Distortion compensating apparatus

Details Distortion compensating apparatus Distortion compensating apparatus

2005-06-10

2009-06-23

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S295000, C375S285000, C375S297000, C455S450000, C455S126000, C330S149000, C330S151000

Reexamination Certificate

active

07551687

ABSTRACT:
A distortion compensating apparatus for correcting the size of a distortion compensation coefficient in such a manner that a transmit signal that has undergone distortion compensation will not exceed the dynamic range of a DA converter. Specifically, before a distortion compensation coefficient hn+1(p) that has been calculated by a calculation unit is stored in a coefficient memory, an assumption is made that distortion compensation will be performed using the distortion compensation coefficient hn+1(p). Then it is determined beforehand whether a signal x(t)*hn+1(p) that will be obtained by this distortion compensation will exceed the limit of a DA converter. If the limit will be exceeded, the size of the distortion compensation coefficient is reduced by a correction unit, the corrected distortion compensation coefficient is stored in the memory and the transmit signal is corrected using the stored distortion compensation coefficient.

REFERENCES:
patent: 5699383 (1997-12-01), Ichiyoshi
patent: 6167273 (2000-12-01), Mandyam
patent: 6201490 (2001-03-01), Kawano et al.
patent: 6212378 (2001-04-01), Wismer
patent: 6230031 (2001-05-01), Barber
patent: 6400774 (2002-06-01), Matsuoka et al.
patent: 8242263 (1996-09-01), None
patent: 9064780 (1997-03-01), None
patent: 10322137 (1998-12-01), None
Notification of Reason(s) for Refusal dated Dec. 11, 2007, for corresponding Japanese Patent Application JP 2000-097092.

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