FSKBPSK复合调制信号识别与参数估计.pdf

第35 卷第12 期 电 子 与 信 息 学 报 Vol.35No.12 2013 年12 月 Journal of Electronics Information Technology Dec. 2013 FSK/BPSK 复合调制信号识别与参数估计 宋 军*①② 刘 渝① 王旭东① ①(南京航空航天大学电子信息工程学院 南京 210016) ②(南京林业大学信息科学技术学院 南京 210037) 摘 要：该文提出了一种有效的频率键控-二相编码(FSK/BPSK)复合调制信号的识别和参数估计算法。首先给出 FSK/BPSK 复合调制信号的模型，并分析了其相位特征。然后采用二叉树方法，基于相位展开和瞬时频率特征实 现FSK/BPSK 复合调制信号，BPSK 信号和FSK 信号的识别，并详细讨论了基于Neyman-Pearson 准则的识别 门限选定原则。最后采用Haar 小波法和正弦波频率估计算法实现FSK/BPSK 复合调制信号的参数估计。仿真结 果表明，该算法在较低信噪比下仍具有较好的识别性能和参数估计精度。 关键词：信号识别；参数估计；频率键控-二相编码复合调制；瞬时频率 中图分类号： TN974 文献标识码： A 文章编号：1009-5896(2013)12-2868-06 DOI: 10.3724/SP.J.1146.2013.00535 The Recognition and Parameter Estimation of Hybrid Modulation Signal Combined with FSK and BPSK ①② ① ① Song Jun Liu Yu Wang Xu-dong ① (College of Electronic and Engineering, Nanjing University of Aeronaut Astronaut, Nanjing 210016, China) ② (College of Information Science Technology, Nanjing Forestry University, Nanjing 210037, China) Abstract: A recognition and parameter estimation algorithm for hybrid modulation signal combined with Frequency Shift Keying and Binary Phase Shift Keying (FSK/BPSK) is proposed. First, the models of the considered signals and their unwrapped phase are presented. Then, a recognition algorithm is presented for signals including FSK/BPSK hybrid modulation signal, BPSK signal and FSK signal based on instantaneous frequency by utilizing binary tree, and the thresholds of recognition based on N