Frequency correction for a multicarrier system

Details Frequency correction for a multicarrier system Frequency correction for a multicarrier system

2008-01-29

2008-01-29

Payne, David C. (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

Reexamination Certificate

active

07324599

ABSTRACT:
In order to correct frequency deviations of signals in a multicarrier system, such as a OFDM-system, the present invention provides a frequency tracker and a method to operate the same. The frequency tracker is based on a decision directed digital phase locked loop exhibiting a predictive character. On the basis of an estimated phase offset for a received signal (signal component, signal symbol) a predicted phase offset is calculated and applied to the signal (signal component, signal symbol). Further, received signals (signal components, signal symbols) are sampled and for each sample a sample phase offset to be corrected is calculated in dependence to the related estimated phase offset to incorporate the predictive character. In particular, the predicted sample phase offsets are calculated as a function of a corresponding predicted phase offset and a measure being indicative of a distance, in the time domain, between a corresponding phase reference point for the predicted phase offset and a phase reference point defined for a specific part of the received signal, preferably for a preceding preamble signal.

REFERENCES:
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John G. Proakis, “Digital Communications”, 4th edition, published on Aug. 2000 (pp. 341-350).
Luise et al; “Carrier Frequency Acquisition and Tracking for OFDM Systems”; IEEE Transaction on Communications, IEEE Inc., New York, US, vol. 44, No. 11, Nov. 1, 1996, pp. 1590-1598, XP002081217.
Lee et al; “A New Symbol Timing Recovery Algorithm for OFDM Systems”; IEEE Transactions on Consumer Electronics, IEEE Inc., New York, US, vol. 43, No. 3, Aug. 1, 1997, pp. 767-774, XP000742560.
EP Communication mailed Apr. 2, 2007 in corresponding EP application No. 070032362.2.
Luise et al, “Carrier Frequency acquisition and Tracking for OFDM Systems”, IEEE Transactions on Communications, IEEE Inc., New York, US, vol. 44, No. 11, Nov. 1, 1996, pp. 1590-1598.
Lee et al, “A New Symbol Timing Recovery Algorithm for OFDM Systems”, IEEE Transactions on Consumer Electronics, IEEE Inc., New York, US, vol. 43, No. 3, Aug. 1, 1997, pp. 767-774.

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