基于小波理论的光强计算方法的研究毕业论文精选.docxVIP

LANZHOU UNIVERSITY OF TECHNOLOGY毕业论文题目基于小波理论的光强计算方法的研究摘要光通信无处不在。按照不同方式的分类，光通信系统有不同的分类。当按照信道传输媒质的不同，光通信系统可以分为有线光通信系统和无线光通信系统。随着社会的发展和人们对网络随时随地的需求，无线光通信系统已经完全融入了我们的生活中。而无线光通信系统的性能很大程度上受无线光信道的影响，如地形和地物、气象变化等。所以研究无线光信道的特点以及存在的问题是无线光通信系统急需解决的问题之一，而准确计算出接收端激光信号的光强分布是提高无线光通信系统性能的一项关键技术，但是由于外界环境的影响，获取的光斑图像常常会含有噪声，这些噪声会影响光强计算的准确度。为此，本文在掌握无线光信道的特点和存在问题的基础上，利用小波理论对CCD光斑图像进行了去噪，然后通过matlab仿真工具，我们实现了各图像的三维可视化和二维直观图，比较了原始光斑图像、去噪光斑图像的光强分布，直观清晰地表现出光斑图像的光强分布信息，从而得到准确度较高的光强分布。关键词：小波理论、光斑图像、去噪、光强分布AbstractOptical communication is exist everywhere. According to the different ways of classification , optical communication systems have different classifications. When according to different the transmission medium of channel, optical communication systems can be divided into wired optical communication systems and wireless optical communication systems. With the social development and peoples needanytime and anywhere on the network , wireless optical communication system has been fully integrated into our lives . The performance of wireless optical communications is largely affected by the radio channel , and surface features such as topo- graphy , weather changes . So study the characteristics of the wireless optical graphy , weather changes . So study the characteristics of the wireless optical solve the problem, and accurately calculate the receiving end of the light intensity distribution of the laser signal is a key technology to improve wireless optical communication system performance , but because the impact of the external environment , the spot image acquisition often contain noise that can affect the accuracy of intensity calculation . In this paper, the master radio channel characteristics and existing problems on the spot using wavelet theory CCD image de-noising , then matlab simulation tools, we realized 3D image visualization and intuitive two-dimensional map, clear and intuitive demonstration spot image intensity distribution of information , comparison of the original