Abstract: A method includes obtaining complex pilot data in a frame from a sequence signal, determining an estimate of a Doppler shift from a cyclic prefix and a cyclic postfix of the frame, performing time-domain processing of an amplitude and phase of the complex pilot data separately for each subcarrier, determining a time average of the amplitude of the complex pilot data, correcting the phase of the complex pilot data by the estimate of the Doppler shift thereby generating the corrected phase, and filtering the corrected phase by a first filter. The method further includes calculating a metric for selecting a modulation type in subcarriers at a receiver with pre-selected or dynamically adjusted boundaries.