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首页> 外文学位 >Line-of-sight propagation of optical wave through multiple-scatter channel in optical wireless communication system.
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Line-of-sight propagation of optical wave through multiple-scatter channel in optical wireless communication system.

机译：光波在光学无线通信系统中通过多散射通道的视线传播。

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摘要

Recently, the use of free-space optical (FSO) communications in urban environments has brought new attention to the study of optical wave propagation through clouds and fog. This application is often referred to as optical wireless communication (OWC) for the short horizontal links. The OWC links often perform poorly in adverse weather conditions such as fog and low clouds. Fog is composed of droplets of water vapor suspended in the air near the ground. These fog droplets are only a few microns in diameter, but can modify light propagation characteristics or completely hinder the passage of light through a combination of absorption, scattering and reflection. Understanding the optical propagation channel characteristics of fog will provide the critical information necessary to design OWC systems and to improve link performance.; The purpose of this study is to characterize the optical propagation channel to determine the link performance in different fog conditions. Random media such as fog in the atmosphere impede link performance by reducing available power at the receiver. We focus our study on the attenuation and wave distortion of the received signal. In a numerical study, a modified pulse vector radiative transfer (RT) equation is used to obtain the specific intensity of the received signal. We solved the equation numerically by using the Fortran radiative transfer code. Then the data was analyzed using Matlab.; We study the propagation channel characteristic by comparing the forward intensity of the received signal at different modulation frequencies, optical depths and receiver fields of view (FOVs) as a function of time. The attenuation and the phase lag cause a wave distortion in the received signal. The wave distortion induces a bit error rate, and therefore, limits the throughput of OWC communication. Therefore, if we understand the relationship between the effects of random media and the distortion in optical wave and also the effects of the communication system parameters on this distortion, we will be able to design a better OWC system to improve link performance.
机译：最近，在城市环境中使用自由空间光（FSO）通信已引起人们对光波通过云层和雾传播的研究的新关注。对于短水平链路，此应用程序通常称为光无线通信（OWC）。在不利的天气条件下，例如雾和低云，OWC链接通常表现不佳。雾由悬浮在地面附近空气中的水蒸气滴组成。这些雾滴的直径只有几微米，但是可以通过吸收，散射和反射的组合来改变光的传播特性或完全阻碍光的通过。了解雾的光传播通道特性将提供设计OWC系统和改善链路性能所需的关键信息。这项研究的目的是表征光传播通道，以确定在不同雾条件下的链路性能。大气中的雾等随机介质会降低接收器的可用功率，从而影响链路性能。我们将研究重点放在接收信号的衰减和波形失真上。在数值研究中，使用修改后的脉冲矢量辐射传输（RT）公式来获得接收信号的特定强度。我们使用Fortran辐射传递码对方程进行了数值求解。然后使用Matlab分析数据。我们通过比较不同调制频率，光学深度和接收器视场（FOV）随时间变化的接收信号的前向强度来研究传播信道特性。衰减和相位滞后在接收信号中引起波形失真。波形失真会引起误码率，因此会限制OWC通信的吞吐量。因此，如果我们了解随机介质的影响与光波畸变之间的关系以及通信系统参数对此畸变的影响，我们将能够设计出更好的OWC系统来改善链路性能。

著录项

  • 作者

    Ketprom, Urachada.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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