PAPR Reduction for OFDM Systems by Deliberate Power Boost

In this paper, we propose deliberate power boost (DPB) to reduce the PAPR (peak-to-average power ratio) in an OFDM (orthogonal frequency-division multiplexing) system. Although both the average power and peak power are increased by using DPB, we show that the PAPR can be reduced by the proposed method. DPB can be combined with other PAPR-reduction techniques such as deliberate clipping and repeated clipping and filtering (RCF) for further PAPR reduction. Although selective mapping (SLM) is originally proposed for PAPR reduction, we apply a concept similar to SLM to clipping-based OFDM systems for improved error performance. We show that turbo coded OFDM systems using both RCF and DPB can achieve better PAPR performance without degrading the error performance as compared to the case of using only RCF if SLM is used for improved error performance in both systems.