Performance Evaluation of Spectrum Sensing and Channel Access in Cognitive Radio Networks
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چکیده
Spectrum sensing is an essential functionality of cognitive radio networks. In the existing Cognitive Radio spectrum detection techniques secondary nodes base their channel access decisions solely on the outcome of the spectrum sensor without taking into consideration the possibility that those outcomes are incorrect. To alleviate these negative effects a combined design is proposed for the secondary nodes to have better channel access where the spectrum sensor outcome and reliability measure of spectrum sensor decisions are considered. Simulation for characterizing the detrimental effects of spectrum sensor errors and effectiveness of combined design is done using binary hypothesis condition. Results show considerable increase in secondary access probabilities which eventually increases the throughput and decreases the delay of both primary and secondary networks.
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