Patent ID: 7697602

Claim:
A method for pre-filtering training sequences used for a channel estimation of radio transmission characteristics in a radio communication system, in which an antenna arrangement having a plurality of antenna elements is used on a transmit side, comprising: feeding the training sequences via a pre-filter to the antenna elements on the transmit side; receiving the training sequences after transmission and using the training sequences to estimate radio transmission characteristics, which are described by spatial correlations, using the pre-filter to adjust the training sequences to the radio transmission channel characteristics, to thereby improve the channel estimation; dimensioning the pre-filter as a function of the spatial correlations to achieve a predefined error value of an algorithm used for channel estimation, wherein the training sequences are pre-filtered based on the following equation: F·S=V Tx *Φ f S where: S is a transmit-side training sequence matrix, F is a transmit-side pre-filter matrix, V Tx are eigenvectors of a transmit-side correlation matrix formed of transmit-side radio channel coefficients having long-term stability, and Φ f is a diagonal matrix for power assignment.