MIMO-OFDM系統各天線間載波頻率偏差之探討
與收發機硬體實現

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徐莉雯(Li-Wen Hsu) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

MIMO-OFDM系統各天線間載波頻率偏差之探討與收發機硬體實現
(Design of MIMO¬-OFDM Systems with Different Carrier Frequency offsets on Transmitter Antennas )

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摘要(中)

將多輸入多輸出(Multiple Input Multiple Output, MIMO)與正交分頻多工技術(Orthogonal frequency division multiplexing, OFDM)結合已被視為下一代無線區域網路技術，此篇論文根據IEEE 802.11n WWise聯盟所提出之草案建構兩根傳送天線及兩根接收天線的MIMO-OFDM系統基頻接收機，整合了封包偵測、符元時序同步、取樣時間偏差更正、載波頻率偏移更正、通道估計，並對載波頻率偏移更正及通道估計部分特別提出新演算法及特殊情況討論，最後，以VHDL語言設計基頻收發機系統，並完成FPGA驗證。

摘要(英)

The combination of multiple-input multiple-output (MIMO) and orthogonal frequency division multiplexing (OFDM) is regarded as the next-generation wireless LAN technology. In this paper, we propose a MIMO-OFDM baseband transceiver with two transmit antennas and two receive antennas based on the WWiSE proposal. We devise a solution that integrates frame detection, symbol timing synchronization, sample timing offset synchronization, carrier frequency offset correction, and channel estimation for MIMO-OFDM transmission. With Focus on the part of carrier frequency offset correction, and channel estimation, a new algorithm is proposed in this thesis. Finally, the baseband transceiver is modeled by VHDL and designed with FPGA implementation.

關鍵字(中)

★ 載波頻率
★ 同步
★ 多輸入多輸出
★ 正交分頻多工

關鍵字(英)

★ Carrier Frequency
★ Synchronization
★ OFDM
★ MIMO

論文目次

第一章緒論…………………………………………………………………………1
1-1研究背景與動機…………………………………………………………………1
1-2章節介紹…………………………………………………………………………2
第二章簡介…………………………………………………………………………3
2-1 MIMO-OFDM簡介…………………………………………………………………3
2-2 STBC-OFDM系統簡介……………………………………………………………6
2-3 IEEE802.11n WWise……………………………………………………………8
2-4 通道模型……………………………………………………………………… 11
第三章系統模擬……………………………………………………………………12
3-1 STBC-OFDM架構介紹……………………………………………………………12
3-2取樣時序偏差更正(Sample Timing Offset Synchronization)……………13
3-3時序同步(Timing Synchronization)…………………………………………16
3-3.1 封包偵測 (Frame Detection) ……………………………………………16
3-3.2 符元時序同步 (Symbol Timing Synchronization) ……………………18
3-4 載波頻率同步(Carrier Frequency Offset Synchronization) …………19
3-4.1 各天線間載波頻率偏移相同……………………………………19
3-4.2 接收天線間載波頻率偏移不同…………………………………23
3-4.3 傳送天線間載波頻率偏移不同…………………………………24
3-5 通道估測(Channel Estimation) ……………………………………………27
3-5.1 內插法……………………………………………………………27
3-5.2 通道脈衝響應估測法(Ye,Li) …………………………………29
3-5.3 虛擬反矩陣估測法………………………………………………31
3-5.4 綜合分析比較……………………………………………………34
3-6模擬環境與結果…………………………………………………………………36
3-6.1各模組模擬結果 …………………………………………………36
3-6.2 系統整合 ……………………………………………………………………43
第四章 MIMO-OFDM收發機硬體實現 ………………………………………………46
4-1 收發機架構設計 ………………………………………………………………46
4-2 傳送端 …………………………………………………………………………49
4-2.1 架構設計…………………………………………………………49
4-2.2 STBC…………………………………………………………… 49
4-2.3 IFFT ……………………………………………………………51
4-2.4 Insert Pilot &Null,Add CP…………………………………51
4-2.5 Control…………………………………………………………52
4-3 FPGA通道………………………………………………………………………53
4-4 接收端 …………………………………………………………………………55
4-4.1 架構設計…………………………………………………………55
4-4.2 時序同步…………………………………………………………56
4-4.2.1 封包偵測 …………………………………………56
4-4.2.2 符元時序同步 ……………………………………57
4-4.3 載波頻率同步……………………………………………………58
4-4.3.1擷取模式(Acquisition Mode)……………………59
4-4.3.2追蹤模式(Tracking Mode) ………………………62
4-4.4 通道估計…………………………………………………………63
4-4.5 STBC解碼…………………………………………………………64
4-5系統整合分析與實現……………………………………………………………65
4-5.1合成圖…………………………………………………………………………66
4-5.2系統整合分析 ……………………………………………………68
4-5.3系統FPGA實現 ……………………………………………………69
第五章結論與未來展望……………………………………………………………73
參考文獻 ……………………………………………………………………………75

參考文獻

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指導教授

張大中(Dah-Chung Chang)

審核日期

2006-7-19

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