الفهرس 
Motivations for Cognitive Radio
SPECTRUM SENSING FOR COGNITIVE RADIOOnly 14 pages are availabe for public view
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Abstract
The aim of this study is to focus on spectrum sensing in cognitive radio which is a hot research area recently introduced in order to improve spectrum utilization efficiency. The electromagnetic radio spectrum is a precious natural resource of limited physical extent. However, with wireless devices and applications are increasing daily, the demand for additional bandwidth is rapidly increasing. Static frequency spectrum allocation strategy does not meet the needs for current wireless technology that is why dynamic spectrum usage is required for wireless networks. Cognitive radio has emerged as a solution to dynamic spectrum access, due to its adaptability and reconfigurability. Cognitive radio (CR) can sense the spectrum and detect the idle frequency bands ”spectrum holes”, thus secondary unlicensed users (SUs) adjust their transmission parameters to access those bands. In order to protect primary users (PUs) from harmful interference, an accurate, robust, and rapid reaction spectrum sensor is urgently required at each CR node.