Patent ID: 7321264

Claim:
A predistortion control device comprising: a first predistortion control input selectively connected to a power amplifier output; a second predistortion control input selectively connected to a signal contact of a predistortion device; and a predistortion control output selectively connected to a control contact of the predistortion device, the predistortion control device further including: a cross-correlator device connected with a first cross-correlator input to the first predistortion control input and a second cross-correlator input to the second predistortion control input, wherein the cross-correlator device further has a cross-correlator output at which a cross-correlation signal can be presented, the cross-correlation signal representing a measured cross-correlation (Rm) of signals presented at the first cross-correlator input and the second cross-correlator input; a predistortion function selector device, connected with a selector input to the cross-correlator output, and with a selector output to the predistortion control output, said pre-distortion function selector device being arranged to compare the measured cross-correlation with a cross-correlation model stored in a memory and determining on the basis of said comparison a suitable predistortion function and presenting a predistortion control signal at said selector output said predistortion control signal representing said predistortion function.