OFDM-based data transmission device

The invention discloses an OFDM-based data transmission device. A high-speed DSP and a corresponding software program are adopted for detecting and judging the operation situation of two mainframes and two channels, corresponding non-contact soft handover is carried out when a certain mainframe or channel breaks down, normal communication is not affected when any mainframe or channel breaks down, and meanwhile as a hardware switching circuit is omitted, safety and reliability of data transmission are greatly improved. Aiming at solving the problems that a power line carrier channel is large in noise and severe in interference, improving the impulse interference and narrow-band interference resistance capacity of data signal transmission to the maximum extent and effectively improving the utilization rate of a frequency band at the same time, the OFDM and the method realized by the DSP software are adopted, and the goal that signal transmission rate in bandwidth of 4 kHz on a power line reaches 9600 b/s is achieved.