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研究生:張崇威
研究生(外文):Chung-Wei Chang
論文名稱:LTE下鏈系統具射頻不完美與移動通道之聯合估計補償與實測
論文名稱(外文):Joint Estimation and Compensation of RF Imperfections and Mobile Channel in LTE Downlink Communication Systems with Measurement
指導教授:鄧俊宏
指導教授(外文):Jiun-Hung Deng
口試委員:李大嵩葉富銘黃正光
口試委員(外文):Ta-Sung LeeFu-Ming YehCheng-Kuang Huang
口試日期:2015-07-27
學位類別:碩士
校院名稱:元智大學
系所名稱:通訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
畢業學年度:103
語文別:中文
論文頁數:52
中文關鍵詞:LTE下鏈系統IQ不平衡整形濾波器不平衡IQ直流偏移載波頻率偏移
外文關鍵詞:LTE Downlink SystemsIQ ImbalanceShaping Filter ImbalanceIQ DC-OffsetCarrier Frequency Offset
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本論文致力研究於LTE下鏈系統中遭遇到射頻不完美之聯合估測補償技術,其中包含有IQ不平衡、濾波器不平衡、IQ直流偏移以及載波頻率偏移等影響。本論文逐一考慮更多不同的射頻衰減並提出於時域聯合估計補償方法;為了降低系統的複雜度,本論文亦提出可用於LTE之頻域等化器。此外,本論文亦採用儀器結合MATLAB軟體無線電(Instruments-in MATLAB Software-Define Radio, IM-SDR)平臺驗證所提出之估測與等化方法,並比較Rohde&;Schwarz分析儀之解調結果,於量測結果中可得知本論文所提出之演算法可於LTE下鏈系統有效的達成估計補償RF不完美問題。
最後,本論文延伸LTE系統應用於高速車內通訊的混合型通道環境,吾人提出抗移動通道之Nulling技術,並證實所提出方法可正確接收解調出具射頻不完美因子影響與固定通道影響的LTE訊號。

This thesis is dedicated to design the joint estimation and compensation techniques in LTE downlink systems with RF imperfections, which includes IQ imbalance (IQI), shaping filter imbalance (SFI), IQ DC-offset, and carrier frequency offset (CFO). Therefore, this thesis will consider more RF distortions and propose joint estimation and compensation method in time domain step by step. In order to reduce the design complexity, the frequency domain equalizer with low complexity advantage is proposed to utilize in the LTE downlink system. Finally, we also verify the proposed methods via the Instruments-in-MATLAB Software-Define Radio (IM-SDR) and compare the results with Rohde &; Schwarz signal analyzers. The results demonstrate that the proposed schemes can effectively estimate and compensate the IQI, SFI, IQ DC-offset and CFO effects in the LTE downlink systems
Finally, this thesis extends the LTE system to use for the intra vehicular communication with the fixed and varying hybrid multipath channel environments. Moreover, the nulling technology is proposed to overcome the time-varying channel problem. Simulation and IM-SDR platform confirm that the proposed method can detect the LTE signal, cancel the varying channel interference, and compensate the RF imperfection effect with fixed fading channel.

摘要 I
ABSTRACT II
目錄 IV
圖目錄 VII
表目錄 IX
縮寫表 X
數學符號 XII
第一章 緒論 1
1.1 研究動機與背景 1
1.2 論文架構 2
第二章 LTE下行鏈路通訊系統資料模型、射頻不完美問題與移動車廂 內傳播模型 3
2.1 LTE下行鏈路通訊系統 3
2.1.1 長期演進技術 3
2.1.2 框架結構與OFDMA收發機 3
2.2 射頻不完美問題 6
2.2.1 發射端IQ不平衡[11] 6
2.2.2 整形濾波器不平衡[11] 6
2.2.3 IQ直流偏移[11] 7
2.2.4 載波頻率偏移[11] 8
2.3 移動車廂內傳播模型[12][13] 8
第三章 LTE下鏈系統聯合IQI、SFI、DC-offset和CFO估測與補償之收發機設計 10
3.1 前言 10
3.2 聯合IQI、SFI、DC-offset和CFO估計與補償 12
3.2.1. CFO估計與補償 12
3.2.2. DC-offset估計與補償 18
3.2.3. IQI和SFI估計與補償 20
3.3 低複雜度頻率域等化器 23
3.4 IQ增益與相位不匹配參數估計 24
3.5 發射端預先補償射頻損失 25
3.6 電腦模擬結果 27
3.6.1. LTE下鏈系統聯合射頻不完美估計與補償電腦模擬結果 27
3.6.2. 發射端預先補償電腦模擬結果 31
3.7 量測結果與IM-SDR驗證 34
3.7.1. IM-SDR驗證場景1 35
3.7.2. IM-SDR驗證場景2 37
3.8 結論 40
第四章 LTE DL系統於移動車廂內之接收機設計 41
4.1 前言 41
4.2 通道模型與參數估測 41
4.3 資料偵測 43
4.4 疊代法加強資料偵測性能 44
4.5 電腦模擬結果與IM-SDR驗證 45
第五章 結論 49
參考文獻 50

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[27] 洪國舜,「基於USRP無線通道探測器之移動車廂內時變衰減過程量測與塑模」,2015年
[28] 謝宏陽,「Joint Estimation and Compensation of RF Imperfection in LTE Uplink Communication Systems with Measurement」,2014年

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