An Iterative Scheme to Reduce Influence of Impulse Noise in OFDM Transmission

In OFDM transmission, performance is degraded by the existence of time domain impulse noise because this noise has very wide bandwidth, and it affects all the carriers in the OFDM signal. Especially, the influence of impulse noise with large amplitude cause severe degradation. In this paper, a scheme that iteratively reduces the influence of impulse noise is proposed. In the proposed scheme, the symbols after decision are re-modulated to generate a time domain OFDM signal to replace the samples that are degraded by the impulse noise in the time domain. The time domain OFDM signal is demodulated again after the influence of the impulse noise is reduced. Moreover, By repeating this procedure iteratively changing the threshold value, further improvement is achieved.