摘要
频谱感知是实现认知无线电的关键技术之一,协作能一定程度上消除多径和阴影影响,为了提高频谱检测性能,提出一种基于阈值选择信噪比的协作频谱检测的方法,该方法利用空间位置信息估计出信噪比,将检测数据和估计的信噪比送往融合中心,利用阈值设置,对信噪比进行算法选择,选出具有较好的SNR感知用户数据,结合能量检测法进行判断。仿真结果表明:在信噪比分布不均匀的情况下,该方法能较好的提高系统的检测性能,减少融合的用户数目。
Spectrum sensing is a key technology for achieving cognitive radio,while cooperation could eliminate the multi-path and shadow effect.Here,a method for cooperative spectrum sensing based on threshold control and SNR selection is proposed,in which the location information is employed to estimate the SNR,each CR user transmits the local detection result and estimates SNR for the fusion center,the threshold is used to do algorithm selection for SNR,and the CR user with better SNR is selected,and combined with energy detection method for judgement.Computer simulation results show that this method could increases the probability of detection and reduces the node number in decision fusion.
出处
《通信技术》
2011年第3期4-6,共3页
Communications Technology
关键词
协作感知
阈值控制
空间位置信息
SNR选择
cooperative sensing
threshold control
location information
SNR selection
