Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2011-04-05
2011-04-05
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S297000
Reexamination Certificate
active
07920644
ABSTRACT:
A predistortion apparatus for compensating for a distortion arising from a non linear property in input to output characteristics of an amplifier, by processing calculation of a plurality of coefficients for a plurality of power series defining the predistortion characteristics for a plurality of power ranges, respectively, the predistortion apparatus includes: a coefficient update unit for setting and updating coefficients of the power series to provide the predistortion characteristics for the plurality of power ranges in accordance with a comparison between the input and output of the amplifier; and a determination unit for determining at least one threshold value defining the plurality of power ranges by shifting the threshold value and operating the coefficient update unit for updating the coefficients for each of the power series corresponding to each of the power ranges defined by the shifted threshold value.
REFERENCES:
patent: 7466762 (2008-12-01), Shako et al.
patent: 7545880 (2009-06-01), Coons et al.
patent: 2005/0168283 (2005-08-01), Suzuki et al.
patent: 2005/0180527 (2005-08-01), Suzuki et al.
patent: 2006/0232332 (2006-10-01), Braithwaite
patent: 2008/0298501 (2008-12-01), Rabjohn et al.
patent: 1 560 329 (2005-08-01), None
patent: 2001-268150 (2001-09-01), None
patent: 2002-335129 (2002-11-01), None
patent: 2006-279780 (2006-10-01), None
patent: 2007-193689 (2007-08-01), None
V. John Mathews ,“Adaptive Polynomial Filters”, IEEE Signal Processing Magazine, pp. 10-26, Jul. 1991.
Extended European Search Report for corresponding European Application 09180246.2-2215; dated Apr. 7, 2010.
S. Haykin, “Adaptive filter theory” Kagaku Gijutsu Syuppan pp. 237-238, pp. 442-444, 2001.
Fudaba Nobukazu
Hamada Hajime
Ishikawa Hiroyoshi
Ishikawa Shohei
Nagatani Kazuo
Bocure Tesfaldet
Fujitsu Limited
Staas & Halsey , LLP
LandOfFree
Predistortion apparatus and predistortion 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 Predistortion apparatus and predistortion method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Predistortion apparatus and predistortion method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2643142