Mitigation of narrowband interference using adaptive equalizers

It has previously been shown that a decision-feedback filter can mitigate the effect of narrowband interference. An adaptive implementation of the filter was seen to converge relatively quickly for mild interference. It is shown here, however, that in the case of severe narrowband interference, the decision-feedback equalizer (DFE) requires a convergence time that makes it unsuitable for some types of communication systems. The introduction of a linear predictor, as a pre-filter to this equalizer, greatly reduces the total convergence time. There is a trade-off, however, between convergence time and steady-state performance, and that is evaluated in this paper.