摘要
动态频谱共享技术允许认知用户接入未授权的频谱,可以有效地提高频谱资源的利用率。在分析了频谱共享的2种接入模式的基础上,提出了填充式频谱共享的系统模型。根据认知用户的效用函数,通过注水算法得到了用户间的功率迭代公式,进而求得了认知用户的功率和载波分配结果。仿真表明,该迭代算法在有效完成用户间功率与载波分配的同时能够在较短的时间内收敛。
The dynamic spectrum access technology can achieve near-optimal spectrum utilization by allowing cognitive users to sense and utilize available spectrum opportunistically. Based on analysis on two access modes, this paper proposes a spectrum sharing model for spectrum overlay. According to the cognitive users＇ utility functions, the iterative formulas of cognitive users＇ power are obtained through water-filling algorithm. And then we obtain the power and sub-carrier allocation results. Simulation analysis show that the iterative algorithm can not only effectively assign the power and sub-carriers between cognitive users, but also can converge in limited time.
出处
《无线电通信技术》
2011年第5期44-47,共4页
Radio Communications Technology
关键词
认知无线电
频谱共享
填充式
功率分配
迭代算法
cognitive radio
spectrum sharing
overlay
power allocation
iterative algorithm
