在這篇論文中，我們探討了在兩次躍進(Dual Hop)配置多個放大後前送型(Amplify-and-Forward, AF)中繼端(Relay, R)的系統架構下。為了維持系統全分集(Full Diversity)的特性，在來源端(Source, S)配置了多根天線並使用正交空時碼塊編碼(Orthogonal Space-Time Block Code, OSTBC)技術；各個中繼端和目的端(Destination, D)只配置了1根天線，並假設中繼端和目的端受到來自環境的獨立但不同分布的同頻干擾(Co-Channel Interference, CCI)影響。為了抵抗干擾對系統的影響，在中繼端使用中繼端最佳選擇(Best Relay Selection, B-RS)和中繼端部份選擇(Partial Relay Selection, P-RS)這兩種常見的選擇技術，選擇出一個最適合的中繼端來協助系統改善效能。在同頻干擾影響的環境下，我們分析並推導出系統的中斷(Outage)機率的理論數據。觀察模擬的結果，我們發現理論數據和模擬數據是貼合的，此外，若是增加來源端天線數或中繼端個數對系統效能能夠有所改善。然而，一旦目的端受到同頻干擾的功率遠大於在中繼端的條件下，對於某些情況，增加來源端天線或中繼端反而對系統效能改善是沒有任何幫助的。為了進一步分析系統，除了可使用OSTBC技術來維持系統全分集特性，若是為了使得接收信號功率對雜訊功率比值(Signal-to-Noise Power Ratio, SNR)達到最大化，在來源端，我們改採用來源端波束(Transmit Beamforming, T-BF)技術，從模擬的結果觀察到，T-BF的中斷機率在天線數大於1的情況下永遠低於OSTBC技術。然而，為了達到這樣的系統效能，需要額外付出頻繁的回授(Feedback)代價來保證能夠得到完整的通道資訊(Channel State Information, CSI)。

In this paper, we consider a two-hop multiple variable AF relaying scheme. The source node is equipped with multiple antennas and precoded by orthogonal space-time block code(OSTBC) technique to keep full diversity. Each relay and the destination nodes are equipped with single antenna and suffer from co-channel interferences(CCIs) in asymmetric channel respectively. Two main criterions, best relay selection(B-RS) and partial relay selection(P-RS), are applied to choose one proper relay among all participated relay nodes. Finally, the closed forms of outage probability of received signal are derived under this CCIs degradation environment. From the simulation results, we can show that the theoretical derivations are derived to match the simulation experiments. Besides, adding more source antenna or relay is helpful to system performance. Provided that the CCIs power at destination is much larger than at relay, for some specific cases, adding more source antenna or relay is without any help to system performance. Furthermore, instead of OSTBC, transmit beamforming (T-BF) technique is also considered at source to maximize signal-to-noise ratio(SNR) of received signal at each relay. We investigate the truth that the outage performance of T-BF always outperform OSTBC just as the number of source antenna more than one, while such assumption needs large feedback overhead to guarantee perfect channel state information(CSI).

論文審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目錄 v
圖次 vii
第一章 導論 1
1.1 研究背景 2
1.2 研究動機 4
1.3 論文架構 4
第二章 系統介紹 6
2.1 合作式通訊網路 6
2.2 傳輸媒體存取控制 7
2.3 中繼端選擇機制 10
2.3 同頻通道干擾 12
2.4 空時碼塊編碼技術 12
2.5 波束技術 13
第三章 無線通道模型 15
3.1 瑞利衰退通道模型 15
3.2 萊森衰退通道模型 16
3.3 雙散射衰落通道模型 16
3.4 非對稱衰落通道的通道機率模型 18
第四章 非對稱衰落通道下OSTBC信號和同頻干擾的效能分析 19
4.1 SINR推導與分析 19
4.2 中斷機率效能分析 22
4.2-1 基於中繼端最佳選擇方式的效能分析 23
4.2-2 基於中繼端部分選擇方式的效能分析 26
第五章 非對稱衰退通道下T-BF信號和同頻干擾的效能分析 32
5.1 SINR推導與分析 32
5.2 中斷機率效能分析 34
第六章 模擬分析與討論 36
第七章 結論 43
參考文獻 44
中英對照表 51
縮寫對照表 56

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