A novel method of determining EWS wake-up trigger for ISDB-T digital television receivers

ISDB-T (Integrated Services Digital Broadcasting-Terrestrial) digital television broadcasters would send a special signal to wake up receivers when an emergency alert is advised. The wake-up procedure is defined as EWS (Emergency Warning System) and the trigger is sent in a single bit of the control message called TMCC (Transmission and Modulation Configuration Control). Wrong determination of the trigger leads to a false alarm and increases power consumption while idle. In this paper, a method of determining the EWS wake-up trigger is proposed by assuming the broadcasters do not change TMCC message except for the trigger when the broadcaster advises an emergency alert. For reducing the false alarm, this paper proposes using the TMCC parity for the reliable determination of the trigger. Results showed the proposed method was almost free from a false alarm.