臺灣博碩士論文加值系統

在現今的無線通訊發展過程中，因多媒體網路的興起，拉動了對於訊息傳播所需要的媒介，所創造出的無線頻寬需求隨著各式運用訊速拉升，合作式通訊利用空間多樣性改善無線通訊系統的效能；無線通訊系統合作式通訊架構之下，所有節點均可同時扮演著發端送節點、中繼節點以及接收端節點三個不同的角色；透過節點與節點之間相互的串接與轉發，使得傳輸資訊更為可靠、傳輸率更高，也因此簡化了硬體的複雜度與成本，進而降低整個基礎建置的需求達成低成本的網路建置，因此如何在最大的安全容量下利用合作式通訊系統進行傳輸成為了一個重要的議題。
在大多數無線傳輸過程之中，因各節點間均處在開放式的環境下進行空中傳播，所以大多數情況之下安全威脅多來自訊號欄截以及中繼站偽裝的資訊竊取，傳統上利用金鑰進行封包加解密的過程，需花費大量的運算資源，一般屬於上層處理，事實上，實體層即具安全的傳輸能力。
為了求得最大安全容量下的中繼站選擇，本論文使用了放大後傳送機制、編碼後傳送機制，並利用，最大比例組合及選擇性組合為接收端機制得到最大的吞吐量。而在最大安全容量的計算上，我們使用了暴力法以求得最佳的結果，以驗證演算法的有效性。

In the wireless communication development of nowadays, the need for information communicating medias is also elevated by prosperity of multi-media internet. The created wireless bandwidth demand is rapidly growing with various applications, and cooperative communication could support to improve wireless communication system efficiency through Spatial Diversity. In the wireless communication system based on the cooperative communication, all nodes can take different roles simultaneously as node for sending, node for relay, and receive destination. Through mutual association and forwarding among nodes, this could lead to a more reliable and efficient information transmission. With these facts, the hardware complexity and cost could be lowered and reduce demand for basic establishment to build a low-cost internet. Therefore, how to use cooperative communication system to transmit with maximum security capacity has become an important issue.
In most wireless transmission, each node proceeds broadcast in the air in open environment, and hence most security threats would come from signal interception and information eavesdropping by disguised relay. Traditionally, the process of packet encryption and decryption with key needs to cost massive calculation resource which is the process in high level of network. However, physical layer actually has the safely transmission ability.
To achieve relay selection with maximum secrecy capacity, this article applies AF mode and CF mode to compliment with MRC and SC as receive station mode to achieve maximum bandwidth capacity. On the maximum security capacity calculation, we apply method of exhaustion to achieve best result and to prove effectiveness of the algorithm.

摘要 I
Abstract III
目錄 V
圖目錄 VII
表目錄 IX
第一章 緒論 1
第一節 研究背景 1
第二節 研究動機 2
第三節 研究目的 2
第四節 研究問題 2
第五節 名詞釋義 3
1. 合作式通訊 3
2. 放大後轉發模式 3
3. 解碼後轉發模式 3
4. 壓縮後轉發模式 4
第二章 文獻探討 5
第一節 沈農的安全通訊系統理論 5
第二節 無線網路威脅 6
第三節 合作式通訊系統架構 9
1. 放大後轉發模式 10
2. 解碼後轉發模式 11
3. 壓縮後轉發模式 12
第四節 窮舉演算法 15
第三章 基於最大安全容量之中繼站選擇 19
第一節 簡介 19
第二節 竊密者偽裝為中繼站 19
第三節 最大安全容量選擇 20
第四章 模擬結果與討論 25
第一節 模擬範圍 25
第二節 使用AF MODE MRC最大安全容量分析 26
第三節 使用AF MODE SC最大安全容量分析 29
第四節 使用DF MODE MRC最大安全容量分析 32
第五節 使用DF MODE SC最大安全容量分析 35
第六節 綜合分析 39
第七節 實驗結論 40
第五章 結論 41
參考文獻 43

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