Fujitsu Corporation

Zhiqi Wang

Hui Li

Zhan Shi

Gang Sun

Jian Zhou

Jianmin Zhou

This invention relates to an amplifier device and a predistortion control method. The amplifier device comprises a predistortion unit, a predistortion control unit, and an amplifier unit, of which the predistortion control unit controls the predistortion unit in accordance with a signal fed back from the amplifier unit. The predistortion control method comprises determining power of a left side lobe of two side lobes of a frequency spectrum of the signal fed back from the amplifier unit; determining power of a right side lobe of two side lobes of a frequency spectrum of the signal fed back from the amplifier unit; determining a cost function in accordance with the power of the first and right side lobes, and controlling the predistortion unit in accordance with the cost function.

Amplifier device and predistortion control method

An adaptive digital predistortion device and method, the adaptive digital predistortion device including a predistortion unit for predistorting an input signal according to a predistortion parameter stored in a look-up table; a cost function generation unit for generating a cost function; a fixed segment point determination unit for determining a fixed segment point; and an update unit for updating parameters (u, u, k) according to the cost function to update the look-up table based on the updated parameters (u, u, k), wherein kis an updated adaptive segment point, uand uare slopes on two sides of the adaptive segment point ka; and for subsequently updating parameters (v, v) according to the cost function to update the look-up table based on the updated parameters (v, v) and the fixed segment point, wherein vand vare slopes on two sides of the fixed segment point. Therefore, the adaptive digital predistortion device according to the present invention can obtain a good performance within an acceptable convergence time by combining the adaptive segment with the fixed segment.

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Beijing, China

Zhiqi Wang