Power allocation in OFDM-based cognitive radio networks for fading channel

Cognitive Radio (CR) as an emerging technology has offered a solution for underutilized spectrum problem by allowing spectrum sharing among Primary Users (PUs) and Secondary Users (SUs). To protect every PU, the SUs need to adjust their transmit power, so it will not degrade PU's performance. In this paper, power control algorithm using Iterative Partitioned Water Filling (IPW) are performed for CR network with multiple PUs and SUs under opportunistic spectrum access mode. The simulation is conducted for CR networks with multiple PUs and and SUs under fading channel. From the simulation results, IPW under Rician channel has better performance than Rayleigh channel.