在本論文中，我們提出一個新型的低複雜度多輸入多輸出分碼多工系統接收機，在傳送端採用了改良式的混合式前置編碼，這個改良式的混合式前置編碼的方式配合空-時區塊編碼經由適當的設計不僅能用來對抗因為多重路徑環境所產生的符碼間干擾，而且也能夠用來萃取出完整通道的資訊。在傳送器裡，一個改良式混合式的展頻碼被提出。他不僅可以用來抑制因為多重路徑通道所產生的干擾，而且可以估測出完整的通道。而為了降低計算複雜度，我們提出了一個新的改良式部分自適應性的濾波器。他不僅有子空間部分自適應性廣義旁波帶消除濾波器的好處可以用來提升效能而且可以避開找出特徵向量所需的計算複雜度。再來，結合改良式的接收器，在接收器，使用適應性線性限制常模法則的條件下，我們提出一個半盲蔽式多輸入多輸出分碼多工濾波器組並配合遞迴式最小平方值演算法和使用在一個改良式部分自適應性廣義旁波帶消除器之架構下。電腦模擬結果可以證實我們所新提出的接收器相較於傳統使用線性限制條件常模法搭配廣義旁波帶消除器之架構配合遞迴式最小平方值演算法的接收器會有較好的效能，並且會有較低的複雜度。

In this thesis, we present a new low-complexity receiver with the modified hybrid signature direct-sequence code division multiple access (DS-CDMA) system framework that use the multiple-input multiple-output (MIMO) antennas along with Alamouti’s space-time block code (ST-BC). In the transceiver, the modified hybrid signature is exploited. It is not only used to counteract the inter-symbol interference (ISI) introduced by the channel fading duo to multipath propagation but also very useful for extracting the full channel information in the receiver. For reducing computational complexity, we propose a new modified partial adaptivity (MPA) filter. It is not only having the advantage of subspace-based PA-GSC filter to enhance the system performance but also avoid the computation requirement when the Eigen-decomposition approach was adopted. Next, with the modified transceiver framework, in the receiver, based on the linearly constrained constant modulus (LCCM) criterion, we propose a novel semi-blind multiple detector schemes for MIMO-CDMA systems, which is implementing with the adaptive RLS algorithm and framework in the modified partially adaptive (MPA) generalized sidelobe canceller (GSC) . Our proposed scheme is able to perform the two-branch filterbank of LCCM MIMO-CDMA receiver. Computer simulations demonstrate that the proposed receiver has better performance than the convention CM-GSC-RLS receiver with much lower computational load.

Acknowledgements i

Abstract ii

Contents iii

List of Figures v

List of Tables vii

Chapter 1
Introduction 1

Chapter 2
Conventional Blind Capon Receiver for Space-Time Block Coded MIMO-CDMA Systems 7
2.1 Introduction 7
2.2 Review of Space-Time Block Code (ST-BC) 8
2.3 Downlink Space-Time Block Coded MIMO-CDMA in Frequency-Flat Channels 11
2.4 MMSE Receiver and Blind Capon Receiver 15
2.5 Phase Ambiguity associated with Blind Channel Estimation 20
Chapter 3
ST-BC MIMO-CDMA Transceiver with Modified Hybrid Signature in Multipath Channels 21
3.1 Introduction 21
3.2 Modified Hybrid Signature ST-BC MIMO-CDMA Transceiver 22
3.2.1 Semi-blind Channel Estimation 33
3.3 Modified Partially Adaptive Linear Filter 33
3.3.1 Design of Modified Partially Adaptive Linear Filter 33
3.3.2 Complexity Reduction with Modified Partial Adaptive (MPA) Array Approach 34
3.4 CM-MPA-GSC-RLS Algorithm with Semi-blind Channel Estimation 36
3.5 Bandwidth Efficiency 38
Chapter 4
Simulation Results 40
4.1 Preliminaries 40
4.2 Simulation Results and Some Observations 41

Chapter 5
Conclusions 46

Appendix A
Partial Adaptive (PA) Filter Design in Reference [1] 48

Appendix B
CM-MPA-GSC-RLS Algorithm 50

References 52

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