【摘要】：為了滿足人們對(duì)高速數(shù)據(jù)通信的需求,光載無線通信技術(shù)應(yīng)運(yùn)而生。光載無線通信以其高寬帶傳輸,大容量,抗干擾性強(qiáng),價(jià)格實(shí)惠,無線接入靈活的特點(diǎn),受到人們的廣泛關(guān)注。然而,光載無線通信系統(tǒng),在大動(dòng)態(tài)范圍OFDM調(diào)制信號(hào)作用下ROF鏈路存在較強(qiáng)的動(dòng)態(tài)非線性失真,從而影響系統(tǒng)的功率效率和通信質(zhì)量。另外,射頻功放作為無線通信系統(tǒng)的關(guān)鍵設(shè)備,其同樣存在較強(qiáng)的靜態(tài)和動(dòng)態(tài)非線性失真。因而無論是ROF鏈路,還是射頻功放都存在強(qiáng)非線性失真,都需要消除和抑制非線性失真。傳統(tǒng)方法將ROF鏈路和功放分開進(jìn)行線性化,造成系統(tǒng)結(jié)構(gòu)復(fù)雜。因而,迫切需要將ROF鏈路和功放作為整體進(jìn)行非線性建模和線性化研究。本文主要對(duì)現(xiàn)有功放相關(guān)線性化技術(shù)以及ROF技術(shù)作一些介紹。通過實(shí)驗(yàn)?zāi)M通信的方式,搭建包括ROF鏈路,功率放大器在內(nèi)的ROF前傳系統(tǒng)。在對(duì)ROF鏈路上的非線性,以及對(duì)功放的非線性進(jìn)行研究和分析。通過現(xiàn)有的線性化技術(shù)以,應(yīng)用MATLAB, Toolkit軟件,數(shù)字預(yù)失真的相關(guān)模型進(jìn)行建模,通過對(duì)比模型間系數(shù)數(shù)量,數(shù)據(jù)訓(xùn)練復(fù)雜度,建模精度(NMSE),來比較建模效果。結(jié)果表明使用并行兩廂模型適用于OFDM這種較大動(dòng)態(tài)范圍的LTE信號(hào)的非線性建模。在ROF鏈路系統(tǒng)的非線性所建立的模型中,精度有所改進(jìn),對(duì)比廣義記憶多項(xiàng)式多項(xiàng)式模型在系數(shù)數(shù)量上減少了42%,從而降低了復(fù)雜度。
[Abstract]:In order to meet the needs of high-speed data communication, optical wireless communication technology emerges as the times require. Optical wireless communication has attracted extensive attention because of its high broadband transmission, large capacity, strong anti-interference, affordable, flexible wireless access. However, in the optical wireless communication system, the ROF link has strong dynamic nonlinear distortion under the action of large dynamic range OFDM modulation signal, which affects the power efficiency and communication quality of the system. In addition, as the key equipment of wireless communication system, RF power amplifier also has strong static and dynamic nonlinear distortion. Therefore, both ROF links and RF amplifiers have strong nonlinear distortion, which needs to be eliminated and suppressed. The traditional method linearizes the ROF link and the power amplifier separately, which leads to the complexity of the system structure. Therefore, it is urgent to study the nonlinear modeling and linearization of ROF link and power amplifier as a whole. In this paper, the existing power amplifier related linearization technology and ROF technology are introduced. Through the experimental simulation of communication, the ROF pretransmission system, including ROF link and power amplifier, is built. The nonlinear of ROF link and the nonlinear of power amplifier are studied and analyzed. Through the existing linearization technology, the related models of digital predistortion are used to model with MATLAB, Toolkit software, and the modeling effects are compared by comparing the number of coefficients between models, the complexity of data training and the modeling accuracy of (NMSE),. The results show that the parallel two-box model is suitable for nonlinear modeling of LTE signals in a large dynamic range, such as OFDM. In the nonlinear model of ROF link system, the accuracy is improved, and the number of coefficients is reduced by 42%, thus the complexity is reduced.
【學(xué)位授予單位】：云南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN929.5

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本文編號(hào)：2500615