臺灣博碩士論文加值系統

在一個存在著竊聽者的合作式通訊系統當中, 我們採用干擾訊
號的方式去改進系統的物理層安全性。 我們所考慮的系統中
，中繼點傳送訊號的方式是以解碼後傳輸為方式。 另外，在
我們的系統假設中，傳輸端到接收端沒有直接的傳輸路徑, 因
此傳輸訊號均需要透過中繼點的輔助。 因為在合作式網路中
，中繼點有許多個且每個中繼點傳輸路徑的通道增益不同， 因此
，本論文考慮選擇最佳中繼傳輸路徑使得中斷機率最小。最
後，本論文則進一步分析我們提出的方法中所得到的中斷機
率值。本論文並使用電腦模擬去驗證我們的中斷機率分析且
確認我們提出方法的有效性。

In this thesis, a scheme using jamming signal is adopted to improve the physical-
layer security of a decode-and- forward cooperated relay network in the presence of
eavesdroppers. In addition, it is assumed that there is no direct link between the
source and the destination. As a result, the data transmission from the source to the
destination is all through the relay links. Since there exists many relays in the
cooperated network and each relay link has a different channel gain, this thesis
considers an optimization problem, in which the outage probability of the
cooperated system is minimized by selecting a best relay link. This thesis then
analyzes the outage probability using the proposed relay selection scheme. Finally,
this thesis then conducts computer simulations to verify the analyzed outrage
probability and confirm the validity of the proposed method.

1序論1
1.1背景以及研究動機1
1.2文獻回顧3
1.3研究方法4
1.4論文架構4
2系統模型6
2.1解碼後傳輸合作式系統模型6
2.2功率分配8
2.3中繼點選擇10
2.4中斷機率分析11
3 結果和分析14
3.1模擬一14
3.2模擬二18
3.3模擬三21
4結論23
[參考文獻24]

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