3GPP長程演進通訊系統蜂巢搜尋

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姓名

曹伯仲(Bo-Jhong Tsao) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

3GPP長程演進通訊系統蜂巢搜尋
(Cell Search for 3GPP LTE Communication System)

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摘要(中)

LTE（long term evolution）無線通訊系統下行採用OFDMA 系統，在此系統中使用了主要同步訊號(primary synchronization signal)與次要同步訊號(secondary synchronization signal)來處理同步與蜂巢確認的問題。然而，OFDM/ OFDMA 系統對於時間和頻率的同步誤差很敏感。此外，當用戶設備（user equipment）在蜂巢系統(cellular system)下運作，由於LTE 的蜂巢身份(cell-ID)有504 個，因此它需要快速的與所服務的基地台建立連接，且要確定所工作的區段(sector)與蜂巢身份(cell-ID)。本篇論文提出三個步驟：第一步，使用延遲自相關找出訊框時序(frame timing)與主要同步訊號，再以此時序開始做小數點時間與頻率估測，在小數點頻率估測中我們利用帄均法來改善小數點頻率的準確度。第二步，我們利用訊號相位差的方式以同步訊號來偵測區段與整數頻率偏移，實驗結果顯示可以有效抵抗通道效應與符號時序的誤差。第三步，蜂巢身份確認。此研究所提出的演算法，是利用相位差的方式來確認區段與蜂巢身份，此方法可以有效的抵抗通道效應，且與匹配濾波器法比較，此演算法能有較高的穩定度。

摘要(英)

LTE（long term evolution）wireless communication downlink system uses OFDMA. This system uses the primary synchronization signal (P-SCH) and the secondary synchronization signal(S-SCH) for synchronization and cell identities solving problems. However, it is well known that OFDM systems are sensitive to time and frequency synchronization error. Hence we require accurate synchronization techniques. Furthermore, user equipment (UE) operates in a cellular system, and there are 504 cell-ID in LTE, it needs to establish connection as fast as possible with the best serving base station, i.e. to identify the operating sector and cell. The proposed cell search procedure in this paper contains three steps: The first step, using the delay auto-correlation to find frame timing and the primary synchronization signal, and then use this sequence to start estimate the symbol timing and fractional frequency. And in the estimation we use the average method to improve the accuracy of fractional frequency. The second step, we use method of the phase difference between each signal with synchronization to confirm sector and the integer frequency. And the outcome shows that it can effectively withstand the error of channel effect and symbol timing. The third step, confirm cell-ID.
The proposed algorithm confirms the sector and cell ID by phase difference, it can resist the channel effect, and it is more stabilize than matched filter.

關鍵字(中)

★ 同步
★ 蜂巢搜尋
★ 相位差分
★ 匹配濾波器

關鍵字(英)

★ synchronization
★ cell search
★ phase difference
★ matched filter

論文目次

目錄.....................................................iv
圖目錄...................................................vi
表目錄...................................................ix
第一章緒論...............................................1
1.1簡介...................................................1
1.2研究動機...............................................2
第二章 Long Term Evolution系統介紹........................4
2.1 單載波分頻多工存取介紹................................4
2.2 正交分頻多工存技術....................................7
2.2.1 保護區間與循環前置對ISI與ICI的影響..................9
2.2.2 正交分頻多工存取技術...............................15
2.3 Long Term Evolution訊框系統..........................17
2.3.1 訊框資料型態.......................................18
2.3.2 主要同步訊號與次要同步訊號.........................21
第三章蜂巢搜尋流程與演算法..............................30
3.1 訊框時序估測.........................................32
3.2 以平均法改良ML小數點頻率之效能.......................34
3.3 區段與整數頻率偏移估測...............................37
3.4 蜂巢身份辨識.........................................39
第四章瑞雷多重路徑衰落通道環境下的蜂巢辨識與演算法......42
4.1 瑞雷多重路徑衰弱通道對訊框時序的影響.................42
4.2 ML平均法在瑞雷多重路徑衰弱通道之效能.................44
4.3 差分方法檢測區段與整數頻率偏移估測...................47
4.3.1 實驗討論...........................................47
4.3.2 ML平均法對整數頻率偏移估測的影響...................53
4.4 差分方法檢測蜂巢身份.................................56
4.4.1 同調檢測與非同調檢測...............................56
4.4.2 實驗結果...........................................57
第五章結論與未來發展....................................61
參考文獻.................................................62
附錄通道模型............................................65
A.1 衰落效應.............................................65
A.1.1 大範圍衰落與小範圍衰落.............................65
A.1.2 多路徑效應與都卜勒偏移.............................67
A.1.3 平坦衰落...........................................69
A.1.4 頻率選擇性衰落.....................................70
A.1.5 快速衰落...........................................70
A.1.6 緩慢衰落...........................................71
A.2 Jakes衰落通道模型....................................72
A.3 同步問題.............................................77

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指導教授

林嘉慶(Jia-Chin Lin)

審核日期

2010-7-6

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