使用MMSE等化器的Filterbank OFDM系統探討

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姓名

李達龍(Da-Long Lee) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

使用MMSE等化器的Filterbank OFDM系統探討
(The Investigation of Filterbank OFDM Systems with MMSE Equalization)

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摘要(中)

在本篇論文中將討論使用filterbank的多載波系統應用於無線室內的環境中。使用filterbank取代DFT做為OFDM系統的主要目的為其較佳的頻譜特性，能夠降低interchannel interference (ICI)，甚至可以省去CP，增加OFDM傳輸效率。我們首先討論filterbank設計參數的選定; 接著提出三種具MMSE等化器的接收機架構，並對這三種等化器組態的特性做探討及比較。此外，將使用MMSE等化器的Filterbank OFDM系統，和現行的IEEE 802.11a系統做比較。整個模擬環境設定參考 IEEE 802.11a 之 OFDM 系統規格設計，採用 64點 FFT 系統之次頻帶。雜訊源和通道考慮 AWGN 和 Multipath Fading，另外我們將考慮 narrowband interference 之影響。結果顯示了Filterbank-based 多載波通訊系統具有較為優越的傳輸性能，但須付出較高複雜度和較長之訓練序列。

摘要(英)

In this thesis we investigate the use of the filterbank-based multicarrier communication system in the indoor environment. The filterbank-based system as opposed to DFT OFDM, is that the property of low sidelobe in filterbank can reduce intercarrier interference which is typically serious for some situations in OFDM. First, the choice of the filterbank design parameters is discussed. The receiver characteristics of different equalization structures are studied, and their complexity and performance are compared as well. Finally, the IEEE 802.11a OFDM system is compared with the filterbank-based multicarrier proposal. A quasi-static channel is used and the noise considers narrowband interference and AWGN. The results show that the performance of filterbank-based system is superior to the IEEE 802.11a OFDM system with the penalty of complexity and longer training sequence.

關鍵字(中)

★ IEEE 802.11a
★ 多載波調變
★ MMSE 等化器
★ 正交分頻多工系統
★ 濾波器組

關鍵字(英)

★ multicarrier modulation
★ MMSE equalization
★ OFDM
★ Filterbank
★ IEEE 802.11a

論文目次

第一章　研究動機 1
第二章　Filterbank的參數選擇 2
2.1 Filterbank Multicarrier(FB-MC)簡介 2
2.1.1 Transmultiplexer 2
2.1.2 Cosine-Modulated Filter Banks 4
2.1.3 Prototype Filter 5
2.2 Stopband attenuation和transition bandwidth之影響 6
2.2.1 Stopband attenuation之影響 6
2.2.2 Transition bandwidth之影響 9
2.3 設計參數的選擇 11
2.3.1 K的選擇 11
2.3.2 AWGN下roll-off factor的選擇 12
2.4結論 13
第三章　Filterbank OFDM之等化 14
3.1 Noble identity的定義 14
3.2 MMSE等化器 15
3.2.1 後置等化器 15
3.2.2 MIMO等化器 18
3.2.3 前置等化器 21
3.2.4 具適應性重建濾波器組之等化器 24
3.3等化器組態之特性 27
3.3.1 MIMO等化器 27
3.3.2 前置等化器 27
3.3.3 具適應性重建濾波器組等化器 28
3.4等化器組態間之比較 30
3.4.1 重建性能和複雜度比較 30
3.4.2 相同重建性能下之比較 32
3.5等化器對Filterbank之影響 34
3.6 結論 36
第四章　Filterbank OFDM系統和IEEE 802.11a 系統之比較及應用 37
4.1 DFT OFDM系統簡介 37
4.1.1 DFT OFDM系統 37
4.1.2 Channel Estimation 39
4.1.3 Window Operation 41
4.2 模擬環境設定 46
4.2.1 通道模型 46
4.2.2 雜訊模型 48
4.3比較具MMSE等化器Filterbank OFDM系統和IEEE 802.11a OFDM 49
4.4應用具適應性重建濾波器組之接收機取代IEEE 802.11a 接收機 56
4.5 簡化具適應性重建濾波器組接收機架構之可行性60
4.6 結論 61
第五章綜合結論 62
參考文獻 63

參考文獻

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指導教授

張大中(Dah-Chung Chang)

審核日期

2004-10-13

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