Patent ID: 8379780

Claim:
A method for compensation of information losses caused by blanking out pulse-shaped interferences, in a communication signal received by a receiver, wherein, in said method, the receiver receives a modulated OFDM-based multi-carrier signal comprising an overlap of a sequence of a predetermined number of subcarrier signals whose frequencies differ from each other by a constant amount and which have substantially no signal portions at the frequencies of the respective other subcarrier signals, with pulse-shaped interference signals, wherein complex data symbols are transmitted on each subcarrier, the pulse-shaped interference signals are eliminated in the receiver by pulse blanking in that the interfering pulses are first detected and then the modulated time domain signal is set to zero at the points affected by the pulse-shaped interference, the thus obtained signal, when represented by way in the frequency domain, is characterized in that the signal portions at each subcarrier frequency consist of an overlap of determinable signal portions respectively of all other subcarrier signals, and therefore inter-carrier interference (ICI) occurs, and from the respective signal portion at a subcarrier frequency, those determinable signal portions are subtracted in the frequency do-main which result from the subcarrier signals of all other subcarriers and are reconstructed from an estimation of the complex data symbols transmitted on each subcarrier, an estimation of the influence of the transmission channel on each subcarrier and knowledge on the position and number of the points affected by the pulse-shaped interference, where pulse blanking has been applied, the estimates for the complex data symbols are obtained by detecting and decoding the received equalized complex symbols and encoding and modulating them again and estimates of the channel coefficients are obtained from channel estimation, and the signal where the undesired signal portions of all other subcarrier signals, namely ICI, have been partly compensated is processed in the same way in further iterations in order to improve the estimates of data symbols and channel coefficients and thereby, the information losses caused by blanking out the pulse-shaped interferences are compensated for.