PROCEDIMENTO E APPARATO DI CANCELLAZIONE DEL SEGNALE DI RIENTRO IN UNRIPETITORE DI TIPO GAP FILLER PER RETI A SINGOLA FREQUENZA DVB-T.

摘要

The amplification chain in a relay station is provided with negative feedback by a FIR filter with controllable frequency response ( W ( f )), whereby the channel transfer function for each OFDM symbol is estimated and the filter transfer function is controlled so that the distorsions of the signal broadcast by the transmitting antenna are minimized. A preliminary procedure is then performed in which the relay's transmission is disabled while the reception is active and an estimation is made of the transfer function of the multiple paths reaching the receiver in addition to the main signal by computing H e ( f ) = F 0 ( f ) - 1, where F 0 ( f ) is the frequency response of the channel, and the FIR filter is then initialized with the function W 0 ( f ) = F 0 ( f ) - 1. The invention also concerns an apparatus with a simplified FIR filter.