利用壓縮感知法消除多輸入輸出電力線傳輸之脈衝雜訊

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吳承哲(WU,CHENG-TSE) 查詢紙本館藏

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通訊工程學系

論文名稱

利用壓縮感知法消除多輸入輸出電力線傳輸之脈衝雜訊
(Impulsive Noise Mitigation with Compressive Sensing for MIMO Power Line Communication)

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摘要(中)

電力線通訊(powerline communications, PLC) 最近研究採用多輸入多輸出(Multiple-input Multiple-output, MIMO) 的正交分頻多工(orthogonal frequencydivisionmultiplexing, OFDM) 系統，以改善過去在實體層(physical layer) 資料傳輸效能不足的問題，然而電力線系統除了存在可加性白高斯雜訊(Additive White Gaussian Noise, AWGN) 之外，還會產生具有高能量的脈衝雜訊(impulsive noise,IN)，導致系統的效能嚴重傷害。
有別於過去一些傳統的脈衝雜訊消除法，在本論文中我們使用一個名為壓縮感知(compressive sensing, CS) 的演算法來估計PLC 測脈衝雜訊的能量及其在傳送過程中發生的時機點後將其進行濾除的動作，為了證明CS 演算法的有效性，我們針對不同狀況下的脈衝雜訊做模擬分析，並搭配後續的通道估測及MIMO解調器，驗證系統的位元錯誤率(bit-error rate, BER) 在相同SNR 下能與無脈衝
雜訊時的性能相近。

摘要(英)

Powerline communications(PLC) has been recently studied to apply the multipleinput
multiple-output(MIMO)orthogonal frequency-division multiplexing (OFDM) technology
in order to solve the problem of insufficient data transmission rate on the physical
layer. However, the powerline system not only has the additive white Gaussian
noise(AWGN), but also has high energy of impulsive noise(IN) that can do serious damage
to the performance of the PLC system.
Very different from some traditional impulsive noise elimination methods in the past,
we develop an algorithm called compressive sensing(CS) in this thesis to estimate the
energy of the impulsive noise and its presence position in the process of transmission
and then filter it out. In order to show the effectiveness of the proposed algorithm, we
simulate the MIMO PLC transmission with the impulsive noise in the different environments.
Together with the MIMO channel estimation and different MIMO detection
methods, we can see that the bit-error rate(BER) performance of the proposed algorithm
can approach the case without the impulsive noise at the same SNR.

關鍵字(中)

★ 電力線通訊
★ 脈衝雜訊
★ 壓縮感知

關鍵字(英)

★ powerline communication
★ impulsive noise
★ compressive sensing

論文目次

中文摘要. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
英文摘要. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
圖目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
表目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 簡介. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
第2 章System Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 PLC 規格介紹. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.1 調變方式及載波設置. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1.2 功率分配. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3 MIMO precoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.4 OFDM 傳送端流程. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.5 OFDM 接收端流程. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 PLC 上的MIMO 通道模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 脈衝雜訊的產生及模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
第3 章消除脈衝雜訊以及解調MIMO 訊號. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.1 非線性預處理器消除脈衝雜訊. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 以Compressive Sensing 法消除IN . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2.1 Compressive Sensing 演算法的介紹. . . . . . . . . . . . . . . . . . . . . . . 16
3.2.2 Compressive Sensing 法之IN 消除. . . . . . . . . . . . . . . . . . . . . . . . 19
3.3 通道估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.4 MIMO-Detector 訊號偵測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.4.1 回授通道資訊給傳送端做MIMO precoding . . . . . . . . . . . . . . . . . 29
3.4.2 OSIC 偵測法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
第4 章系統模擬與結果分析. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.1 模擬環境說明. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.2 通道估計性能比較. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.2.1 ? = 0:001 時非線性預處理器的門檻. . . . . . . . . . . . . . . . . . . . . . 41
4.2.2 ? = 10?5 時非線性預處理器的門檻. . . . . . . . . . . . . . . . . . . . . . . 48
4.3 precoding 架構下不同IN 消除法之BER . . . . . . . . . . . . . . . . . . . . . . . 56
4.4 使用CS 法時不同MIMO detector 之BER 差別. . . . . . . . . . . . . . . . . 60
4.5 使用CS 法脈衝雜訊的最大出現機率. . . . . . . . . . . . . . . . . . . . . . . . . 66
第5 章結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

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指導教授

張大中(Dah-Chung Chang)

審核日期

2018-5-31

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