本文選題：紫外光通信 + 調(diào)制技術(shù)��； 參考：《西安理工大學(xué)》2017年碩士論文

【摘要】：紫外光通信是無線光通信的一種新類型,由于其在軍事方面的廣泛應(yīng)用,從而得到國(guó)內(nèi)外專家的重視。臭氧層對(duì)深層紫外光(200～280納米)波段的紫外光具有強(qiáng)烈的吸收作用,紫外光在到達(dá)地球表面時(shí),深層紫外光已經(jīng)非常微弱,形成所謂的“日盲區(qū)”,無線紫外光正是利用此波段范圍內(nèi)的紫外光進(jìn)行信息傳輸?shù)��！叭彰ぁ弊贤夤獠坏哂袀鹘y(tǒng)的無線光通信的優(yōu)點(diǎn),而且在非直視傳輸、保密性好、全天候、抗干擾和抗截獲方面具有非常大的優(yōu)勢(shì),從而非常適合復(fù)雜環(huán)境下的保密通信。國(guó)內(nèi)外對(duì)無線紫外光通信的研究目前多集中于提高無線紫外光通信性能方法以及信道仿真理論模型和紫外光組網(wǎng)技術(shù)的研究,并取得了一定成果,但對(duì)于存在大氣湍流的紫外光通信信道性能研究比較少,本文在基于紫外光大氣傳輸理論的基礎(chǔ)上主要對(duì)大氣湍流下的紫外光信道特性以及調(diào)制技術(shù)進(jìn)行了研究,具體工作如下:(1)論述了紫外光大氣傳輸?shù)幕纠碚?在此基礎(chǔ)上建立了紫外光通信的兩種模型:直視通信模型和非直視通信模型,基于此模型建立了無線紫外光大氣湍流信道模型,并分析了接收端信號(hào)強(qiáng)度分布的概率密度函數(shù)。(2)建立了紫外光斜程通信的幾何鏈路模型,研究了四種不同大氣湍流模型下收發(fā)距離對(duì)水平通信、垂直通信和斜程通信三種不同場(chǎng)景的紫外光通信信號(hào)強(qiáng)度分布的影響。最后實(shí)測(cè)了三種場(chǎng)景下,收發(fā)端距離對(duì)紫外光接收功率的影響,結(jié)果表明:接收光功率隨著收發(fā)端距離的增大呈減小的趨勢(shì),且通信質(zhì)量隨之下降。(3)對(duì)紫外光常用調(diào)制方式性能進(jìn)行了分析,推導(dǎo)了對(duì)數(shù)正態(tài)分布(log-normal)下紫外光直視和非直視的四種調(diào)制方式開關(guān)鍵控(OOK)、脈沖位置調(diào)制(PPM)、脈沖幅度調(diào)制(PAM)、正交幅度調(diào)制(QAM)的誤碼率公式,隨后仿真分析了這四種調(diào)制方式誤碼性能的影響。結(jié)果表明,當(dāng)信噪比相同時(shí),四種調(diào)制方式中,PPM的性能最優(yōu),其次是OOK,QAM的性能最差,隨著調(diào)制階數(shù)的增加,PPM的這種優(yōu)勢(shì)會(huì)更明顯。四種調(diào)制方式在紫外光湍流信道的誤碼率遠(yuǎn)遠(yuǎn)大于其他通信傳輸信道的誤碼率。綜上所述,本文主要研究了紫外光通信在不同大氣湍流信道、不同場(chǎng)景下的信號(hào)強(qiáng)度分布情況以及湍流信道下紫外光的調(diào)制技術(shù)。
[Abstract]:Ultraviolet (UV) communication is a new type of wireless optical communication. Because of its wide application in military field, it has been paid attention to by experts at home and abroad. The ozone layer has a strong absorption effect on the ultraviolet light in the deep ultraviolet (200 ~ 280 nm) band. When the ultraviolet light reaches the surface of the earth, the deep ultraviolet light is already very weak, forming a so-called "solar blind area." Wireless ultraviolet light is the use of this band of ultraviolet light for information transmission. Sun blind ultraviolet light not only has the advantages of traditional wireless optical communication, but also has great advantages in non-direct view transmission, good security, all-weather, anti-jamming and anti-interception, so it is very suitable for secure communication in complex environment. At present, the research on wireless ultraviolet communication mostly focuses on improving the performance of wireless ultraviolet communication, the theoretical model of channel simulation and the technology of ultraviolet light networking, and some achievements have been made. However, there is little research on the performance of ultraviolet communication channel with atmospheric turbulence. Based on the theory of ultraviolet atmospheric transmission, the characteristics and modulation techniques of ultraviolet light channel in atmospheric turbulence are studied in this paper. The main work is as follows: (1) the basic theory of ultraviolet atmospheric transmission is discussed. On this basis, two models of ultraviolet communication are established: the direct view communication model and the non-direct view communication model. Based on this model, the model of wireless ultraviolet atmospheric turbulence channel is established, and the probability density function of signal intensity distribution at the receiving end is analyzed. The effects of transceiver distance on the intensity distribution of ultraviolet light in three different scenarios of horizontal communication vertical communication and oblique range communication are studied in four different atmospheric turbulence models. Finally, the effect of the distance between the transceiver and the receiver on the receiving power of ultraviolet light is measured. The results show that the power of the receiving light decreases with the increase of the distance between the transceiver and the receiver. The performance of common modulation modes of ultraviolet light is analyzed. In this paper, the error rate formulas for four modulation modes of direct and non-direct ultraviolet light under log-normal distribution (log-normal) are derived, such as open key control, pulse position modulation, pulse amplitude modulation and quadrature amplitude modulation. Then, the influence of the four modulation modes on the error performance is analyzed. The results show that when the SNR is the same, the performance of PPM is the best among the four modulation modes, and the performance of OOKO QAM is the worst. With the increase of modulation order, this advantage of PPM will be more obvious. The BER of the four modulation schemes in the UV turbulent channel is much higher than that in the other transmission channels. To sum up, this paper mainly studies the signal intensity distribution in different atmospheric turbulence channels and different scenarios, and the modulation technology of ultraviolet light in turbulent channels.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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