一种快速OFDM调制信号识别算法  

Fast OFDM modulated signal recognition algorithm

作　　者：朱颜锐[1] 田斌[1] 安金坤[1] 孙永军[1] 易克初[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2012年第1期17-22,共6页Journal of Xidian University

基　　金：国家部委预研基金资助项目(9140C13050108);国家自然科学基金资助项目(60702060);高等学校学科创新引智计划资助项目(B08038)

摘　　要：利用固有时间尺度分解对接收信号提取瞬时参数,结合方向数据的统计分析方法,提取了3个特征参数作为联合特征向量组,对正交频分复用(OFDM)信号和常见单载波调制信号进行类间识别,并对载波频率、符号速率和采样率等系统参数对识别性能的影响进行了分析.该算法可直接在中频对信号进行处理,避免了载波恢复过程.仿真结果表明,该算法可以在信噪比较低的条件下很好地区分OFDM信号和单载波,并对系统参数表现出了一定的鲁棒性.The intrinsic time-scale decomposition（ITD） method is a novel algorithm for time-frequency analysis,which can express the dynamic information of non-stationary signals with precise instantaneous parameters.An OFDM modulation recognition algorithm is proposed based on the ITD and the circular data analysis methods.The algorithm extracts three parameters as a co-feature vector to distinguish the OFDM from single carrier modulations.The impact of the carrier frequency,symbol rate and sampling rate on the recognition performance is also considered.The intermediate frequency signal can be processed directly,avoiding the carrier recovery process.Simulation results show that the algorithm can distinguish the OFDM from single carriers successfully even under a low SNR,and that it is also robust to system parameters.

关 键 词：正交频分复用识别 固有时间尺度分解(ITD) 瞬时相位 三角矩 

分 类 号：TN92[电子电信—通信与信息系统]