【摘要】 次用户在竞争主用户授权频谱资源时会存在远近不公平性问题,该问题可以通过控制次用户的发射功率来解决。基于衬底模式,提出一种改进的功率控制算法。改进后的效率函数能够兼顾次用户的公平性,有效降低算法的时间复杂度。综合考虑信道质量、信干噪比和发射功率,设计更合理的代价函数。在博弈论的基础上,验证所设计效益函数的收敛性,实验结果表明,该算法与传统算法相比,降低次用户发射功率的同时提高了系统的吞吐量,增加了次用户间的公平性和整个系统的效益。更多还原

【Abstract】 There is a problem of near-far unfairness between secondary users when competing for spectrum resources authorized by primary users.The problem was solved by controlling the transmit power of secondary users.An improved power control algorithm was proposed based on underlay mode.The improved efficiency function could balance the fairness between secondary users,and the time complexity of the algorithm was reduced effectively.To design a more reasonable cost function,a comprehensive consideration was needed on channel quality,signal-to-noise ratio and transmit power.The convergence of the designed utility function was verified using iterative algorithm based on underlay mode.Experimental results show that the proposed algorithm can reduce the transmit power of the secondary users and improve the throughput of the system compared with the traditional algorithm,the fairness among the secondary users and the efficiency of the whole system are improved at the same time.更多还原