Field trial of relay SFN for digital terrestrial television broadcasting

摘要

ISDB-T which used OFDM modulation was adopted for Digital Terrestrial Television Broadcasting system in Japan, because it has advantage against multipass. The re-transmitting signal is degraded by the coupling-multipass interference from transmitting antenna to receiving antenna. We have been developing the loop canceller to cancel the coupling-multipass interference. This paper describes outline of field trial results at the Otaru relay station. In the trial, we propose that the coupling-multipass interference is extimated by the delay profile of coupling-multipass.