Analysis of spectral regrowth of weakly nonlinear power amplifiers

Power amplifiers (PAs) are important components in a wireless communications system. Linearity and efficiency are two desirable but conflicting requirements, All PAs exhibit varying degrees of nonlinearity which causes spectral regrowth and adjacent channel interference. Based on the behavior model of the PA and statistics of the input, it is possible to analyze spectral regrowth in the output. Existing results assume that the input is Gaussian whereas our analysis does not. Analytical results on spectral regrowth are useful in finding optimal operating conditions of the PA so that maximum efficiency is achieved without violating the out-of-band emission requirement.