PREDISTORTION TYPE DISTORTION COMPENSATION AMPLIFIER

Title:

PREDISTORTION TYPE DISTORTION COMPENSATION AMPLIFIER

Document Type and Number:

WIPO Patent Application WO/2000/074232

Kind Code:

A1

Abstract:

A predistortion type distortion compensation amplifier (9) in mobile communication, including a signal amplitude change processing unit (10) which comprises an odd number-th component calculation unit (14) for extracting for outputting an odd number-th power component of an amplitude contained in a signal to be transmitted, a coefficient information output unit (15) for selecting for outputting one of a plurality of elements of coefficient information by means of an outside signal, a multiplication unit (16) for multiplying a signal from the odd number-th component calculation unit (14) by coefficient information from the coefficient information output unit (15) to output a damping signal and an adding unit (17) for subtracting for outputting the damping signal from the signal to be transmitted, thereby ensuring an operation within a range of a saturation region of the amplifier to reduce a spurious signal and enabling a distortion compensation operation even when an adjacent channel leakage power is reduced and a memory reference frequency is decreased.

Inventors:

MANIWA TORU (JP)
HASEGAWA TSUYOSHI (JP)
KAWASAKI YOSHIHIRO (JP)

Application Number:

PCT/JP1999/002824

Publication Date:

December 07, 2000

Filing Date:

May 28, 1999

Export Citation:

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Assignee:

FUJITSU LTD (JP)
MANIWA TORU (JP)
HASEGAWA TSUYOSHI (JP)
KAWASAKI YOSHIHIRO (JP)

International Classes:

H03F1/32; (IPC1-7): H03F1/32

Foreign References:

EP0067091A1	1982-12-15
EP0085600A1	1983-08-10
JPH0416006A	1992-01-21
US4476438A	1984-10-09
US5164678A	1992-11-17
EP0433863A2	1991-06-26
EP0441580A2	1991-08-14
JPH0983417A	1997-03-28
US5798854A	1998-08-25

Other References: