认知无线电中的功率和频谱联合分配算法

Joint power and spectrum allocation algorithm in cognitive radio networks

在认知用户传输功率受限的情况下,分析了瑞利衰落模型下的认知用户效用及其优化过程,提出了基于注水线不断调整的认知用户功率分配及通信效用计算算法.将该算法应用到认知无线电频谱分配中,进而提出了一种基于信道二分法的认知无线电频谱分配机制,以此得到了不同优化模型下的用户效用.仿真表明,基于比例公平的优化模型在获得较高效用的同时具有较高的公平性.

Under the constraints of transmission power of the cognitive users, the optimization process of cognitive users＇ utility was analyzed with Rayleigh Fading model, and then an algorithm based on water-level continually adjustment was proposed to solve the problem of power allocation and communication utility computation. This algorithm was also applied to spectrum allocation, so that a cognitive radio spectrum allocation mechanism based on channel bisection was proposed too. From this, the users＇ utility under different optimization models could be obtained. Simulation results show that the model based on proportional fairness not only provide fair spectrum allocation, but also has a higher total utility.