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研究生: 鄭如舫
Ju-Fang Cheng
論文名稱: 用於查表之相差編碼的訊號星座圖
Signal Constellations for Differential Encoding by a Look-Up Table
指導教授: 魏瑞益
Ruei-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
論文出版年: 2016
畢業學年度: 104
語文別: 中文
論文頁數: 101
中文關鍵詞: 訊號星座圖查表相差編碼
外文關鍵詞: Signal Constellations, Look-Up Table, Differential Encoding
相關次數: 點閱:31下載:0
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  • 有一種新的相差編碼器被提出,它是藉由查表法所得到,且相差編碼若使用查表法可降低複雜度和有較好的錯誤效能,再者使其𝑁符號差分編碼表檢測最佳化。本篇論文以此一主題,針對各種𝑁來調整16QAM、16APSK及32APSK的星座圖,當我們調整星座圖的參數時,相對應會建立差分編碼表,而其中選擇的參數結果是具有最佳的最小非同調距離,調整後的星座圖最小非同調距離會大於原本星座圖,而其錯誤效能也在模擬結
    果證實有較好表現。


    A new differential encoder by a look-up table was proposed. Using a table for differential encoding has the advantages of both low complexity and good error performance. The table for N symbol differential detection was optimize as well. In this thesis, we modify the signal constellation of 16QAM , 16APSK and 32APSK for various values of N . The parameters of signal constellation are changed, and the corresponding differential encoding table is constructed.
    The parameters which result in the best minimum noncoherent distance are selected. The minimum noncoherent distance of modified constellation is larger than that of the original constellation. The error performance of the modified
    constellations are verified by computer simulations.

    摘要 ..............................................................................................................Ⅰ Abstract ..........................................................................................................Ⅱ 目錄 ................................................................................................................Ⅲ 圖表目錄 ........................................................................................................Ⅴ 第一章 緒論 ....................................................................................................1 1.1 背景與研究動機 ...................................................................................1 1.2 章節介紹 .............................................................................................. 2 第二章 回顧查表之相差編碼與多重符號相差編碼.................... 3 2.1 相差編碼表 .......................................................................................... 3 2.1.1 符號與定義 .................................................................................... 3 2.1.2 主要演算法之查表法的例子 ........................................................ 5 2.1.3 建構編碼表演算法 ........................................................................ 5 2.2 16QAM相差編碼表 ........................................................................... 10 2.2.1 通道模型 ..................................................................................... 10 2.2.2 建立16QAM的相差編碼表 ........................................................ 11 2.2.3 兩符號相差檢測 .......................................................................... 15 2.2.4 16APSK縮減星座圖和編碼表 ................................................. 16 2.3 多重符號相差編碼 ............................................................................. 17 2.3.1 定義多重符號相差編碼與檢測 .................................................. 17 2.3.2 三符號相差編碼 .......................................................................... 19 2.3.3 四符號相差編碼 ........................................................................ 20 第三章 16點星座圖及相差編碼之調整 ...................................................... 21 3.1 星座圖之調整參數及調整方法 ......................................................... 21 3.2 16QAM星座圖 .................................................................................... 24 3.2.1 二符號16QAM星座圖之調整參數 ............................................. 24 3.2.2 三符號16QAM星座圖之調整參數 ............................................ 29 3.2.3 四符號16QAM星座圖之調整參數 ............................................ 35 3.3 16APSK星座圖 ................................................................................... 41 3.3.1 二符號16APSK星座圖之調整參數 ............................................ 41 3.3.2 三符號16APSK星座圖之調整參數 ............................................ 43 3.3.3 四符號16APSK星座圖之調整參數 ............................................ 46 3.4 五符號相差編碼 ................................................................................. 50 3.4.1 五符號16QAM星座圖 ................................................................ 50 3.4.2 五符號16APSK星座圖之調整參數 ............................................ 53 第四章 32點星座圖及相差編碼之調整 ...................................................... 58 4.1 星座圖之調整參數及調整方法 ......................................................... 58 4.2 32QAM星座圖 .................................................................................... 61 4.2.1 回顧二符號32QAM ..................................................................... 61 4.2.2 三符號32QAM ............................................................................. 62 4.3 32APSK星座圖 ................................................................................... 69 4.3.1 二符號32APSK-Ⅰ星座圖之調整參數 ...................................... 69 4.3.2 二符號32APSK-Ⅱ星座圖之調整參數 ...................................... 73 4.3.3 二符號32APSK-Ⅲ星座圖之調整參數 ...................................... 75 4.3.4 三符號32APSK-Ⅰ星座圖之調整參數 ..................................... 78 4.3.5 三符號32APSK-Ⅱ星座圖之調整參數 ...................................... 83 4.3.6 三符號32APSK-Ⅲ星座圖之調整參數 ...................................... 86 第五章 結論 ................................................................................................. 90 參考文獻 ....................................................................................................... 91

    [1] W. Weber, III,“Differential encoding for multiple amplitude and phase shift keying systems,”IEEE Trans. Commun., vol. 26, pp. 385-391, Mar. 1978.

    [2] D. Warrier and U. Madhow, “Spectrally efficient noncoherent communication,”IEEE Trans. Inform. Theory, vol. 48, pp. 651-668, Mar. 2002.

    [3] R. Y. Wei,“Differential encoding by a look-up table for quadrature-amplitude modulation,” IEEE Trans. Commun., vol. 59, pp. 84-94, Jan. 2011.

    [4] R. Y. Wei,“Further Results on Differential Encoding by a Table,” IEEE Trans. Commun., June. 2012.

    [5] 魏秀如, ”用於多重符號相差檢測之使用查表相差編碼,” 國立中央大學通訊工程研究所,碩士論文, 七月. 2011.

    [6] 黃俞豪, ”多重符號相差編碼,” 國立中央大學通訊工程研究所,碩士論文, 七月. 2012.

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