基于谱分析的OFDM调制识别新方法

New Modulation Recognition Methods for OFDM Based on Spectral Analysis

针对正交频分复用(OFDM)信号与单载波信号调制识别,提出了3个基于功率谱特征的识别参数。根据OFDM信号功率谱边沿陡峭的特性,通过对归一化功率谱进行分析、统计和曲线拟合,提取3个参数,实现加性高斯白噪声信道(AWGN)条件下OFDM信号与9种单载波信号的识别仿真。该文识别参数具有特征参数易于提取、识别准确率高的优点。

To discriminate orthogonal frequency division multiplexing（OFDM）from single carrier signals,this paper proposes three new feature parameters based on spectral analysis.Since the edge of power spectrum of the OFDM is sharp,by statistical analysis and curve fitting the normalized power spectral,three new feature parameters are extracted,and the recognition simulation of OFDM and 9kinds of single carrier signals under the additive white Gaussian noise（AWGN）is carried out.The method has lots of advantages,such as the feature parameters could be extracted easily and recognition accuracy rates are also very high.