Because there is no universal Slepian-Wolf coding,and the memoryless channel model can not correspond with the actual needs,the interactive encoding and decoding(IED)schemes are used to establish universal coding and memory finite state channel(FSC)model.A belief propagation(BP)decoding algorithm is proposed for low density parity-check(LDPC)decoding,which is modeled as a FSC.Experiments results show that the bit error rate(BER)of IED schemes is lower than that of not-IED schemes and the gap between rate an...