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研究生： 鍾景宇
Chung, Ching-Yu
論文名稱： 單載波區塊傳輸系統之有效子頻帶間干擾減輕研究
An Efficient Algorithm of Inter-Subchannel Interference Self-Reduction for the Single-Carrier Block Transmission
指導教授： 張名先
Chang, Ming-Xian
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： 2013
畢業學年度： 101
語文別： 英文
論文頁數： 56
中文關鍵詞： 正交分頻多工 、單載波區塊傳輸系統 、子頻帶間干擾 、快速時變通道
外文關鍵詞： OFDM, SC-FDE, ICI, time-varying channels
相關次數： 點閱：154  下載：2 
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    • 正交分頻多功系統在快速時變通道中存在著子頻帶間的干擾，即使提高訊雜比仍不能改善位元錯誤率，同樣的，這個問題也發生在使用頻率等化的單載波區塊傳輸系統。然而，並非所有發展於正交分頻多工系統下的子頻帶間干擾消除方法可直接應用在單載波區塊傳輸系統。
    在此論文中，我們以一些現有的子頻帶間干擾消除演算法做為參考的題材。根據單載波區塊傳輸的特徵，我們提出有效消除子頻帶間干擾的演算法。所提出的演算法亦能增加頻域符元數來消除子頻帶間干擾。此演算法並未因增加時域信號區間而進一步影響通道響應估測的效能。此演算法亦提供訊號傳輸率與消除子頻帶間干擾的平衡關係。論文最後模擬的結果證明其效用。

    In the fast time-varying channel, there exists interference among subchannels of the orthogonal frequency division multiplexing (OFDM) system. Due to this inter-subchannel interference (ICI), we cannot improve the bit-error rate (BER) signal-to-noise ratio (SNR) increases. The problem of ICI also appears in the single-carrier (SC) block transmission with frequency-domain (FD) equalization. However, not all ICI reduction algorithms for the OFDM system can be directly applied in the SC block transmission system.
    In the thesis, we consider some ICI reduction algorithms for OFDM system. Based on the characteristics of SC system, we propose an efficient ICI self-reduction algorithm. The proposed algorithm is also able to add the diversity of FD symbols to make the ICI self-reduced. Without extending the original duration of the TD signal, the algorithm does not affect the performance in the subsequent channel response (CR) estimation. This algorithm also provides the trade-off between ICI reduction and system throughput. The simulation compares our algorithm with other ICI reduction algorithm, and the results validate the effectiveness of our algorithm.

    中文摘要 I Abstract II Acknowledgement III Contents IV List of Figures VI Chapter 1. Introduction 1 Chapter 2. Single-Carrier Frequency-Domain Equalization 3 2.1 SC-FDE Systems 3 2.1.1 Linear Precoded OFDM Systems 3 2.1.2 SC-FDE Systems 7 2.2 Channel Model 9 2.2.1 Modification of Jakes' Rayleigh Fading Model 9 2.2.2 Time-Variant Channel of Jakes’ Model 12 2.3 Channel Estimation 15 2.3.1 Least-Square Fitting Approach (LSF) 15 2.3.2 Least-Squares fitting – Channel Impulse Response (LSF-CIR) 18 2.4 Frequency-domain Equalization 21 2.5 The simulation for channel estimation 23 Chapter 3. ICI Self-Cancellation in SC-FDE Systems 27 3.1 The Algorithm of ICI Self-Cancellation for SC-FDE Systems 27 3.1.1 The Pre-Processor in the Transmitter 30 3.1.2 The Post-Processor in the Receiver 31 3.1.3 Self-Cancellation of the ICI 34 3.2 An Equivalent Post-processor 36 3.3 Simulation Results 38 Chapter 4. An Efficient Algorithm of ICI Self-Cancellation 41 4.1 An Efficient ICI Self-Reduction Algorithm 42 4.1.1 The Transmitter 42 4.1.2 The Receiver 43 4.1.3 The Low-Complexity Equivalent Receiver 45 4.2 Simulation for the Proposed Algorithm 47 4.3 Compare with Different ICI Self-Cancellation Algorithms 49 4.3.1 The Algorithm for SC-FDE system 50 4.3.2 Simulation Results 52 Chapter 5. Conclusion 54 Bibliography 55

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