Mobile Channel Characteristics

✍ Scribed by James K. Cavers

• Publisher: Springer
• Year: 2000
• Tongue: English
• Leaves: 237
• Series: international series in engineering and computer science 555
• Edition: 1
• Category: Library

✦ Synopsis

Mobile Channel Characteristics introduces the principal transmission phenomena of mobile and personal communication - the ones that affect design of modems, channel simulators, smart antennas, and other system components at the physical level. It is designed to be accessible to senior undergraduates, as well as graduate students and working engineers. The treatment parallels mathematical derivations with intuitive explanations and simple approximations in order to develop the reader's understanding of the phenomena. Because of this strong tutorial flavor, the text is also suitable for those entering the area from a different academic discipline. Mobile Channel Characteristics was conceived and written as an interactive text to be viewed on a computer screen. It includes many features not found in conventional texts: The entire text resides on your hard drive. It is always ready, just a mouse-click away; It is a live document. Try different parameter values, and the equations, tables and graphs recalculate as you watch. Animated graphics illustrate dynamics of the channel. Explore propagation, modulation or system models interactively to gain additional insight; The examples and appendices are `tear-off design sheets'. You can use their programs on the job or in your thesis to speed up your work; It links you to the world. Hyperlinks connect you to websites of cited authors, to online research journals, and to employers and graduate schools, all through the Internet. Mobile Channel Characteristics includes working programs for three different methods of channel gain generation for fading channel simulation, as well as working programs to illustrate their use. Mobile Channel Characteristics is an essential reference tool for practising engineers, researchers, academics, and students. It is a self-study text equally suited for classroom use.

✦ Table of Contents

Table of Contents......Page 10
1. PathLoss......Page 12
1.1 Plane earth model and inverse fourth power......Page 13
1.2 Implications for cellular design......Page 16
1.1A Detailed derivation of inverse fourth power......Page 22
2. Shadowing......Page 26
2.1 Statistical model of shadowing......Page 27
2.2 Shadowing and system design......Page 30
3. Fading and Delay Spread......Page 34
3.1 Physical basis of fading......Page 36
3.2 Mathematical model of fading......Page 39
3.3 Consequences: Doppler spread, delay spread and time-variant filtering......Page 42
3.4 Is it Flat or Frequency Selective? An Example......Page 47
4. First Order Statistics of Fading......Page 50
4.1 Gaussian models in time and frequency......Page 52
4.2 Rayleigh and Rice fading......Page 55
4.3 Consequences for BER......Page 62
4.4 Connecting Fading, Shadowing and Path Loss......Page 65
5. Second Order Statistics of Fading......Page 70
5.1 Doppler spectrum and WSS channels......Page 72
5.2 Power delay profile and US channels......Page 80
5.3 Scattering function and WSSUS channels......Page 88
5.4 A TDL channel model for analysis and simulation......Page 95
6. Connecting Fading Statistics With Performance......Page 102
6.1 Random FM and error floor......Page 103
6.2 Level crossing rate and error bursts......Page 109
7. A Gallery of Channels......Page 116
7.1 Macrocells......Page 117
7.2 Urban microcells......Page 121
7.3 Indoor picocells......Page 124
8. Differences between mobile and base station correlations......Page 126
8.1 Directionality at the Mobile - Doppler spread......Page 127
8.2 Directionality at the Mobile - delay spread......Page 135
8.3 Angular dispersion and directionality at the base......Page 137
9. Simulating Fading Channels......Page 148
9.1 Sampling and SNR......Page 149
9.2 Complex gain generation......Page 156
9.3 Importance sampling......Page 159
9.3A Effect of β on Variance in importance sampling......Page 168
Appendix A: The Lognormal Distribution......Page 172
Appendix B: A Jakes-Like Method of Complex Gain Generation......Page 176
Appendix C: Visualization of a Random Standing Wave......Page 186
Appendix D: Animation of Complex Gain, Fading and Random FM......Page 188
Appendix E: Animation of Time Varying Frequency and Impulse Responses......Page 192
Appendix F: Joint Second Order Statistics......Page 196
Appendix G: Joint Probability Density Functions in Polar Coordinates......Page 202
Appendix H: Generation of Complex Gain for Importance Sampling......Page 208
Appendix I: Linear Time Variant Filters......Page 212
Appendix J: Is the Channel Really Gaussian? An Experiment.......Page 216
Appendix K: The FFT and Overlap-Add Method of Complex Gain Generation......Page 220
References......Page 228
C......Page 234
L......Page 235
S......Page 236
W......Page 237