PROCESS FOR SYNCHRONIZATION IN THE DOWNSTREAM OF MULTIPLE USERS IN A POINT TO MULTIPOINT SYSTEM WITH OFDM MODULATION

摘要

Method for synchronizing downlink multiple users in a system of point to multipoint transmission with OFDM modulation. Applicable in bidirectional communication via the electrical network between a headend and a plurality of users and allows synchronization both in time and frequency of multiple users in a communication system multicarrier OFDM Multiplexing (Orthogonal Frequency Division). It is characterized in that it comprises generating synchronization sequences using two identical synchronization symbols (16), which are transmitted periodically from the header on the downlink to the users, to estimate and correct the sampling frequency and simultaneously estimate the moment starting each OFDM symbol.