Detection of emergency wake-up trigger signal with TMCC parity and subcarrier frequency diversity for ISDB-T digital television receivers

When emergency alert is advised, some digital television broadcasters would send a special control signal to wake up receivers. In ISDB-T (Integrated Services Digital Broadcasting- Terrestrial) digital television standard, the special control signal is referred to as TMCC (Transmission and Modulation Configuration Control). It is capable of handling such emergency wake up and is also used for identifying the transmission parameters such as the modulations and coding rates. Because the transmission parameters are usually fixed, the use of the parity in the special control signal has been proposed for detecting emergency wakeup trigger. Though the parity method reduces the false alarm probability, it offers the same misdetection probability as the conventional wake-up trigger detection. Therefore, in this paper, the frequency diversity as well as the parity is used for further reducing the misdetection probability. The result showed the proposed combination of the parity detection and the frequency diversity complementary reduced probabilities both of the false alarm and the misdetection.