UWB室内环境射线跟踪算法研究通信与信息系统专业毕业论文.docx

Abstract
Ultra-WideBand (UWB) has been received much attention since 1990. munication pattern uses ultra narrow pulse to transport data bit, and forms the bandwidth about 1GHz, at the same time. The transmission speed is about 500M/sec and even higher. The available transmission space is usually 10 meters due to the limitation in the send power. So it is mainly used for speed data transmission indoor. Considering that there is multipath interferece indoor, which leads to the decline of the transmission signal in path loss and multipath loss. Therefore, it's necessary to study the channel models.
In the present thesis, we mainly study the UWB model and some simulations. Generally speaking, the forecasting methods of the wireless electric wave propagation can be classified as two categories: one is pulse and response, which is to establish the empirical model based on experimental and statistical data, the other is ray tracing, which is to establish the deterministic model based on theoretical analyses. Firstly, we introduces mon Path Loss transmission model in the UWB system, also points out the localization of these models based on experiential methods. Then, we study the basic principles, methods and advantages of using the ray tracing technique for forecasting the wireless electric wave propagation. The model takes into account numerous rays that undergo reflections from ground and wall surfaces and refraction. The exact location of reflection and refraction points is essential in order to calculate the ponents of the reflected and diffracted fields and their trajectories. Then, a vector addition of the received fields is carried out to obtain the total received field strength and, subsequently, the path loss along a predetermined route. Combined with the results of simulation, the thesis further analyses the effect on waveform with depolarization of antenna and different materials, the azimuth angle and Azimuth plane of the ray are also given.
Keywords UWB, ra