Huawei Technologies Co., Limited

Francesco Lenoci

Sergio Bianchi

Maurizio Mattivi

Christian Mazzucco

A signal processing apparatus for processing an input signal (x) has an adaptive predistorter, an amplifier and a down-converter. The amplifier is configured to amplify a processed signal (y') to obtain an amplified signal (y&#x2033;). The down-converter is configured to multiply a version of the processed signal (y&#x2032;) with a version of the amplified signal (y&#x2033;), one of the signal versions being phase shifted, to obtain a first down-converted signal (z, z&#x2032;), and to multiply the processed signal (y&#x2032;) with the amplified signal (y&#x2033;) to obtain a second down-converted signal (z, z&#x2032;). The predistorter is configured to predistort the input signal (x) according to a predistortion characteristic to obtain the processed signal (y&#x2032;), the predistorter being further configured to adapt the predistortion characteristic based on the first down-converted signal (z, z&#x2032;) and the second down-converted signal (zz&#x2032;).

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Milan, Italy

Francesco Lenoci