A channel estimation-based adaptive equaliser for time-variant communications channels

For the purpose of tackling the problem of equalisation in a time variant environment, a novel approach is developed which uses two finite impulse response filters; one is a channel estimator and the other is an equalisation filter. The gradient algorithm with degree 1 least-square fading memory prediction is adopted for the channel estimator. Using the results produced by the channel estimator, the coefficients of the equalisation filter are indirectly updated. Computer simulation results show that the channel estimation based adaptive equaliser provides significant improvement in the case of a second order Markov communication channel model.