Synchronous detector with high accuracy in detecting...

Details Synchronous detector with high accuracy in detecting... Synchronous detector with high accuracy in detecting...

2005-03-31

2008-10-14

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

C375S219000, C375S295000, C327S141000, C358S409000, C455S073000, C370S503000, C713S400000, C714S012000

Reexamination Certificate

active

07436906

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.

REFERENCES:
patent: 6646980 (2003-11-01), Yamamoto et al.
patent: 6658063 (2003-12-01), Mizoguchi et al.
patent: 7039000 (2006-05-01), You et al.
patent: 2004/0052319 (2004-03-01), Wakamatsu
patent: 2004/0247044 (2004-12-01), Matsushita et al.
Hideaki Matsue et al., “802.11 High-speed Wireless LAN Textbook”, IDG (International Data Group) Japan, pp. 189-191, 2003.

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