Title:
DC OFFSET COMPENSATION METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2006/072973
Kind Code:
A1
Abstract:
There is provided a method for accurately compensating a DC offset component contained in a signal to be modulated, i.e. a transmission signal generated in a quadrature modulation system. A DC offset correction value determined from the transmission signal is subjected to weighting in accordance with the signal level of an input signal to the quadrature modulation system as transmission data, and then the DC offset component contained in the transmission signal is compensated based on the weighted DC offset correction value.
Inventors:
ISHIKAWA HIROYOSHI (JP)
FUDABA NOBUKAZU (JP)
NAGATANI KAZUO (JP)
HAMADA HAJIME (JP)
KUBO TOKURO (JP)
FUDABA NOBUKAZU (JP)
NAGATANI KAZUO (JP)
HAMADA HAJIME (JP)
KUBO TOKURO (JP)
Application Number:
PCT/JP2005/000002
Publication Date:
July 13, 2006
Filing Date:
January 04, 2005
Export Citation:
Assignee:
FUJITSU LTD (JP)
ISHIKAWA HIROYOSHI (JP)
FUDABA NOBUKAZU (JP)
NAGATANI KAZUO (JP)
HAMADA HAJIME (JP)
KUBO TOKURO (JP)
ISHIKAWA HIROYOSHI (JP)
FUDABA NOBUKAZU (JP)
NAGATANI KAZUO (JP)
HAMADA HAJIME (JP)
KUBO TOKURO (JP)
International Classes:
H04B1/04; H03M1/10; H04L27/20; H04L27/36
Foreign References:
| JP2002077285A | 2002-03-15 | |||
| JPH0983587A | 1997-03-28 | |||
| JPH10136048A | 1998-05-22 | |||
| JP2001267850A | 2001-09-28 | |||
| JP2002077285A | 2002-03-15 | |||
| US20040082305A1 | 2004-04-29 | |||
| US6141390A | 2000-10-31 |
Other References:
See also references of EP 1835626A4
LARS SUNDSTRON ET AL.: "Quantization Analysis and Design of a Digital Predistortion Linearizer for RF Power Amplifiers", IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 45, no. 4, 1 November 1996 (1996-11-01)
LARS SUNDSTRON ET AL.: "Quantization Analysis and Design of a Digital Predistortion Linearizer for RF Power Amplifiers", IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 45, no. 4, 1 November 1996 (1996-11-01)
Attorney, Agent or Firm:
Aoki, Atsushi (ISHIDA & ASSOCIATES Toranomon 37 Mori
Bldg., 5-1, Toranomon 3-chome, Minato-k, Tokyo 23, JP)
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