Considering that the orthogonality of STBC in frequency-selective fading will be destroyed by the multiple path interference（MPI）

an iterative interference cancellation based maximum likelihood sequence estimation（MLSE） decoding scheme was proposed for STBC in frequency-selective fading.Meanwhile

the maximum ratio combining（MRC） method was introduced to improve the proposed scheme

and decrease the computational complexity further.These schemes could effectively make up for the decoding deficiency of conventional STBC in frequency-selective fad-ing.They canceled not only the MPI from even terms corresponding to the orthogonality undestroyed by fading

but also the MPI from odd terms corresponding to the orthogonality destroyed by fading;they has superior performance.More-over

they have lower decoding complexity when compared with direct MLSE decoding of the long sequence signal.Thus they implement good decoding performance with low complexity.