CONTENTS

Propagation data required for the design of Earth-space land mobile telecommunication systems     2
Policy on Intellectual Property Right (IPR)     ii
RECOMMENDATION  ITU-R  P.681-7     1
Propagation data required for the design of Earth-space  land mobile telecommunication systems     1
Annex 1     1
1 Introduction  1
2 Tropospheric effects  2
        2.1 Attenuation  2
        2.2 Scintillation  2
3 Ionospheric effects  2
4 Shadowing  2
        4.1 Roadside tree-shadowing model 2
                  4.1.1 Calculation of fading due to shadowing by roadside trees  2
                  4.1.2 Fade duration distribution model 5
                  4.1.3 Non-fade duration distribution model 5
        4.2 Roadside building-shadowing model 6
        4.3 Special consideration of hand-held terminals (user blockage) 8
        4.4 Modelling building blockage effects using street masking functions (MKF) 9
5 Multipath models for clear line-of-sight conditions  12
        5.1 Multipath in a mountain environment 14
        5.2     Multipath in a roadside tree environment 14
 6     Statistical model for mixed propagation conditions  16
        6.1 Prediction of fading statistics for a single satellite link  17
        6.2 Prediction of state duration statistics for a single link  20
7 Physical-statistical wideband model for mixed propagation conditions  21
        7.1 Model input 23
        7.2 Model output 23
        7.3 Model output usage  23
8 Satellite diversity  23
        8.1 Uncorrelated case  24
        8.2 Correlated case  24
                  8.2.1 Quantification of the shadowing cross-correlation coefficient in urban areas  24
                  8.2.2 Availability calculations  28
        8.3 Modelling satellite diversity effects using MKFs  29