A Performance Modeling and Analysis of Cognitive Radio Networks
Suchada Chaisook, Mehmet Mustafa · Spectrum Research Repository (Concordia University) · 2011
A Performance Modeling and Analysis of Cognitive Radio NetworksRapid growth of wireless networks has increased the demand for radio spectrum, which is a finite resource.However, the studies have shown that the licensed spectrum is not utilized most of the time.Cognitive radio is a technology that promises to bring a solution to this inefficient spectrum utilization.In cognitive radio literature, networks typically consist of two types of wireless users: primary and secondary users.While primary users have higher priority in accessing a band of spectrum, secondary users equipped with cognitive radios exploit the same band of spectrum given that their transmissions do not harm the primary users' transmissions.In this thesis, we develop performance modeling and analysis of cognitive radio networks in three different models.The first network model involves cooperation of secondary user in relaying primary user's packets.We show that the cooperation can benefit both primary and secondary users' transmissions.Secondly, we consider cognitive radio networks with multiple primary users.By having multiple primary users, the spectrum occupancy observed by the secondary transmitter and receiver may not be identical and that affects the secondary user performance.Finally, we consider cognitive radio networks with multi-antenna that enables interference cancellation and allows secondary user to transmit continuously without harmful interference to the primary user.To the best of our knowledge the above models have not been analyzed in the literature.