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研究生： 吳若瑜
Ruo-Yu Wu
論文名稱： 具多使用者干擾消除之單載波頻率等化器分碼多工系統
An SC-FDE CDMA System with Multiuser Interference Mitigation
指導教授： 張大中
Dah-Chung Chang
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： 98
語文別： 中文
論文頁數： 65
中文關鍵詞： 單載波頻率等化器分碼多工系統 、多使用者干擾
外文關鍵詞： SC-FDE CDMA, MUI
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    • 在本篇論文，我們將單載波頻域等化器系統運用在上行的分碼多工系統上，並提出將解展頻放於頻域等化器前，其好處為可以使頻域等化器的離散傅利葉與離散反傅利葉點數減少，可大幅降低系統複雜度。分碼多工系統可提升系統容量，但隨使用者增加，使用者間干擾也會越嚴重，這種干擾稱為多使用者干擾，本篇論文使用一個去除多使用者干擾疊代法，可有效的將干擾消除。最後，我們將判別回授等化器結合在單載波頻域等化器分碼多工系統，可更進一步提升系統效能。模擬結果顯示去除多使用者干擾疊代法加上判別回授等化器可有效消除多使用者干擾並提升系統效能。

    In this thesis, we consider the single-carrier frequency domain equalizer (SC-FDE) system used for the uplink of code division multiple access (CDMA) systems in which the code despreading is performed in front of the equalizer. The main advantage of the new despreading scheme is to reduce the number of the discrete Fourier and inverse Fourier transform points required in the FDE compared to the conventional CDMA dispreading scheme.
    Although the CDMA system can enhance system capacity, as the number of users increases, the multiuser interference (MUI) problem needs to be carefully dealt with. In our study, an iterative multiuser interference removal method in a combination of decision feedback equalization is applied. Simulation results show that the proposed despreading scheme significantly reduces the FFT size and the proposed iterative MUI removal method can majorly eliminate MUI with only a small number of iteration.

    目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 圖目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . II 表目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . III 第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 第2 章SC-FDE-CDMA 系統架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 系統模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 第3 章具MUI 消除之SC-FDE CDMA 系統. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.1 消除MUI 系統架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3.2 頻域等化器(FDE) 與判別回授等化器(DFE) . . . . . . . . . . . . . . . 21 3.2.1 頻域等化器(FDE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.2.2 判別回授等化器(DFE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.3 雜訊能量估計. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 3.4 複雜度分析. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 第4 章系統模擬與分析. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.1 系統模擬參數設定. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.2 通道頻率響應估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.3 模擬結果. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 4.3.1 去除多使用者干擾之疊代比較. . . . . . . . . . . . . . . . . . . . . . . 34 4.3.2 去除MUI 之演算法比較. . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 4.3.3 去除多使用者干擾方法之性能比較. . . . . . . . . . . . . . . . . . . 40 4.3.4 雜訊能量估測. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 第5 章結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

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