基于高阶累积量的OFDM信号子载波的调制识别  

Modulation Identification for Subcarriers of OFDM Signals Based on Higher Order Cumulants

作　　者：魏瑾[1] 

机构地区：[1]山西机电职业技术学院,山西长治046011

出　　处：《安徽电子信息职业技术学院学报》2017年第4期10-13,共4页Journal of Anhui Vocational College of Electronics & Information Technology

摘　　要：提出一种在多径信道下的OFDM信号的子载波调制方式识别算法,利用两个高阶累积量特征先后识别出OFDM信号中空子载波信号和导频子载波信号,再通过一个特征矢量对OFDM子载波的调制方式进行识别,从而完成OFDM信号子载波调制方式的识别。该方法不但可消除多径效应带来的影响,而且减小了噪声对识别性能的影响。通过仿真可以看出,在信噪比为10d B时,正确识别率可达95%以上。This paper proposes a modulation identification algorithm for subcarriers of the OFDM signals under multipath channel.The method firstly identifies null subcarrier signals of the OFDM and the pure pilot subcarrier signals by two cumulant characteristic,and then identifies the subcarriers of the OFDM signals through a feature vector,finally completes the subcarriers modulation mode identification of OFDM signal.This method not only can eliminate the effects of multipath effect,but also reduce the noise effect on the performance of recognition.The simulation results show that the correct recognition rate can reach more than 95% when the signal-to-noise ratio is 10 dB.

关 键 词：正交频分复用 高阶累积量 调制识别 子载波 

分 类 号：TN914.5[电子电信—通信与信息系统]