| Power amplifiers are essential components in communication systems and are inherently nonlinear. The nonlinearity creates spectral growth beyond the signal bandwidth, which interferes with adjacent channels. It also causes distortions within the signal bandwidth, which increases the bit error rate at the receiver.Based on the complete and deep study of the nonlinearity of radio power amplifier,this dissertation focuses on predistortion technique,one of the most cost efective ways among all the linearization techniques,and tests the performance of a memoryless baseband LUT predistorter on hardware platform.For wideband or high power applications, the power amplifier exhibits memory effects, for which memoryless predistorters can achieve only limited linearization performance.In this dissertation,we investigate a method that use a adaptive equalizer to defend the memorry effect in system,and propose its simplified architecture,which can achieve good result in simulation. |
