Digital pre-distortion processing system with sample rate conversion and method thereof

The invention discloses a digital pre-distortion processing system with sample rate conversion and a method thereof. The system comprises: a power-amplifier anti-model solution module and a digital pre-distortion module. The power-amplifier anti-model solution module and the digital pre-distortion module both comprise a sample rate conversion apparatus. The sample rate conversion apparatus is used to convert a sequence with 1 times sample rate into the sequence with the multiple times sample rate and extract the sequence with the 1 times sample rate from the sequence with the multiple times sample rate. According to the invention, a spectrum aliasing phenomenon can be eliminated through a sample rate conversion method. A pre-distortion effect of transmitting a broadband or multiband signal through a non-linear channel can be effectively improved.