摘要
Femtocell是为了适应3G发展而推出的超小型移动基站系统,通过认知无线电频谱感知技术与运营商的其它基站共享频谱资源。然而,由于3G系统采用了功率控制技术,使得传统的能量检测频谱感知性能受到影响。针对以上问题,根据Femtocell系统的特点,提出应用能量检测频谱感知和时间提前量检测频谱感知相融合的协作频谱感知方法,将能量检测感知和时间提前量检测感知的结果"相与",以确定系统最终的频谱感知结果。分析和仿真结果表明,在相同的频谱感知精度条件下,该方法能缩小Femtocell系统的虚警范围,从而提高频谱资源的利用效率。
Femtocell is a sort of miniature mobile base station system in order to adapt to the development of 3G mobile communication system. It shares the spectrum resources with the operators＇ other mobile base stations by cognitive radio spectrum sensing. As the power controlling technology is applied to 3G systems, the sensing per- formance of traditional energy detection is affected. In order to solve the problem, a cooperative spectrum sensing is proposed according to the characteristic of Femtocell system. It fuses energy detection spectrum sensing and timing advance detection spectrum sensing. The analysis and simulation results show that this method can narrow the false alarm range of Femtocell system under the same sensing accuracy. Thus, the utilization of spectrum resources can be improved.
出处
《科学技术与工程》
北大核心
2014年第21期108-112,共5页
Science Technology and Engineering
基金
国家自然科学基金资助项目(61272038)
河南省教育厅科学技术研究重点资助项目(14B510021)
郑州轻工业学院博士基金(BSJJ2011016)资助
