Lantiq Deutschland Gmbh

Infineon Technologies Ag

Jacobs University Bremen Gmbh

Werner Henkel

Axel Clausen

Steffen Trautmann

Dietmar Sträuβnigg

Valentin Zrno

The invention relates to a method for reducing the crest factor of a data symbol to be transmitted in a multi-carrier data transmission system, in which the data symbol to be transmitted is a function of a multiplicity of signals provided within a predetermined data frame and each of these signals is allocated to a carrier, each carrier occupying in each case at least one frequency from a transmit data spectrum, at least one carrier being reserved which is not provided for the data transmission and the predetermined data frame exhibiting the data symbol and a prefix which is derived from a part of the data symbol, in which peak values within the prefix are also taken into consideration for reducing the crest factor.

Method for reducing the crest factor

According to the invention, a circuit for reducing the crest factor is provided:

Circuit and method for reducing the crest factor

The invention relates to a method for reducing the crest factor, comprising the following method steps: The invention also relates to a circuit for reducing the crest factor.

Method and circuit for reducing the crest factor

During data transmission by multi-carrier modulation of data blocks modulated by Inverse Discrete Fourier Transformation (IDFT), carriers that are not occupied by data are occupied in such a way as to generate temporal functions that, after filtration, are Dirac-like temporal functions that reach maxima in an oversampled temporal resolution of different, preferably adjacent positions. A pair of the oversampled Dirac-like temporal functions and corresponding filter input functions that are not oversampled is iteratively selected. The pair is displaced to a position of a peak value resulting from the data occupation of the remaining carriers, subtracted from the oversampled Dirac-like temporal functions after being weighted and, as iterative modifications, applied in parallel to the Dirac-like temporal functions and a corresponding temporal signal without oversampling and without filtration.

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Achim, Germany

Werner Henkel