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論文名稱 Title |
多輸入多輸出系統中以隨機向量量化通道資訊設計湯利森哈馬遜預編碼器之敏感度分析 Sensitivity Analysis for RVQ-based Tomlinson-Harashima Precoded MIMO Systems |
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系所名稱 Department |
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畢業學年期 Year, semester |
語文別 Language |
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學位類別 Degree |
頁數 Number of pages |
41 |
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研究生 Author |
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指導教授 Advisor |
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召集委員 Convenor |
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口試委員 Advisory Committee |
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口試日期 Date of Exam |
2014-07-29 |
繳交日期 Date of Submission |
2014-09-04 |
關鍵字 Keywords |
過量均方誤差、隨機向量量化、通道方向資訊、多輸入多輸出、湯利森哈馬遜前置預編碼器 Multiple-input multiple-output, Tomlinson-Harashima precoder, Excess mean-squared error, Random Vector Quantization, Channel direction information |
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統計 Statistics |
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中文摘要 |
本篇論文提出在多輸入多輸出下的湯利森哈馬遜前置預編碼器設計來消除符號間干擾,然而在傳送端必須至少知道完美的通道方向資訊來設計湯利森哈馬遜前置預編碼器減輕干擾。使用隨機向量量化通道回授,我們可以將量化的通道方向資訊回傳給傳送端,但不可避免的量化誤差會影響傳送端的效能,在此情況下,我們去探討在使用通道方向資訊的回授機制下,因隨機向量量化通道所降低效能的現象。我們利用過量均方誤差來衡量降低效能的大小,但量化誤差所制定的過量均方誤差函數是一個複雜的函數,我們使用二階的泰勒展開式推導出我們的分析結果。最後電腦模擬結果也證實了我們提出的分析結果,與真正的過量均方誤差吻合。 |
Abstract |
Tomlinson-Harashima precoded (THP) multiple-input and multiple-output (MIMO) systems are developed to cancel the inter-symbol interference at the transmitter. However, the THP at least requires perfect channel direction information (CDI) to completely mitigate the interference at the transmitter, which is not practical in the real world. The limited-feedback systems are developed to convey the quantized CDI to the transmitter. Using the quantized CDI to conduct the THP, an unavoidable interference degrades the performance at the receiver. In this correspondence, we investigate the performance degradation resulted from the random vector quantization (RVQ), which is a kind of CDI-based limited feedback mechanism. Here, we measure the performance degradation as the excess mean-squared error (EMSE). Since the formulation of the EMSE is a complicated function of the quantization error, we proposed using the second-order Taylor expansion to derive an analytical result. Simulation results have also verified our proposed analysis, showing that the derived analysis can match the exact EMSE. |
目次 Table of Contents |
論文審定書…………………….……………………………………..……………….....i 誌謝………………………………………………………...…..…………...……….....ii 中文摘要……………………….……………………………………..……………….. iii 英文摘要………………………………………………………..………..…...……..... iv 目錄……………………………………………………………..………….....…………v 圖次……………………………………………………………….…………....……... vi 第1章 序言……………………………………………………………………….……..1 第2 章 系統模型與最佳化設計………………………………………………...…....10 第2.1節 系統模型………………………………………………….………........……10 第2.2節 已知通道方向資訊的湯利森哈馬遜前置預編碼設計…........……....…...11 第3 章 過量均方誤差分析……………………………………………..…….…....…13 第3.1 節 接收端使用隨機向量量化通道方向資訊……………………............….13 第3.2 節 過量均方誤差分析…………….………………………………...........….14 第4章 系統模擬及探討………………………………………………………….……22 第5章 結論與未來展望………………………………………………………….……27 附錄.……………………………………………………………………………….…..28 參考文獻……………………………………………………………………………….30 |
參考文獻 References |
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