紫外光湍流信道中调制技术的研究

发布时间：2018-05-21 10:42

  本文选题：紫外光通信 + 调制技术　； 参考：《西安理工大学》2017年硕士论文

【摘要】：紫外光通信是无线光通信的一种新类型,由于其在军事方面的广泛应用,从而得到国内外专家的重视。臭氧层对深层紫外光(200～280纳米)波段的紫外光具有强烈的吸收作用,紫外光在到达地球表面时,深层紫外光已经非常微弱,形成所谓的“日盲区”,无线紫外光正是利用此波段范围内的紫外光进行信息传输的。“日盲”紫外光不但具有传统的无线光通信的优点,而且在非直视传输、保密性好、全天候、抗干扰和抗截获方面具有非常大的优势,从而非常适合复杂环境下的保密通信。国内外对无线紫外光通信的研究目前多集中于提高无线紫外光通信性能方法以及信道仿真理论模型和紫外光组网技术的研究,并取得了一定成果,但对于存在大气湍流的紫外光通信信道性能研究比较少,本文在基于紫外光大气传输理论的基础上主要对大气湍流下的紫外光信道特性以及调制技术进行了研究,具体工作如下:(1)论述了紫外光大气传输的基本理论,在此基础上建立了紫外光通信的两种模型:直视通信模型和非直视通信模型,基于此模型建立了无线紫外光大气湍流信道模型,并分析了接收端信号强度分布的概率密度函数。(2)建立了紫外光斜程通信的几何链路模型,研究了四种不同大气湍流模型下收发距离对水平通信、垂直通信和斜程通信三种不同场景的紫外光通信信号强度分布的影响。最后实测了三种场景下,收发端距离对紫外光接收功率的影响,结果表明:接收光功率随着收发端距离的增大呈减小的趋势,且通信质量随之下降。(3)对紫外光常用调制方式性能进行了分析,推导了对数正态分布(log-normal)下紫外光直视和非直视的四种调制方式开关键控(OOK)、脉冲位置调制(PPM)、脉冲幅度调制(PAM)、正交幅度调制(QAM)的误码率公式,随后仿真分析了这四种调制方式误码性能的影响。结果表明,当信噪比相同时,四种调制方式中,PPM的性能最优,其次是OOK,QAM的性能最差,随着调制阶数的增加,PPM的这种优势会更明显。四种调制方式在紫外光湍流信道的误码率远远大于其他通信传输信道的误码率。综上所述,本文主要研究了紫外光通信在不同大气湍流信道、不同场景下的信号强度分布情况以及湍流信道下紫外光的调制技术。
[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.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.1

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