FPGA Implementation of Adaptive Mode PAPR Reduction for Cognitive Radio Applications

PAPR reduction algorithms exist in the literature, are often effective for specific scenarios. The proposed adaptive mode PAPR reduction algorithm chooses the mode best suited for different transmission conditions in order to achieve a substantial reduction in PAPR for most scenarios which is essential in Cognitive radio. It was proposed in our previous paper that linear combination can be combined with sub carrier phase adjustment for achieving greater reduction in PAPR. The adaptive mode PAPR algorithm proposed in this work can choose either sub carrier phase adjustment or linear combination method or a combination of both according to the PAPR value of an incoming OFDM symbols. The proposed method can have a better than 5 dB reductions in the Peak to Average Power Ratio (PAPR) of an OFDM signal which is suitable for cognitive radio applications.