Synchronous detector with high accuracy in detecting synchronization and a method therefor
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United States of America Patent
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Oct 14, 2008
Grant Date -
Oct 13, 2005
app pub date -
Mar 31, 2005
filing date -
Apr 13, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a symbol timing detector, a correlator calculates a correlation value for a received radio packet signal. A peak detector compares the correlation value with a threshold value to be used, and sends, upon a correlation value detected larger than the threshold value, a detection signal to a symbol synchronous processor. A threshold value to be used for the peak detector is set different, after the first peak detected, between a predetermined estimation period and a period other than the former. A first peak is detected with a threshold value under a severer condition in the period other than the estimation period, and the next peak detection timing is estimated upon the first peak detected. A synchronization detecting position is determined, when no correlation peak is detected at the estimated timing, to output a sync detection signal.
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