基於短循環字首長度下利用領航訊號在 DVB-T2 的頻譜檢測

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姓名

王昕民(Simy Wang) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

基於短循環字首長度下利用領航訊號在 DVB-T2 的頻譜檢測
(Spectrum Sensing Based on Pilots for Short Cyclic Prefix Length in DVB-T2)

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摘要(中)

在現代的無線通訊中，正交分頻多工系統 (Orthogonal Frequency-Division Multiplexing, OFDM) 已經被廣泛使用於各種裝置中-例如數位電視廣播系統。在這種情況下，當然也就產生了一些問題，其中就是頻帶使用效率的部分-如何去提高頻帶的使用效率是一大問題。為此科學家提出了感知無線電的理論(Cognitive Radio)來改善這些問題。感知無線電主要可分為頻譜檢測(Spectrum Sensing)、電源控制(Power Control)、頻帶分配(Spectrum Management) 三大部分。本篇論文主要屬於頻譜檢測的部分，並著重在第二代數位電視廣播系統 (DVB-T2) 上。藉由分析其特殊的領航訊號特性，來檢測其頻譜。

摘要(英)

In modern wireless communications, Orthogonal Frequency-Division Multiplexing is widely used in a variety of systems such as digital video broadcasting. It turns out that the problem of how to improve the spectrum efficiency is mentioned for real applications. To solve this problem, the cognitive radio schemes are rapidly increasing in the literature. There are three main categories in cognitive radio: spectrum sensing, power control, and spectrum management. This paper studies the spectrum sensing method for DVB-T2 based on pilots to be used with a short cyclic prefix length. The DVB-T2 spectrum is sensed through the specific pilot patterns that are designed in DVB-T2.

關鍵字(中)

★ 頻譜檢測
★ 感知無線電
★ 數位電視廣播系統

關鍵字(英)

★ spectrum sensing
★ cognitive radio
★ DVB-T2

論文目次

目錄
中文摘要 ………………………………………………………… i
英文摘要 ………………………………………………………… ii
目錄 ………………………………………………………… i
圖目錄 ………………………………………………………… ii
表目錄 ………………………………………………………… iii
第 1 章序論 ………………………………………………………… 1
1.1 前言 ………………………………………………………… 1
1.2 章節架構 ………………………………………………………… 4
第 2 章DVB-T2 系統架構 ………………………………………………………… 5
2.1 DVB-T2 系統簡介 ………………………………………………………… 5
2.2 碼框結構及傳輸訊號 ………………………………………………………… 6
2.2.1 碼框結構 ………………………………………………………… 7
2.2.2 傳輸訊號 ………………………………………………………… 7
2.3 參考訊號 ………………………………………………………… 10
2.3.1 連續領航訊號 ………………………………………………………… 12
2.3.2 散射領航訊號 ………………………………………………………… 13
第 3 章頻譜檢測的演算法 ………………………………………………………… 15
3.1 基於循環字首的頻譜檢測演算法 ………………………………………………………… 16
3.2 基於領航訊號的頻譜檢測演算法 ………………………………………………………… 17
3.2.1 時域符元交相關法 ………………………………………………………… 17
3.2.2 能量累積時域符元交相關法 ………………………………………………………… 20
3.2.3 修正型能量累積時域符元交相關法 ……………
…………………………………………… 21
3.3 決策原理與機率分析 ………………………………………………………… 22
3.3.1 循環字首法 ………………………………………………………… 23
3.3.2 能量累積時域符元交相關法 ………………………………………………………… 25
3.3.3 修正型能量累積時域符元交相關法 ……………
…………………………………………… 27
3.4 所提出的方法在 DVB-T 上的分析與比較 ………………………………………………………… 29
3.5 頻譜檢測的演算法的總結 ………………………………………………………… 35
第 4 章系統模擬與結果分析 ………………………………………………………… 36
4.1 系統模擬參數 ………………………………………………………… 36
4.2 模擬結果與討論 ………………………………………………………… 38
4.2.1 在雜訊不確定性情況下其 PFA 與 PM 的變化 ……………
…………………………………………… 39
4.2.2 不同訊雜比下 PFA 與 PD 的收斂曲線 ……………
…………………………………………… 41
4.2.3 散射領航訊號型態為 PP2 的情況下 ……………
…………………………………………… 42
4.2.4 散射領航訊號型態為 PP4 的情況下 ……………
…………………………………………… 45
4.2.5 散射領航訊號型態為 PP6 的情況下 ……………
…………………………………………… 51
4.2.6 散射領航訊號型態為 PP7 的情況下 ……………
…………………………………………… 52
第 5 章結論 ………………………………………………………… 54
參考文獻 ………………………………………………………… 57

參考文獻

參考文獻
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指導教授

張大中(Dah-Chung Chang)

審核日期

2013-10-7

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