车载自组织网络中车辆间信道仿真概述(PDF 75页)

Chapter 1 Introduction  1
1.1 Problem Statement .. 2
1.2 Thesis Structure . 3
Chapter 2 The Channel Model ... 4
2.1 Large-Scale Propagation Effects . 5
2.1.1 Free Space Path loss  5
2.1.2 Empirical Path Loss Models ... 6
2.1.3 Shadowing  6
2.1.4 The V2V Path Loss Model  7
2.2 Small-Scale Propagation Effects . 8
2.2.1 Signal Representation ... 8
2.2.2 Autocorrelation function and Power Spectrum ... 10
2.2.3 Mobile-to-Mobile Autocorrelation and Power Spectrum .. 12
2.2.4 V2V Power Spectrum . 14
2.2.5 The Signal Envelope ... 15
2.2.6 Empirical Channel Characterizations .. 16
2.3 Summary of V2V Channel Model . 17
Chapter 3 Simulating the V2V Channel Model .... 19
3.1 Background on Simulating a Fading Channel .... 19
3.1.1 Simulating a Nakagami Fading Channel .. 19
3.1.2 Simulating a Rayleigh Fading Channel .... 21
vii
3.2 The Simulation Method for the V2V Channel Model ..21
3.2.1 Overview .21
3.2.2 Computing the Nakagami Fading Envelope in the simulator..22
3.2.3 Generating the dataset .23
3.2.4 Using different Doppler Frequencies ...24
3.2.5 The algorithm ....24
Chapter 4 Implementation in the Network Simulator (NS-2) ..26
4.1 Overview 26
4.2 NS-2 Wireless Model Structure .26
4.3 The NS-2 Propagation Class 28
4.4 Class VanetProp ....29
4.4.1 Linking the C++ code to OTcl ...29
4.4.2 The Path Loss Model ..30
4.4.3 The Fading Model ..34
4.4.4 The Log-Normal Model ...37
4.4.5 The Returned Power Value ...38
Chapter 5 Simulation Results ...39
5.1 The Signal Power Envelope .39
5.2 Fading Probability Density Function ...42
5.4 The autocorrelation function 45
Chapter 6 Conclusion and Future Work 48
6.1 Future Work 48
viii
Appendix A Class VanetProp ... 50
Appendix B Generating the Dataset .. 58
Appendix C An NS-2 Simulation Scenario .. 59
References .... 61
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