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A very simple but general scheme for calculating irreducible bit error rate (BER) (namely, BER floor) due to inter-symbol interference (ISI) in frequency-selective Nakagami-Rice fading environments has been developed. The scheme, to which we call the equivalent transmission path model (ETP model), plays a role in connecting wave propagation with digital transmission characteristics in a general manner. By reconfiguring our papers on the ETP model presented so far, self-consistent calculation formula for BER due to ISI is presented. Finally, application of the model to indoor propagation environment is demonstrated.