 These are point-to-point communication links and not broadcast transmissions.The DVB-T signal is a Coded Orthaginal Frequency Divisional Multiplexing system or COFDM for short, but so is the cable (DVB-C) and Satellite (DVB-S).The DVB-T signal is implemented as QPSK QAM or Quadrature Phase Shift Keying and Quadrature Amplitude Modulation.The DVB-S signal is implemented as QPSK QFM or Quadrature Phase Shift Keying Quadrature Frequency Modulation.