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Title page

Abstract

Contents

Chapter 1. Introduction 13

1.1. UWB system 13

1.2. UWB channel standard model 14

1.2.1. IEEE 802.15.3a 14

1.2.2. IEEE 802.15.4a 14

1.3. Motivation 15

1.4. Dissertation Outline 17

Chapter 2. Modeling of UWB channel with Population density in indoor LOS Environments 18

2.1. Introduction 18

2.2. Measurement methodology 20

2.2.1. Measurement system 20

2.2.2. Measurement Scenario 21

2.3. Frequency Correlation Coefficient of the Measured Channel Gains 24

2.4. Path-Loss Characteristics 27

2.4.1. Empirical distance-dependent path-loss model 27

2.4.2. Empirical frequency-dependent path-loss model 30

2.5. Time-Dispersion Parameters 34

2.6. Conclusions 38

Chapter 3. Human Body Affected Small-Scale Fading for Indoor UWB channel 39

3.1. Introduction 39

3.2. Measurement Campaign 40

3.2.1. Measurement system 40

3.2.2. Measurement scenario 40

3.3. Statistical Modeling of Small-Scale Fading 47

3.4. Small-Scale Fading Distribution by Body 49

3.5. Conclusions 60

Chapter 4. Performance Analysis of Rake receiver in IR-UWB system 61

4.1. Introduction 61

4.2. UWB Rake Receiver 63

4.2.1. UWB Rake receiver structure 63

4.2.2. Rake Receiver Type 66

4.3. Channel models 68

4.3.1. 801.15.4a UWB channel model 68

4.3.2. People Shadowing Effect on UWB Channels 70

4.4. BER performance analysis 72

4.5. Conclusion 78

Bibliography 79

초록 82

List of Tables

Table 1.1. Typical environment and ranges for UWB applications 13

Table 2.1. Size, Area, Max. No. of people, and Main features 22

Table 2.2. Empirical Distance-dependent Path-loss Parameters 28

Table 2.3. Empirical Frequency-dependent Path-loss Parameters 32

Table 3.1. Size and Main Features of all Environments 41

Table 3.2. Passing Rate For The Scenarios In The Absence of Human Body 51

Table 3.3. Passing Rate For The Scenarios In The Presence of Human Body 51

Table 3.4. The parameters of the exponential fit for λ 57

Table 3.5. The parameters of the Lognormal fit for K(이미지참조) 59

Table 4.1. Main Difference of Channel Models 73

List of Figures

Figure 2.1. Block diagram of the measurement system 20

Figure 2.2. Floor plans for (a) no people and (b) 10 people in B environment. 23

Figure 2.3. Correlation Coefficient with Δf in (a) Environment A, (b)... 26

Figure 2.4. (a) Path-loss exponent n and (b) σ𝑑. 29

Figure 2.5. Methods for obtaining frequency-dependent path-loss model 31

Figure 2.6. (a) Path-loss exponent k and (b) σ𝑓. 33

Figure 2.7. (a) Mean excess delay and (b) RMS delay spread 36

Figure 2.8. Normalized power delay profile in (a) B and (b) D environment 37

Figure 3.1. Floor plans for (a) Environment 1, (b) Environment 2, (c) Environment 3, (d)... 46

Figure 3.2. Typical the normalized power delay profile of a sample data file for... 49

Figure 3.3. CDFs of passing rate of Weibull distribution for (a) K-S and (b)...(이미지참조) 52

Figure 3.4. CDFs of the empirical small-scale fading amplitude fitted with... 53

Figure 3.5. λ with delay time and its regression model fitted with the exponential... 56

Figure 3.6. CDF of K and their regression model fitted with Lognormal distribution in...(이미지참조) 58

Figure 4.1. A Rake receiver structure 65

Figure 4.2. Principle of (a) SC-Rake and (b) PC-Rake receiver 67

Figure 4.3. (a) Computation of blocking angular range and (b) Power... 71

Figure 4.4. BER with the number of fingers for (a) SC-Rake receiver and... 75

Figure 4.5. BER performance of a 10-finger (a) SC-Rake receiver and... 77

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