以最大概似法之智慧型中繼策略用於多輸入輸出中繼站網路

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洪培文(Pei-wen Hung) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

以最大概似法之智慧型中繼策略用於多輸入輸出中繼站網路
(ML-based Intelligent Relaying Strategy for MIMO Relay Networks)

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摘要(中)

在現有的無線通訊系統中，使用中繼站 (Relay) 以增加
傳輸的效能和訊號傳輸範圍已是未來的趨勢，在現有的中繼站傳輸策略中，較常見的有放大後傳輸 (Amplify-and-Forward,AF)，即在中繼站將接收訊號放大後傳輸，與解調後傳輸 (Decode-and-Forward,DF)，即在中繼站將接收訊號做解調之後再放大傳輸。但兩種策略有各自的優缺點，AF 對通道增益的影響較敏感，而 DF 需要在中繼站接收到可靠的訊號。本篇提出以最大概似比 (MaximumLikelihood,ML) 為偵測訊號的 MIMO 模型，在兩種傳輸策略中做決策，選擇要用何種方式傳輸，分析 BPSK、QPSK、16QAM 三種調變方式的錯誤率後，利用切爾諾夫邊界 (Chernoff bound) 取上界算出平均錯誤率 (Average Error Probability)，以簡易的判斷式做決策。一方面降低回傳通道資訊 (Channel State Information,CSI) 的即時性，一方面提出將既有傳輸方式最佳化的策略。

摘要(英)

Using relays to improve the performance and extend cover-
age area is the future trend in modern wireless transmission systems.Amplify-and-Forward (AF) and Decode-and-Forward (DF) are the most popular strategies discussed for relay transmission. AF and DF have their specific disadvantages, e.g. AF is sensitive to channel gains while DF requires reliable received signals. This thesis proposes to make decision between two transmission strategies for relay based on the ML-based MIMO transmission model. To find an intelligent strategy, we analyze three modulation types, including BPSK, QPSK and 16-QAM, and make
decision rely on the average error probability obtained by the Chernoff
bound. The proposed decision strategy does not need the Channel State Information(CSI) in time for reaching optimum performance.

關鍵字(中)

★ 中繼網路
★ 放大並傳輸策略
★ 解碼並傳輸策略
★ 合作式通訊

關鍵字(英)

★ relay network
★ Amplify-and-forward strategy
★ Decode-and-forward strategy
★ Cooperative communication

論文目次

中文摘要.....................................i
英文摘要.....................................iii
目錄.....................................i
圖目錄.....................................iii
表目錄 .....................................iv
第 1 章序論.....................................1
1.1 前言.....................................1
1.2 章節架構.....................................4
第 2 章Relay 用於 MIMO 傳輸系統架構.....................................5
2.1 系統架構.....................................5
2.2 Relay 端傳輸策略 1:AF.....................................8
2.3 Relay 端傳輸策略 2:DF.....................................10
2.4 小結.....................................12
第 3 章Relay 端使用策略之決策法.....................................14
3.1 Amplify-and-Forward(AF) 錯誤率.....................................14
3.1.1 AF 在 BPSK 調變之位元錯誤率.....................................14
3.1.2 AF 在 QPSK 調變之符元錯誤率.....................................15
3.1.3 AF 在 16-QAM 調變之符元錯誤率.....................................16
3.2 Decode-and-Forward(DF) 錯誤率.....................................17
3.2.1 DF 在 BPSK 調變之位元錯誤率.....................................17
3.2.2 DF 在 QPSK 調變之符元錯誤率.....................................19
3.2.3 DF 在 16-QAM 調變之符元錯誤率.....................................20
3.3 上界逼近值 (upper bound) 與機率分布介紹.....................................21
3.3.1 平均錯誤率.....................................21
3.3.2 上界逼近值－切爾諾夫邊界 (Chernoff bound).....................................22
3.3.3 機率分布變化.....................................24
3.4 平均錯誤率計算.....................................27
3.4.1 AF 在 BPSK 調變之平均位元錯誤率上界.....................................27
3.4.2 AF 在 QPSK 調變之平均符元錯誤率上界.....................................28
3.4.3 AF 在 16-QAM 調變之平均符元錯誤率上界.....................................29
3.4.4 DF 在 BPSK 調變之平均位元錯誤率上界.....................................29
3.4.5 DF 在 QPSK 調變之平均符元錯誤率上界.....................................31
3.4.6 DF 在 16-QAM 調變之平均符元錯誤率上界.....................................32
3.5 考慮直線通道的錯誤率計算.....................................34
3.5.1 考慮直線通道之 AF 和 DF 錯誤率.....................................34
3.5.2 考慮直線通道之 AF 和 DF 平均錯誤率.....................................36
3.6 使用平均錯誤率決策 (Desicion).....................................39
第 4 章系統模擬與結果分析.....................................40
4.1 系統模擬參數.....................................41
4.2 BPSK 之位元錯誤率模擬.....................................41
4.2.1 通道增益比較.....................................42
4.2.2 放大係數比較.....................................47
4.2.3 exact value 與 upper bound 的平均錯誤率比較.....................................49
4.2.4 使用迴旋編碼 (Convolutional code) 傳輸.....................................51
4.2.5 合作式傳輸.....................................54
4.3 QPSK 之符元錯誤率模擬.....................................58
4.4 16-QAM 之符元錯誤率模擬.....................................62
第 5 章結論.....................................65
參考文獻 .....................................66

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指導教授

張大中(Dah-chung Chang)

審核日期

2013-8-27

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