认知无线电系统基于动态功率控制的频谱分配

为研究认知无线电系统中下垫式共享方式下的资源分配问题，提出一种基于动态功率调整的子载波分配算法. 该算法根据授权用户的状态对认知用户在子载波上的功率进行动态调整，当授权用户接入时将认知用户的功率限制在干扰功率限之下，当授权用户离开时将认知用户的功率设置为最大发送功率；根据授权用户和认知用户的业务流分布以及认知用户在不同子载波上的信道增益进行子载波的动态分配. 仿真结果表明，与现有算法相比，基于动态功率调整的资源分配算法能够获得明显的吞吐量性能增益. 

Frequency Allocation Based on Dynamic Power Controlling Adjustment in Cognitive Radio System

Researched the resource allocation under the underlay mode in cognitive radio system and proposed a subcarrier allocation algorithm based on dynamic power adjustment. The algorithm firstly adjusted the power of cognitive user in subcarrier dynamically according to the licensed user state in such style as: when the licensed user accessed the subcarrier, the power of cognitive user was limited under the interference power limitation, and when the licensed user left, the power of cognitive user was promoted to the maximal transmitted power in the subcarrier. Then the algorithm allocated subcarriers dynamically according to the service flow distributions of licensed users and cognitive users and the different channel gains of cognitive users in different subcarriers. The simulation shows that, in comparison to the current research, the proposed algorithm can achieve obvious gain in throughput performance.