Algorithm 1 Emergency alert wake-up signal detection method

Input: The received 3072 complex samples Output: Wake-up 2 bits (00, 01, 10, and 11)

1: if bootstrap detection is False: 2:  go back to step 1 using next received 3072 complex samples 3: else: 4:  symbol time offset estimation and compensation 5.  acquisition of time-synchronized 2nd and 3rd bootstrap symbols 6:  demodulation emergency wake-up bits 7:  if any wake-up bit is 1: 8:   occur emergency disaster situations 9:   wake-up any connected device 10:   go back to step 6 and demodulation the next bootstrap symbols 11:  else: 12:   go back to step 6 and demodulation the next bootstrap symbols 13:  end if 14: end if