臺灣博碩士論文加值系統

在軟體通訊的架構下，數位信號處理被廣泛地應用在全數位式的`通訊裝置，本論文將針對數位式接收器中具有調適性功能特性的結構加以分析及設計。在接收器中的類比－數位轉換器之量化器與載波合成部份，利用波形塑造的理念來移動其量化誤差之頻譜特性，使其在較重要的頻段中之量化誤差能夠相對的減少。在取樣降頻濾波器的設計上，以多級濾波器的設計方法，將取樣降頻濾波器設計成多級的形式，以降低所需之低通濾波器的設計複雜度，並輔以梯度搜尋的方式去調適各級濾波器的係數，使其可隨著信號特性改變時加以調適之，進而達成較好的效能。除此之外，接收器中所用到的相關設計技巧，亦可應用到發射器中。最後整合相關結構之調適性功能，並經由程式模擬加以驗証其效益。

Under the framework of the software radio system, digital signal processing techniques have been widely employed in many all-digital communication devices. This thesis mainly addresses the analysis and synthesis of the adaptation mechanism in digital receiver. The concept of waveshaping is employed in the adaptive A/D converter and carrier synthesizer in the receiver to redistribute the spectrum of the quantization noise. In order to reduce the system complexity of the downsampling filter, a multistage multirate filter is adopted. In the design of this decimation filter, a gradient search algorithm has been developed to adjust the coefficients of this multistage filter based upon the signal characteristics and a chosen cost function. Furthermore, the techniques developed for the analysis and synthesis of digital receivers may be easily adapted for digital transmitters. The functionality and the performance of the proposed techniques have been verified via computer simulation

中文摘要I
英文摘要II
誌謝 III
目次IV
圖表目次VI
第一章 緒論1
第二章 量化及波形塑造之基本理論5
2.1量化理論5
2.1.1量化器誤差5
2.1.2 係數量化及計算捨入誤差11
2.2 波形塑造13
2.2.1時域的波形塑造13
2.2.2 雜訊塑造15
第三章 數位式接收器之調適性功能分析與設計22
3.1 A/D轉換器中之量化器23
3.1.1長時間觀察下之取樣量化誤差24
3.1.2 弦波信號之取樣量化誤差25
3.1.3 調變系統之量化誤差26
3.1.4 量化器之調適性功能分析及設計30
3.1.5 實例驗証38
3.2 取樣降頻濾波器40
3.2.1 工作原理40
3.2.2 多級取樣降頻濾波器之分析與設計42
3.2.3 取樣降頻濾波器之調適性功能分析與設計47
3.3 數位式本地振盪器55
3.3.1工作原理55
3.3.2數位式本地振盪器之調適分析與設計58
3.4 數位式發射器之調適性功能分析與設計60
第四章 系統模擬及驗証64
4.1 測試信號之描述64
4.2 模擬系統之架構65
4.3 模擬結果分析及調適效益驗証67
第五章 結論75
參考文獻77
作者簡介
授權書

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