DVB-T系统中OFDM信号子载波调制方式的识别  

Recognition of Subcarriers Modulation Schemes for OFDM Signals in DVB-T System

作　　者：李兵兵[1] 杨吉[1] 刘明骞[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《华南理工大学学报（自然科学版）》2014年第3期21-26,共6页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61271299);国家"863"计划项目(2007AA01Z288);高等学校学科创新引智计划资助项目(B08038)

摘　　要：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 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 according to the correlation coefficient of cyclic spectrum section. Finally,the modulated subcarrier signals are recognized 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 computation complexity.

关 键 词：调制识别 正交频分复用 归一化功率 循环谱 相关系数 混合高阶矩 

分 类 号：TN911.7[电子电信—通信与信息系统]