基于信号功率谱特征的CPM信号多参数估计算法

解辉 姚智刚 吕萌 史林 尹园威

摘  要： 連续相位调制（CPM）信号由于其良好的频谱特性被广泛应用于卫星通信和移动通信中。在非合作信号处理中，为实现对截获CPM信号的精确干扰或盲解调，需要对其信号参数进行精确估计。提出基于功率谱特征的CPM信号参数估计方法。首先详细推导了CPM信号[N]次方变换后的功率谱特征，并根据功率谱的峰值响应计算对应的[N]值，最后利用[N]值对信号载频、码速率和调制指数分别进行估计。仿真实验表明，所提算法能够有效对CPM信号的相关参数进行估计，可以满足实际系统对CPM信号精确干扰和盲解调的需要。

关键词： 参数估计; CPM信号; 功率谱特征推导; 调制指数估计; 性能分析; 仿真实验

中图分类号： TN911.22?34                       文献标识码： A                         文章编号： 1004?373X（2020）03?0031?05

CPM signal multi?parameter estimation algorithm based on

signal power spectrum characteristic

XIE Hui， YAO Zhigang， L? Meng， SHI Lin， YIN Yuanwei

（Department of Electronic and Optics Engineering， Shijiazhuang Campus of the Army Engineering University of PLA， Shijiazhuang 050003， China）

Abstract： Continuous phase modulation （CPM） signal is widely used in satellite and mobile communications due to its good spectral characteristics. In the non?cooperative signal processing， it is necessary to accurately estimate the signal parameters to realize accurate interference or blind demodulation to the intercepted CPM signal. In view of the above， a CPM signal parameter estimation algorithm based on power spectrum characteristics is proposed. Firstly， the transformed power spectrum characteristics of [N]?th power of CPM signal are derived in detail， and then the corresponding value of [N] is calculated according to the peak response of the power spectrum. Finally， the value of [N] is used to estimate the carrier frequency， code rate and modulation index of the signal respectively. The simulation results show that the proposed algorithm can estimate the correlative parameters of CPM signal effectively， and can satisfy the requirement of accurate interference and blind demodulation to the CPM signal in actual systems.

Keywords： parameter estimation; CPM signal; power spectrum characteristic derivation; modulation index estimation; performance analysis; simulation experiment