| 摘要 |
A tracking system comprises a frequency correction means operable to correct a frequency error of a received OFDM symbol. The tracking system also comprises a to the frequency correcting means connected transforming means, operable to perform a Fourier transform operation resulting in a number of independently modulated subcarriers, an to the transforming means connected first estimating means operable to perform an initial coarse estimate of the phase of the received OFDM symbol, based on the phase of one or more subcarriers carrying pilot tones, a to the first estimating means connected first phase correction means operable to perform an initial correction of the symbol phase, a to the first phase correction means connected second estimating means operable to perform a data-driven phase estimation on the corrected symbol resulting in a refined phase estimate, and a to the second estimating means connected phase and frequency tracking means.
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