連續(xù)相位調(diào)制信號(hào)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(diào)制(CPM)信號(hào)以其恒包絡(luò)和優(yōu)良的頻譜特性在現(xiàn)代衛(wèi)星通信和移動(dòng)通信中越來(lái)越受到人們的重視，然而這一大類(lèi)調(diào)制信號(hào)的循環(huán)平穩(wěn)特性卻較少有人關(guān)注。該文根據(jù)連續(xù)相位調(diào)制信號(hào)在不同調(diào)制指數(shù)下的基帶循環(huán)譜，推導(dǎo)了其相應(yīng)帶通循環(huán)譜的表達(dá)式, 并對(duì)這些表達(dá)式的詳細(xì)分析，得出了不同調(diào)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(guān)系式。仿真實(shí)驗(yàn)證明這些結(jié)論是正確的。
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關(guān)鍵詞:
- 連續(xù)相位調(diào)制;循環(huán)平穩(wěn);循環(huán)譜
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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