Joint study of PAPR reduction and digital predistortion
Résumé
Within the issue of transmission of signals with no constant envelope as Orthogonal Frequency Division Multiplexing (OFDM) for example, the Peak-to-Average Power Ratio (PAPR) reduction and the linearization are nowadays the two solutions proposed to deal the effects of the nonlinearities of the power amplifiers. In spite of their interdependence, these two solutions are separately studied and optimized.This can degrade seriously their common performance once stakes together because of opposite effects. In this paper, based on Rapp's memoryless amplifier, we demonstrate that predistortion increase the signal's PAPR and then proposed a joint combination scheme of "clipping & filtering" and polynomial predistortion. Computer simulations and analysis show that signal keeps a good level of linearity improvement measured with Modulation Error Ration (MER) while decreasing the predistortion's complexity.