DVB-T signal over cable TV network and phase noise requirements

We study the quality of the terrestrial digital video broadcasting (DVB-T) transmission over the cable TV network. Generally, when terrestrial digital TV signals are distributed in the cable TV. a conversion is needed in the head-end. from DVB-T (OFDM) to DVB-C (single carrier). In order to avoid th is costly conversion and to transmit DVB-T signal directly in the existent cable channel, many requirements have to be satisfied. It is known that pha se noise represents tile main limitation for OFDM based systems. In this co ntribution we demonstrate the sensitivity of the OFDM system for the phase noise effects by using a dynamic model for CATV channel. Then, we conclude by giving the specifications that a converter in the CATV network should ha ve to still allow the functionality of the DVB-T system.