當網際網路和多媒體傳輸被預期為未來無線通訊系統所必須具備的功能時，第三代無線CDMA通訊系統對頻寬的需求相對增加。然而，在頻寬有限的情形下，如何對頻寬做有效率的使用變成一個重要的課題。在此前提下，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DS-CDMA通訊系統中存在的多重接取干擾(Multiple Access Interference, MAI)及碼際干擾(Intersymbol Interference, ISI)。
本論文中，我們基於 演算法而發展一個在時變多重路徑通道下，使用於直接序列分碼多重接取(DS-CDMA)通訊系統的空間-時間訊號接收器。首先，經由時變多重路徑通道的空間-時間相關性，我們建立了基地台上天線陣列所接收到的訊號向量。接著利用適應性 演算法來克服訊號接收中所遭遇的都卜勒效應，然而，由於 演算法的計算負載相當大，因此我們利用切割子陣列的子權重分割技術來降低 演算法的計算複雜度。基地台接收的時變入射訊號路徑方向樣本被完整模擬呈現，從電腦模擬中，可以驗證當使用於我們所建議的空間-時間訊號接收器時， 演算法較RLS(Recursive
Least Square)演算法有更好的效能。

As the internet and multimedia transportation are envisaged as inherent functions, the generation CDMA system demands a dramatic bandwidth increase. It becomes an important topic to achieve high spectral efficiency over the limited available spectrum. Combing antenna array and equalizer structure, a space-time signal receiver is developed to overcome multiple access interference and intersymbol interference in DS-CDMA systems.
In this paper, a space-time signal receiver based on the algorithm is developed for direct-sequence code-division multiple access (DS-CDMA) communication systems in time-varying multipath channels. At first, the received signal vectors of an antenna array at base station are constructed via the spatio-temporal correlation properties of time-varying multipath channels. The adaptive algorithm is employed to mitigate the Doppler’s affect on the performance of signal detection. However, the computational burden of the algorithm is enormous. To reduce the computational complexity, the subweight partition technique is incorporated into the algorithm. The time-varying path directivity patterns for a receiver at base station are simulated. Computer simulations validate the advantages of the algorithm over the recursive least-squares (RLS) algorithm for the signal detection of the proposed space-time receiver.

感謝詞.........................I
中文摘要.......................II
英文摘要.......................III
目錄...........................IV
圖表目錄.......................VI
第一章 緒言
1.1文獻探討....................1
1.2研究動機....................3
第二章 空間-時間訊號處理.......5
2.1 無線通道現象 5
2.1.1 路徑損耗(Path Loss) 5
2.1.2 衰減(Fading) 6
2.1.2.1 緩慢衰減 6
2.1.2.2 快速衰減 7
2.1.2.3 都卜勒頻率擴展(Doppler Spread) 8
2.1.2.4 延遲擴展(Delay Spred) 8
2.1.1.5 角度擴展(Angle Spread) 9
2.2 空間-時間訊號處理 9
2.2.1 時間訊號處理(Time-Only) 9
2.2.2 空間訊號處理(Space-Only) 11
2.2.3 空間-時間訊號處理 12
2.3 電腦模擬及分析 14
第三章 時變多重路徑向量通道模擬器 22
3.1 時變多重路徑向量通道 22
3.2 第二階統計特性 25
3.3 向量通道模擬器 27
3.4 複數通道係數產生器 27
3.4.1 時間相關性轉換濾波器 29
3.4.2 空間相關性轉換 30
3.4.3 內差器 31
3.5 電腦模擬與分析 32
第四章 適應性空間-時間接收器 40
4.1 訊號模型 40
4.2 空間-時間接收器 41
4.3 遞迴最小平方演算法(RLS) 43
4.4 適應性 演算法 46
4.5 電腦模擬與分析 50
第五章 利用子權重分割技術之適應性演算法 59
5.1 子權重分割技術 59
5.2 應用子權重分割技術的適應性演算法 61
5.2.1 基於RLS濾波演算法 61
5.2.2 基於 濾波演算法 64
5.3 電腦模擬與分析 65
第六章 討論與建議 71
參考文獻 73
附錄 A i
附錄 B ii
縮寫 iii

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