PAPR reduction in an OFDM system using a hybrid DST–RMC approach for 5G and B5G applications

Abstract

Achieving high‐peak‐to‐average power ratio (PAPR) remains a fundamental challenge in orthogonal frequency‐division multiplexing (OFDM) systems. In this study, a hybrid PAPR reduction scheme is proposed that combines a discrete sine transform (DST) precoder with root‐based ‐law companding (RMC). First, the DST precoder transforms the OFDM signal into a single carrier, thereby reducing the PAPR. In the second stage, the RMC technique was employed on the DST‐precoded OFDM signal to suppress PAPR further. The proposed DST–RMC scheme demonstrated superior performance in PAPR reduction. In addition, it achieved better bit error rate performance than several existing techniques over a Rayleigh fading channel. The simulation results show that the proposed method achieves a PAPR reduction of up to 2 dB at a complementary cumulative distribution function level of (10 ⁻³ ). Furthermore, the low PAPR framework of the proposed scheme makes it well‐suited for 5G and beyond‐5G wireless systems, where power efficiency and signal quality are of critical importance.