Constellation Compaction Design to Reduce Both PAPR and Average Power in OFDM Systems

This paper proposes a novel way to compact the constellation points in QAM modulation schemes and exploits this compaction to reduce the Peak to Average Power Ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems. The compaction is accomplished using one dimensional Product Code (PC). Significant PAPR reduction is achieved by carefully mapping the points in the compact version of the constellation to their radial symmetric points and choosing for transmission signalling points which result in lower PAPRs.