Method for linearsing high-frequency amplifier
AssigneeMarconi Communications, Inc.
InventorsHeike Hofmann, Franz J Hagmanns
Life of this patent
Estimating the term…
Abstract
A predistorter is connected upstream of a high-frequency amplifier to be linearized. A predistortion factor is adaptively modified in the predistorter in such a way as to compensate non-linearities of the amplifier as well as possible. The quotient of the output signal of the high-frequency amplifier and the input signal of the predistorter is produced first. An average amplification is then determined based on the signal quotient. A correction term is produced for the predistortion factor, this correction term being dependent on the extent of the deviation of the average amplification from a set value. The predistortion factor is adaptively modified in such a way as to minimize the correction term.
Claims6
A method of linearizing a high-frequency amplifier, comprising the steps of:
- a) connecting a predistorter upline;
- b) adaptively altering a predistortion factor so that a linear relation exists between an output signal of the high-frequency amplifier and an input signal of the predistorter;
- c) forming a quotient from the output signal of the high-frequency amplifier and the input signal of the predistorter;
- d) determining an average amplification from the quotient;
- e) forming for the predistortion factor a correction term which depends on a deviation of the average amplification relative to a reference value;
- and
- f) continuing to adaptively alter the predistortion factor so that the correction term becomes minimal.
Dependencies are inferred from the claim text.