认知无线电网络中多目标频谱分配与功率控制

Spectrum allocation and power control with multi-objective optimization in cognitive radio networks

针对Underlay接入方式的认知无线电网络中的功率控制问题进行了研究,提出同时考虑频谱分配和功率控制两个因素。为了同时满足用户的多种需求,将网络容量和功耗效率构建成一个多目标优化问题,然后提出了一种基于NSGA-Ⅱ的改进多目标优化算法对该问题进行建模求解,得到了适合用户不同需求的Pareto最优解集。最后将所提方法与SPEA-Ⅱ算法进行了实验对比,仿真结果表明,所提方法能够有效地搜索到优化解,并且能够满足不同情况下的频谱和功率分配要求。

This paper studied the problem of power control in cognitive radio networks based on Underlay access method,and considered two factors of spectrum allocation and power control simultaneously.In order to meet the multiple needs of network users at the same time,this paper addressed the spectrum allocation and power control with respect to optimizing both power consumption efficiency and network capacity in cognitive radio networks.Then it proposed an improved multi- objective optimization algorithm based on NSGA-Ⅱ to solve the problem,and obtained the optimal set of Pareto solutions suitable for different users.Finally ,compared with the SPEA-Ⅱ algorithm,and the simulation results validate that the proposed strategy can harvest the optimal solutions efficiently and satisfy the requirements of spectrum allocation and power control in various cases.