Radio Frequency of Cognitive Radio
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Cognitive radio system (CRS) is a radio system which is aware of its operational and geographical environment, established
policies, and its internal state. It is able to dynamically and autonomously adapt its operational parameters and protocols and to
learn fromits previous experience. Based on software-defined radio (SDR), CRS provides additional flexibility and offers improved
efficiency to overall spectrum use. CRS is a disruptive technology targeting very high spectral efficiency. This paper presents an
overview and challenges of CRS with focus on radio frequency (RF) section.We summarize the status of the related regulation and
standardization activities which are very importa