無線區域網路之MIMO-OFDM系統設計與電路實現

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姓名

彭容彥(Jung-Yen Peng) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

無線區域網路之MIMO-OFDM系統設計與電路實現
(Design and Implementation of a MIMO-OFDM System for WLANs)

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摘要(中)

近年來無線區域網路系統因對於提高資料速率以及降低錯誤率之需求，MIMO-OFDM已成為下一代無線區域網路之技術。本論文根據World Wide Spectrum Efficiency (簡稱WWiSE）聯盟提出之下一代無線區域網路標準 IEEE 802.11n提案，模擬一2X2 MIMO-OFDM系統，並以VHDL設計其硬體架構。
在本論文中，系統採用STBC編碼，包含封包偵測、符元時序同步、載波頻率同步、以及通道估測等模組，將先分別介紹其各模組之演算法並探討其效能，而最後整體系統經由電腦模擬結果顯示，所提出之MIMO-OFDM系統相較於傳統之IEEE 802.11a系統，在室內多通道路徑下性能將有顯著之提升。

摘要(英)

Because of the demand of higher transmission data rate and better transmission quality, the MIMO-OFDM technology is the trend of the next-generation WLANs. In the thesis, we design a MIMO-OFDM baseband transceiver with two transmit antennas and two receive antennas based on the WWiSE（World Wide Spectrum Efficiency）Alliance’s IEEE 802.11n proposal. Then the architecture is implemented by VHDL.
In this thesis, an STBC-OFDM system is described, including the functions of frame detection, symbol timing synchronization, carrier frequency synchronization, and channel estimation. First, each block is discussed individually and the performance is analyzed. Finally, from the system-level simulation results, we show that the proposed MIMO-OFDM receiver offers better performance than the IEEE 802.11a system in an indoor multipath channel.

關鍵字(中)

★ 無線區域網路
★ 通道估測
★ 多輸入多輸出正交分頻多工系統
★ 時空方塊碼
★ 同步

關鍵字(英)

★ WWiSE.
★ MIMO-OFDM
★ STBC
★ Synchronization
★ IEEE 802.11n
★ WLANs
★ Channel Estimation

論文目次

1. 緒論1
1.1 研究背景與動機1
1.2 章節架構2
2. 多輸入多輸出正交分頻多工系統(MIMO OFDM)簡介3
2.1正交分頻多工系統(OFDM)介紹3
2.2多輸入多輸出系統介紹5
2.3. STBC -OFDM介紹10
2.4. WWise1 2
2.5無線通道模型15
3. MIMO-OFDM收發機架構及系統模擬16
3.1 系統架構16
3.2 同步(synchronization)20
3.2.1 封包偵測20
3.2.2 時序同步22
3.2.3.載波頻率同步26
3.3. 通道估測(Channel Estimation)37
3.3.1通道估測演算法37
3.4 相位誤差對STBC-OFDM系統之影響43
3.5 系統模擬45
4. MIMO-OFDM收發機之電路設計48
4.1 模擬環境及平台48
4.2 同步(synchronization)49
4.2.1 封包偵測(Packet Detection)硬體架構49
4.2.2 時序同步硬體架構52
4.2.3 載波頻率同步硬體架構54
4.3 通道估測(Channel Estimation) 硬體架構56
5. 結論與未來工作 59
參考文獻60

參考文獻

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指導教授

張大中(Dah-Chung Chang)

審核日期

2005-7-20

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