Zhe Li

Grid-Refinement SBL for AFDM Channel Estimation Under Fractional Delay and Fractional Doppler Channels

This paper investigates channel estimation for affine frequency division multiplexing (AFDM) systems over channels with fractional delay and fractional Doppler (FDFD) shifts. An exact FDFD channel model is first established, and the corresponding input--output relationship is also derived. To address the FDFD-induced d...