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An Overview of Cognitive Radio Networks: A Future Wireless Technology
Abstract
The major hurdle that restricts the efficient utilization of radio spectrum is its inflexible and rigid licensing scheme. This constraint limits the emerging wireless systems to operate in static spectrum band. This deficiency compelled the innovators to introduce new paradigm (i.e., cognitive radio [CR] technique to boost productive spectrum utilization). In this chapter, the authors briefly introduce the CR to exploit wireless spectrum opportunistically. Cognitive radio network architecture is also discussed in detail. Authors also mentioned the software-defined radio (SDR) platform as a support to regulate spectrum reuse. IEEE 802.22, the first worldwide standard for wireless regional area network (WRAN), based of CR technology is presented in descriptive way along with its capacity, coverage, MAC layer frame structure. It has been observed that CR strikes its presence in today's modern wireless systems, applications, various projects, and trends, and become their desire.
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