Reduced Complexity Hybrid PAPR Reduction Schemes for Future Broadcasting Systems

Abstract

The Peak-to-Average Power Ratio (PAPR) plays a vital role in future multicarrier wireless communication systems. High Power Amplifiers (HPAs) adeptness eases because of high PAPR, making them to work in non-linear mode which leads in-band and out of band harmonic interferences. Many hybrid PAPR reduction schemes have been available in literature with low complexity. A novel hybrid method is introduced by merging the reduced complexity Partial Transmit Sequence (PTS) and various companding methods which reduces PAPR considerably. In PTS, the complexity is reduced by summing the power of the samples which are in time domain called cost function Qs at time s in distinct subblock. This reduced complex PTS is combined with various non-linear companding methods like modified error techniques root companding technique (RCT) and New Error Function (NERF), modified error technique: COS, absolute exponential (AEXP), modified tangent technique: tangent rooting (tanhR), logarithmic rooting (logR) for an optimum PAPR. The simulation results validate the significance of the techniques applied. These companding methods combined to PTS technique are more appropriate for an OFDM application in future broadcasting systems that doesn’t have processors of high level, accept suggestive drop in PAPR with gentle cost, computational difficulty with insignificant performance deprivation.