Patent ID: 7529306

Claim:
A method for the estimation of the distortion of radio signals that is caused by inphase and quadrature (IQ) asymmetries, comprising the step of: transmitting radio signals in data blocks in a multicarrier transmission method with subcarriers n and subcarriers −n, wherein in the transmission spectrum subcarriers n and −n are arranged symmetrically with respect to a center frequency fc, which data blocks each contain a number of data symbols d composed of subcarrier symbols d n and d −n , wherein each data block contains two reference data symbols that succeed one another at instants i, i−1, during the reference data symbols with regard to each subcarrier pair n/−n, the transmitted data symbol on one subcarrier remains temporally constant, while that on the respective other subcarrier changes sign, and wherein the distortion parameters are calculated from the received subcarrier symbols.