基于信號功率譜特征的CPM信號多參數估計算法

解輝 姚智剛 呂萌 史林 尹園威

摘? 要： 連續相位調制（CPM）信號由于其良好的頻譜特性被廣泛應用于衛星通信和移動通信中。在非合作信號處理中，為實現對截獲CPM信號的精確干擾或盲解調，需要對其信號參數進行精確估計。提出基于功率譜特征的CPM信號參數估計方法。首先詳細推導了CPM信號[N]次方變換后的功率譜特征，并根據功率譜的峰值響應計算對應的[N]值，最后利用[N]值對信號載頻、碼速率和調制指數分別進行估計。仿真實驗表明，所提算法能夠有效對CPM信號的相關參數進行估計，可以滿足實際系統對CPM信號精確干擾和盲解調的需要。

關鍵詞： 參數估計; CPM信號; 功率譜特征推導; 調制指數估計; 性能分析; 仿真實驗

中圖分類號： TN911.22?34? ? ? ? ? ? ? ? ? ? ? ?文獻標識碼： A? ? ? ? ? ? ? ? ? ? ? ? ?文章編號： 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