CAJ | 학술논문

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。
위료해결다경신도하DVB-T계통중OFDM신호자재파조제방식식별성능차적문제，문중제출료일충신적자재파조제방식식별방법。해방법수선채용자재파적귀일화공솔대공자재파신호진행식별，연후이용순배보절면상관계수식별출도빈자재파신호，최후통과혼합고계구대조제자재파신호진행식별，종이완성료OFDM신호자재파조제방식적식별。방진결과표명，재다경신도하，해방법불단구유량호적식별성능，이차구유교저적계산복잡도。
As the existing subcarrier modulation recognition schemes for OFDM signals is of poor performance over multipath channels in DVB-T system,a novel recognition scheme is proposed. In this scheme,first,null subcarrier signals 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.