Modeling of Radio Multipath Fading Channels in Picocellular and Microcellular Environments
| Autor: | Yue-Jing He, 何岳璟 |
|---|---|
| Rok vydání: | 2000 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 88 In this thesis, we present the hybrid model to research the characteristic of multipath fading in picocell (indoor) and microcell (urban). It is composed of 2-dimension adaptive site-specific model and scattering model. Adaptive site-specific model comprises the reflection, scattering and transmission effect of boundary in the transmission environment. Scattering model can be used to describe the scattering field as a result of random distribution of scattering object and the rough surface boundary. It is found that this treatment can decrease the number ray-tree levels of the site-specific model and saves a lot of computational time. In addition to accurately predicting mean field strength, the hybrid model can effectively quantify the contribution of scattering field (relative to mean value) with the relative scattering factor r. A large amount of experiment data at many different sites (2.44GHz for picocell, 900MHz for microcell) shows that a Nakagami distribution describes the fading distribution well in picocellular and microcellular environment. After measuring live on the spot, we find that in the picocell: (1) r = 0.65~0.72 if the receiving or transmitting antenna is in a heavy cluttering environment; (2) r = 0.26~0.35 if the receiving or transmitting antenna is in a light cluttering environment. While in microcell model, r = 0.1~0.2 because both transmitting and receiving are in light cluttering environment, it can model the statistical characteristic of multipath fading in different environment effectively. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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