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研究生:林聖峰
研究生(外文):Sheng-Fong Lin
論文名稱:於M準位移頻鍵送跳頻多重進接系統中之干擾消除技術研究與效能分析
論文名稱(外文):Research on Interference Cancellation and Performance Analysis for MFSK/FH-SSMA Systems
指導教授:溫志宏溫志宏引用關係
指導教授(外文):Jyh-Horng Wen
學位類別:碩士
校院名稱:國立中正大學
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:2001
畢業學年度:89
語文別:英文
論文頁數:72
中文關鍵詞:跳頻碼同頻干擾多用戶檢測架構
外文關鍵詞:Hopping PstternCochannel Interference (CCI)Multiuser Detection Scheme
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近年來,無線通訊系統的發展已可提供高的資料傳輸速率並應用到更複雜的架構中。其中,展頻多工系統已成為無線科技中一項引人矚目的技術。在展頻多工系統中,系統用戶可以隨時使用系統所提供的頻寬,而不需做任何時間或頻段的調配進而達到有效使用頻寬的目的。展頻多工系統包含直接序列展頻多工系統以及跳頻展頻多工系統兩種基本的架構。在本論文中,將對跳頻展頻多工系統做較深入的探討。
由於跳頻系統頻率變化之多樣性,跳頻展頻多工通訊系統被廣泛的用來抵抗多路徑之衰減。但多用戶之間的頻率干擾將使得系統用戶容量受到限制,因此許多用來解決多用戶干擾的方法被提出並且作廣泛的研究。在本篇論文中,我們提出一個新的多用戶偵測演算法則並使用於此系統中,用來抵銷多用戶干擾,藉以增加跳頻展頻多工系統的用戶容量。在此同時,此新的演算法則亦針對此系統的接收機解碼複雜度上加以考量。最後,我們將所提出的架構之系統模擬分析結果與傳統及過去提出的多用戶干擾抵銷系統作比較。結果顯示所提出的架構除了可使系統用戶容量增加之外更具備了降低系統複雜度的雙項優點。

Recently, the wireless communication systems have been developed that can support high data rate and more ophisticated
applications. Spread-spectrum multiple access (SSMA), has become an attractive technique in the wireless technologies.
In an SSMA system, many users can be allowed to share the same frequency band simultaneously and can achieve efficient bandwidth utilization. There are two basic types of SSMA techniques, namely direct-sequence SSMA (DS-SSMA) and frequency-hopping SSMA (FH-SSMA). We will focus on the FH-SSMA systems in this thesis. FH-SSMA wireless communication systems have gained much interest recently because of its frequency diversity and resistance to the near-far problem. Cochannel interference (CCI) is one of the dominant factors which results in reduced
user capacity. Various techniques used to resolve the CCI problem have been extensively investigated. In this thesis, a novel algorithm is proposed by us to improved iterative
interference cancellation scheme and further increase user capacity in the multilevel frequency-shift keying (MFSK)/FH-SSMA systems. Besides, the reduction for the complexity of the receiver is also considered in the new proposed algorithm. Finally, the performance of systems with the proposed interfer-ence cancellers are simulated and compared with those of the conventional and other interference cancellers. From the results, it shows that the new proposed scheme will further improve the system performance and greatly reduce the complexity of the system.

Table of Contents
Abstract in Chinese ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ i
Abstract in English ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ ii
Table of Contents  ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ iii
List of Figures   ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ v
List of Table    ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ vii
1. Introduction ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 1
1.1. Introduction to CDMA Systems ﹍﹍﹍﹍﹍﹍﹍ 3
1.1.1 Overview of DS-SSMA System ﹍﹍﹍﹍﹍ 5
1.1.2 Overview of FH-SSMA System ﹍﹍﹍﹍﹍ 6
1.2. Organizations and Motivation of Thesis ﹍﹍ 8
2. MFSK/FH-SSMA System with Multiuser Detection Schemes 12
2.1.Introduction ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 12
2.2System Description ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 12
2.2.1. Address (Hopping) Pattern Assignment ﹍ 16
2.2.2. Conventional Detection Scheme ﹍﹍﹍﹍ 21
2.3Multiuser Detection Schemes ﹍﹍﹍﹍﹍﹍﹍﹍ 24
2.3.1. Mabuchi’s Scheme ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 24
2.3.2. Lin’s Scheme ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 28
2.4.Performance Analysis ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 31
2.4.1. Conventional Canceller ﹍﹍﹍﹍﹍﹍﹍﹍ 32
2.4.2. Mabuchi’s CCI Canceller ﹍﹍﹍﹍﹍﹍﹍ 35
2.4.3. Lin’s CCI Canceller ﹍﹍﹍﹍﹍﹍﹍﹍ 37
2.5.Analysis of System Complexity ﹍﹍﹍﹍﹍﹍﹍﹍ 38
3. MFSK/FH-SSMA System with Low Complexity CCI Canceller 42
3.1.Introduction ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 42
3.2.System Description of Proposed Scheme ﹍﹍﹍﹍ 43
3.2.1 Proposed Multiuser Detection Scheme ﹍ 45
3.3.Analysis of System Complexity ﹍﹍﹍﹍﹍﹍﹍﹍ 53
4. Numerical and Simulation Results ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 56
4.1.Analysis of Bit Error Rate ﹍﹍﹍﹍﹍﹍﹍﹍﹍ 56
4.2.Analysis of System Complexity ﹍﹍﹍﹍﹍﹍﹍﹍ 58
5. Conclusions and Future Works ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 69
Appendix A ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 70
References ﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍﹍ 72

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