Blind MLSE equaliser with fuzzy metric calculation for mobile radio environments

The authors describe a novel approach to the problem of fading channels estimation. Specifically, the proposed system makes use of fuzzy logic in the computation of the metrics for an MLSE equaliser for GMSK signals in GSM typical environments. A comparison with the traditional Viterbi algorithm shows that the proposed system performs better under all channel conditions; for the same SNR, the improvement is about a half decade in BER or, conversely, the same BER can be obtained with an SNR 4dB lower than using the adaptive Viterbi algorithm alone