OFDM (orthogonal frequency division multiplexing)-based high-speed rail mobile communication method and system

The invention discloses an OFDM (orthogonal frequency division multiplexing) modulation-based high-speed rail mobile communication method and system. An RRU (radio remote unit) is arranged in a train compartment, and the RRU is communicated with a far-end machine room by a power line connected with a train; the communication between the machine room and the far end of the RRU adopts an OFDM modulation mode; along with an up direction, a signal which is transmitted by a mobile station is transmitted to the far end of the RRU by means of OFDM, is converted by means of down-conversion and D/A (digital-to-analogy) conversion, is coupled to the power line to be transmitted, and is subjected to base band processing in the far-end machine room; and along with a down direction, the machine room is used for modulating a baseband signal into an OFDM signal, wherein the OFDM signal is coupled to the power line to be transmitted, is received at a radio remote end of a base station, is converted by means of A/D (analogy-to-digital) conversion and up-conversion, and is transmitted to the mobile station by the radio remote end of the base station, so that the voice/data communication can be realized.