Artech House Mobile Communications

By: John Doble

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Hardcover | 1 September 1996

At a Glance

Hardcover
216 Pages

Dimensions(cm)
24.13 x 15.88 x 1.27

Hardcover

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Gain a better understanding of the propagation effects you?re likely to encounter when working in fixed-link and mobile radio systems with this clear, practical guide. Without relying on complex explanations and obscure theory, the author first explores fixed-link propagation and then relates those concepts to the more complex situations you face in the mobile environment. You learn how and why propagation occurs, and discover useful techniques for minimizing transmission degradation and optimizing signal performance.

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Non-Fiction Engineering & Technology Electronics & Communications Engineering Electronics Engineering Microwave Technology Communications Engineering & Telecommunications Radio Technology

Acknowledgments	p. xiii
Introduction	p. xv
Fixed-Link Systems	p. 1
Radio Refractive Index	p. 3
Introduction	p. 3
Background to Microwave Radio Links	p. 3
Sea Level Value of RRI and Its Variation With Height	p. 7
The Measurement of RRI	p. 8
Radiosondes	p. 8
Refractometers	p. 8
RRI Profiles	p. 10
Deviations From the Normal Lapse Rate	p. 11
Subrefraction	p. 11
Superrefraction	p. 13
The Common Causes of the Lapse-Rate Deviations	p. 13
Summary	p. 15
References	p. 16
Fading on Microwave Systems	p. 17
Introduction	p. 17
The Mechanics of Fading	p. 17
Multipath Fading	p. 19
Mean-Depression Fading	p. 22
The Effect of Fading on System Performance	p. 25
Analog Systems	p. 25
Digital Systems	p. 25
The Effect of Fading on Antenna Performance	p. 29
Summary	p. 32
References	p. 33
The Use of Diversity to Reduce System Performance Degradation	p. 35
Introduction	p. 35
Frequency Diversity	p. 36
Space Diversity	p. 36
The Effect of Space Diversity on the Severity Of Narrowband Fading	p. 40
Angle Diversity	p. 43
Relative Merits of the Three Types of Diversity	p. 44
Summary	p. 44
References	p. 45
Propagation-Induced Interference	p. 47
Introduction	p. 47
Adjacent Channel Interference	p. 48
Cochannel Interference	p. 49
Bad Route Planning	p. 49
Failure to Account for Other Routes in the Same Country	p. 49
Failure to Carry out International Coordination Procedures	p. 49
Degradation of XPD in a Cofrequency, Cross-polar Frequency Plan	p. 51
Nodal-Point Interference	p. 51
Summary	p. 52
References	p. 53
Rain Attenuation and Molecular Absorption	p. 55
Introduction	p. 55
Polarization and Frequency Sensitivity of Rain Attenuation	p. 56
Sources of Rain-Rate Data	p. 56
Using Rain-Rate Data to Calculate Path Attenuation	p. 57
The Prediction of Rain Attenuation	p. 59
The United Kingdom Model	p. 59
The CCIR Model	p. 60
Comparative Calculation	p. 62
Polarization Scaling	p. 63
Path Diversity	p. 64
Molecular Absorption	p. 64
Summary	p. 66
References	p. 67
System Outage Modeling	p. 69
Introduction	p. 69
CCIR Performance Objectives for Analog Systems	p. 69
Multipath Prediction Models	p. 73
The United Kingdom Model	p. 73
CCIR Prediction Models	p. 74
CCIR Performance Objectives for Digital Systems	p. 78
Availability Objectives	p. 79
System Signatures	p. 79
Performance Prediction Models for Digital Systems	p. 83
Net-Fade Margin	p. 83
Inband Amplitude Dispersion	p. 84
Signature-based Models	p. 84
Summary	p. 87
References	p. 88
System Planning	p. 89
Introduction	p. 89
Basic Transmission Information	p. 90
Free-Space Transmission Loss	p. 90
Link Budget	p. 91
Diffraction Fading and Fresnel-Zone Clearance	p. 91
Ray Curvature as a Function of RRI Lapse Rate	p. 92
General Planning Concepts	p. 95
Multihop Links	p. 95
A Planning Exercise	p. 97
The Problem of Water Along the Route	p. 104
Summary	p. 106
References	p. 107
Mobile Systems	p. 111
Basic Mobile Propagation Topics	p. 111
Introduction	p. 111
The Different Types of Mobile Services	p. 112
Wide-Area Radio-Paging	p. 112
Display Paging	p. 112
Cordless Telephone (CT1)	p. 113
Cordless Telephone (CT2)	p. 113
Digital European Cordless Telephone (DECT)	p. 113
Telepoint	p. 114
Private Mobile Radio (PMR)	p. 114
Basic (Noncellular) Car-Phone System	p. 114
Analog Cellular	p. 114
Digital Cellular	p. 115
A General Discussion	p. 115
Basic Propagation	p. 117
VHF Propagation	p. 117
UHF Propagation	p. 119
EHF Propagation	p. 120
Antenna Effects	p. 120
Antenna Height	p. 120
Antenna Beam Shaping	p. 121
Radio Noise	p. 121
Summary	p. 121
References	p. 122
Prediction Methods, Models, and Measurements for Mobile Systems in Rural, Suburban, and Urban Locations	p. 123
Introduction	p. 123
Path-Loss Predictions at VHF and UHF	p. 124
Rural Areas	p. 124
Urban and Suburban Areas	p. 127
Path-Loss Predictions at the Lower Microwave Frequencies	p. 127
Rural Areas	p. 127
Urban and Suburban Areas	p. 128
Limits of Application	p. 132
Practical Measurements of Path Loss	p. 134
Delay Measurements	p. 135
Practical Measurement Techniques	p. 135
Results Presentation	p. 138
Summary	p. 140
References	p. 141
Propagation Aspects of Cellular Radio Systems	p. 143
Introduction	p. 143
The Evolution of Cellular Radio Systems	p. 144
A Basic Description of Analog Cellular Radio	p. 145
Cell and Cluster Sizes	p. 145
Logging On	p. 146
Handover	p. 146
Further Aspects	p. 147
Digital Cellular Systems	p. 147
Digital System Objectives	p. 147
Digital Speech	p. 148
Data Transmission	p. 149
Equalization	p. 149
Power Control	p. 149
Discontinuous Transmission	p. 150
Handover	p. 150
Carrier-to-Interference Ratio	p. 150
System Capacity Engineering	p. 150
Cost 231 Definitions of Cell Types	p. 152
Miscellaneous Topics	p. 153
Modeling of the Transmission Path	p. 153
Doppler Shift	p. 154
Fading Rates	p. 154
Diffraction Effects Over and Around Buildings	p. 154
Diversity Improvement	p. 155
Multipath Delay	p. 156
Summary	p. 156
References	p. 158
Communication Into and Within Buildings	p. 159
Introduction	p. 159
Background	p. 160
Building Penetration Loss	p. 161
Measurements	p. 161
Height Gain	p. 162
Measurement Techniques	p. 163
Inbuilding Losses	p. 163
Measurements	p. 163
Path-Loss Models	p. 163
Measurement Results	p. 165
Comments on Available Models	p. 166
Anomalous Experimental Results	p. 167
Penetration Loss Versus Frequency	p. 167
Height-Gain Factor	p. 168
Wall and Window Penetration Loss	p. 169
Summary	p. 170
References	p. 171
Propagation in Fixed and Mobile Systems--A Comparison	p. 173
Introduction	p. 173
Path Loss	p. 174
Fixed Links	p. 174
Mobile Systems	p. 174
Multipath and Mean-Depression Fading	p. 175
Fixed Links	p. 175
Mobile Systems	p. 176
Multipath Delays	p. 177
Fixed Links	p. 177
Mobile Systems	p. 177
Diversity	p. 177
Fixed Links	p. 177
Mobile Systems	p. 178
Frequency Reuse	p. 178
Fixed Links	p. 178
Mobile Systems	p. 179
Summary	p. 179
About the Author	p. 183
Index	p. 185
Table of Contents provided by Syndetics. All Rights Reserved.

Artech House Mobile Communications

At a Glance

Hardcover

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