本文選題：光載射頻　切入點(diǎn)：光載毫米波信號　出處：《中南民族大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：光載射頻通信（Radio-over-Fiber，ROF）充分結(jié)合光纖通信和射頻通信，使用光纖鏈路作為射頻信號的傳輸介質(zhì)，充分利用光纖通信容量大、損耗低、能有效抵抗電磁干擾等特性和射頻通信的靈活高效等優(yōu)勢，能有效解決未來寬帶無線通信中帶寬、容量和傳輸距離的需求。光載毫米波信號產(chǎn)生方法是實現(xiàn)ROF通信的關(guān)鍵技術(shù)之一。本論文以光載毫米波信號的產(chǎn)生方法和傳輸特性為主線展開研究，主要包括兩個方面的工作：一是分析總結(jié)現(xiàn)有光載毫米波信號產(chǎn)生方法，二是提出改進(jìn)型光載毫米波信號產(chǎn)生方法。 第一方面包括：1）介紹了直接調(diào)制、外部調(diào)制、光學(xué)外差調(diào)制等方法，理論推導(dǎo)了外部調(diào)制產(chǎn)生光載毫米波信號的頻譜結(jié)構(gòu)；2）闡述了如何調(diào)整調(diào)制器偏置和本振信號產(chǎn)生雙邊帶(DSB)、單邊帶(SSB)和光載波抑制(OCS)雙邊帶三種制式的光載毫米波信號，并在Optisystem7.0軟件中對這三種光載毫米波信號的傳輸特性進(jìn)行了分析評估，結(jié)果表明在光纖中傳輸時，DSB制式的光載毫米波信號存在功率起伏衰落效應(yīng)，SSB和OCS制式的光載毫米波信號存在碼元縮窄效應(yīng)。 第二方面針對外部調(diào)制技術(shù)提出改進(jìn)方案。改進(jìn)思路是：先用本振信號調(diào)制連續(xù)光激光器出射的光波，，產(chǎn)生SSB或者OCS制式的光載毫米波信號,然后將基帶信號加載到光載毫米波信號的一個頻率成分上。這種光載毫米波信號可以消除功率起伏衰落效應(yīng)和碼元縮窄效應(yīng)。論文詳細(xì)闡述了兩種改進(jìn)的外部調(diào)制方案——改進(jìn)的SSB制式光載毫米波信號的產(chǎn)生和改進(jìn)的OCS制式光載毫米波信號的產(chǎn)生，對兩種方案進(jìn)行了理論分析和模擬仿真。結(jié)果表明，與改進(jìn)之前相比，在同等條件下，改進(jìn)方案所產(chǎn)生的光載毫米波信號通過光纖傳輸時能有效抑制光纖色散的影響，無碼元縮窄效應(yīng)，改善了系統(tǒng)誤碼性能。
[Abstract]:Optical radio frequency communication radio-over-Fiberro) fully combines optical fiber communication with radio frequency communication, uses optical fiber link as the transmission medium of radio frequency signal, and makes full use of optical fiber communication with large capacity and low loss. It can effectively resist the characteristics of electromagnetic interference and the advantages of flexible and efficient radio frequency communication, and can effectively solve the bandwidth in future broadband wireless communication. The requirement of capacity and transmission distance. The generation method of light-borne millimeter-wave signal is one of the key technologies to realize ROF communication. In this paper, the generation method and transmission characteristics of light-borne millimeter-wave signal are studied. It mainly includes two aspects: one is to analyze and summarize the existing methods of millimeter-wave signal generation, the other is to propose an improved method of millimeter-wave signal generation. The first aspect includes the introduction of direct modulation, external modulation, optical heterodyne modulation, etc. In this paper, the spectrum structure of the optical millimeter-wave signal generated by external modulation is derived theoretically.) how to adjust the modulator bias and the local oscillator signal to produce the two-sided band DSBs, single sideband SSBs) and the optical carrier suppression (OCS) two-sided band three optical millimeter-wave signals are discussed. The transmission characteristics of the three kinds of light-borne millimeter-wave signals are analyzed and evaluated in Optisystem7.0 software. The results show that the power fluctuation and fading effect exist in the optical millimeter-wave signals of the DSB system and the optical millimeter-wave signals in the OCS system have the symbol narrowing effect when they are transmitted in the optical fiber. In the second aspect, an improved scheme is put forward for external modulation technology. The idea of improvement is that the local oscillator signal is first used to modulate the light wave emitted by the continuous optical laser to produce the SSB or OCS optical millimeter wave signal. Then, the baseband signal is loaded into a frequency component of the light-loaded millimeter-wave signal, which can eliminate the power fluctuation fading effect and the symbol narrowing effect. Two improved external modulations are described in detail. The generation of improved SSB optical millimeter wave signal and improved OCS optical millimeter wave signal, The theoretical analysis and simulation results of the two schemes show that under the same conditions, the optical millimeter wave signal generated by the improved scheme can effectively suppress the influence of fiber dispersion when the optical millimeter wave signal is transmitted through the fiber. The error performance of the system is improved without symbol narrowing effect.
【學(xué)位授予單位】：中南民族大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN929.1

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