A new decision feedback equalization method for digital microwaveradio

摘要

A novel equalization method using the decision feedback equalizerwith a variable reference position (VR-DFE) is proposed. The VR-DFE iscomposed of a forward equalizer, whose reference position is variabledepending on the channel response, and a backward equalizer. The VR-DFEemploys an adaptation algorithm which enables the reference position tovary according to the change in fading from minimum phase to nonminimumphase and vice versa. The VR-DRE has great advantages innonminimum-phase fade compared with an ordinary DFE. Computersimulations for 16 quadrature amplitude modulation (QAM) digital radioshow that the VR-DRE copes well with the rapid transition to thenonminimum phase 40-dB fade in 7000 symbol time slots without producinga decision error