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研究生：	陳宏承 Cheng, Hung-Chen
論文名稱：	正交分頻多工存取架構下使用網格編碼之合作式通訊 OFDMA-Based Cooperative Communications with Network Coding
指導教授：	張名先 Chang, Min-Xian
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電腦與通信工程研究所 Institute of Computer & Communication Engineering
論文出版年：	2010
畢業學年度：	98
語文別：	英文
論文頁數：	47
中文關鍵詞：	合作式多樣性、正交分頻多工存取技術、LDPC碼、網格編碼、合作式-MRC
外文關鍵詞：	cooperative diversity, OFDMA, LDPC code, network coding, C-MRC
相關次數：	點閱：165 下載：0
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多重輸入與多重輸出系統開發空間上的多樣性來有效的減少通道衰減的影響。然而，許多無線通訊的設備由於尺寸或硬體複雜度的限制，無法裝備多根天線。因此，引進了合作式多樣性的概念。合作式的多樣性能使多用戶環境中裝備一根天線的移動節點分享他們的天線來構成一個多天線的傳送器並達成空間上的多樣性。
在這篇論文裡，我們發展了一些以正交分頻多工存取技術為基礎並結合網格編碼的合作式多樣性的架構。我們採用解碼-重傳的中繼轉傳方式。針對解碼-重傳的中繼轉傳方式有許多解調方法被提出，而合作式-MRC被證明可以在較低複雜度的情況下有著與ML解調幾乎相同的效能。因此，我們首先結合了C-MRC與合作式網格編碼系統，而且證實其可以實現完整的多樣性。然後在多個用戶多個中繼的情況下，我們結合了LDPC碼去編碼接收到的信號，而發展出更有效益的方法去實現空間多樣性。

MIMO systems exploit the spatial diversity attributes to mitigate the ill effects of the fading channels. However, many wireless devices can not support multiple antennas due to size or other constraints, therefore, the concept of cooperation diversity has been introduced. Cooperative diversity enables single antenna mobiles in a multi-user environment to share their antennas and generate a virtual multiple-antenna transmitter that allows them to achieve spatial diversity.
In this thesis, we develop some cooperative diversity joint network coding schemes based on OFDMA systems. We adopt decode-and-forward (DF) as our relaying method. Many detection schemes have been proposed for the DF, but it has been shown that the cooperative maximum ratio combining (C-MRC) can achieve almost the same performance as the optimum likelihood detector and has a much lower complexity. Therefore, we first combine the C-MRC with the cooperative network coding and show that it can achieves substantial diversity order even though the inter-user channel is noisy. And in the multi-user multi-relay condition, we joint design of LDPC code, encode the incoming symbols according to the cooperative block code, and develop an effective way to achieve spatial diversity.

Chinese Abstract I
English Abstract II
誌謝 III
Contents IV
List of Figures VI
List of Tables VIII
Chapter 1 Introduction 1
Chapter 2 System Model 3
2.1 Introduction to OFDM...........................3
2.2 Introduction to OFDMA..........................6
2.3 Fading Channel...............................6
2.3.1 Multipath Model..........................7
Chapter 3 Introduction to Cooperative Diversity 8
3.1 System Model................................8
3.2 Cooperative Relaying Method.......................10
3.3 Cooperative Maximum Ratio Combining.................10
Chapter 4 Network Coding Based Cooperative Scheme 13
4.1 Introduction to Network Coding......................13
4.2 Cooperative Network Coding........................14
4.2.1 Network Coding in Physical Layer.................14
4.2.2 System Model............................15
4.3 Decoding Algorithm............................17
4.3.1 Maximum-Likelihood Decision...................17
4.3.2 Maximum Ratio Combining....................18
4.3.3 C-MRC in Perfect Inter-User Channel..............19
4.3.4 C-MRC in Non-Perfect Inter-User Channel............20
4.4 Cooperative Network Coding with Multi-Relay System.........21
4.4.1 Power Allocation Method.....................22
4.5 Relay Bandwidth Saved Cooperative Network Coding System.....23
4.6 Simulation Results.............................24
Chapter 5 Multi-User Multi-Relay Cooperative Scheme 29
5.1 Cooperative Code with Block Code....................29
5.1.1 ML Decision of Cooperative Block Code.............30
5.1.2 C-MRC of Cooperative Block Code................32
5.2 Cooperative LDPC Code..........................33
5.2.1 Introduction to LDPC Codes...................33
5.2.2 Cooperative Code with LDPC Code................35
5.3 Selection Decode to LDPC Codes.....................36
5.4 Multi-Hop Scenario.............................38
5.5 Simulation Results.............................39
Chapter 6 Conclusion 44
Bibliography 46
                                    

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[8] A. Sendonaris, E. Erkip, and B. Aazhang. User cooperation diversity. part i. system description. IEEE Trans. on Commun., 51(11):1927-1938, Nov. 2003.

[9] A. Sendonaris, E. Erkip, and B. Aazhang. User cooperation diversity. part ii. implementation aspects and performance analysis. IEEE Trans. on Commun., 51(11):1939-1948, Nov. 2003.

[10] T. Wang, A. Cano, G. B. Giannakis, and J. N. Laneman. High-performance cooperative demodulation with decode-and-forward relays. IEEE Trans. on Commun., 55(7):1427-1438, July 2007.

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