連續(xù)相位調制信號的二階循環(huán)平穩(wěn)特性分析
The Characteristic Analysis of Second Order Cyclostationarity of Continuous Phase Modulation Signal
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摘要: 連續(xù)相位調制(CPM)信號以其恒包絡和優(yōu)良的頻譜特性在現(xiàn)代衛(wèi)星通信和移動通信中越來越受到人們的重視，然而這一大類調制信號的循環(huán)平穩(wěn)特性卻較少有人關注。該文根據(jù)連續(xù)相位調制信號在不同調制指數(shù)下的基帶循環(huán)譜，推導了其相應帶通循環(huán)譜的表達式, 并對這些表達式的詳細分析，得出了不同調制指數(shù)情況下循環(huán)頻率與載頻、碼元寬度和峰值頻偏之間的關系式。仿真實驗證明這些結論是正確的。Abstract: Continuous Phase Modulated (CPM) signals play a prominent role in modern satellite communication systems and mobile communication systems due to their constant envelope property and bandwidth efficiencies. However, there was no much comprehensive reference concerning the cyclostationarity of the large family of CPM. In this paper, the general band-pass cyclic spectral representations of the continuous phase modulation are derived and analyzed in detail based on the analytical expression of the corresponding base-band cyclic spectra; as well, the relation between cyclic frequency and carrier frequency, code width, peak frequency deviation is obtained with the different modulation indexes. These conclusions are proved by the computer simulations.
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