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研究生： 簡紹倫
Shao-Lun Chien
論文名稱： 么正空時調變的碼搜尋
Code Searches of Unitary Space-time Modulation
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： 99
語文別： 中文
論文頁數： 66
中文關鍵詞： 分集乘積 、漸進聯集上界 、平坦衰退通道 、么正空時調變
外文關鍵詞： diversity product, asymptotic union bound, Unitary space-time modulation, flat fading channel
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    • 么正空時調變可用於傳送端與接收端不知道衰退係數的平坦衰退通道中，本論文提出一種新的么正空時調變，不同於過去所提出的架構，我們考慮不具有代數結構的么正空時碼字，使用漸進聯集上界與分集乘積去電腦搜尋么正空時碼字。

    Unitary space-time modulation(USTM) is well tailored for flat fading channels where neither the transmitter nor the receiver knows the fading coefficients. In this thesis, we propose a new schemes of unitary space-time modulation. Different from the past proposed systematic codeword, we consider the unitary space-time codeword which don’t have the algebraic structure. Then we use asymptotic union bound and diversity product to search unitary space-time codeword.

    摘要 Abstract 圖表目錄 目錄 第一章 緒論 1.1 空時碼的念…………………………………………………1 1.2 空時碼的系統型……………………………………………3 1.3 研究動機……………………………………………………4 第二章 各種空時碼介紹 2.1 么正空時調變………………………………………………5 2.1.1 信號設計…………………………………………………6 2.1.2 搜索最佳生成矩陣………………………………………8 2.2 以訓練碼建構么正空時調變………………………………10 第三章 么正空時調變的碼字建構與碼搜尋 3.1 設計準則一：漸近聯集上界………………………………12 3.1.1 雷利衰退通道……………………………………………12 3.1.2 最大概似檢測器的效能…………………………………13 3.1.3 以建近聯集上界建構碼字………………………………14 3.2 設計準則二：分集乘積……………………………………15 3.3 最佳化24APSK信號星座圖………………………………16 3.3.1 信號星座圖………………………………………………17 3.3.2 最佳化24APSK內外圈半徑值……………………………19 3.4 碼字的位元對應……………………………………………25 第四章 模擬結果 4.1 比較不同設計準則…………………………………………28 4.2 與之前的USTM比較………………………………………39 4.3 與訓練碼建構的么正空時調變比較………………………45 4.4 區塊錯誤率…………………………………………………53 第五章 結論 參考文獻…………………………………………………56

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