摘要
研究OFDM信道系统下的MPSK调制方式,对其二阶累量和四阶累量进行推导和分析,给出一种针对MPSK调制阶数进行识别的新特征构造方法,新特征提取方法简单,而且容易实现,能够有效实现调制识别目的.笔者分别对OFDM系统传输系统性能和识别率进行了计算机仿真,把基于高阶累量的调制识别算法的识别率与基于谱线特征算法的调制算法识别率做了仿真对比.仿真结果表明,在相同信噪比的情况下,基于高阶累量的调制识别算法要远远优于基于谱线特征的算法,当信噪比高于3 dB时,识别率可以达到100%.
This paper studies the modulation of MPSK based on OFDM channel system, by deduction and a- nalysis of the second-order cumulants and the fourth-order cumulants of MPSK signal An innovative feature to distinguish the modulation order of the MPSK is presented. This feature, due to its simple extracted approach and easy realization, can efficiently achieve the goal of modulation classification. The paper gives transmission bit error rate and the modulation recognition rate of OFDM system, and gives a comparison simulation of the MPSK recognition rate between the modulation algorithm based on high-order cumulants and spectrum line fea- ture. The result shows that the advantage of high-order cumulants analysis.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2013年第2期60-63,共4页
Journal of Zhengzhou University（Engineering Science）
基金
河南省基础与前沿技术研究计划资助项目(102300410003)
