The method includes following steps: (1) initial frequency selection;(2) based on modulation mode adopted, the sending end carries out symbol mapping, changes signal spectrum based on label information of sub channel, and sends signal in time domain; (3) based on label information of sub channel, the receiving end carries out equalization for received signal, demodulates signal and accomplishes judgment; (4) carrying out channel estimation or prediction, the receiving end obtains updated information of signal state, and determines whether label information of sub channel is needed to update based on self-adapting judgment rule. Ensuring precondition of system performance, the invention solves fading issues of frequency selection and time selection.