Symbol timing tracking and method therefor

Details Symbol timing tracking and method therefor Symbol timing tracking and method therefor

2006-02-21

2006-02-21

Vo, Don N. (Department: 2631)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S354000

Reexamination Certificate

active

07003056

ABSTRACT:
A system and method in a communication device (10) uses timing tracking to correct timing drifting due to the difference in frequency of a transmitter clock and a receiver clock. With the timing tracking, correlation values of three consecutive samples are calculated using the receive signal and the recovered symbols and then summed. A timing signal, (nk, frack) is updated based upon a metric calculated from a previous correlation value, R−1, present correlation value (R0) and a next con-elation value (R+1). Adjustment of timing signal is based on the relative location with respect to the current timing of a peak of a second order polynomial curve formed by the first correlation value R−1, the second correlation value R0and the third correlation value R+1.

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patent: 2003/0031121 (2003-02-01), Sudo
patent: WO 01/80508 (2001-10-01), None
Patenaude et al.;A New Symbol Timing Tracking Algorithm For π /2-BPSK and π/4-QPSK Modulations; ICC Proceedings; pp. 1588-1592; 1992.
Cheol-Hee Park et al.;Channel Estimation And DC-Offset Compensation Schemes For Frequency-Hopped Bluetooth Networks; IEEE Communications Letters, vol. 5, No. 1, Jan. 2001; 3 pages.
Cheol-Hee Park et al.;Techniques For Channel Estimation, DC-Offset Compensation, And Link Quality Control In Bluetooth System; IEEE Transactions on Consumer Electronics, vol. 46, No. 3, Aug. 2000; pp. 682-689.

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