2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/173141This paper proposes a novel maximum Doppler spread estimation algorithm for OFDM systems with the comb-type pilot pattern. By tracking the drifting delay subspace of the multipath channel, the time correlation function is measured at a high accuracy, which accordingly improves the estimation accuracy of the maximum Doppler spread considerably.5 pages, 3 figures, To appear in IEEE GLOBECOM'08Information Theorytext