摘要
在研究通信信号的循环平稳理论的基础上,利用频域平滑的谱相关估计算法,提出一种新的数字调制信号检测方法,降低了一般循环谱检测方法的复杂度,提高了检测性能。该方法对数字调制信号谱相关特性进行分析,计算谱相关函数f截面的归一化面积,确定合适的判决阈值,通过阈值判决来实现基于通信信号循环特征的调制模式检测。仿真结果表明,在低信噪比条件下,检测成功率高达98%。
On the basis of investigating the theory of cyclostationary of communication signals, a new digital modulation detection method is proposed by using frequency domain smooth spectrum correlation estimation algorithm. This method can reduce the complexity of general cyclic spectrum detection method and improve detection performance. This method first analyzes digital modulation signal spectrum characteristics, then calculates normalized spectral correlation function section area, determines appropriate decision threshold. The modulation pattern detection which is based on the communication signal＇ s circulation characteristics is realized through the thresh- old value judgment. Simulation results show that the detection rate can be higher than 98% even under the condition of low SNR,
出处
《无线电通信技术》
2014年第2期27-30,33,共5页
Radio Communications Technology
关键词
循环谱相关理论
f截面特征参数
调制分类识别
识别率
eyclostationary theory
fsection characteristic parameter
modulation recognition
recognition rate
