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In this paper, the authors present a slotted ALOHA based multi-channel cognitive radio network opportunistically using the unused spectrum of incumbent devices and analyze its throughput and delay. Furthermore, they analyze packet capture effects of the proposed system model over Rayleigh fading. Cognitive Radios (CR; also often called spectrum agile software defined radios) have been proposed as an efficient means to promote the spectrum utilization by exploiting the temporal or spatial spectrum holes unused by licensed user (Primary User (PU)) devices. The central idea of cognitive user (Secondary User (SU)) devices is to periodically monitor the radio spectrum, intelligently detect occupancy of the channel spectrum and then opportunistically communicate over the spectrum holes with minimum interference to the active PU devices.
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