Blind adaptive decision feedback equalization algorithm correct by instantaneous error

Blind adaptive decision feedback equalization algorithm correct by instantaneous error was proposed in this paper. Decision feedback equalizer, including the composition of FIR filter and IIR filter, under the condition of complex multi-path transmission in digital communication, the signal from multi-path can either fall on FIR filter or IIR filter. when FIR filter has no enough length taps, the IIR filter would provide misinformation for updating the weights of equalizer. Instantaneous error can get from each iteration, if instantaneous error increase after one iteration, then keep the previous state of equalizer without feedback filter, otherwise, in accordance with the decision feedback equalization algorithm to update the equalizer weights. Furthermore, CMA and DD algorithm mode can switch according to the cumulative average of the instantaneous error. Simulation results show that the equalization performance is improved compare with the traditional blind decision feedback equalization algorithm.