【摘要】 针对认知无线网能量消耗引起的能量效率较低问题,在研究认知无线网分簇协作频谱感知能量效率的基础上,提出了一种最优功率分配算法来最大化次用户系统的能量效率。通过建立基于次用户能量效率最大化传输优化模型,在考虑传输功率、感知时间以及干扰限制的情况下,利用拉格朗日函数及KKT条件,得到最优次用户发射功率分配算法,以达到系统能量效率最大化的目的,同时分析了不同参数对能量效率的影响。仿真结果表明,本文所提算法能有效提高次用户系统的能量效率、减少系统开销。更多还原

【Abstract】 Aiming at the low energy efficiency caused by the energy consumption of cognitive radio network,an optimal power allocation algorithm is proposed to maximize the energy efficiency of secondary user system based on clustering cooperative spectrum sensing. By establishing the energy efficiency maximization transmission model and considering transmission power,perceived time constraints and interference constraints,the optimal transmitted power allocation algorithm can be obtained to achieve the purpose of the system energy efficiency maximization through using Lagrange function and KKT condition.Then the influence of different parameters on energy efficiency is analyzed. Simulation results show that the proposed algorithm can reduce energy consumption and improve energy efficiency.更多还原