本論文在於使用SGA(Standard Gaussian Approximation)和IGA(Improved Gaussian Approximation)方法分析次取樣法軟體無線電性能，在這一部分的研究工作中，我們首先討論利用次取樣法在中頻或射頻端直接取樣的軟體無線電架構，分析不同取樣頻率與不同A-D轉換器的量化誤差和clock jitter對系統性能的影響，其中clock jitter包括smapling clock jitter 和在高速A-D轉換器中常用的Time-interleave A-D轉換器所產生的Time Skew Error。我們進一步使用SGA和IGA方法來分析軟體無線電展頻架構於多路徑衰減通道中的性能表現，以及應用RAKE接收器對系統的改良，同時對於在Rayleigh fading 通道中，分析軟體無線電性能，最後探討理想軟體無線電可能實現架構和不同軟體無線電架構之間的差異和優缺點。

Due to recent advances in technologies of high-speed digital signal processors (DSP) and analog-to-digital converter (ADC), the commercial implementation of software radio has become feasible. This project studies several software radio architectures, where RF/IF signal is digitized using bandpass sampling and all subsequent processing is implemented in software. The quantization noise and sampling clock jitter noise of the ADC in the receiver are taken into account in our analysis. A numerical method, the standard Gaussian approximation (SGA) algorithm and Improved Gaussian approximation (IGA) algorithm, is employed explicitly to study bit error rate of CDMA systems under varying multipath fading environment. Two different types of RAKE receiver structures, equal gain combining RAKE and maximum ratio combining RAKE, are also considered for software radio CDMA systems to mitigate multipath fading effects of mobile channels. The performance of software-radio based CDMA system is evaluated considering various system implementation structures.

中文摘要 ………………………………………………………………………...i
英文摘要 ………………………………………………………………………..ii
誌謝 ……………………………………………………………… iii
目錄 …………………………………………………………….iv
圖目錄 ………………………………………………….……….vi
表目錄 …………………………………………………………..xiv
第一章 軟體無線電簡介 ……………………………………1
1-1 前言………………………………………………………1
1-2 軟體無線電架……………………………………………1
1-3 軟體無線電理論基
1-3-1 基本取樣定理-Nyquist取樣定理……………….……..4
1-3-2 帶通訊號取樣理論……………………………………………………..5
1-4 Digital down-converter (DDC)…………….…10
第二章 數位類比轉換器對軟體無線電接收機性能影響分析…...12
2-1 量化誤差(Quantization Error) ……………....……12
2-2 振盪偏移誤差(Clock Jitter Error)….…………….15
2-2-1 取樣偏移誤差(Timing Skew Error) ………………….15
2-2-2 取樣振盪偏移(Sampling Clock jitter) …….…….17
2-3 模擬結果與討論…………………………….………….21
2-4 因A/D轉換器產生雜訊對DS/SS-BPSK系統誤碼率影…….24
2-5 結果與討論…………………………………………..…26
第三章 DS-CDMA直接序列展頻BPSK系統在軟體無線電下之性能分析
3-1 DS-CDMA多用戶系統之性能分析…………..……….32
3-2 DS-CDMA多用戶系統在多重路徑之性能分析………..54
3-3 在多路徑衰減通道下使用RAKE receiver之系統性能分析…81
3-4 DS-CDMA多用戶系統在Rayleigh Fading通道中之性能分析104
第四章 理想軟體無線電架構的研究……….…….124
4-1 概論 …………………………..…….……124
4-2 取樣演算法………………………………… 125
4-3 系統架構………………….…….………….127
4-4 結果與討論……………...………..……..139
第五章 理想軟體無線電架構的研究……………….146
參考文獻 ………………………………………………148

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