A new spectrum allocation algorithm for IMT-Advanced system over rayleigh-fading channels

Due to spectrum scarcity and emerging various wireless applications in IMT-Advanced system, spectrum allocation scheme becomes a recently critical issue. In this paper, we refer to the concepts of spectrum reservation and power reward, make use of maximum-minimum criteria, propose a cellbased distributed dynamic spectrum allocation (DSA) algorithm which combines the water filling power allocation algorithm with the DSA algorithm. In this paper, the joint algorithm is used to tackle the cellular network topology for the dynamic spectrum allocation scheme in IMT-Advanced system. It aims to efficiently satisfy users´ diverse quality-of-service (QoS) requirements of multimedia traffic. Our proposed algorithm is an adaptive algorithm providing good performance and adaptability in both spectrum varying environment and multiservice environment in IMT-Advanced system. Compared with conventional algorithm, this novel algorithm considers system stability, fairness among users and improves the spectrum efficiency. The simulation results show that our algorithm has higher system stability under the condition of acceptable complexity than previous methods.