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.

翻译：高峰均功率比(PAPR)长期以来一直是多载波系统面临的挑战，影响放大器效率与整体系统性能。本文提出动态角度分数阶傅里叶分复用(DA-FrFDM)——一种创新的多载波系统，能以最小信令开销有效降低QAM信号和高斯信号的PAPR。DA-FrFDM利用分数阶傅里叶域平衡时域与频域的PAPR特性，在保持信号质量的同时实现显著的PAPR降低。此外，DA-FrFDM通过将时域信号与二次相位序列简单相乘，优化了信号处理流程，并能在分数阶傅里叶域实现单抽头均衡。实验结果表明，DA-FrFDM不仅优于现有PAPR抑制技术，在双弥散信道中仍能保持高效抑制载波间干扰(ICI)的能力。