A Novel Decision Feedback Equalizer for SC-FDE System

Residual inter-symbol interference(ISI) is the main disadvantage of MMSE equalizer for single carrier frequency domain equalization(SC-FDE) system,so a MMSE(minimum mean-square-error)-RISIC(residual ISI cancellation)decision feedback equalizer was presented for SC-FDE system to eliminate the residual ISI.The MMSE-RISIC equalizer used decisions,acquired from MMSE equalization,to estimate and remove the residual ISI.The computational complexity was very low because only FFT and IFFT were used in the residual ISI estimation.The effect of the equalizer was evaluated in the condition of different channels.Simulation results show that higher performance can be achieved on frequency selective fading channel.