Iterative adaptive signal predistortion for satellite communications

The expected increase of data rates in future satellite communications (DVB-S2X) will require higher-order modulations and sharper roll-off, which makes the transmission more sensitive to non-linear interference due to on-board amplifiers. One solution is the predistortion of the signal that is carried out at the transmitter. Iterative predistortion based on the contraction mapping theorem has shown to be a good solution to mitigate the effects of nonlinearities but suffers from convergence depending on the chosen norm. In this paper, we propose to adapt the method with a feedback from the channel to ensure the convergence with the best linearization performance for a given number of iterations. We compare both schemes according to different figures of merit (adjacent channel interference factor, total degradation and normalized mean square error).