Frequency Error Correction by Using Remodulation

An apparatus for analyzing a digital signal representing a communications signal, comprising a series of information symbols, that has been acquired by a receiver through a propagation channel, the apparatus comprising

• symbol estimation means for processing samples of the digital signal to estimate symbols of the communications signal;
• sample simulation means for modeling at least one sample of the digital signal using the estimated symbols and knowledge about the propagation channel;
• and
• phase error estimation means for comparing a modeled sample of the digital signal with an actual sample of the digital signal to estimate a phase error in the latter sample,
• wherein each phase error produced by the phase error estimation means is made available for correction of the digital signal sample, if any, that follows the digital signal sample on which the phase error was estimated.