Maximum likelihood frequency detectors for orthogonal multicarrier systems

A frequency estimation algorithm for a multicarrier system based on the maximum likelihood principle is derived. A frequency detector structure directly based on this algorithm is proposed, together with a reduced complexity structure having the same performance. Such a detector shows a very small acquisition range due to the particular form of the likelihood functions for a multicarrier sytem. To overcome this limitation, a modified version of the frequency detector is proposed. It has a considerably increased acquisition range together with low augmentation in complexity