Multilevel QAM symbol timing detector and multilevel QAM...

Details Multilevel QAM symbol timing detector and multilevel QAM... Multilevel QAM symbol timing detector and multilevel QAM...

2011-04-26

2011-04-26

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S326000, C375S293000

Reexamination Certificate

active

07933362

ABSTRACT:
A multilevel symbol timing signal detector is provided, which is used for reliably detecting the symbol timing of a multilevel QAM signal. When an oversampling I signal is inputted to I-Signal Histogram Generator610, the signal is subjected to 1-symbol length buffering by computing absolute values. Sampling times corresponding to an oversampling frequency and amplitude data for these times are extracted from the buffered data and the amplitude data is buffered for each sampling time over predetermined intervals. Histograms of the amplitude data for each sampling time are generated based on these buffered amplitude data. Symbol timing is acquired by detecting a sampling time corresponding to the amplitude data with the highest frequency of detection based on the histograms of amplitude data.

REFERENCES:
patent: 5598439 (1997-01-01), Wagner
patent: 6477215 (2002-11-01), Temerinac
patent: 6731697 (2004-05-01), Boccuzzi et al.
patent: 2002/0051487 (2002-05-01), Yamada et al.
patent: 2003/0095617 (2003-05-01), Lee et al.
patent: 2003/0161393 (2003-08-01), Ahn
patent: 2005/0018792 (2005-01-01), Singh
patent: 2005/0286619 (2005-12-01), Haddadin et al.
patent: 07-321867 (1995-12-01), None
patent: 11-112589 (1999-04-01), None
patent: 11-284676 (1999-10-01), None
patent: 2001-24562 (2001-01-01), None
patent: 2001-24563 (2001-01-01), None
patent: 2002-84267 (2002-03-01), None
patent: 2003-309613 (2003-10-01), None
patent: 2004-201077 (2004-07-01), None
Dimitrios Efstathiou and A. Hammid Aghvami,“Preamble-Less Nondecision-Aided (NDA) Feedforward Synchronization Techniques for 16-QAM TDMA Demodulators”, May 1998, IEEE.
J. H. Grimm, R. N. Kumar, J. Kusuma, and J. V. Krogmeier, “Real Time Implementation of a Symbol Timing Recovery Algorithm for a Narrowband Wireless Modem” School of Electrical and Computer Engineering, Purdue University, 1998 IEEE.
International Search Report dated Feb. 7, 2006.

Affiliated with

Also associated with

Rating

Multilevel QAM symbol timing detector and multilevel QAM... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multilevel QAM symbol timing detector and multilevel QAM..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multilevel QAM symbol timing detector and multilevel QAM... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2628593