A spectrum allocation algorithm to maximize the system access amount in cognitive radio system

The existing spectrum allocation algorithms do not consider the starvation phenomenon of cognitive users seriously in cognitive radio wireless networks. For this reason, a maximum system access algorithm based on graph coloring model is proposed. Aiming at maximizing the system access, it assures the validity by means of designing corresponding schemes of selecting cognitive users and channels. Comparisons are made with coordinated maximal system bandwidth (CMSB) algorithm and minimum graph coloring algorithm. Numerical results show that the proposed algorithm can achieve a good tradeoff between throughput and fairness while ensuring interference-free transmission.