Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2003-12-19
2009-08-25
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S136000, C375S145000, C375S149000, C375S350000, C375S362000
Reexamination Certificate
active
07580466
ABSTRACT:
The present invention relates to a demodulation device and a demodulation method, and its object is to demodulate subcarrier components utilizing estimated delay profiles to control the timing for performing a Fourier transform and the pass band of an interpolation filter used in interpolating transmission channel characteristics along a frequency axis so as to suppress unnecessary noise components, whereby an error rate after the demodulation is reduced. To achieve the object, in a demodulation device according to the present invention, a Fourier transform unit1performs a Fourier transform according to a timing signal and an interpolation filter unit18sets a pass band of a frequency interpolation filter used for interpolation along the frequency axis based on a signal corresponding to a maximum delay time, whereby the frequency band of a transmission channel characteristic corresponding to a subcarrier component is restricted when it is output.
REFERENCES:
patent: 5946292 (1999-08-01), Tsujishita et al.
patent: 7020074 (2006-03-01), Rickard et al.
patent: 7215636 (2007-05-01), Seo et al.
patent: 2003/0063678 (2003-04-01), Crawford
patent: 2006/0239178 (2006-10-01), Svensson et al.
patent: 2006/0291578 (2006-12-01), Singh et al.
patent: 10-075226 (1998-03-01), None
patent: 2000-332727 (2000-11-01), None
patent: 2001-292125 (2001-10-01), None
patent: 2001-308760 (2001-11-01), None
patent: 2002-064413 (2002-02-01), None
patent: 2002-261729 (2002-09-01), None
patent: 2002-300131 (2002-10-01), None
Birch & Stewart Kolasch & Birch, LLP
Liu Shuwang
Mitsubishi Denki & Kabushiki Kaisha
Timory Kabir A
LandOfFree
Demodulation device and demodulation method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Demodulation device and demodulation method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Demodulation device and demodulation method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4121909