Information Flow Scheduling and System Performance Analysis in Fourth Generation Wireless Communication System

Autor: Sheng-Bo Huang, 黃聖博
Rok vydání: 2009
Druh dokumentu: 學位論文 ; thesis
Popis: 97
Along with the evolution of wireless communication techniques and increasing service demand of common users, the data quantity and the service quality which provided by the existing communication systems are no longer satisfied by the users. As the 3rd generation communication systems were well developed, the new standards which meet the new requirement are also being established by some standard bodies such as the IEEE which is proceeding in the establishment of IEEE802.16m standard that is the extension of the WiMAX (IEEE802.16e) specification, and LTE (Long Term Evolution)-Advanced standard that is being developed by 3GPP. These two standard bodies are competing for the 4th generation mobile communication technical standard. From the multiplexing access point of view, the IEEE 802.16m adopts the OFDMA (Orthogonal Frequency Division Multiple Access) in both of its Downlink (DL) and Uplink (UL) accesses, while it uses OFDMA technique in its DL transmission and implements SC-FDMA (Single Carrier- Frequency Division Multiple Access) in the UL for LTE standard. Either of these two access techniques can simultaneously allocate frequency bands for users in their transmissions. It becomes an important issue in system design of how to properly allocate time and frequency resources for various classes of users. In this study, we consider the use of Genetic Algorithm (GA) technique in the processing of time and frequency resource allocations. By using the prominent convergence property of GA,the base stations can efficiently and effectively distribute their transmission resources. We are then through simulations to compute the possible amount of resource allocation when GA is exploited and compares its results with that without using GA. In this study we also consider the implementation of multi-carrier operations in the system so that to provide wider bandwidth services to users and meanwhile to investigate how to exploit the GA technique in the implementation of resource allocations in the multi-carrier operationenvironment.
Databáze: Networked Digital Library of Theses & Dissertations
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