Synchronization apparatus and method for improving timing...

Details Synchronization apparatus and method for improving timing... Synchronization apparatus and method for improving timing...

2006-10-24

2010-06-29

Deppe, Betsy L (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S343000, C375S354000

Reexamination Certificate

active

07746941

ABSTRACT:
Provided are a synchronization apparatus and method for improving timing estimation performance in an OFDM-FDMA/CDMA/TDMA system, which can correctly estimate symbol timing through a more correct timing metric using a guard interval of a preamble. The synchronization apparatus includes an auto-correlator for calculating an auto-correlation value of a received signal and a signal delayed by a predetermined time, a power detector for calculating power of the received signal, a timing metric
ormalizer for normalizing the auto-correlation value by dividing the auto-correlation value by the calculated power to obtain a timing metric, and a peak detector for finding a peak value of the timing metric to estimate a frame starting position and an initial symbol timing. The auto-correlator calculates an auto-correlation length as long as a length of a guard interval, considering the preamble characteristic that the patterns are repeated in the time domain. The initial symbol timing is set to a position determined by adding the position where the timing metric has a peak value to the length of the guard interval and subtracting the maximum value of the expected channel delay spread from the result value.

REFERENCES:
patent: 6785350 (2004-08-01), Poulbere et al.
patent: 7058151 (2006-06-01), Kim
patent: 2004/0141570 (2004-07-01), Yamazaki et al.
patent: 2006/0114812 (2006-06-01), Kim et al.
patent: 2006/0222095 (2006-10-01), Niu et al.

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