Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-06-30
2008-11-04
Bocure, Tesfaldet (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
Reexamination Certificate
active
07447274
ABSTRACT:
Provided is a distortion compensation apparatus to prevent divergence of distortion compensation coefficients caused by an abnormal distortion compensation coefficient value. The distortion compensation apparatus includes a storage for storing a distortion compensation coefficient in a specified write address, and outputting a distortion compensation coefficient stored in a specified readout address; a predistortion portion for performing distortion compensation processing onto a transmission signal, using the distortion compensation coefficient being output from the storage; and a distortion compensator for calculating a distortion compensation coefficient based on the transmission signal before the distortion compensation processing and the transmission signal after being amplified by an amplifier. The distortion compensator further reads out the distortion compensation coefficients stored in the storage, extracts a distortion compensation coefficient satisfying a predetermined condition, and performs correction processing to reduce the amplitude of the extracted distortion compensation coefficient.
REFERENCES:
patent: 5404378 (1995-04-01), Kimura
patent: 6836517 (2004-12-01), Nagatani et al.
patent: 2003/0112891 (2003-06-01), Ozaki
patent: 2008/0003958 (2008-01-01), Ohba et al.
patent: 2001-89685 (2001-07-01), None
patent: WO 03/103163 (2003-12-01), None
Funyu Yasuhito
Ohba Takeshi
Shako Hideharu
Bocure Tesfaldet
Fujitsu Limited
Hanify & King P.C.
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