Spectrum Utilization Efficiency, and Throughput. Results from simulation analysis demonstrate that the model achieves high detection accuracy (high Pd) with reduced false alarms (low Pf), thereby minimizing interference to primary users while maximizing spectrum opportunities for secondary users. Furthermore, the model improves spectrum utilization efficiency and ensures stable throughput under varying network conditions. The findings indicate that the proposed fuzzy logic–based approach provides an adaptive and robust model for optimizing spectrum utilization in cognitive radio networks, making it suitable for future generation of wireless communication systems. Index Terms: Cognitive Radio Networks, Fuzzy Logic, Spectrum Sensing, Spectrum Utilization, Throughput, Dynamic Spectrum Access.

References

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