为了解决多径信道下 DVB- T 系统中 OFDM 信号子载波调制方式识别性能差的问题，文中提出了一种新的子载波调制方式识别方法．该方法首先采用子载波的归一化功率对空子载波信号进行识别，然后利用循环谱截面相关系数识别出导频子载波信号，最后通过混合高阶矩对调制子载波信号进行识别，从而完成了 OFDM 信号子载波调制方式的识别．仿真结果表明，在多径信道下，该方法不但具有良好的识别性能，而且具有较低的计算复杂度．

As the existing subcarrier modulation recognition schemes for OFDM signals is of poor performance overmultipath channels in DVB- T system,a novel recognition scheme is proposed.In this scheme,first,null subcarriersignals are recognized by the normalized power of the subcarriers.Then,pilot subcarrier signals are recognized ac-cording to the correlation coefficient of cyclic spectrum section.Finally,the modulated subcarrier signals are recog-nized with mixed high- order moment to complete the recognition of subcarrier modulation modes for OFDM signals.Simulated results show that the proposed scheme possesses not only good recognition performance but also low com-putation complexity.