Non‐linear companding based hybrid PAPR reduction approach for DCT‐SCFDMA system

Abstract

This study presents a new hybrid scheme that effectively reduces the peak-to-average power ratio (PAPR) of discrete cosine transform based single-carrier frequency division multiple access (DCT-SCFDMA) signal as well as improves the bit error rate (BER) performance of system. The method is to consolidate pulse shaping process with a novel hyperbolic tangent companding technique so that the PAPR of the SCFDMA signals can be further reduced by enabling the transformation of the amplitude of modulated signals into uniform distribution. Through extensive computer simulations, it has been shown that proposed scheme achieves significant improvements in BER and PAPR reduction over the existing standard pulse shaping methods when used alone in DCT-SCFDMA system as far as the lowest PAPR is concerned without degrading the error performance of the system.