说明：  一种新的OFDM信号盲识别算法，利用多载波OFDM信号在时域上的近高斯性，提取信号特征参数Q作为分类特征
(A new algorithm for the identification of Orthogonal Frequency Division Multiplexing(OFDM)signal is proposed．The feature parameter a is used to discriminate OFDM signal because of their asymptotically Gaussia)