抄録
In a relay SFN of digital terrestrial broadcasting, coupling effects from transmitting signal to receiving signal in a relay station should be reduced and suppressed to the level needed for stable operation. In order to study countermeasures against the coupling, it is necessary to measure accurately the coupling in various kinds of relay stations. We propose a measuring method of the coupling using the GCR signal multiplexed in TV signals on the air. In this method, a transfer function of the coupling path between transmitting and receiving antenna of a relay station is calculated from the GCR signals measured in both sides. Delays and amount of coupling signals can be gotten from the transfer function. The usefulness of the method is verified with the result of computer simulation and laboratory experiments. The data measured by the method in some relay stations are also shown.
