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研究生:王玫玲
研究生(外文):Mei-Ling Wang
論文名稱:以垂直正交分頻分碼多工調變為基礎之下鏈接收機架構之設計
論文名稱(外文):A Study on Downlink Receiver Design for OFDM/CDMA-based Mobile Communication System
指導教授:黃家齊黃家齊引用關係
指導教授(外文):Chia-Chi Huang
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電信工程系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:103
中文關鍵詞:分頻分碼多工調變垂直正交
外文關鍵詞:OFDM/CDMAOFDM-CDMAMC-CDMACDMA/OFDMOFDMCDMA
相關次數:
  • 被引用被引用:2
  • 點閱點閱:227
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  • 下載下載:46
  • 收藏至我的研究室書目清單書目收藏:0
下一代的蜂巢式行動通訊系統必須提供高速資訊傳輸之無線網路應用。而最可能使用之無線多重進階方式為OFDM/CDMA。這篇論文將介紹OFDM/CDMA下鏈接收機之基頻架構設計以期達到高資料傳輸速率之要求並探討OFDM/CDMA系統效能。這套系統除了具有基頻訊號偵測功能,還包含以領航訊號(pilot signal)來實現通道估計之功能。訊號偵測的部分需要設計一個通道等化器與決策器。其中通道等化器主要有最大比例合併等化器(Maximum ratio combination)、強制歸零等化器(Zero forcing)、部份等化器(Partial equalizer)、最小均方差等化器(MMSE)與相同增益合併等化器(Equal gain combination)等五種。本論文將研究各種等化器之效能以應用在下鏈接收機之架構。在通道估計方面我們是使用一已知的領航訊號,利用FFT匹配濾波器(FFT Match filter)觀念與移動平均的技術來完成。本論文另外會再比較OFDM/CDMA下鏈接收機與CDMA下鏈接收機之異同並以電腦模擬此二系統在數種通道下的效能。

The next generation cellular mobile communication system will provide high data rate for internet service. One of the most promising multiple access methods in the next generation system is the OFDM/CDMA. This thesis proposes an OFDM/CDMA downlink baseband receiver architecture for high data rate transmission and discusses the system performance. This receiver architecture includes a baseband signal detection and a channel estimation. We use a pilot signal to estimate the channel. For signal detection, we design a channel equalizer and a signal decision method. The channel equalizer has five methods: Maximum ration combining, Zero forcing, Partial equalizer, MMSE(Minimum mean square error) and Equal gain combining. The performances of these five kinds of channel matching methods are shown in the thesis. Furthermore, we use a pilot signal with FFT based matched filters and moving average unit to estimate channel response.
We also compare the OFDM/CDMA downlink baseband receiver architecture with a CDMA downlink baseband receiver architecture. The performance of the systems are simulated by computer under several channel models.

第一章、簡介
第二章、OFDM簡介
2.1 OFDM系統的演進
2.1.1傳統的OFDM架構
2.1.2 基於DFT的OFDM
2.2 OFDM 的特性
2.2.1 正交性
2.2.2 護衛間隔之插入
2.2.3 OFDM的優缺點
第三章、展頻系統
3.1 展頻系統簡介
3.1.1 展頻系統特性 3.1.2 三種展頻碼
3.1.2.1 m-序列 3.1.2.2金氏碼
3.1.2.3華氏碼
3.2三種展頻系統介紹
3.2.1 跳頻式展頻
3.2.2 跳時式展頻
3.2.3直接序列展頻
3.3三種基於OFDM之多重進接方式
3.3.1多載波分碼多重進接
3.3.2多載波直接序列分碼多重進接
3.3.3多調分碼多重進接
第四章、多載波分碼多重進接
4.1傳送端
4.1.1傳送端架構
4.1.2資料展頻和攪亂
4.2接收端
4.2.1接收機架構
4.2.2通道估計
4.2.3領航訊號消除
4.2.4五種通道匹配方式
4.3多符元傳送端
4.3.1 傳送端架構
4.3.2資料展頻、攪亂與交錯
4.4多符元接收端
4.4.1接收機架構
4.4.2資料解展頻、解攪亂與解交錯
4.5 系統模擬
4.5.1通道模型
4.5.2模擬結果與討論
4.5.2.1雙路徑AWGN通道
4.5.2.2雙路徑衰減通道
第五章、CDMA與MC-CDMA的比較
5.1 CDMA之傳送與接收架構
5.1.1 CDMA傳送端架構
5.1.2 CDMA接收端 5.1.2.1接收機架構
5.1.2.2資料解展頻
5.1.2.3四種通道匹配方式
5.2 二者系統之參數設定
5.3 模擬結果與討論
5.3.1雙路徑AWGN通道
5.3.2雙路徑衰減通道
第六章、結論與未來發展

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