臺灣博碩士論文加值系統

在行動通訊的環境中，存在著多使用者造成的多重接取干擾(Multiple Access Interference, MAI)及多重路徑造成的碼際干擾(Intersymbol Interference, ISI)，於是一個結合天線陣列和等化器結構的空間-時間訊號接收器被發展來克服存在直接序列分碼多重接取(Direct Sequence-Code Division Multiple Access, DS-CDMA)通訊系統之多重接取干擾及碼際干擾，與時變通道對接收機效能造成的影響。
因此，我們擬建立一時變多重路徑之模擬通道，並探討一個使用於DS-CDMA通訊系統的空間-時間訊號接收器，同時利用最小均方誤差(MMSE)演算法以及遞回最小均方誤差(Recursive Least Square, RLS)適應性演算法，來調整空間-時間訊號接收器中之權重(weight)，以達到最佳之訊號偵測。
然後我們將再探討都卜勒(Doppler)效應中行動端移動速度 以及訓練序列(Training sequence)與訊號序列(Data sequence)，兩者長度的比例關係，以及藉由訓練序列來得到能補償通道失真，且能應用於接收訊號序列時，補償時變通道失真的最佳權重。

In mobile communication systems, there exist multiple access interference (MAI) caused by multiuser and intersymbol interference (ISI) induced by multipath. Combing antenna array with equalizer structure, a space-time receiver is developed to overcome the MAI, ISI, and the influence of time-varying channels in DS-CDMA communication systems.
Therefore, a simulator for time-varying multipath channels is constructed. Moreover, a space-time signal receiver is developed in DS-CDMA communication systems with time-varying multipath channels. To optimize signal detection, the weights in the space-time receiver are adjusted based on the minimum mean-squared error (MMSE) algorithm and the recursive least-squares (RLS) algorithm. The relation between the mobile speed and the length proportion of the two received sequences, including training and data sequences, is investigated.

目錄 頁次
中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VI
表目錄 VII
第一章 緒言
1.1文獻探討 1
1.2研究動機 4
第二章 時變多重路徑向量通道模擬器 7
2.1 時變多重路徑向量通道 7
2.2 第二階統計特性 11
2.3 向量通道模擬器 13
2.4 複數通道係數產生器 14
2.4.1 時間相關性轉換濾波器 15
2.4.2 空間相關性轉換 17
2.4.3 內差器 18
2.5 電腦模擬與分析 19
第三章 適應性空間-時間訊號處理 34
3.1 訊號模式與時變通道架構 35
3.2 空間-時間接收器 36
3.3 空間-時間訊號處理 39
3.4 遞迴最小平方演算法(RLS) 40
3.5 都卜勒效應與訓練序列和訊號序列的關係 43
3.6 電腦模擬與分析 44
第四章 討論與建議 55
參考文獻 58
縮寫 61
授權書 62

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