臺灣博碩士論文加值系統

未來IMT 2000 將結合太空與地面系統以提供全球無接縫之多媒體通訊服務。在太空通訊部份，因天線小、低傳輸損失、延遲短等因素，低軌道衛星系統是較佳的選擇。然，因軌道低，衛星飛行速快，如何降低頻繁交遞所造成的通訊中斷，便成為重要的研究課題。
另一方面，在地面部份，個人行動通訊系統將採用大、小細胞並存的服務模式。尤其在通訊量非均勻分佈的情況下，小細胞可提供都會人口稠密區，高容量，低功率的服務，而大細胞整體上的優點在於：可服務快速移動的用戶、降低基地台的架設成本、以及確保通訊範圍的廣闊。這篇論文主要是探討針對衛星系統與地面系統不同的環境及特性，研究較佳的無線通道及功率配置策略，以提供系統較大的通訊容量及較好的服務品質。

Future IMT-2000 (International Mobile Telecommunications after the year 2000) are expected to be integrated by terrestrial and satellite components to provide a seamless, wide rang of coverage areas, system capacity, and available service types for personal communications. In the space segment, low-earth orbit (LEO) satellite based systems are preferred with the consideration of some technical issues such as transmission delay, path loss, antenna aize, etc.. However, because of the short period for which the satellites are visible, users of LEO satellite systems face frequent handoff requirements between spot-beams (cells).
In the terrestrial part, cellular communication infrastructures envision to adopt hierarchical, multisized cells for covering non-homogeneous populated areas. Microcells have significantly higher capacity than large cells and are more cost-effective in reducing power consumption in densely populated districts. Meanwhile, large cell systems (macrocells) avoid the need for frequent cell boundary crossings (handovers) to serve high mobility mobile users.
In this thesis, based on the different features of the terrestrial and LEO satellite-based systems, we study some channel and power allocation strategies and show that these schemes can provide larger capacity and better performance for the cellular communication systems.

Chapter1 Introduction
1.1Space Segment: LEO Satellite Based Communication Systems
1.2Terrestrial Segment: Hierarchical CDMA Cellular Communication Systems
1.3The Organization of This Thesis
Chapter 2 Handoff Issue for LEO Satellite Systems’
2.1 Overview
2.2 Proposed Strategy
2.3 Performance Evaluation
2.4 Numerical Results and Discussions
Chapter 3 Enhanced MAHO Scheme
3.1 Overview
3.2 Enhanced MAHO Strategy
3.3 Performance Evaluation of Scheme 1
3.4 Performance Evaluation of Scheme v
3.5 Numerical Results and Discussions
Chapter 4 Power Allocation Strategy
4.1 Overview
4.2.1 Cell Structure
4.2.2 Propagation Model
4.2.3 Performance Evaluation
4.2.4 Expanded Cases
4.3 Numerical Results and Discussions
Chapter 5 Hierarchical Cellular Systems
5.1Overview
5.2System Model
5.2.1Hierarchical Cellular Structure
5.2.2Non-Uniform Population Distribution
5.2.3Proposed Schemes
5.2.4Performance Evaluation
5.3Numerical Results and Discussions
Chapter 6 Conclusions and Future Works
Appendix A Derivation of Equations

Appendix B Brief Description of DCA1 and DCA2

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