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姓名 陳右昀(You-Yun Chen) 查詢紙本館藏 畢業系所 電機工程學系 論文名稱 應用於PLC 系統之AGC-CR 通道等化技術
(Design of AGC-CR Equalization for PLC System)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 電力線通訊(PLC)系統是以室內電力線網路為主要的傳輸媒介，因其具有覆蓋範圍廣、不用重新佈線、連接方便等優點，所以在近年來被世界各國所重視。雖然電力線通訊具備最後一哩的優勢，但是因為傳輸環境的雜訊干擾以及通道衰減嚴重，使得在實際資料傳輸率方面與理想的情況會有很大的落差。因此如何解決電力線傳輸通道衰減以及抵抗雜訊干擾以提升傳輸效率，一直是各界研究的重點所在。
本論文提出了指數型增益的自動增益控制與載波回覆(AGC-CR)和可調整增益的數位座標軸旋轉計算器(MGC-CORDIC)來對衰減通道做等化與補償。自動增益控制與載波回覆為將通道衰減分成增益和相角兩部份，利用LMS 演算法做適應性補償，但是這種處理方式在增益的部分須另外處理。而所提出指數型增益係數的自動增益控制與載波回覆則不須再行處理，而且還可以增快收斂的速度。
可調整增益的數位座標軸旋轉計算器則是根據輸入向量的大小和相角來計算出通道衰減程度以及相位的旋轉，可以用來取代LS 通道估測方法中的除法器。最後我們使用具有近似指數型增益的係數，配合指數型增益係數的自動增益控制與載波回覆來降低硬體複雜度。摘要(英) Power line communication (PLC) system is an indoor wire-line communication system which adopts the power line network as the transmission medium. Since the coverage area of power line network is widespread in the world, the infrastructure of power line does not need be rebuild again. Accordingly, it has the convenient advantages to be the last mile system and is paid a great attention by many countries in recent years. Although the power line communication has superiority in the last mile, the noise influence and channel fading on transmission environment are still very serious. There is still an obvious drop between the real and ideal transmission rate. Therefore, how to mitigate channel fading and resist noise
influence is the key point to increase transmission efficiency.
This thesis proposes an Auto-Gain Control and Carrier Recovery (AGC-CR) with exponential gain and a Modified Gain Control - COordinate Rotation DIgital Computer (MGC-CORDIC) to compensate for channel fading. Traditionally, AGC-CR divides channel fading into gain and phase angle, and use LMS method to make the phase adaptive compensation. But it needs a more complex gain processing additionally. On the other hand, the proposed AGC-CR doesn’t need. Furthermore, the proposed AGC-CR can speed up the converging rate. MGC-CORDIC calculates channel fading and phase rotation according to the magnitude and phase angle of the input vector. It can replace the function of divider in the Least Square (LS) estimation method. Finally we combine MGC-CORDIC and the proposed AGC-CR to reduce the hardware complexity.關鍵字(中) ★ 電力線通訊
★ 等化器
★ 自動增益控制和載波回覆關鍵字(英) ★ PLC
★ power line communication
★ EQ
★ equalizer
★ AGC-CR論文目次 摘要......................................................i
Abstract................................................iii
致謝.....................................................iv
目錄......................................................v
圖目錄..................................................vii
表目錄.................................................viii
第一章 緒論...............................................1
1.1 前言..................................................1
1.2 研究動機..............................................2
1.3 論文架構..............................................2
第二章 PLC 標準和系統架構.................................3
2.1 正交分頻多工調變介紹..................................3
2.2 系統架構..............................................5
2.3 電力線通訊規格標準....................................7
2.3.1 循環字首............................................7
2.3.2 參考信號............................................8
2.3.3 前導符元格式........................................9
2.3.4 連續領航訊號格式...................................10
2.3.5 反轉快速傅利葉轉換調變方法.........................11
第三章 頻域等化器........................................12
3.1 通道估測.............................................12
3.2 座標軸旋轉數位計算器.................................13
3.2.1 原理說明...........................................13
3.2.2 向量模式 (Vectoring Mode)..........................16
3.2.3 旋轉模式（Rotation Mode） .........................17
3.2.4 具有調整增益之座標軸旋轉數位計算器.................18
3.3 自動增益控制與載波回覆等化器 (AGC-CR) ...............28
3.3.1 傳統LMS............................................28
3.3.2 使用增益和相角.....................................30
3.3.3 使用指數型增益和相角...............................34
第四章 模擬結果..........................................41
4.1 模擬環境.............................................41
4.2 模擬結果與電路比較...................................43
第五章 結論與未來展望.......................................................48
參考文獻.................................................49參考文獻 [1] 不須重新佈線的新的上網方式 - 電力線上網
http://www.ils.org.tw/ids/pdf/upload/081601-ils-Res-doc_343.pdf
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http://www.2cm.com.tw/markettrend_content.asp?sn=0807160012
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http://www.2cm.com.tw/coverstory_content.asp?sn=0710220006
[6] 新通訊 2007 年 11 月號 81 期 - 挑戰市場普及度 電力線通訊最後一搏
http://www.2cm.com.tw/coverstory_content.asp?sn=0711060005
[7] 蒲冠志, 電力線通訊發展概況, 2004
http://ee.chit.edu.tw/ee/91-93%A6U%C3%FE%C1%BF%AEy%B8%EA%AE%C6/2006%2011%2023%20%B9q%A4O%B3q%B0T(PLC)%C0%B3%A5%CE/%B9q%A4O%BDu%B3q%B0T%B5o%AEi%B7%A7%AAp.pdf
[8] 蒲冠志, 電力線通訊技術與應用, 2007
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http://www.homeplug.org/products/whitepapers/HPAV-White-Paper_050818.pdf
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50
[11] M. Zimmermann, K. Dostert, “A Multipath Model for the Powerline Channel”, IEEE Transactions on Communications, vol. 50, no. 4, Apr. 2002
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[24] M.T. Shiue, S.S. Long, “A Blind Frequency-Domain Equalization Algorithm for OFDM/DMT System Based On AGC And Carrier Recovery,” ITC-CSCC, July 2005指導教授 薛木添(Muh-Tian Shiue) 審核日期 2008-11-17 推文 plurk
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