Patent Number: 8,442,460

Title: Method for compensating signal distortions in composite amplifiers

Abstract: A method for compensating signal distortions in multiple transmitting branches (3, 5; 43, 45, 46) entering a composite amplifier (1; 1'). According to the invention the method comprises the steps of: --providing (S1) one or more input signals (x) to the composite amplifier. --observing (S2) an output signal (z) from the composite amplifier (1; 1') for each provided input signal; --deriving (S5) an error in each output signal (z) by comparing the output signal with an ideal output signal, said error being caused by said signal distortions; --deriving (S11) the individual contribution from each transmitting branch (3, 5; 43,45,46) to the error by utilizing a composite amplifier model, said composite amplifier model comprising information about the contribution from each constituent amplifier (23, 25; 103a,103b,103c) to the output signal for each provided input signal: --compensating the signal distortions in the transmitting branches (3, 5; 43,45,46) accordingly.

Inventors: Fonden; Tony (Kista, SE), Hellberg; Richard (Huddinge, SE), Klingberg; Mats (Enskede, SE), Dalipi; Spendim (Sollentuna, SE)

Assignee: Telefonaktiebolaget L M Ericsson (publ)

International Classification: H04B 1/04 (20060101)

Expiration Date: 2021-05-14 0:00:00