在這篇論文中，我們探討多用戶(Multi-User)速龍編碼(Raptor-Coded)非同調(Noncoherent)分散式(Distributed)么正空時調變(Unitary Space-Time Modulation, USTM)的方案，其中考慮一個動態解碼後前送(Decode-and-Forward, DF)合作式通訊(Cooperativr Communication)場景。在分散式非同調么正空時調變中傳送端及接收端不需要知道通道狀態信息(Channel State Information, CSI)。速龍碼是一個無速率(Rateless)碼，可以適應快速變化的通道環境，並且具有可變碼率的特性。在分散式中繼(Relay)網路架構下我們使用非同調最大事後機率(Maximum a Posteriori, MAP)偵測器結合速龍碼能有效降低位元錯誤率(Bit Error Rate, BER)。合作式通訊系統中，多中繼端節點能產生空間多樣性，增強資料的傳輸品質。因此我們提出多用戶合作式傳輸方案，包含正交多址(Orthogonal Multiple Access, OMA)與非正交多址(Non-Orthogonal Multiple Access, NOMA)協助多用戶在合作式網路中運作。在中繼端節點提出多用戶調變使接收端透過用戶更正資訊來提升整體效能。模擬結果顯示我們提出的多用戶非正交多址技術以及多用戶訊息交換方法能有效降低BER以及改善吞吐量的性能。

In this paper, we investigate multiuser Raptor-coded non-coherent distributed unitary space-time modulation (USTM) scheme, where consider a dynamic decode-and-forward(DF) cooperative communication scenario. In the distributed non-coherent unitary space-time modulation, the transmitter and receiver do not need to know the channel state information. Raptor code is a rate-less code that can adapt to rapidly changing channel environment, and has the characteristics of variable code-rate. In the distributed Relay network architecture, we use the non-coherent maximum a posterior probability detector combined with the Raptor code can effectively reduce the bit error rate(BER). In cooperative communication systems, multiple relay nods can produce spatial diversity and enhance the quality of data transmission. Therefore, we propose a multiuser cooperative transmission scheme that includes Orthogonal Multiple Access and Non-Orthogonal Multiple Access to assist multiple users in a cooperative network. At the relay node, multi-user modulation is proposed to improve the overall performance of the receiver through user correction of information. Simulation results show that our proposed multi-user non-orthogonal multi-access technology and multi-user message exchange method can effectively reduce the BER and improve the throughput performance.

論文審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 viii
第一章 導論 1
1.1 前言 1
1.2 研究動機 2
1.3 論文架構 3
第二章 系統模型 4
2.1 合作式通訊網路 4
2.2 么正空時調變 6
2.2.1 么正空時調變的架構設計 7
2.2.2 生成矩陣與基底矩陣的選擇方法 8
2.2.3 最大似然解碼器 9
2.2.4 迭代偵測和解碼 10
2.3 噴泉碼 11
2.3.1 盧比轉換碼 11
2.3.2 速龍碼 14
第三章 來源端到中繼端的多輸入多輸出系統 17
3.1 通道模型 17
3.2 正交多址傳送方式 18
3.3 非正交多址傳送方式 19
3.3.1 設計的非正交么正空時調變 20
第四章 中繼端到目的端的多輸入單輸出系統 23
4.1 一般調變 23
4.2 多用戶調變 25
第五章 實驗結果與討論 27
5.1 ML偵測器模擬 28
5.2 MAP偵測器模擬 29
5.3 吞吐量模擬 32
第六章 結論 34
參考文獻 35
中英對照表 38
全名縮寫對照表 44

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