向上鏈結正交分頻多重接取系統之載波頻率偏移估測

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郭勝中(Sheng-Chung Kuo) 查詢紙本館藏

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通訊工程學系

論文名稱

向上鏈結正交分頻多重接取系統之載波頻率偏移估測
(Carrier Frequency Offset Estimation for OFDMA Uplink)

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摘要(中)

在向上鍵結正交分頻多重接取系統中，載波頻率偏移將會引進載波間干擾(ICI)和多重存取干擾(MAI)，將會降低系統效能。盲目載波估計演算法中以[1]所提出的多重信號特徵(MUSIC)受到相當關注，但這個演算法在硬體時作上有兩個高複雜度的運算須克服，分別是雜訊子空間的獲得及依解析度大量蒐尋估測參數，此外在無線傳輸單位是一個偵框，而通道和在波頻率偏移應該是隨著每一個符元變化，在每一個符元時間下做一次估計是沒有效率的，在此篇論文之中，我們引用了快速資料投影法(FDPM)來獲得雜訊子空間，並設計了一個迭代多重信號特徵演算法以快速完成一個偵框長度的載波頻率偏移的估測。

摘要(英)

In OFDMA uplink systems, carrier frequency offset (CFO) would cause inter carrier interference (ICI) and multiple access interference (MAI), and would degrade the system performance. Blind CFO estimation algorithms have been proposed in lot of papers, and [1] proposed the MUSIC algorithm with excellent performance, but the MUSIC algorithm includes two operation that are hard for hardware to implement, to acquire the noise subspace and grid search procedure that depends on search resolution, besides, the wireless communication system transmission unit is frame, but the channel and CFO will change along the symbols, so if we estimate the CFO per symbol isn’t efficiency, so in this paper, we applied a fast data projection method (FDPM) to get the noise subspace and proposed a iterative MUSIC scheme to estimate the CFO over frame rapidly.

關鍵字(中)

★ 正交分頻多重接取系統
★ 載波頻率偏移

關鍵字(英)

★ OFDMA
★ MUSIC
★ CFO
★ Iterative Scheme

論文目次

論文摘要 I
Abstract II
致謝 III
Contents IV
List of Tables VI
Chapter 1 Introduction 1
Chapter 2 System Model 6
2.1 Interleaved Subcarrier Assignment Scheme 6
2.2 Transmitter 7
2.3 Wireless Channel 9
2.4 Receiver 10
Chapter 3 12
BLIND CFO ESTIMATION ALGORITHM 12
3.1 Blind Parameter Estimation by MUSIC 12
3.2 Subspace Tracking Algorithm 14
3.3 Iterative Method 17
3.4 Proposed Iterative Estimation Scheme 19
3.5 Analysis 23
Chapter 4 Simulation Results 25
4.1 Simulation Models for OFDMA Uplink 25
4.2 Simulation Results 28
Chapter 5 Conclusions 32
Reference 33

參考文獻

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指導教授

陳永芳(Yung-Fang Chen)

審核日期

2010-7-22

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