Radio frequency transmission system and transmission method

The invention relates to the technical field of communication, in particular to a radio frequency transmission system and method, and the system mainly comprises an output device and a terminal device. The output equipment outputs a direct-current power supply signal, a control signal and a radio frequency signal, the control signal is modulated according to the direct-current power supply signal, and the direct-current power supply signal, the control signal and the radio frequency signal are combined and transmitted to next-stage equipment; and the terminal equipment receives the direct-current power supply signal transmitted by the upper-level equipment, stores and supplies power, receives the control signal transmitted by the upper-level equipment and opens the corresponding radio frequency channel according to the control signal, so that the received radio frequency signal can pass through and be transmitted. By directly modulating the control signal on the direct-current power supply signal, the complex