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Any communication channel will usually distort the transmitted signal. Thisis especially true in the case of mobile systems, where multipath propagationcauses the received signal to be seriously degraded. Over the years, manytechniques have been proposed to combat channel effects. Two of the mostpopular are linear equalisation (LE) and decision feedback equalisation (DFE).These methods offer a good compromise between performance and computationalcomplexity. LE and DFE are implemented using finite impulse response (FIR)filters whose frequency spectrum approximates the inverse of the channelspectrum plus noise. In mobile systems, the equaliser is made adaptable inorder to be able to respond to the channel variations. Adaptability is achievedusing adaptive FIR filters whose coefficients are iteratively updated. Inprinciple, an infinite number of filter coefficients would be needed to achieveperfect channel inversion. In practice, the number of taps must be finite.Simulations show that, in realistic scenarios, making the equaliser longer thana certain (undetermined) number of taps will not yield any benefit. Moreover,computation and power will be wasted. In battery powered devices, like mobileterminals, it would be desirable to have the equaliser properly dimensioned.The equaliser's optimum length strongly depends on the particular scenario, andas channel conditions vary, this optimum is likely to vary. This thesispresents novel techniques to perform equaliser length adjustment. Methods forthe LE and the DFE have been developed. Simulations in many different scenariosshow that the proposed schemes optimise the number of taps to be used.Moreover, these techniques are able to detect changes in the channel andre-adjust the equaliser length appropriately.

Reconfigurable Structures for Direct Equalisation in Mobile Receivers