New look-up-table predistorter for power amplifier with memory effects

A new look-up-table memory predistorter for power amplifier with memory effects is proposed. The cascade extension of the memoryless predistorter and the structure of finite-impulse-response filter significantly reduce the complexity compared to memory polynomial methods, whereas they can get the close performance. Two improved methods, linear insertion and iteration with weights' windows, are also discussed to solve quantization distortions and convergence speed problems respectively, which are introduced intrinsically by look-up-table method. Under power amplifier's memory polynomial model, simulation results of multi-carriers WCDMA wideband signal and OFDM wideband signal show excellent performance of the look-up-table memory predistorter and the efficiency of the two improved methods.