IEEE 802.16 Relay Stations Placement Decision-making Model Based on GA
| Autor: | Yi-chieh Sung, 宋意傑 |
|---|---|
| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 98 After years of development, WiMAX technology has matured and will soon become an indispensable technology in daily life. Because of its lower costs, the capability for farther transmission and a faster transfer rate, it has overcome the physical difficulties of building and reaching out to the areas where the traditional technology used to struggle with. WiMAX is an application of the IEEE 802.16j standards, which is the extension of IEEE 802.16e. The use of relaying and intelligent control mechanism in IEEE 802.16j improves the traditional shortcomings of noise and high costs associated with the use of a repeater or a micro-cell base station. WiMAX indeed improves the quality of reception, reduces the cost of transmission and expands the coverage of the network. The advantages of using a RS (relay station) also caused another problem around its placements of building that is very different from the traditional problem associated with the placement of a BS (base station), where an optimal deployment cannot be determined by looking at the coverage rate of a BS. Based on this, this research uses an ECC-33 path loss model to simulate a real medium-sized city environment, taking into consideration the lowest costs and the minimal total path loss to enhance the quality of reception and deployment placement. Because an issue such as a wireless transmitter placement has been proved to be an NP-hard problem, hence this research uses “Genetic Algorithm”, a method that has already been applied widely in many areas to search for an optimal solution in a given solution space. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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