臺灣博碩士論文加值系統

伴隨著科技的進步，無線通信系統已經從第一代發展到第四代。特別在前幾年，為了應對WiMAX (Worldwide Interoperability for Microwave Access)寬頻無線技術移動化的競爭，3GPP (Third Generation Partnership Project)啟動了移動通信系統(UMTS: Universal Mobile Telecommunications System) 的LTE (Long Term Evolution)項目，對以往蜂巢式細胞網路進行了革命性的演進。
蜂巢式無線通信系統的向前發展，吸引了越來越多的移動用戶，給蜂巢網路帶來了商機，另外客戶的要求也越來越高，帶來商機的同時也帶來了壓力，比如頻寬資源有限還有容量受限的壓力，本文基於這種情況下，提出了採用了新型的技術，可以有效地使資源使用效率大大的提升。
Device to Device (D2D)通訊系統是一種在LTE系統中通過重用蜂巢式網路使用者設備(Cellular user equipment ; CUE) 的資源來實現點到點通信的新型技術。首先本論文會先對D2D技術的原理進行介紹，並且比較D2D跟一些類似的技術。接著會引用一種降低干擾的方法[1]並加以修改和所提出資源分配演算法，使CUE及D2D整體效能不會因受到干擾而有所下降。

With the advances of technology, the wireless communication system has developed into the fourth generation. One of the schemes that is being researched and considered for 4G LTE Advanced (LTE-a) is the concept of Device to Device (D2D) communication. D2D also brings revolutionary progress in cellular system.
The D2D is a machine to machine standard by reusing CUE’s spectrum in LTE-a. Firstly, this thesis will introduce the concept of D2D and compare it with other similar technologies. According to [1], we then adopt an interference-mitigation method and resource allocation algorithm to ensure the whole performance of CUE and D2D would not degrade due to the interference. As a result, the severe-interfered area could be efficiently separated in our simulation.

摘要 1i
Abstract ii
目錄 iii
圖目錄 v
表目錄 vii
第一章緒論 1
1.1 前言 1
1.2 研究背景與動機 2
1.3 論文架構 4
第二章背景介紹 5
2.1 第四代行動通訊簡介 5
2.1.1 OFDM和OFDMA技術 6
2.1.2 通道頻寬及訊框結構 8
2.2 MACRO-CELL系統 11
2.3 D2D通訊系統 12
2.3.1 D2D通訊鍊路建立流程 14
2.3.2 相比蜂巢系統的性能改善 16
2.3.3 D2D與其他類似技術的不同 17
2.3.4 D2D的相關研究議題 18
2.3.5 D2D系統研究現狀 22
第三章干擾限制區域 23
3.1 動機 23
3.2 干擾限制區域 26
3.3 資源分配演算法 34
第四章模擬環境 35
4.1 模擬環境介紹 35
4.2 路徑衰減模型 36
4.3 SINR計算 38
4.4 參數設定 39
4.5 吞吐量計算方式 40
第五章模擬結果與數據分析 41
5.1 D2D通訊鏈路位置與限制區域的範圍 41
5.2系統效能分析 44
第六章結論與未來展望 47

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