Abstract:

In order to reduce the adjacent spectrum leakage caused by the coherently non-linearity of radio frequency (RF) power amplifier（PA） in the communication system, a new multi-intervals polynomial model is proposed for solving non-linearity of the widespread doherty PA. According to system test, the proposed model reduces the adjacent channel leakage ratio (ACLR) up to 16 dB more than the polynomial model. Comparing to the digital predistortion solution of foreign company, the new model can further provide ACLR more than a 10 dB. Additionally, this model is more suitable for field programmable gate array (FPGA) implementation.

Key words:  digital predistortion, field programmable gate array, memory polynomial model, power amplifier, multi-intervals polynomial model