The Spectrum Distribution Algorithm on the Cognitive Radio System

Abstract

In order to reduce complexity for gaining spectrum from the spectrum sharing pool, The thesis researches the idea of combination with using the graph theory and game theory, first spectrum allocation uses graph theory, and then second distribution uses game theory based on water-filling, to a certain extent, graph theory algorithm is intuitive, it easy to understand, in cognitive radio network graph theory model complete firstly the spectrum distribution, then between cognitive users game by using waterfilling algorithm and optimize the channel to complete the redistribution of channels. Finally, simulation results show that the spectrum resources can be fully utilized, under transmission power constraining, each cognitive user optimizes their throughput, allocates reasonable power, the simulation can verify that the algorithm of combination with graph theory and game theory has convergence and effectiveness.