The Simulation And Evaluation Of Key Technologies In Mac Layer Of Cognitive Radio

The sharp scarcity of radio spectrum results in the proposed of Cognitive Radio (CR) technology, which can sense the radio environment and find spectrum hole duly and smartly. CR can make its subscriber use the spectrum holes quickly and correctly without interfacing the primary users by changing their transmitter and receiver's parameters such as transmit power, carrier frequency, modulating technology and etc. in real-time. It can increase the spectrum utilization, and, Cognitive radio MAC layer play an important role in cognitive radio system.Researchers have been advancing large numbers of new ideas and new algorithms to cognitive radio, especially in MAC layer. It is indispensable to evaluate these algorithms in a uniform simulation platform.In home and abroad, However, there is a little research and practice in system level simulation platform of cognitive radio. Therefore, this paper focused on the construction of MAC layer platform and the simulation of key technologies in Cognitive radio MAC layer.In this paper, firstly, we learned and summarized some key technologies of CR MAC. Then, the methods of building simulation platform for CR MAC were discussed. We also checked whether the platform we built is correct. Finally, we tested the basic parameters of the platform and evaluated the Adaptive Cooperation Sensing Schedule (ACSS) algorithm. The simulation result show that this MAC layer platform can simulate key technologies of MAC layer correctly and effetely; The ACSS algorithm can effectively shorten the time for finding spectrum hole and therefore, increase the sensing effect by using a unique node allocation algorithm and channel sort.