Simple peak-to-average power ratio reduction by non-regular signal constellation sets

Peak-to-average power ratio (PAPR) is a major problem for high rate communication systems, which employ e.g. quadrature amplitude modulation (QAM) with a large signal constellation set (SCS). We propose a novel and extremely simple scheme for PAPR reduction, which removes the critical channel symbols from the SCS and instead map the respective bit patterns to other existing channels symbols. This results in non-unique bit mappings for non-regular SCSs. We demonstrate the PAPR reduction by examples which achieve reductions of close to 45% with almost no impact on the performance, which is proven by simulations. The performance is further analyzed and explained using a mutual information analysis.