In order to solve the problem of effective allocation of spectrum resources and provide an effective spectrum access method for the Internet of Things, a cognitive wireless system based on MCCDMA structure is proposed, and the performance of the system is studied. Two strategies named Underlay and Overlay are proposed and corresponding BER performance are analyzed when the main users are occupying the spectrum. The trend of probability of outage are researched when the number of secondary users are mutative. Theoretical analysis and simulation results show that the cognitive wireless system can use spectrum resources more flexibly and effectively, which is very suitable for application in IoT systems.
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