Ofdm receiving device and ofdm receiving method

THE TIME REQUIRED FOR SWITCH THE CHANNEL CAN BE REMARKABLY CURTAILED . WHEN BROADCASTING SIGNALS THROUGH A PLURALITY OF INFORMATION CHANNELS WITH AN OFDM SYSTEM , THE PLURALITY OF INFORMATION CHANNELS ARE MULTIPLEXED IN THE SENSE OF FREQUENCY AND COLLECTIVELY SUBJECTED TO IFFT MODULATION FOR CONNECTED TRANSMISSION INSTEAD OF SUBJECTING THE PLURALITY OF INFORMATION CHANNELS INDEPENDENTLY TO OFDM MODULATION OR TRANSMISSION . WITH THIS ARRANGEMENT , THE EFFICIENCY OF EXPLOITATION OF FREQUENCIES IS IMPROVED . ACCORDING TO THE INVENTION , THE OFDM FRAMES ARE SYNCHRINIZED FOR EACH INFORMATION CHANNEL FOR THE PURPOSE OF CONNECTED TRANSMISSION . THEN , THE OFDM RECEIVER CAN SWITCH THE INFORMATION CHANNEL FOR SIGNAL RECEPTION , MAINTAINING THE FRAME SYNCHRONIZING SIGNALS.(FIG 16)