解碼轉遞合作式通訊正交分頻多工系統中半盲 式多重頻率偏移估測

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姓名

陳明佑(Ming-Yo Chen) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

解碼轉遞合作式通訊正交分頻多工系統中半盲式多重頻率偏移估測
(Semi-blind Multiple Frequency Offset Estimation for Decode-and-Forward OFDM Cooperative Networks)

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摘要(中)

近年來合作式通訊網路越來越受到重視，其主要原因為可達成空間分集的效果。在
解碼傳遞的合作式通訊中，由於每個中繼點的震盪器會產生頻率誤差，會導致目的端接收到訊號會有多重的頻率偏移的影響。本文提出了一個半盲式的多重頻率偏移估測演算法來解決這個問題，此方法主要為各中繼點的訓練符元使用交錯式的子通道來傳送訊號，並在接收端以MUSIC 演算法估測頻率偏移，使用此方法主要好處為可以將頻率偏移的量值區隔在不同的區間之內，因此可以簡化頻率偏移匹配的問題，同時解決以往MUSIC 演算法在頻率偏移值相近時，效果不佳的情況。電腦模擬結果中，模擬了使用正交的訓練符元，與本文提出的半盲式訓練符元配置比較，其結果證明使用半盲式的訓練符元與使用正交的訓練符元效果是一樣好的，因此使用本文所提出的演算法架構可以增進傳輸效益，同時也能減少運算的複雜度。

摘要(英)

The cooperative networks recently become attractive because it can achieve spatial diversity. Multiple decode-and-forward (DF) relay nodes result in multiple carrier frequency offsets (CFOs) because each relay node owns its local oscillator. This paper presents a novel semi-blind multiple-CFO estimator for DF OFDM co-operative network. A procedure is designed for relay nodes in order to effectively derive the semi-blind multiple-CFO estimator. Each relay node occupies it own subchannels and its CFO falls in a nonoverlapped spectrum. The CFO mapping becomes simple to match their corresponding relay nodes. In addition, the proposed method can reduce hardware and computational complexity. Semi-blind random sequences are derived by the characteristic of signal matrix in MUSIC algorithm. Comprehensive simulations show that the random sequences can replace periodic training sequences. Furthermore, some information can be conveyed by the random sequences to increase the spectral efficiency.

關鍵字(中)

★ 合作式通訊
★ 多重訊號區分演算法
★ 半盲式頻率偏移估測

關鍵字(英)

★ cooperative networks
★ MUSIC
★ semi-blind CFOs estimator

論文目次

摘要 ii
ABSTRACT iii
目錄 v
表目錄 ix
第一章緒論 1
1.1 背景 1
1.2 研究動機 1
1.3 論文大綱 2
第二章合作式通訊系統介紹 3
2.1 合作式通訊背景 3
2.2 合作式中繼技術 6
2.3 合作式中繼協定 9
第三章 OFDM 系統分析 12
3.1 正交分頻多工系統架構與訊號模型 12
3.2 頻率同步問題 13
3.3 最大相似性演算法演算法介紹 15
3.4 MUSIC 演算法介紹 17
3.5.1 MUSIC 頻率偏移估測方法 17
3.5.2 MUSIC 多重頻率偏移估測 21
第四章 OFDM 下合作式通訊系統之半盲式多重頻率偏移估測 23
4.1 前言與相關研究探討 23
4.2 系統模型 24
4.3 交錯式子載波配置 28
4.4 多重載波頻率偏移估測 30
4.5 使用半盲式的訊號推導 33
第五章程式模擬 . 39
5.1 系統參數 39
5.2 不同中繼路徑頻率偏移估測比較 40
5.3 不同調變技術比較 42
5.4 固定子通道數目下不同中繼端數量比較 45
5.5 固定中繼端數量在各種子通道之模擬 47
5.6 使用正交訓練符元與使用半盲式訓練符元比較 49
第六章結論 51
參考文獻 52

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指導教授

林嘉慶(Jia-Chin Lin)

審核日期

2013-7-1

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