Study Connects Doppler-Domain Sparsity to OTFS Performance Edge

This article examines the theoretical and practical relationship between OFDM and OTFS, showing that OTFS offers higher spectral efficiency, stronger diversity gain, and reduced channel estimation overhead in doubly-dispersive, high-mobility environments. It derives the discrete channel model, identifies overlooked error sources, and presents algorithms and simulations that highlight OTFS’ necessity in future wireless systems.