跳到主要內容

簡易檢索 / 詳目顯示

回結果列表
研究生： 黃宣瑜
Syuan-yu Huang
論文名稱： 渦輪編碼系統架構之非同調重覆式解調器
Noncoherent Iterative Demodulators for Turbo Coding Systems
指導教授： 魏瑞益
Ruey-yi Wei
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 95
語文別： 英文
論文頁數： 76
中文關鍵詞： 重覆解調 、區塊衰退通道 、渦輪碼 、重覆解碼
外文關鍵詞： block fading channel, turbo code, iterative demodulation, iterative decoding
相關次數： 點閱：10  下載：0 
分享至:
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報

    • 在數位通訊傳輸系統當中，重覆式解調結合重覆解碼的演算方法十分適合在使用在非同調區塊衰退通道之下，經由內部解調器解調以及外部解碼器的重複解碼反覆更新訊息的動作，我們可藉由更新接收訊息來獲得更佳的錯誤率。在這篇論文之中，我們討論三種不同的非同調解調器在各種同調區間，相位量化等級的情況下的模擬結果。此外在比較各個解調器的優劣之後，我們結合兩種非同調解調器提出一個新的非同調解調器。

    For digital communication transmission system, the joint noncoherent demodulation and decoding scheme is suitable for noncoherent block fading channel. By the action of iterative demodulation and iterative decoding, the information is updated repetitively and thus the error performance becomes better. In this thesis, three noncoherent demodulation schemes are employed for different coherent length and quantization level. We compare various noncoherent demodulators and propose a new noncoherent demodulation algorithm by combining two noncoherent demodulators.

    CHAPTER 1 INTRODUCTION 1 CHAPTER 2 REVIEWS OF BLOCK FADING CHANNEL, TURBO CODES, AND JOINT DEMODULATION AND DECODING SCHEME 4 2.1 Block Fading Channel Model 4 2.2 Turbo Codes 6 2.2.1 Encoding 6 2.2.2 Decoding 8 2.3 Joint Noncoherent Demodulation and Decoding Scheme 12 2.3.1 Noncoherent Block Demodulator 12 2.3.2 Inner Analysis between Demodulator and Decoder 16 CHAPTER 3 GENERALIZED NONCOHERENT ITERATIVE DEMODULATORS 19 3.1 Block Modulation Codes 19 3.2 Noncoherent Channel-Quantization Demodulator 23 3.3 Generalized Noncoherent Channel-Quantization Demodulator 28 3.4 Iterative Decision Feedback Demodulator 38 CHAPTER 4 MODIFIED NONCOHERENT ITERATIVE DEMODULATORS AND COMPARISIONS OF SIMULATION RESULTS 47 4.1 BCJR Type Iterative Demodulator 47 4.2 Modified Inner Modulator 58 4.3 Combined Noncoherent 65 4.4 Simulation Results and Comparisons 69 CHAPTER 5 CONCLUSION 74 BIBLIOGRAPHY 75

    [1] C. Berrou and A. Glavieux, “Near optimum error correcting coding and decoding: turbo-codes,” IEEE Trans. Commun., vol. 44, pp. 1261-1271, Oct. 1996.
    [2] A. Stefanov and T.M. Duman, “Turbo-coded modulation for systems with transmit and receive antenna diversity over block fading channels: System model, decoding approaches, and practical considerations,” IEEE J. Select. Areas Commum., vol.19. pp.958-968, May 2001.
    [3] J. K. Cavers, “An analysis of pilot symbol assisted modulation for Rayleigh-fading channels,” IEEE Trans. Veh. Technol., vol. 40, no. 4, pp. 686–693, Nov. 1991.
    [4] A. Krishnamoorthy and A. Anastasopoulos, “Code and receiver design for the noncoherent fast-fading channel,” IEEE J. Select. Areas Commun., vol. 23, pp, 1769-1778, Sept. 2005.
    [5] R. Y. Wei, Y. W. Hsu, and C. C. Pan, “Low-complexity noncoherent iterative space-time demodulator,” in preparation.
    [6] R. R. Chen, R. Koetter, U. Madhow, and D. Agrawal, “Joint noncoherent demodulation and decoding for the block fading channel: a practical framework for approaching Shannon capacity,” IEEE Trans. Commun., vol. 51, pp. 1676-1689, Oct. 2003.
    [7] P. Robertson, “Illuminating the structure of code and decoder of parallel concatenated recursive systematic (turbo) codes,” in Proc. IEEE Global Commun. Conf. (GLOBECOM), 1994, pp. 1298–1303.
    [8] R. Y. Wei, “Noncohernet block-coded MPSK,” IEEE Trans. Commun., vol. 53, pp. 978-986, June 2005.
    [9] B. Hassibi and B. M. Hochwald, “How much training is needed in multiple-antenna wireless links?,” IEEE. Trans. Inform. Theory, vol. 49, pp. 951–963, Apr. 2003.
    [10] F. Sun and H. Leib, “Multiple-phase codes for detection without carrier phase reference,” IEEE Trans. Inform. Theory, vol. 44, pp. 1477–1491, July 1998.
    [11] D. Warrier and U. Madhow, “Spectrally efficient noncoherent communication,” IEEE Trans. Inform. Theory, vol. 48, pp. 651–668, Mar. 2002.

    QR CODE
    :::