MODULATOR WITH NONLINEAR EQUALIZER

Title:

MODULATOR WITH NONLINEAR EQUALIZER

Document Type and Number:

WIPO Patent Application WO/2005/029800

Kind Code:

A1

Abstract:

To equalize the output distortion of an output-stage high-frequency amplifier (232) of a communication device, a modulator comprises a digital filter (11) for sampling binary input data at a rate that is N times the symbol rate (N is an integer of two or more) to convert the binary input data into multinary data other than binary data and outputs the multinary data and a nonlinear equalizer (12) for overcompensating the output of the digital filter with a previously-measured nonlinear distortion of the output of the high-frequency amplifier.

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Inventors:

KOBAYASHI KENZO (JP)
AIZAWA SHIGEMI (JP)
TAMURA TOSHIO (JP)
OIDE KENICHI (JP)
IWAMATSU TAKANORI (JP)

Application Number:

PCT/JP2003/012035

Publication Date:

March 31, 2005

Filing Date:

September 19, 2003

Export Citation:

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Assignee:

FUJITSU LTD (JP)
KOBAYASHI KENZO (JP)
AIZAWA SHIGEMI (JP)
TAMURA TOSHIO (JP)
OIDE KENICHI (JP)
IWAMATSU TAKANORI (JP)

International Classes:

H04L25/03; H04L27/36; (IPC1-7): H04L27/00

Foreign References:

JPH08242263A	1996-09-17
JP2002232494A	2002-08-16
JPH05121958A	1993-05-18

Other References: