CODE DISTRIBUTION MULTIPLE ACCESS COMMUNICATION SYSTEM WITH USER VOICE ACTIVATED CARRIER AND CODE SYNCHRONIZATION

摘要

A communication system comprising a master control station and user terminals, in which synchronization in the outward link is achieved by transmitting a master code with the same clock frequency and carrier as the communication signals, wherein the master code is transmitted continuously and with greater power than that of the return link signals, and wherein the user voice activated message transmission carrier is broken during the pauses in a message. The invention relates in particular to a mobile satellite communications system.