Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2004-09-13
2010-12-07
Lugo, David B (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S298000
Reexamination Certificate
active
07848452
ABSTRACT:
A distortion compensating apparatus has an IQ imbalance compensation coefficient arithmetic circuit31for calculating, from correlation values of a transmission signal and a feedback signal, IQ imbalance compensation coefficients for compensating for IQ imbalance in a quadrature modulator23; and an IQ imbalance compensator21for compensating for the IQ imbalance with respect to a distortion compensated signal output from a distortion compensator11according to the IQ imbalance compensation coefficients, and for outputting to the quadrature demodulator23.
REFERENCES:
patent: 6104983 (2000-08-01), Nakada
patent: 6741663 (2004-05-01), Tapio et al.
patent: 6771708 (2004-08-01), Suga et al.
patent: 2002/0015450 (2002-02-01), Ratto
patent: 2006/0008030 (2006-01-01), Luke et al.
patent: 06-268703 (1994-09-01), None
patent: 2001-016283 (2001-01-01), None
patent: 3144649 (2001-01-01), None
patent: 2001-168774 (2001-06-01), None
patent: 2002-077285 (2002-03-01), None
patent: WO-03/081867 (2003-10-01), None
Koh Ri, Takeharu et al., “Automatic Self Correction Circuit using TDMA-TDD” STE Telecommunication Engineering Co., Ltd. and Casio Computer Co., Ltd., B-314 IEICE Spring Conference 1993. Publication Date: Mar. 15, 1993.
James K. Cavers, “The Effect of Quadrature Modulator and Demodulator Errors on Adaptive Digital Predistorters for Amplifier Linearization,” IEEE Transactions on Vehicular Technology, vol. 46, No. 2, pp. 456-466, May 1997.
Ando Nobuhiko
Hayashi Ryoji
Birch & Stewart Kolasch & Birch, LLP
Lugo David B
Mitsubishi Electric Corporation
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