认知无线电中联合功率控制的动态频谱分配算法

Dynamic spectrum allocation algorithm of joint power control in cognitive radio networks

针对认知无线电网络动态频谱分配算法开展研究,基于最大独立集理论,提出一种改进的联合功率控制的动态频谱分配算法,通过联合功率控制机制,避免用户之间的相互干扰和对已分配信道链路的干扰,满足多用户应用需求,并减少节点能耗。该算法以最大独立集为分配起点,允许一次同时分配信道给多个互不干扰的链路,同时兼顾资源分配的公平性,能够有效减少分配的总次数和用户间的信息交互量。仿真结果显示改进的动态频谱分配算法在需求满足率和公平性上都优于原有算法。

This paper focus on the dynamic spectrum allocation algorithms in cognitive radio networks,and based on MIS,proposed an improved dynamic spectrum allocation algorithm which took the power control technique into account. Joint power control mechanism could not only avoid interference between users,but also avoid interference to link which was already allocated a channel,this in turn,meeted more users＇transmission requirements and reduced the energy consumption of nodes. In the proposed algorithm,allocation begins with the MIS,that allows to assign a particular channel simultaneously to a set of links with no interference between each other,at the same time the algorithm gives attention to fairness among uses during re-source allocation,so that the algorithm can cut back the number of allocation and reduce communication and information ex-change among users. Simulation results show that command satisfied rate and fairness of the improved dynamic spectrum allo-cation algorithm are better than other those of other algorithms.