A new method of linearity based on predistortion for memory nonlinear system is introduced in this paper.Different from the traditional predistortion models (direct study model and indirect study model)

the transfer function instead of the inverse transfer function is obtained for memory nonlinear system.The transfer function is presented as piecewise linear function first

and then be used in predistortion process.The results show that the NMSE(Normalized Mean Square Error) of the memory nonlinear system output is reduced about 80dB

and the ACLR(Adjacent Channel Leakage Ratio) is reduced over 70dB

comparing with no predistortion system.The memory and nonlinear characteristics are eliminated

and the relationship of input and output becomes linear and memoryless.