Patent ID: 6222828
Filing Date: 2001-04-24
Classification: H04B,H04J,H04L,H04W,Y02D

Abstract:
A method of providing a satellite based telecommunications link between earth stations and terminals via satellites, said method comprising:maintaining forward and return communications channels over forward and return communications links, respectively, between earth stations and terminals, via satellites;utilizing orthogonal CDMA codes to maintain forward communications links for multiple terminals synchronous with one another;utilizing orthogonal CDMA codes to maintain return communications links from multiple terminals synchronous with one another at a common earth station;measuring and calculating, at the earth station, chip timing error correction information for said return communications links based on a sync field in said communications links;transmitting, to a terminal, said chip timing error correction information over a loop signaling channel; andupdating, at the terminal, chip timing error using said chip timing error correction information received.