Cancelamento de Distorções Não Lineares em Sistemas OFDM Cooperativos AF

In this paper, we propose an iterative technique for canceling nonlinear distortions in cooperative OFDM systems AF. The proposed technique estimates and cancels the nonlinear distortions caused by the use of PAs at source and relay. With this technique the receiver will estimate the nonlinear distortions of the source and these estimates will aid in the detection and cancellation of the nonlinear distortions of the relay. The proposed system was evaluated through numerical simulations. The obtained results showed that the proposed technique has a great hability to cancel the nonlinear distortions, providing results very close to the case with linear PAs.