A design method of efficient adaptive predistorter for High Power Amplifier

In order to use adaptive algorithms more flexible and faster the convergence rate in the process of High Power Amplifier (HPA) adaptive pre-distortion, and overcome the amplitude over-compressing, an efficient adaptive predistorter for HPA is designed, in which the amplitude-amplitude (AM-AM) and amplitude-phase (AM-PM) adaptive pre-distorter are using tandem structure; amplitude pre-distortion device adopts the indirect adaptive structure to train; phase pre-distortion device is got by directly identifying the AM-PM characteristics of the amplifier and on the contrary, AM-PM characteristics identification is phase pre-distortion device at the same time; The design is simple, highly efficient, stable and saving resources, In which, adaptive algorithms are applied more flexible and convergence rate is faster. The amplitude pre-distorter basing on sinusoid, can give attention to efficiency, maximal export power and linearity. Finally, 16-QAM signal as an example is used to carry out simulation testing, simulation results show the advantages of the technology.