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博碩士論文 etd-1018111-160547 詳細資訊
Title page for etd-1018111-160547
論文名稱
Title
LTE系統的雜訊估測研究
Research on Noise Estimation for LTE systems
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
48
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2011-10-11
繳交日期
Date of Submission
2011-10-18
關鍵字
Keywords
關係訊號、通道估測、雜訊功率估測、正交分頻多工、長期演進
reference signal, Term-LTE, channel estimation, noise power estimation, orthogonal frequency division multiplexing
統計
Statistics
本論文已被瀏覽 5655 次,被下載 746
The thesis/dissertation has been browsed 5655 times, has been downloaded 746 times.
中文摘要
下一代4G行動通訊標準--長期演進(Long Term Evolution, 簡稱 LTE)在下行鏈路使用正交分頻多工(Orthogonal Frequency Division Multiplexing, 簡稱 OFDM)為主要傳送技術,
在傳送時會加入關係訊號(Reference Signals ,簡稱RS)做為輔助,雖然加入關係訊號會減少原先可以傳送的頻寬,但有效的利用關係訊號可以使得整個通訊系統效能上升,所以如何利用關係訊號進行通道和雜訊的估測是重要的議題。
本論文是基於LTE系統的標準,利用關係訊號之間的交相關和自相關,探討估測通道響應(Channel impluse response, 簡稱CIR)和雜訊功率(Noise Power),主要的貢獻是在改良雜訊功率估測。理想的情況下,估測的資料越多準確度越高,但因為雜訊估測必須在資料量被限制的情況下進行,本篇論文提出一個改進的方式,將在有限資料進行雜訊估測。
Abstract
In this thesis, we study the noise power estimation in the LTE system. Two approaches, the weight method and the subspace method, are considered.
The performance of noise power estimation using the weight method highly depends on the accuracy of the channel estimation.
The channel estimation usually gets poor results under scenarios with long delay spreads. Therefore, the weight method also gets poor result.
To overcome the mentioned drawback, we propose the subspace method which is independent from the channel estimation.
From simulation results, we observe that the subspace method gets bias results. However, the bias depends on the length of the observation window and only gets a little influence from the channel conditions.
Therefore, we can correct the bias using a simple look-up-table approach. Computer simulations show that the subspace method gets the more accurate result than the weight method.
目次 Table of Contents
目錄
摘要i
Abstract ii
目錄iii
圖次v
表次vii
1 緒論 1
2 背景與文獻調查 2
2.1 正交分頻多工. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
2.2 長期演進系統描述. . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 問題描述 14
3.1 系統模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2 通道估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3 估測設計. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.4 一維通道估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5 雜訊功率估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4 模擬結果 24
4.1 通道估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
iii
4.2 雜訊估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5 結論 38
參考文獻 39
參考文獻 References
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and modulation (release 8 ),” 3rd Generation Partnership Project.
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[3] S. Sesia, I. Toufik and M. Baker, LTE the UMTS long term evolution : from theory to practice
. A John Wiley and Sons, Ltd, Press, 2009.
[4] Alan J. Laub, Matrix Analysis for Scientists and Engineers. SIAM : Society for Industrial
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[5] L. Hanzo, M. Muenster, B. Choi, and T. Keller, OFDM and MC-CDMA For Broadband
Multi-User Communications, WLANs and Broadcasting. New York: Wiley Press, 2003.
[6] D. Wang , L.-G. Jiang and C. He, “Robust noise variance and channel estimation for SC-FDE
UWB systems under narrowband interference,” IEEE Transactions on Wireless Communications
, vol. 8, no. 6, pp. 3249 - 3259, jun. 2009.
[7] V. D. Nguyen , H.-P. Kuchenbecker and M. Patzold, “Estimation of the channel impulse
response length and the noise variance for OFDM systems,” Vehicular Technology Conference,
2005. VTC 2005-Spring. 2005 IEEE 61st , vol. 1, pp. 429 - 433, jun. 2005.
[8] S. Shen , H. Long , J. Kuang , K. Zheng and W. Wang, “Two novel noise estimation meth-
ods with low complexity for the OFDM system,” Communications, Circuits and Systems
(ICCCAS), 2010 International Conference on , pp. 6 - 9, jul. 2010.
[9] G. Huang, A. Nix and S. Armour , “DFT-Based Channel Estimation and Noise Variance Es-
timation Techniques for Single-Carrier FDMA,” Vehicular Technology Conference Fall (VTC
2010-Fall), 2010 IEEE 72nd , pp. 1 - 5, 6 - 9 Sept. 2010
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