METHOD AND ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) RECEIVER FOR REDUCING THE INFLUENCE OF HARMONIC INTERFERENCES ON OFDM TRANSMISSION SYSTEMS

摘要

The invention relates to a method and device for improving, on the receive side, the transmission quality (residual/bit error rate) of a data transmission system, which is based on orthogonal frequency division multiplexing (OFDM) technology and which is negatively influenced by narrow-band harmonic interference signals. The invention takes into account two technical measures. In one technical measure, a received OFDM symbol is processed by means of a cyclic rotation of the OFDM receive symbol and of a subsequent Nyquist windowing in the time domain whereby leading to a reduction of the interference spectrum outside of the sub-carrier bandwidth. In the other technical measure, a channel estimation of the channel transmission function on the sub-carrier level is effected in parallel with the first technical measure, and the signal-to-noise ratio is calculated or estimated by estimating the interference power on the sub-carrier level. This information with regard to the noise power is subsequently taken into account as channel state information during an error decoding effected, for example, by a Viterbi decoder.