Patent ID: 7480337

Claim:
A tracking system comprised in an Orthogonal Frequency Division Multiplexing (OFDM) receiver, which tracking system is operable to track rapid changes in frequency and phase offset, wherein said tracking system comprises: a frequency correction means operable to correct a frequency error of a received OFDM symbol, a transforming means connected to said frequency correcting means operable to perform a Fourier transform operation resulting in a number of independently modulated subcarriers, a first estimating means connected to said transforming means operable to perform an initial coarse estimate of the phase of the received OFDM symbol, based on the phase of pilot subcarriers, a first phase correction means connected to said first estimating means operable to perform an initial correction of a symbol phase, a second estimating means connected to said first phase correction means operable to perform a data-driven phase estimation on the corrected symbol resulting in a refined phase estimate, and a second phase correction means connected to said second estimating means and to said transforming means, said second phase correction means being operable to perform a more precise correction of the received OFDM symbol phase.