Single Channel Blind Separation of Mixed Signals Applying Decision Feedback

This paper proposed a decision feedback-based PSP (DF-PSP) single channel blind separation algorithm. In this algorithm, the preliminary decisions, which are obtained by the most probable surviving sequence from the Viterbi detector, are used to synthesize the intersymbol interference caused by the tail of Channel impulse response, thus to make up the performance loss resulted from the Channel impulse response’s truncating processing of existing per-survivor processing algorithm for single channel blind separation. The simulation results show that DF-PSP is superior to the PSP algorithm for single channel blind separation algorithm at the same complexity in processing mixed QPSK signals and about 2 dB signal-noise ratio gain can be obtained at a bit error rate of , also this algorithm can obtained better performance increase in same oversampling ratio.