Multiple-Mode Affine Frequency Division Multiplexing With Index Modulation

作者：Guangyao Liu, Tianqi Mao, Yanqun Tang, Jingjing Zhao, Zhenyu Xiao, Zhu Han · 发表于：IEEE Wireless Communications Letters · 年份：2025 · DOI：10.1109/lwc.2025.3621886 · 被引用次数：5 · 研究领域：Optical Network Technologies、PAPR reduction in OFDM、Advanced Fiber Optic Sensors

Affine frequency division multiplexing (AFDM) is a promising multicarrier technique utilizing chirp signals, and has been envisioned as an effective solution for high-mobility communication scenarios. In this paper, we develop a multiple-mode index modulation scheme tailored for AFDM, termed as MM-AFDM-IM, which aims to further improve the spectral and energy efficiencies of AFDM. Specifically, multiple constellation alphabets are selected for different chirp-based subcarriers (hereafter referred to as chirps). Aside from classical amplitude/phase modulation, additional information bits can be conveyed by the dynamic patterns of both constellation mode selection and chirp activation, without extra energy consumption. Furthermore, we discuss the mode selection strategy and derive an asymptotically tight upper bound on the bit error rate of the proposed scheme under maximum-likelihood detection. Simulation results are provided to demonstrate the superior performance of MM-AFDM-IM compared to conventional benchmark schemes.