臺灣博碩士論文加值系統

論文摘要
本論文針對時空籬柵編碼，擬以多層次編碼（multilevel coding）技術來降低其複雜度，第三章以全多樣性（full diversity）之時空編碼為主題，採用[4]中的一個碼，來設計三個傳送天線的時空區塊編碼，並改變星座圖的符號標記法（labeling），以計算時空碼的行列式值（determinant）的方式，研究符號標記法與錯誤率效能的關係，並以此架構轉換成一時空籬柵編碼的架構，試圖找出除了延遲多樣性架構之外，設計時空籬柵編碼的準則。
第四章以非全多樣性的時空編碼為出發點，觀察在增加傳輸率的同時，相較於時空籬柵編碼錯誤率效能的下降幅度，研究其原因，並研擬改進的方法。

This thesis is aimed at space-time trellis coding, using multilevel coding technology to decrease complexity. Chapter 3 focuses on full diversity space-time codes, using a code in [4] to design a space-time block code which has three transmission antennas. We try to change signal labeling and calculate　determinant in order to research error performance and transform this structure to a type of space-time trellis codes. Try to find a design method to construct space-time trellis codes instead of delay diversity scheme.
Chapter 4 focuses on non-full diversity space-time codes which increase transmission rate and reduction of observe error performance. We also compare with space-time trellis coding in order to obtain more insights and improve its error performance.

第一章 緒論 1
1.1時空編碼簡介.........................................................1
1.2多重路徑衰退.........................................................3
1.3研究動機.............................................................4
第二章 時空編碼系統分析與建構 5
2.1系統模型.............................................................5
2.2時空編碼的錯誤率分析及建構準則........................9
2.3傳輸率、多樣性、籬柵複雜度的取捨....................15
2.4計算與設計實例......................................................17
第三章 最大多樣性多層次時空編碼 21
3.1多層次編碼..........................................................21
3.2一種8-PSK多層次時空編碼.....................................24
3.3變換星座圖符號對時空編碼的影響.........................29
3.48-PSK多層次時空編碼改良.....................................34
第四章 非最大多樣性多層次時空編碼 42
4.1傳輸率為5的多層次時空編碼...............................42
4.2傳輸率為6的多層次時空編碼...............................47
4.3以碼搜尋方式改進錯誤率效能...............................50
4.4其他改進方法及與時空籬柵編碼的比較...............59
第五章 結論

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