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1、摘要本課題來(lái)源于電子科技大學(xué)電子系統(tǒng)工程中心成都賽英科技有限公司項(xiàng)目:GMSK調(diào)制跳頻源。現(xiàn)代通信系統(tǒng)中,不僅僅需要傳輸語(yǔ)音信息,還需傳輸各種數(shù)據(jù)終端產(chǎn)生的大量數(shù)據(jù)信息以及視頻信息。數(shù)據(jù)傳輸中,需要頻譜能量集中,頻帶較窄的調(diào)制方式,以及解決干擾問(wèn)題。這樣,研究利用調(diào)制和跳頻技術(shù)傳輸高速數(shù)據(jù)就成了很有意義的課題。由于高速數(shù)據(jù)占用更寬的帶寬,所以在調(diào)制制式上應(yīng)該尋找一種適合于跳頻通信特點(diǎn)的具有高頻譜效率的調(diào)制方案。本課題將跳頻技術(shù)和GMsK調(diào)制相結(jié)合來(lái)實(shí)現(xiàn)通信速率為192kbit/s。本文首先簡(jiǎn)述了頻率合成器,分析
2、了頻率合成器的工作原理和噪聲性能,介紹了常用調(diào)制技術(shù),重點(diǎn)分析了本課題中運(yùn)用兩點(diǎn)調(diào)制實(shí)現(xiàn)GMsK調(diào)制,并對(duì)GMsK調(diào)制進(jìn)行了仿真,根據(jù)實(shí)測(cè)頻譜和仿真的對(duì)照,保證了方案的正確和系統(tǒng)功能實(shí)現(xiàn)。本文詳細(xì)地?cái)⑹隽讼到y(tǒng)的設(shè)計(jì)過(guò)程,系統(tǒng)指標(biāo)的驗(yàn)證過(guò)程,以及在實(shí)際實(shí)現(xiàn)過(guò)程中容易出現(xiàn)的問(wèn)題,如何避免和解決這些問(wèn)題。同時(shí)也給出了對(duì)每一個(gè)功能模塊的詳細(xì)分析過(guò)程,實(shí)現(xiàn)過(guò)程和最后給出了最終測(cè)試數(shù)據(jù)圖,以及最終結(jié)果分析。關(guān)鍵詞:鎖相環(huán),頻率合成器,GMSK調(diào)制,兩點(diǎn)調(diào)制ABSTRA(叮ABSTRACTThesubjectstemsfro
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