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研究生:周恩弘
研究生(外文):En-hung Chou
論文名稱:隨機互補碼MIMO-CDMA系統性能分析
論文名稱(外文):Performance Analysis of Random Complementary Code BasedMIMO-CDMA System
指導教授:陳曉華陳曉華引用關係
指導教授(外文):Hsiao-Hwa Chen
學位類別:碩士
校院名稱:國立中山大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:192
中文關鍵詞:互補碼分碼多工系統
外文關鍵詞:Complementary codeCDMA
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在本論文中,我們針對時空區塊碼(Space-Time Block Code, STBC)編碼技術使同一個用戶間的天線是可分的與隨機互補碼(Random Complementary Code, RCC) 使不同用戶間是可分。並對時空區塊碼(Space-Time Block Code, STBC)編碼技術與隨機互補碼(Random Complementary Code, RCC)分碼多工(Code Division Multiple Access, CDMA)系統的整合架構做分析。此種整合架構有如下的特性
(1) 時空編碼技術可以透過多天線的配置結合編碼技術,可以在接收端提高接收訊號的天線分集,而隨機互補碼分碼多工技術可以擁有互補碼的完美相關特性下,在接收端降低訊號所受到的干擾,而兩者整合後的系統可以同時具有時空編碼技術的與隨機互補碼分碼多工技術的特性。
(2) 由於隨機互補碼是利用碼與碼之間的相關值互補特性來達到干擾消除,本論文中透過多載波的方式來實現隨機互補碼分碼多工技術,進而達到不僅僅是分用戶,同時兼具分天線的效果與干擾消除。因此設計兩種接收端(Receiver),訊號合成式接收端(Signal Synthesis Receiver)與分天線式接收端(Distributed Antennas Receiver)。考慮在單一路徑的情況下,可以因為碼彼此間的正交達道零干擾的效果。然而,多路徑情況的頻率選擇性衰減通道中,使用多載波的隨機互補碼分碼多工系統在不同頻率上所造成的不同的通道響應破壞了隨機互補碼的碼結構,使得干擾無法有效地消除。
(3) 隨著用戶數的增加,在完全相關的子載波通道的情況下,系統的效能絲毫不受影響,但在完全獨立的子載波通道的情況下,系統的效能隨著用戶數增加而降低。同時在可解析的路徑數越多的情況下,完全相關的子載波通道的效能會因為能夠有效地利用到無干擾的多路徑分集增益,因此其性能逐漸優於完全獨立的子載波通道環境下的性能。同時我們將系統的參數變化至更加一般化,並嘗試分析出不同參數環境下系統的效能最佳值。
This is a research on Performance Analysis of Random Complementary Code Based MIMO-CDMA System. In the first instance we discuss the produce method of random complementary codes by the basic matrix and pole matrix. Pole matrix is the produce method of Walsh Hadamard matrix. We discuss the properties of random complementary codes by the pole matrix and realize its auto-correlation and cross-correlation are perfect. Apply random complementary codes on Distributed Users and Antennas. Random complementary codes have the ideal auto-correlation and cross-correlation by way of direct-sequence spreading system, so it can solve multi-path interference and multi-access interference effectively. Apply Space-Time Block Codes on Distributed time and Antennas in the same user. Systems combine RCC with STBC. I design STBC RCC-CDMA System and two receivers. We discuss Signal Synthesis Receiver and Distributed Antennas Receiver with Rayleigh fading channel.

In Chapter 2, we start to introduce random complete complementary codes and its property to resist interferences in different transmission. Chapter 3 is the introduction Performance Analysis of Random Complementary Code Based MIMO-CDMA System with full correlated Rayleigh fading channel. Chapter 4 is the introduction Performance Analysis of Random Complementary Code Based MIMO-CDMA System with multi-path Rayleigh fading channel. Chapter 5 is the introduce conclusion and to research a goal in the future.
Abstract--------------------------------------------------------------------------------------------------------------------------------------I
中文摘要------------------------------------------------------------------------------------------------------------------------------------II
誌謝------------------------------------------------------------------------------------------------------------------------------------------III
目錄-----------------------------------------------------------------------------------------------------------------------------------------IV
變數列表----------------------------------------------------------------------------------------------------------------------------------VII
圖、表目錄-------------------------------------------------------------------------------------------------------------------------------XI
第一章 導論-------------------------------------------------------------------------------------------------------------------------------1
1.1研究動機-------------------------------------------------------------------------------------------------------------------------------1
1.2論文架構-------------------------------------------------------------------------------------------------------------------------------2
1.3系統基本架構------------------------------------------------------------------------------------------------------------------------2
1.3.1時空區塊碼-------------------------------------------------------------------------------------------------------------------------2
1.3.2 互補碼運作原理------------------------------------------------------------------------------------------------------------------4
第二章 隨機互補碼----------------------------------------------------------------------------------------------------------------------9
2.1前言-------------------------------------------------------------------------------------------------------------------------------------9
2.2隨機互補碼產生方式---------------------------------------------------------------------------------------------------------------9
2.2.1用戶數為2的隨機互補碼產生方式------------------------------------------------------------------------------------------9
2.2.2用戶數為4的隨機互補碼產生方式-----------------------------------------------------------------------------------------12
2.3隨機互補碼正交互補特性證明------------------------------------------------------------------------------------------------18
2.3.1隨機互補碼在二位元情況下的正交互補特性證明--------------------------------------------------------------------18
2.3.2隨機互補碼的正交互補特性證明------------------------------------------------------------------------------------------22
2.4基本矩陣的探討-------------------------------------------------------------------------------------------------------------------33
2.4.1取得最佳的隨機值--------------------------------------------------------------------------------------------------------------34
第三章 空時直接序列式隨機互補碼分碼多工系統於單一路徑之完全相關Rayleigh衰減通道-----------------42
3.1前言-----------------------------------------------------------------------------------------------------------------------------------42
3.2系統架構圖--------------------------------------------------------------------------------------------------------------------------42
3.3系統分析-----------------------------------------------------------------------------------------------------------------------------48
3.3.1系統各個部分分析-------------------------------------------------------------------------------------------------------------48
3.3.1.1 STBC Decoder--------------------------------------------------------------------------------------------------------------48
3.3.1.2隨機互補碼--------------------------------------------------------------------------------------------------------------------50
3.3.1.3 QPSK Modulator------------------------------------------------------------------------------------------------------------51
3.3.1.4傳送訊號分析-----------------------------------------------------------------------------------------------------------------52
3.3.1.5通道模型-----------------------------------------------------------------------------------------------------------------------53
3.3.2訊號合成式接收端-------------------------------------------------------------------------------------------------------------53
3.3.2.1沒有多重路徑干擾下的接收訊號---------------------------------------------------------------------------------------54
3.3.2.2 QPSK Demodulator--------------------------------------------------------------------------------------------------------54
3.3.2.3 STBC Decoder的輸入端-------------------------------------------------------------------------------------------------56
3.3.2.4 STBC Decoder的輸出端-------------------------------------------------------------------------------------------------59
3.3.3分天線式接收端-----------------------------------------------------------------------------------------------------------------61
3.3.3.1分天線式接收端(未加Symbol Interchange的部分)-----------------------------------------------------------------61
3.3.3.2 STBC Decoder的輸入端(未加Symbol Interchange的部分)----------------------------------------------------62
3.3.3.3 STBC Decoder的輸出端(未加Symbol Interchange的部分)----------------------------------------------------66
3.3.3.4分天線式接收端加入Symbol Interchange-----------------------------------------------------------------------------67
3.3.3.5 STBC Decoder的輸入端(加入Symbol Interchange)--------------------------------------------------------------68
3.3.3.6 STBC Decoder的輸出端(加入Symbol Interchange)--------------------------------------------------------------69
3.4 理論分析---------------------------------------------------------------------------------------------------------------------------70
3.4.1分析結果--------------------------------------------------------------------------------------------------------------------------70
3.4.2雜訊方差--------------------------------------------------------------------------------------------------------------------------73
3.4.3 SNR分析------------------------------------------------------------------------------------------------------------------------75
3.4.4 BER分析-------------------------------------------------------------------------------------------------------------------------76
3.5 理論結果圖-------------------------------------------------------------------------------------------------------------------------81
第四章 空時直接序列式隨機互補碼分碼多工系統於多路徑Rayleigh衰減通道------------------------------------85
4.1前言----------------------------------------------------------------------------------------------------------------------------------85
4.2系統架構圖-------------------------------------------------------------------------------------------------------------------------85
4.3系統分析----------------------------------------------------------------------------------------------------------------------------91
4.3.1系統各個部分分析-------------------------------------------------------------------------------------------------------------91
4.3.1.1 STBC Decoder--------------------------------------------------------------------------------------------------------------91
4.3.1.2隨機互補碼--------------------------------------------------------------------------------------------------------------------92
4.3.1.3 QPSK Modulator------------------------------------------------------------------------------------------------------------93
4.3.1.4傳送訊號分析-----------------------------------------------------------------------------------------------------------------95
4.3.1.5通道模型(Channel Model)------------------------------------------------------------------------------------------------96
4.3.1.6通訊系統的正規化(normalize)-------------------------------------------------------------------------------------------97
4.3.1.7隨機互補碼經過多路徑通道----------------------------------------------------------------------------------------------98
4.3.2訊號合成式接收端-------------------------------------------------------------------------------------------------------------99
4.3.2.1沒有多重路徑干擾下的接收訊號----------------------------------------------------------------------------------------99
4.3.2.2多重路徑干擾下的接收訊號--------------------------------------------------------------------------------------------100
4.3.2.3 QPSK Demodulator------------------------------------------------------------------------------------------------------102
4.3.2.4 STBC Decoder的輸入端------------------------------------------------------------------------------------------------104
4.3.2.5 STBC Decoder的輸出端------------------------------------------------------------------------------------------------114
4.3.3分天線式接收端---------------------------------------------------------------------------------------------------------------115
4.3.3.1 STBC Decoder的輸入端(加入Symbol Interchange)------------------------------------------------------------115
4.3.3.2 STBC Decoder的輸出端(加入Symbol Interchange)------------------------------------------------------------125
4.4理論分析--------------------------------------------------------------------------------------------------------------------------126
4.4.1分析結果------------------------------------------------------------------------------------------------------------------------126
4.4.2雜訊方差------------------------------------------------------------------------------------------------------------------------130
4.4.3 SNR分析------------------------------------------------------------------------------------------------------------------------131
4.4.4 BER分析------------------------------------------------------------------------------------------------------------------------134
4.5理論結果圖------------------------------------------------------------------------------------------------------------------------140
第五章 結論與未來展望------------------------------------------------------------------------------------------------------------145
附錄A雜訊的方差推導-------------------------------------------------------------------------------------------------------------147
附錄B證明任意兩個均值為零的複數隨機變數,其變異數乘機可拆成個別變異數相乘-----------------------148
附錄C任意複數的變異數與共軛複數的變異數相等-----------------------------------------------------------------------150
附錄D說明將訊號合成式接收器的平均錯誤率利用Q-function乘上動差生成函數去積分----------------------151
附錄E說明分天線式接收器(加入Symbol Interchange的部分)的平均錯誤率利用Q-function
乘上動差生成函數去積分---------------------------------------------------------------------------------------------------------153
附錄F證明利用互補碼特性簡化兩個接收器幹擾的部分-----------------------------------------------------------------154
附錄G由高斯近似法得到干擾方差---------------------------------------------------------------------------------------------171
參考文獻--------------------------------------------------------------------------------------------------------------------------------174
作者簡歷--------------------------------------------------------------------------------------------------------------------------------176
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