Channel impulse noise minimization using digital smear and desmear filter

The paper describes a digital smear-desmear technique (SDT) based on polyphase sequences with good autocorrelation properties. These sequences are applied to the design of digital smear/desmear filters and combined with Trellis-coded modulation (TCM) codes. The scheme has been investigated for 16-QAM and 64-QAM modulation. The impulse noise is modeled as a sequence of Poisson arriving delta functions with gaussian amplitudes. The impulse noise parameters are computed from experimental data. Results shows that the SDT filter design method yields a significant improvement in bit error rates as when subject to impulse noise, relative to systems with no SDT.