On the outphasing power amplifier nonlinearity analysis and correction using digital predistortion technique

This paper proposes a comprehensive theoretical and experimental analysis of the source of nonlinearity exhibited by outphasing based power amplifiers The important load-pulling effect engendered by the outphasing decomposition and the Chireix combiner is first investigated. Its effect on the two power amplifiers behavior is then identified as the dominant source of nonlinearity in the LINC system. In addition, this paper suggests the application of baseband predistortion technique to mitigate this nonlinear behavior.