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博碩士論文 etd-0712115-165238 詳細資訊
Title page for etd-0712115-165238
論文名稱
Title
空時區塊編碼之對角化與正交設計及分組干擾消除方法之運用
Diagonal and Orthogonal Design of Space Time Block Codes with Group Interference Cancellation
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
44
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2015-07-27
繳交日期
Date of Submission
2015-08-18
關鍵字
Keywords
正交性質、干擾消除、解碼複雜度、編碼速率、對角化空時編碼、多輸入多輸出系統
coding rate, decoding complexity, diagonal space-time block code, multiple-input multiple-output, orthogonality, interference cancellation
統計
Statistics
本論文已被瀏覽 5645 次,被下載 543
The thesis/dissertation has been browsed 5645 times, has been downloaded 543 times.
中文摘要
我們在這篇論文提出一種在多輸入多輸出(Multi-input Multi-output ; MIMO)系統下運作的空時編碼 (Space time block code) 設計。結合高編碼速率 (Coding rate) 的對角化空時編碼 (Diagonal STBC) 和低解碼複雜度 (Low decoding complexity) 的正交空時編碼 (Orthogonal STBC), 藉此獲取兩者的優點。在我們設計的編碼中,我們以對角化空時編碼為基礎讓所設計的空時編碼具有較高的編碼速率,並且充分利用訊號星座點的相位調整和正交性質來獲取多樣性 (Diversity);在解碼部分,我們充分利用部分干擾消除 (Partial Interference Cancellation)、分組干擾消除、連續干擾消除(Successive Interference Cancellation)與正交分組等干擾消除技術排除多組訊號對彼此間的干擾。
其中分組干擾消除是利用我們碼字矩陣的對角結構,並依特定間距的正交關係交錯排列,使得接收端可利用正交投影方式消除訊號干擾,並且正交性質在進行部分干擾消除時,也能有效降低干擾消除本身的複雜度。最後我們可以得到編碼速率$2$ spcu(Symbol per channel use)、全多樣性 (Full diversity)且透過分組解碼使得解碼複雜度合理下降的新空時編碼。我們會在本論文第六章模擬中證明其錯誤率在傳送天線數目較多時遠低於正交空時編碼,且相較於相同條件下的對角化空時編碼擁有較低的解碼複雜度。
Abstract
In this paper, we propose a design of space-time block codes (STBC) for multiple-input multiple-output (MIMO) system. Leveraging high coding rate of diagonal space-time block code (DSTBC) and low decoding complexity of orthogonal block space-time coding (OSTBC). The proposed design employs the concepts of DSTBC and OSTBC to inherit both benefits. Furthermore, to achieve full diversity, encoded symbols and partitioned into a few groups with respect to different phase relations on the signal constellations. Constructing the codeword with the proposed diagonal and orthogonal structure, the proposed STBC has coding rate 2 spcu and attain full diversity. To reduce decoding complexity, the receiver adopts partial interference cancellation (PIC), group interference cancellation, successive interference cancellation (SIC) sequentially to eliminate inter-group and intra-group interference. Specifically, group interference cancellation eliminates interference through orthogonal projection of signal space based on the diagonal structure and zero padding of the proposed design. Moreover, orthogonal structure if the proposed design effectively reduces computational complexity at decoder. Through computer simulations, it shows that the proposed design outperform OSTBC in terms of BER given the same transmission rate. Moreover, the proposed decoding algorithm demand with DSTBC scheme.
目次 Table of Contents
論文審定書. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
致謝. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
摘要. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv
圖次. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
第一章簡介. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
第二章相關文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 正交空時編碼. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 準正交空時編碼. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 對角化空時編碼. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
第三章系統模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
第四章編碼設計. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 碼字設計. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 相位調整矩陣. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
第五章譯碼算法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 部分干擾消除. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 分組干擾消除. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 連續干擾消除. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.4 正交干擾消除. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
第六章模擬結果. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6.1 不同傳送天線數目下的表現. . . . . . . . . . . . . . . . . . . . . . . . 28
6.2 正交空時編碼比較. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6.3 對角化空時編碼比較. . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
第七章結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
參考文獻 References
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34
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35
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