Unified AFDM waveform design framework enables ambiguity function shaping via weighted ISL minimization, PAPR control, or joint operation using reserved chirp subcarriers and a JIPD-MM solver.
Multi-functional chirp signalling for next-generation multi-carrier wireless networks: Communications, sensing and ISAC perspectives
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Proposes AFDM-ISAC waveform with chirp subcarrier frame structure, analog chirp-compression receiver, and GCE-BEM-based channel estimation for integrated sensing and communications.
DAFT-s-AFDM with probabilistic constellation shaping achieves a superior controllable tradeoff between communication and sensing ambiguity function performance in ISAC systems.
Introduces low-complexity MMSE and MRC-TD detectors for ZP-AFDM exploiting lower-triangular channel structure, with theoretical BER analysis and simulations showing equivalent performance to full MMSE at reduced cost.
An adaptive optimization of the c2 parameter in AFDM reduces PAPR and weighted sidelobe levels using a spectral projected-gradient algorithm for improved ISAC performance.
AFDM is analyzed for standardization potential, showing backwards compatibility with 4G/5G, radar, and LoRa systems while highlighting robustness in delay-Doppler channels for NTN, ISAC, V2X, and UWA applications.