基于USRP2920与差分能量检测的双门限频谱感知算法实现  

Implementation of Double-Threshold Spectrum Sensing based on USRP2920 and Differential Energy Detection

作　　者：崔翠梅[1,2] 秦贵秋 吴秋怡 CUI Cuimei;QIN Guiqiu;WU Qiuyi(Changzhou Institute of Technology,Changzhou Jiangsu 213032,China;Southeast University,Nanjing Jiangsu 211189,China)

机构地区：[1]常州工学院,江苏常州213032 [2]东南大学,江苏南京211189

出　　处：《通信技术》2022年第1期14-20,共7页Communications Technology

基　　金：国家自然科学基金(61801056);中国博士后科学基金(2018M632203);江苏省教育厅未来网络研究基金项目(FNSRFP-2021-YB-37);常州市重点研发计划(社会发展科技支撑)项目(CE20215055)。

摘　　要：为提高紧缺频谱资源的利用率,针对实际无线通信环境噪声不确定性对感知性能的影响,搭建了基于软件无线电外设(USRP,NI2920)的认知无线通信系统平台,利用差分双门限能量检测算法感知授权用户信号并估计空闲可用频带,为认知用户的动态频谱接入提供判别依据。此外,推导出差分双门限能量检测概率的闭合表达式,并通过实验估计噪声功率,分析验证了判决系数与噪声波动系数对检测性能的影响。实验结果表明该方法可根据实际噪声波动情况灵活调整检测门限,且与传统的能量检测算法相比,低信噪比环境下感知性能更优。To improve the utilization of scarce spectrum resource, with the problem of noise uncertainty in the real communication scenario, a cognitive radio system consisting of USRP(Universal Software Radio Peripheral) NI-2920 is proposed to detect licensed bands and estimate the free available bands, and improve sensing performance by combining differential energy detection and double-threshold spectrum sensing method. Besides, the closed functions of detection probabilities are deduced, and the noise power is calculated, and the impact of the decision coefficient and the noise fluctuation coefficient on detected performance are also analyzed by experiment. Experimental results indicate that the method proposed can adaptively adjust the thresholds values according to noise volatility and has better the performance for detection capability, compared with conventional energy detection method.

关 键 词：认知无线电 双门限频谱感知 差分能量检测 通用软件无线电外设 噪声不确定性 

分 类 号：TN925[电子电信—通信与信息系统]