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博碩士論文 etd-0830111-001438 詳細資訊
Title page for etd-0830111-001438
論文名稱
Title
混合式前置編碼搭配半盲蔽式空時區塊碼的多輸入多輸出分碼多工系統
Hybrid Pre-coded ST-BC MIMO-CDMA System with Semi-blind Channel Estimation
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
83
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2011-07-05
繳交日期
Date of Submission
2011-08-30
關鍵字
Keywords
空時區塊編碼、前置編碼、多輸入多輸出分碼多工接收機、半盲蔽式
semi-blind, ST-BC, MIMO-CDMA, pre-coded
統計
Statistics
本論文已被瀏覽 5702 次,被下載 728
The thesis/dissertation has been browsed 5702 times, has been downloaded 728 times.
中文摘要
在本論文中,考慮一個新型的直接序列多輸入多輸出分碼多工接收機,在傳送端採用了前置編碼,這個混合式前置編碼的方式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,而且也能夠在接收器利用半盲蔽式通道估測來擷取出完整的通道脈衝響應資訊。在這個收發器裡,我們發展一個使用適應性線性限制常模法則的半盲蔽式適應性多輸入多輸出分碼多工接收器來還原符碼。除此之外,為了減少計算複雜度,採用廣義旁波帶消除器之架構配合遞迴式最小平方值演算法,並且同時使用梯度法則來追蹤主要用戶的振幅,被命名為廣義旁波帶消除器的常模反向-QR分解遞迴式最小平方值演算法。透過電腦模擬,採用方案的優越效能與優點得到驗證;它透過頻寬效益的換取,使得效能優於傳統使用線性限制最小變異法則,並且略優於傳統常模廣義旁波帶消除器之遞迴最小平方值的接收器。
Abstract
In this thesis, a novel pre-coded direct-sequence code division multiple access (DS-CDMA) associated with the multiple-input multiple-output (MIMO) antennas, along with Alamouti’s space-time block code (ST-BC) is considered. In the transmitter, the idea of hybrid pre-coded is exploited; it can be employed to counteract the inter-symbol interference (ISI) introduced by the channel fading duo to multipath propagation, and can be used to exacting the full information of channel impulse response (CIR) in the receiver for semi-blind channel estimation. Under this transceiver framework, we develop a semi-blind adaptive MIMO-CDMA receiver, based on the linearly constrained constant modulus (LCCM) criterion, for symbol recovery. Furthermore, to reduce the complexity of receiver design, the framework of the generalized sidelobe canceller (GSC) associated with the recursive least-squares (RLS) algorithm is adopted, and the gradient approach is applied to track the desired user’s amplitude, simultaneously, and is named as the GSC-CM-IQRD-RLS algorithm. Via computer simulations, the superior performance and the advantages of proposed scheme is verified; it outperforms the conventional LCMV-based algorithm, and slightly better than the convention CM-GSC-RLS receiver, with the paid of spectral efficient.
目次 Table of Contents
Approval Sheet ............................................................................................... i
English Abstract ............................................................................................ii
Chinese Abstract ..........................................................................................iii
List of Figures .............................................................................................. .vi
List of Tables...............................................................................................viii
Chapter 1
Introduction ................................................................................................... 1
Chapter 2
Conventional Blind Capon Receiver for Space-Time Block Coded
MIMO-CDMA Systems ................................................................................ 8
2.1 Introduction ...................................................................................................................8
2.2 Review of Space-Time Block Code (ST-BC)................................................................9
2.3 Downlink Space-Time Block Coded MIMO-CDMA in Frequency-Flat Channels….13
2.4 MMSE Receiver and Blind Capon Receiver...............................................................18
2.5 Phase Ambiguity associated with Blind Channel Estimation .....................................23
Chapter 3
Hybrid Pre-coded ST-BC MIMO-CDMA System with Semi-Blind
Channel Estimation ................................................................................... 24
3.1 Introduction .................................................................................................................24
3.2 Hybrid Pre-coded ST-BC MIMO-CDMA Receiver in Multipath Channels ...............26
3.2.1 Semi-blind Channel Estimation................................................................................38
3.3 MIMO CM-GSC IQRD-RLS Algorithm with semi-blind Channel Estimation..........39
Chapter 4
Simulation Results....................................................................................... 46
4.1 Preliminaries................................................................................................................46
4.2 Simulation Results and Some Observations................................................................48
Chapter 5
Conclusions .................................................................................................. 55
References .................................................................................................... 58
Appendix
Adaptive implementation of Semi-blind Receiver
(MIMO CM-GSC-IQRD-RLS Algorithm) ............................................... 65
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