Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2011-08-02
2011-08-02
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S297000, C332S107000
Reexamination Certificate
active
07991073
ABSTRACT:
A distortion compensation apparatus includes a distortion compensation unit that performs distortion compensation processing on a transmission signal by a series operation, a coefficient update unit that updates a group of series operation coefficients used for the series operation based on a feedback signal of transmission signal output that is output after power amplification processing is performed on output of the distortion compensation unit and the transmission signal, an initial coefficient memory that stores the groups of series operation coefficients that become initial values for coefficient update processing by the coefficient update unit, and a power fluctuation detection unit that detects a power fluctuation of the transmission signal and, when the power fluctuation is detected, reads the groups of series operation coefficients from the initial coefficient memory and provides the groups of series operation coefficients to the coefficient update unit.
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Fudaba Nobukazu
Hamada Hajime
Ishikawa Hiroyoshi
Nagatani Kazuo
Utsunomiya Yuichi
Bocure Tesfaldet
Fujitsu Limited
Staas & Halsey , LLP
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