The Asymmetric Decision Feedback Equalizer (ADFE), which may be described as a decision feedback equalizer (DFE) with the forward filter (FF) transposed to the transmitter, is proposed. The ADFE is shown to have the same minimum mean-square error (MMSE) tap weights as the DFE, and similar bit error rate (BER) performance. A finite discrete Markov process is applied to predict the BER of the ADFE. The ADFE may be used, along with a DFE, in a base-portable system (the ADFE system) to achieve asymmetric equalization, or a shift in equalization complexity from the portable to the base. The overall computational efficiency of the ADFE may also prove useful in other scenarios.
https://www.ece.unb.ca/petersen/pubs/conferences/queens96/