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研究生:李翠芬
研究生(外文):Tsui-fen Li
論文名稱:估測後傳送中繼傳輸合作式通訊系統中之位元錯誤率分析及功率分配
論文名稱(外文):BER Analysis and Power Allocation in Cooperative Communication Systems Assisted by EF Relays
指導教授:賴坤財
指導教授(外文):Kuen-tsair Lay
口試委員:賴坤財
口試日期:2012-07-18
學位類別:碩士
校院名稱:國立臺灣科技大學
系所名稱:電子工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:67
中文關鍵詞:合作式通訊估測後傳送功率分配高斯近似法最大概似估計法則
外文關鍵詞:cooperative communicationestimate-and-forwardpower allocationGaussian approximation methodmaximum likelihood estimation detector
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合作式通訊技術為近年來無線通訊領域增強訊號之可靠度、達到系統空間多樣性的一項有效技術,該技術主要使用中繼端之協助,傳送訊息至目的端,藉此改善整體系統之效能。


本論文中,我們針對估測後傳送的中繼模式,在目的端使用最大概似估計法則對收到之訊號做決策,進而與放大後傳送、解碼後傳送的中繼端模式做系統效能之比較。在此,我們更試著分配來源端與中繼端的傳輸功率,促使系統平均位元錯誤率最低,並找出最佳功率分配方式。依據模擬的結果,分析三種不同中繼端傳送模式的優劣,我們得知三種中繼模式透過功率分配,系統效能皆有著較好的表現,且中繼端與來源端距離之遠近,將影響三種不同模式之系統效能。


另外一項研究重點,我們將針對使用估測後傳送之模式,推導其理論分析式計算位元錯誤率,在此,提出一個高斯近似之方法,利用此方法我們則可成功推導出此系統之理論分析式,經由電腦模擬驗證,顯示理論值與電腦模擬結果在中繼端與來源端之距離較小時,兩者結果相當吻合,即不需要電腦複雜的反覆模擬即可求得系統最低位元錯誤率。
Cooperative communication is an effective technique recently proposed to enhance signal reliability and get spatial diversity in wireless communication field.


In this thesis, for the estimate-and-forward (EF) relay mode, we use the maximum likelihood estimation (MLE) detector in the destination node to make decision for received signals. Then, we compare its system performance with amplify-and-forward (AF) and decode-and-forward (DF) mode schemes. We also try to allocate the power assigned to the source node and the relay node, so that the system bit error rate (BER) is minimized. According to the simulation results, we analyze the advantages and the disadvantages among the three different relay transmission modes. The conclusion is that this three relay modes have better BER performance when power allocation is utilized. And the distance between the relay and the source will affect the performance of this three relay modes.


Another contribution of our work is that for the EF mode, we derive the formula to calculate its BER.We propose a Gaussian approximation method. With this method the formula can be derived successfully. As verified by simulation, it is observed that the simulation results almost match the BERs that are calculated by the formula. Therefore, we do not need to use complex computer simulation to achieve the optimal BER. Instead, we can take advantage of the afore-mentioned BER formula to do it.
第一章 緒論...............................................1
1.1 引言..................................................1
1.2 研究動機..............................................2
1.3 本文架構..............................................4
第二章 合作式通訊系統架構與相關技術.......................5
2.1 合作式通訊系統模型....................................5
2.2 合作式通訊中繼協定....................................7
2.2.1 放大後傳送模式......................................7
2.2.2 解碼後傳送模式......................................8
2.2.3 估測後傳送模式......................................9
2.3 無線通道特性.........................................11
2.3.1 無線電波的傳送環境.................................11
2.3.2 傳播路徑衰減.......................................12
2.3.3 可加性白高斯雜訊...................................15
2.4 最大概似估計法則.....................................16
第三章 合作式通訊系統平均位元錯誤率分析及探討............20
3.1 系統模型.............................................20
3.2 放大後傳送模式之位元錯誤率分析及探討.................22
3.3 解碼後傳送模式之位元錯誤率分析及探討.................27
3.4 估測後傳送模式之位元錯誤率分析及探討.................30
3.5 片段線性近似法.......................................34
3.6 估測後傳送模式下使用高斯近似法.......................40
3.6.1 使用高斯近似法之位元錯誤率分析.....................40
3.6.2 不同距離對高斯近似結果之準確度探討.................43
3.6.3 功率分配與高斯近似結果之準確度探討.................44
第四章 實驗結果與討論...................................47
4.1 實驗環境及參數設定...................................47
4.2 無功率分配下不同中繼模式系統效能之比較...............48
4.3 功率分配下不同中繼模式系統效能之比較.................52
4.4 估測後傳送之位元錯誤率理論值與模擬結果討論...........58
第五章 結論與未來展望....................................63
參考文獻.................................................65
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