A CROSSLAYER PROTOCOL DESIGN APPROACH BETWEEN PHY AND MAC LAYER FOR COGNITIVE RADIO NETWORKS

To design OFDM based Cross layer design for cognitive machine to machine communication for IoT. The Spectrum sensing is done in the Physical layer and Scheduling and Power allocation to the subcarrier is done in the MAC layer is provided to develop a standardized protocol stack for internet of things. OFDM is a multi - carrier transmission technique that divides the available spectrum into subcarriers. OFD M has the ability for combating inter symbol interference in frequency selective channels and for avoiding interference among scheduled users by assigning different subcarriers to different users. Each time - slot the scheduling is done selecting a subset of users for transmission, determining the assignment of available subcarriers to selected users. Spectrum sensing is done in the physical layer based on energy detection technique. Scheduling in the MAC layer using Round Robin scheduling method. Power alloc ation to the Subcarriers is done using the Greedy Power Allocation Algorithm. To analyze the performance using MATLAB