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研究生中文姓名:徐永霖
研究生英文姓名:Shu, Yung-Lin
中文論文名稱:3GPP LTE-A系統下鏈通訊同步、基地臺辨別與通道估測之研究
英文論文名稱:Synchronization, Cell Identification and Channel Estimation Schemes in LTE-A System Downlink
指導教授姓名:李啟民
口試委員中文姓名:教授︰林丁丙
副教授︰李啟民
助理教授︰吳家琪
教授︰湯譯增
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:通訊與導航工程學系
學號:10267004
請選擇論文與海洋研究相關度:無相關
請選擇論文為:學術型
畢業年度:104
畢業學年度:103
學期:
語文別:英文
論文頁數:83
中文關鍵詞:3GPP LTE-AOFDM同步時間位移(TO)載波頻率偏移(CFO)小數載波頻率偏移(FCFO)整數載波頻率偏移(ICFO)時域發散通道通道估測
英文關鍵字:3GPP LTE-AOFDMSynchronizationTime Offset (TO)Carrier Frequency Offset (CFO)Fractional Carrier Frequency Offset (FCFO)Integer Carrier Frequency Offset (ICFO)Time-dispersive ChannelChannel Estimation
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本篇論文主要討論在多路徑通道環境下同步、細胞鑑別與通道估測的議題。同步主要分為時間同步與頻率同步。時間同步主要是估測時間位移(Time Offset, TO)量,而頻率同步則是估測載波頻率飄移(Carrier Frequency Offset, CFO)量,其中又分為整數頻率偏移(Integer Carrier Frequency Offset, ICFO)與小數頻率偏移(Fractional Carrier Frequency Offset, FCFO)。在 LTE-A系統上訂定了兩個同步訊號來做估測,分別是主要同步訊號(Primary Synchronization Signal, PSS)與次要同步訊號(Secondary Synchronization Signal, SSS)。本論文所提出的方法主要是利用主要同步訊號(PSS)的訊號特性來執行時間與細胞鑑別(Cell-ID Identification)之估測。而在 3GPP LTE-A下鏈傳輸的規格中,基地臺的分群辨識碼是由兩個參數組成的,分別是分區細胞所引(Cell-ID2)和分群細胞所引(Cell-ID1)。分區細胞所引(Cell-ID2)參數位於主要同步訊號內,而次要同步訊號內則包含了分區細胞所引和分群細胞所引。在多路徑通道環境下,多項訊號特性都會被破壞,本篇論文提出的方法致力於減輕和消除通道對於接收訊號的影響,最後再將通道響應估測出來。與傳統的方法比較,提出的方法不論在執行結果及計算複雜度上都有出色的表現。
This thesis focuses on the LTE-A system synchronization, cell identification (cell-ID) and channel estimation in the time-dispersive multipath channel environment. Synchronization can be grouped into two parts, one part is time offset (TO) and the other is carrier frequency offset (CFO). When it comes to CFO, it is separated into two parts: integer carrier frequency offset (ICFO) and fractional carrier frequency offset (FCFO). In LTE-A , there are two synchronization signals can be utilized to detect TO and CFO - Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS). The cell-ID consists of Cell-ID1 and Cell-ID2. The information of Cell-ID2 is within the PSS, and both Cell-ID1 and Cell-ID2 information are contained in SSS. The proposed schemes in this thesis use PSS properties to detect TO, FCFO, joint detection cell-ID2 and ICFO and channel response. In the multipath channel, lots of PSS symmetric property will be destroyed. The new proposed schemes dedicate to reduce and ease the channel effect, and finally estimate the channel response. Compared with the conventional detection schemes, the proposed schemes have better performance and lower computational complexity advantage in time-dispersive channel scenarios.
Chapter1 Introduction 1
1.1 Motivation 1
1.2 Thesis Overview 2
Chapter2 Overview of the 3GPP LTE-A System 3
2.1 LTE-A Background 3
2.2 OFDM System 3
2.3 Timing Offset and Carrier Frequency Offset 5
2.3.1 Timing Offset (TO) 5
2.3.2 Carrier Frequency Offset (CFO) 5
2.4 The Transmitter and Receiver of OFDM System 6
2.5 LTE-A Transmission Resource Structure 7
2.6 OFDM Baseband Signal Generation 11
2.7 Synchronization Signal of 3GPP LTE-A 12
2.7.1 Primary Synchronization Signal (PSS) 14
2.7.2 Secondary Synchronization Signal (SSS) 16
Chapter3 Conventional Synchronization Schemes 23
3.1 Synchronization in Time and Frequency Domain 23
3.2 Literature Time Offset Detecting Schemes 24
3.2.1 Literature TO Detecting Scheme#1[13] 24
3.2.2 Literature TO Detecting Scheme#2[6] 26
3.3 Literature FCFO Detecting Scheme [2] 28
3.4 Literature joint ICFO and Cell-ID2 detecting scheme 29
3.4.1 Literature joint ICFO and Cell-ID2 detecting scheme#1[16] 29
3.4.2 Literature joint ICFO and Cell-ID2 detecting scheme#2[10] 32
3.4.3 Literature joint ICFO and Cell-ID2 detecting scheme#3[12] 32
Chapter4 Novel Proposed Schemes 34
4.1 Time Offset Effect 35
4.2 Multipath Channel Effect 38
4.3 Effect of the Integer Carrier Frequency Offset 40
4.4 Proposed TO Detection Scheme 41
4.4.1 Coarse TO Detection 42
4.4.2 Fine TO Detection 44
4.5 Proposed FCFO detection Scheme 47
4.6 Proposed Joint Cell-ID2 and ICFO detection Scheme 48
4.6.1 Cell-ID2 detection 49
4.6.2 ICFO detection 51
4.7 Proposed Channel Estimation Scheme 52
4.7.1 Proposed Channel Estimation Scheme 54
4.7.2 Enhanced Proposed Channel Estimation Scheme 55
Chapter5 Simulation Results 58
5.1 TO Detection Simulation 60
5.1.1 Novel TO Detection Scheme Simulation 60
5.1.2 TO Detection Comparisons 64
5.2 FCFO Detection Simulation 67
5.3 Joint ICFO and Cell-ID2 Detection Simulation 68
5.3.1 Proposed Scheme Simulation 68
5.3.2 ICFO and Cell-ID2 joint detection Schemes Comparison 70
5.4 Channel Estimation Simulation 75
Chapter6 Conclusions 80
6.1 Conclusions 80
6.2 Future Work 81
References 82
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全文檔開放日期:2015/06/29
 
 
 
 
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