直接序列分碼多工存取技術用於陸地行動通訊系統之效能分析

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蘇文珀(Wen-Po Su) 查詢紙本館藏

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論文名稱

直接序列分碼多工存取技術用於陸地行動通訊系統之效能分析
(Performance analysis of DS-CDMA terrestrial mobile communication systems)

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摘要(中)

本論文對於DS-CDMA行動通訊系統之誤碼率有一整體及連貫之分析。先從接收信號振幅之觀點出發，在非同步傳輸無衰減通道下，推導出以鞍點法計算的誤碼率表示式；再進一步計算在具有多路徑衰減特性的通道環境下，以空間分集式接收的效能﹔衰減通道統計模型方面，以較具有彈性的Nakagami-m機率分布討論之；數值積分結果顯示接收機輸出分布的非高斯特性，特別是在嚴重衰減環境下，鞍點近似有令人滿意的精確度，可快速精確地評估系統之各參數。系統採用最大長度碼和金碼做為例子。
以接收信號功率的統計特性，推導出訊號對干擾加上白雜訊之比(SIR)，分析蜂巢式CDMA行動通訊系統在Rayleigh 衰減通道中之上傳鏈結和下傳鏈結之效能。分析中對於傳輸距離損失，屏蔽效應，多路徑衰減以及多數使用者所造成的干擾和白雜訊等均加以考慮。當傳輸通道考慮具有指數衰減形式之多路徑強度廓面時，以無限多條路徑取代事先決定之有限條路徑來加以分析。對於寬頻服務CDMA系統，為了達到可變的多重傳輸速率，在下傳鏈結環境下，所採用的短正交碼結合長隨機碼，以及上傳鏈結採長隨機碼，本文亦分別推導其SIR的機率分布及誤碼率的表示式。兩種RAKE接收機─等增益合併和選擇性合併，於此加以討論。

摘要(英)

The performance of a direct sequence code-division multiple-access (DS-CDMA) communication system is analyzed from two perspectives: received signal envelope and received power. With the envelope viewpoint, the BER can be accurately computed by using the saddlepoint method and the accuracy of Gaussian approximation (GA) can be assessed. The channel model is an additive white Gaussian noise (AWGN) channel subject to Nakagami fading, which can be characterized by the parameter m for various physical environments, i.e. urban, suburban, or rural areas. The effects of the multiple access interference (MAI), self-interference (SFI), path fading, and AWGN are investigated. For diversity receptions, the Mth order selective combining is considered. Results of the numerical integration illustrate the non-Gaussian property of the receiver output distribution. Examples using maximal-length sequences and Gold codes are considered.
With the analysis of received power, detailed formulas in closed or approximate forms are presented for calculating the distribution of the received bit energy-to-total-
noise ratio. Both downlink and uplink are considered. No predetermined number of effective multipaths is required. It is decided during computation. The saddlepoint method can greatly reduce the calculation complexity to be linear with the number of interferers. Approximations are derived for a large processing gain and a MAI limited environment respective. Methods for computing the BER are shown for receivers with equal gain or selective combiners.

關鍵字(中)

★ 直接序列分碼多工存取
★ 屏蔽效應
★ 鞍點法
★ 多路徑衰減
★ 等增益合併
★ 選擇性合併

關鍵字(英)

★ DS-CDMA
★ saddlepoint method
★ multipath fading
★ equal gain combining
★ selective combining
★ shadowing

論文目次

Chapter 1 Introduction 1
1.1 Background and Motivation 1
1.2 Overview 4
1.3 Organization of the dissertation 6
Chapter 2 Performance of a DS-CDMA system through non-faded channels 7
2.1 Introduction 7
2.2 System model 9
2.3 The m.g.fog the receiver output statistic 11
2.4 The calculations of the BER 15
2.4.1 The Gaussian approximation 15
2.4.2 The BER floor 17
2.4.3 The saddlepoint method 18
2.4.3.1 Saddlepoint approximation 18
2.4.3.2 Numerical saddlepoint integration 20
2.4.3.3 Searching for the required SNR 21
2.5 Numerical results 23
2.6 Conclusions 29
Chapter 3 Performance of a DS-CDMA system through fading channels 30
3.1 Introduction 30
3.2 DS-CDMA system model 33
3.2.1 Transmitter model 33
3.2.2 Channel model 34
3.3 Receiver model 37
3.3.1 Nondiversity reception 37
3.3.2 Selection diversity 42
3.4 Performance analysis 46
3.4.1 Gaussian approximation 46
3.4.2 Saddlepoint method 48
3.4.2.1 Derivatives of the m.g.f 49
3.4.2.2 Integration through a saddlepoint 51
3.4.2.3 Saddlepoint approximation 54
3.5 Numerical results 55
3.6 Conclusions 63
Chapter 4 Uplink and downlink analysis of cellular radio systems 65
4.1 Introduction 65
4.2 Conditional SIR 68
4.2.1 Transmitted signal representation 68
4.2.2 Multipath channel model 70
4.2.3 Multipath rejection receiver output 72
4.3 Downlink performance analysis 75
4.3.1 Distribution of the conditional SIR 75
4.3.2 Models of locations of users 77
4.3.3 Path loss 78
4.3.4 Shadowing 79
4.3.5 System measures 80
4.3.6 RAKE receiver output 81
4.3.6.1 Equal gain combining 81
4.3.6.2 Selective combining 83
4.4 Uplink performance analysis 85
4.4.1 Distribution of the conditional SIR 85
4.4.2 Channel effects 87
4.4.3 Performance evaluations 88
4.4.3.1 Multipath rejection receiver 88
4.4.3.2 Equal gain combining receivers with PC 89
4.4.3.3 Selective combining receivers with PC 90
4.5 Numerical examples 91
4.5.1 Dowlink 91
4.5.2 Uplink 97
4.6 Conclusions 101
Chapter 5 Conclusions and Further research 102
Appendix A 104
Bibliography 111

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指導教授

賀嘉律(Chia-Lu Ho)

審核日期

2000-6-30

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