Band-Limited channels have very bad effects on modulation classification of digital modulated signals.qLLR based modulation classifier is valid for classification of BPSK/QPSK signals in ISI Channel.GLRT based classifier makes use of Viterbi algorithm in maximum likelihood estimation of modulation symbol sequences

and PSP in estimating the effects of ISI on the sequence.Simulations show that they can achieve a very good classification performance in ISI channels.