Data frame filling method for multi-modulation mode transmission system

The invention relates to a data frame filling method of multi-modulating modes transmission system, which selects the data processing mode through time domain / frequency domain; when no reference information is inserted into the single carrier wave time domain processing: data requiring single carrier wave time domain processing is under increased sampling; data requiring multi carrier wave frequency domain processing is under processing of interpolation of pilot signal / strongly protected unknown information, afterwards the output data is under processing of interpolation of virtual sub-carrier wave, and finally output under processing of interpolation of virtual sub-carrier wave is under IFFT processing; when reference information is inserted into the single carrier wave time domain processing, and the inserted reference information number L is equal to the inserted pilot signal / strongly protected unknown information number N: data requiring single carrier wave time domain processing is under processing of interpolation of reference information, inserted with reference information formed by L = N signs, and then output data under processing of interpolation of reference information is under increased sampling; data requiring multi carrier wave frequency domain processing is under processing of interpolation of pilot signal / strongly protected unknown information, afterwards the output data is under processing of interpolation of virtual sub-carrier wave, and finally output under processing of interpolation of virtual sub-carrier wave is under IFFT processing.