Fractional Fourier Domain PAPR Reduction

TL;DR

This paper presents DA-FrFDM, a novel multi-carrier system that reduces PAPR in signals by utilizing the fractional Fourier domain, improving efficiency and signal quality in challenging channel conditions.

Contribution

Introduction of DA-FrFDM, a new fractional Fourier domain-based method for PAPR reduction that outperforms existing techniques with minimal signaling overhead.

Findings

Significant PAPR reduction in QAM and Gaussian signals.

Effective inter-carrier interference mitigation in doubly dispersive channels.

Enables one-tap equalization via simple quadratic phase multiplication.

Abstract

High peak-to-average power ratio (PAPR) has long posed a challenge for multi-carrier systems, impacting amplifier efficiency and overall system performance. This paper introduces dynamic angle fractional Fourier division multiplexing (DA-FrFDM), an innovative multi-carrier system that effectively reduces PAPR for both QAM and Gaussian signals with minimal signaling overhead. DA-FrFDM leverages the fractional Fourier domain to balance PAPR characteristics between the time and frequency domains, achieving significant PAPR reduction while preserving signal quality. Furthermore, DA-FrFDM refines signal processing and enables one-tap equalization in the fractional Fourier domain through the simple multiplication of time-domain signals by a quadratic phase sequence. Our results show that DA-FrFDM not only outperforms existing PAPR reduction techniques but also retains efficient inter-carrier interference (ICI) mitigation capabilities in doubly dispersive channels.