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研究生： 方俊仁
Fang, Chun-Jen
論文名稱： 混合IBOC AM系統第三旁帶訊號設計
Signals Design of Tertiary Sideband in Hybrid IBOC AM Systems
指導教授： 蘇賜麟
Su, Szu-Lin
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 電腦與通信工程研究所
Institute of Computer & Communication Engineering
論文出版年： 2005
畢業學年度： 93
語文別： 中文
論文頁數： 48
中文關鍵詞： 訊號設計 、數位廣播
外文關鍵詞： Signals Design, AM, IBOC
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    • 　　在美規數位廣播中，已提出混合IBOC AM系統。此系統在AM頻帶上同時傳送數位廣播訊號及AM訊號。由於部分數位訊號被載在AM通道內，故自我頻段內干擾存在於混合IBOC AM系統中。自我頻段內干擾不僅造成數位訊號大量錯誤，並使AM訊號內發生擾人雜音。我們主要貢獻為提出頻域抵消的新觀念，在降低SII上，我們提出的抵消方法是相當簡單而且有效率的。

    　　Hybrid In-Band on-Channel (HIBOC) digital audio broadcasting (DAB) simultaneously with analog amplitude modulation (AM) has been proposed as a compatible solution to digital audio broadcasting in the AM band. Since some of the transmitted digital data will be conveyed within an existing (broadcasting) analog AM band, self-in-band interferences (SII) exists in the HIBOC AM system. SII will cause severe degradation on digital signals and also introduce remarkable noise on the AM signals. Our contribution is that we propose a new concept, cancellation, in the frequency domain. To reduce SII, our proposed cancellation method is simple and effective in this thesis.

    摘要 i Abstract ii Contents iii List of Tables iv List of Figures v Chapter 1 Introduction 1 1.1 Overview of Digital Audio Broadcast Systems 1 1.2 Advantages of IBOC Systems 4 1.3 How IBOC Systems Work 6 Chapter 2 Descriptions of HIBOC AM Systems 8 2.1 Transmission Specification 8 2.1.1 Waveforms and Spectra 9 2.1.2 OFDM-Based Transmitter 12 2.1.3 Transmission Subsystem 14 2.2 Receiver of HIBOC AM Systems 16 2.3 Self-in-band Interference (SII) of the HIBOC AM Systems 17 Chapter 3 Self-in-band Interference Reduction 19 3.1 Clipping Method 19 3.2 Complementary Method 21 3.3 AM-Cancellation Method 26 3.4 Modified AM-Cancellation Method 27 3.5 Quality Analysis of AM Signals 28 Chapter 4 System Simulations 30 4.1 Additional Remark for System Design 30 4.1.1 Convolutional Encoder & Viterbi Decoder 30 4.1.2 Interleaver 31 4.1.3 Mapping 32 4.2 Simulation Results 32 4.2.1 Bit-Error Comparison 32 4.2.2 Fidelity Quality Comparison 41 4.3 Code Puncture 44 Chapter 5 Conclusions 47

    [1] Overview of Digital Audio Broadcasting
    [2] http://www.ibiquity.com
    [3] iBiquity Digital Corporation, “IBOC AM Transmission Specification”, November 2001.
    [4] C.-E. W. Sundberg, Deepen Sinha, David Mansour, Mohammad Zarrabizadeh, J. Nicholas Laneman, “Multistream Hybrid In Band On Channel FM Systems for Digital Audio Broadcasting”, December 1999.
    [5] H.C. Papadopoulos, C.-E. W. Sundberg, “Simultaneous Broadcasting of Analog FM and Digital Audio Signal by Means of Adaptive Precanceling Techniques”, IEEE Transactions on Communication, Volume: 46, NO.9, SEPTEMBER 1998
    [6] B. Chen, C.-E. W. Sundberg, “Broadcasting data in the FM band by means of adaptive contiguous band insertion and precanceling techniques”, IEEE International Conference, Volume: 2, JUNE 1999
    [7] B. Chen, C.-E. W. Sundberg, “Digital Audio Broadcasting in the FM Band by Means of Contiguous Band Insertion and Precanceling Techniques”, IEEE Transactions on Communication, Volume: 48, NO.10, OCTOBER 2000
    [8] Hui-Ling Lou, Deepen Sinha, C.-E. W. Sundberg, “Multistream Transmission for Hybrid IBOC-AM with Embedded/Multidescriptive Audio Coding”, September 2002.
    [9] Mark J.Dapper, Michael J. Geile, Barry Walter Carlin, “Method and Apparatus for improving AM Compatible Digital Broadcast Analog Fidelity”, Jun.27, 1999
    [10] Barry W. Carlin, Mark J.Dapper, Michael J. Geile, “AM Compatible Digital Waveform Demodulation Using A Dual FFT”, Jun.27, 1999
    [11] Jerry C. Whitaker, Editor-in-Chief, “IBOC AM Digital Radio System”, Chapter 2-4.

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