Table reference type predistorter

Details Table reference type predistorter Table reference type predistorter

2008-06-24

2008-06-24

Phu, Sanh D (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S114200, C455S063100, C455S067130, C375S295000, C375S296000, C375S297000, C330S136000, C330S149000

Reexamination Certificate

active

07392020

ABSTRACT:
The purpose of the present invention is to compensate the distortion of an amplifier by a predistorter which compensates the distortion of a power amplifier even when a frequency amplitude deviation exists. The predistorter comprises a distortion compensation coefficient storage unit for storing a distortion compensation coefficient corresponding to the reference value using the characteristic quantity of the envelope of a transmission signal before being inputted to the power amplifier as a reference value; and a reference value conversion unit for converting the characteristic quantity into a predetermined value according to the size of the characteristic quantity, and when the characteristic quantity is, for example, the amplitude value of an envelope and the amplitude value is small, that value is rounded up, for example, to an upper-limit value within a linear range of the amplifier.

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Supplementary European Search Report dated Mar. 29, 2007, from the corresponding European Application.
Notice of Rejection Grounds dated Oct. 2, 2007, from the corresponding Japanese Application.

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