CONTENTS

 1     Introduction      
 2     Design basis of digital system       
        2.1     System concept and application aspects     
        2.2     Voice coding techniques    
        2.3     Modulation techniques       
        2.4     FEC techniques     
        2.5     Standard B design example
 3     Low G/T, data only, system concept (Standard C)           
 4     Link budget considerations           
        4.1     Multipath fading characteristics       
        4.2     Pointing/tracking error characteristics         
        4.3     Link budget examples        
 5     Advanced areas of system design 
Annex 1 - Performance characteristics of a digital voice-grade ship earth station    
 1     System design   
 2     Results of field experiment [Yasuda et al., 1987]  
Annex 2 - Performance of an experimental low G/T ship earth station    
 1     Introduction      
Annex 3 - Enhanced group call system    
 1     Introduction      
 2     System description           
 3     Link budget
 4     Addressing techniques     
 5     Summary   
Annex 4 - Forward error control (FEC) as a means of multipath fading compensation    
Annex 5 - Inmarsat Standard C communications system    
 1     Introduction      
        1.1     Briefly the Standard C system is described as follows:        
        1.2     These techniques permit the following applications to be carried:     
 2     Design implications          
 3     Link budgets     
 4     Signal processing system  
        4.1     Signal processing features  
        4.2     Signal processing effects