臺灣博碩士論文加值系統

超寬頻(Ultra-Wideband, UWB)系統傳輸於極寬(3.1-10.6GHz，7500MHz)的頻譜下。不可避免的將遭受同頻帶上其它現存系統的干擾，例如本文中操作於3.5GHz的IEEE 802.16 WiMAX系統將對超寬頻系統在效能上造成某種程度上的影響。有鑑於此，本論文設計一多頻帶正交分頻多工(Multi-band Orthogonal Frequency Division Multiplexing, MB-OFDM )超寬頻系統，其系統規格與架構符合ECMA-368標準。在遭受全球互通微波存取系統(Worldwide Interoperability for Microwave Access, WiMAX)的干擾下對其系統效能進行討論。另外，作者提出LMS Adaptive filter、Subcarrier Nulling、 Band Dropping 等降低干擾的方法在錯誤率上比較。

In this paper, a Multi-band Orthogonal Frequency Division Multiplexing (MB-OFDM) system for Ultra-Wideband (UWB) communication based on the ECMA-368 standard is considered. Due to IEEE 802.16 WiMAX (Worldwide Interoperability for Microwave Access) system operates at 3.5GHz band and causes the interference on the MB-OFDM UWB signal. In order to suppress the effect of the co-existing interference on MB-OFDM UWB system, the LMS adaptive filter, Subcarrier nulling, and Band dropping techniques are proposed and compared on BER in this paper.

摘要 ..................................................................................................................................I
ABSTRACT .................................................................................................................. II
目錄 .......................................................................................................................... IV
圖目錄 ............................................................................................................................ V
第一章 緒論 ................................................................................................................. 1
1.1 研究動機 ............................................................................................. 1
1.2 本文架構 ............................................................................................. 2
第二章 多頻帶正交分頻多工系統 ........................................................................... 3
2.1 超寬頻系統簡介 ................................................................................. 3
2.2 系統架構描述 ..................................................................................... 4
第三章 全球互通微波存取系統之干擾模型 ......................................................... 10
3.1 全球互通微波存取系統簡介........................................................... 10
3.2 系統架構描述 ................................................................................. 11
第四章 干擾消除技術 ............................................................................................................ 12
4.1 系統架構描述 ................................................................................... 12
4.2 最小均方適應性濾波器 ................................................................... 16
4.3 子載波指零技術 ............................................................................... 18
4.4 BAND DROPPING ............................................................................... 18
第五章 系統效能之模擬結果 .................................................................................. 19
5.1 MB-OFDM系統於WIMAX系統干擾下之系統效能 .................. 19
第六章 結論 ............................................................................................................... 24
參考文獻 ....................................................................................................................... 25


圖目錄
圖1.1 INTERFERERS SCENARIO AROUND UWB BAND GROUP 1............... 2
圖2.1 超寬頻系統之頻帶分布圖 ........................................................... 4
圖2.2 MB-OFDM使用時-頻碼跳頻圖 .................................................. 6
圖2.3 QPSK 調變星座圖對映 ............................................................... 7
圖2.4 MB-OFDM 符號包含之子載波分布圖 ...................................... 8
圖2.5 OFDM符號構造圖 ....................................................................... 9
圖3.1 WIMAX系統架構 ....................................................................... 11
圖4.1 MB-OFDM系統傳接器架構圖 ................................................. 12
圖4.2 MB-OFDM於第一個次頻帶之頻譜圖 ..................................... 13
圖4.3 MB-OFDM於第二個次頻帶之頻譜圖 ..................................... 13
圖4.4 MB-OFDM於第三個次頻帶之頻譜圖 ..................................... 14
圖4.5 WIMAX於3.5GHZ頻帶之頻譜圖 ........................................... 15
圖4.6 MB-OFDM遭受WIMAX系統干擾於頻於上之情形 ............. 15
圖4.7 LMS 適應性濾波器架構圖 ....................................................... 16
圖4.8 LMS 橫向適應性濾波器 ........................................................... 16
圖5.1 2個子載波指零技術於頻譜上的情形 ...................................... 20
圖5.2 比較使用LMS 適應性濾波器前後於時域上的結果 .............. 20
圖5.3 比較使用LMS 適應性濾波器前後於頻域上表現情形 .......... 20
圖5.4 LMS適應性濾波器收斂情形 .................................................... 21
圖5.5 LMS適應性濾波器收斂後殘餘的干擾信號 ............................ 21
圖5.6 MB-OFDM 遭受下干擾加上干擾消除技術後之性能表現 .... 23

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