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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 鐘嘉德(Char-Dir Chung) | |
| dc.contributor.author | Chieh-Ju Tsai | en |
| dc.contributor.author | 蔡杰儒 | zh_TW |
| dc.date.accessioned | 2021-06-08T02:46:04Z | - |
| dc.date.copyright | 2021-02-22 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-07-22 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/20354 | - |
| dc.description.abstract | 在現行的正交分頻多工(OFDM)系統和標準，對於時間和頻率的初始同步大多使用前導訊號波形，因此如何正確地偵測前導訊號序列是十分重要的議題。在現有的文獻中，通常使用自相關方法(autocorrelation method)或互相關方法(crosscorrelation method)進行前導訊號序列的偵測，然而這些方法對於通道的變化是敏感的。 在這篇論文中，基於廣義概似比檢驗(GLRT)和尼曼皮爾森(Neyman Pearson)標準，新的前導訊號偵測方法被提出，這些方法在前導訊號偵測的效果對於通道變化十分不敏感，能夠在未知的通道環境中提供強大的表現。 | zh_TW |
| dc.description.abstract | In practical orthogonal frequency division multiplexing systems and standards, preamble waveforms are adopted to facilitate initial timing and frequency synchronization. Therefore, how to detect preamble sequences correctly is a crucial issue. In the literature, autocorrelation method and crosscorrelation method are commonly used to detect preamble sequences. However, both of the two methods are sensitive to the channels which preamble is transmitted in. In this thesis, the new preamble detection methods based on the generalized likelihood ratio test (GLRT) principle and the Neyman Pearson (NP) criterion are proposed. These preamble detection methods are not sensitive to channels, and they can provide a robust performance even if channel is unknown. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-08T02:46:04Z (GMT). No. of bitstreams: 1 U0001-1707202016582100.pdf: 2869935 bytes, checksum: 61c7c6a978faacc8b61a852995b2ad53 (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 中文摘要 i Abstract ii Contents iii List of Figures v List of Tables viii 1 Introduction 1 1.1 Overview of OFDM Systems 1 1.2 Review of Properties of Preamble Waveforms 2 1.3 Review of Sequence Detection 4 1.4 Thesis Motivation 5 1.5 Notations 5 2 Signal Model and MGLRT Method 7 2.1 Signal Model 7 2.1.1 Transmitter Signal Model 7 2.1.2 Receiver Signal Model 9 2.2 Maximum GLRT Method 10 2.2.1 GLRT Estimation 10 2.2.2 Decision Method 12 2.3 Detection Error Probability 13 2.4 Performance Analysis 16 2.4.1 Compared Sequences 17 2.4.2 Numerical and Simulation Result 18 3 IGLRT Method 34 3.1 Iterative GLRT Method 34 3.2 Detection Error Probability 35 3.3 Performance Analysis 38 3.3.1 Complexity Comparison 39 3.3.2 Numerical and Simulation Result 39 4 Conclusion 45 Bibliography 46 Appendix A: Derivation of (2.12) 52 Appendix B: Derivation of (2.13) 53 | |
| dc.language.iso | en | |
| dc.title | OFDM系統中的前導序列偵測 | zh_TW |
| dc.title | Preamble Sequence Detection in OFDM Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 109-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.coadvisor | 陳維昌(Wei-Chang Chen) | |
| dc.contributor.oralexamcommittee | 王晉良(Chin-Liang Wang),蘇育德(Yu-Ted Su),馮世邁(See-May Phoong) | |
| dc.subject.keyword | 正交分頻多工,初始同步,前導訊號偵測,廣義概似比檢驗,尼曼皮爾森標準, | zh_TW |
| dc.subject.keyword | orthogonal frequency-division multiplexing,initial synchronization,preamble detection,GLRT,Neyman Pearson criterion, | en |
| dc.relation.page | 54 | |
| dc.identifier.doi | 10.6342/NTU202001607 | |
| dc.rights.note | 未授權 | |
| dc.date.accepted | 2020-07-22 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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