Quantization based fast equalization in decision directed mode

To achieve low Bit Error Rate (BER) communication a new fast adaptive equalization technique in Decision Directed (DD) mode is proposed in this paper. The output of the equalizer is quantized to get the desired update signal and a new error term is defined based on a probabilistic scheme. The main feature of this technique is that it achieves low BER comparable to turbo equalizer with less computational complexity. This technique has been compared with conventional hard decision (HD), a soft decision directed (SDD) and adaptive turbo equalizer. It is shown that the proposed technique exhibits superior performance compared to HD and SDD. It also exhibits similar performance as the adaptive turbo equalizer but with much lower computational complexity under different SNR and channel conditions.