SNR-Based Adaptive Spectrum Sensing for Cognitive Radio Networks
Cognitive radios are indispensable to shift paradigm from conventional exclusive spectrum assignment to dynamic spectrum access. They can boost up spectrum utilization significantly, by dynamically accessing unused primary spectrum while bringing no harm to primary users. The envisioned radio calls for fast and accurate spectrum sensing. Researchers are focusing on cooperative spectrum sensing to improve reliability but still there is room for improvement in local spectrum sensing. In cooperative spectrum sensing, it will be hard to cooperate with local network nodes in a short time as cognitive radio has to operate in heterogeneous wireless networks. Most of the renowned local spectrum sensing technique in the literature up to now is cyclostationary feature detection, although it is reliable but computationally complex.