Look-up Table type Digital Pre-distorter for Linearization Power Amplifier with Non-linearity and Memory Effect

전력증폭기의 비선형 특성과 Memory Effect를 보상하기 위한 Look-up Table 방식의 Digital Pre-distorter

RF power amplifier requires linearization in order to reduce adjacent channel interference. And most of the existing linearization algorithms assume that a PA has memory-less nonlinearity. But for the wider bandwidth signal, the memory effect of PA cannot be ignored. This paper investigates digital pre-distortion by use of a memory polynomial model which compensates for amplifier nonlinearity and memory effect. The look-up table based implementation scheme is used to reduce the computational complexity of the pre-distortion block. The linearization performance is demonstrated on wideband CDMA signal and class AB high power amplifier.