Adaptive active constellation extension for PAPR reduction in OFDM systems

Multicarrier modulations like OFDM suffer from large Peak-to-Average-Power Ratio (PAPR) which causes challenges to the RF front-end. Large PAPR lead to inefficient use of High Power Amplifiers (HPAs) or decreases the system performance. A large number of PAPR reduction methods have been proposed in literature like coding, clipping, tone reservation, tone injection, symbol phase manipulation and constellation adjustment. Active constellation extension (ACE) is a simple method that extends the outer constellation points away such that the minimum distance between the constellation points is not reduced. In this paper adaptive ACE for higher order constellation is simulated. The results are conduced by the power spectral density plots, CCDF and BER plots.