Modified intersymbol interference canceller for digital microwave radio

A reduction of complexity in full-digital implementations of the adaptive equalizing function for digital microwave radio (DMR) is attained using a modified intersymbol interference canceller instead of a conventional equalizer. The reduction of complexity is mostly due to the fact that preliminary decisions are coded in a relatively small number of bits and additional cancelling stages are used. For equalizers typically employed in 140 Mbit/s DMR systems, the complexity reduction can exceed 50%. A numerical method of calculating error rates was extended and used to obtain signatures for modified cancellers and conventional equalizers, which are presented