Low Complexity Multi-Mode Transmultiplexer

Abstract

A transmultiplexer (TMUX) is a system which allow various users to share a common channel. A TMUX system capable of handling users belonging to different communication standards is called as a multi-mode TMUX. A method for implementation of such a TMUX of variable nature using fixed minimum hardware units is presented in this paper. The hardware reduction is achieved in two ways. First is by implementing variable bandwidth filters in the filter bank of TMUX using fixed filters and the other is by representing the filter coefficients in canonic signed digit (CSD) representation. The CSD representation is obtained by rounding the maximum precision coefficients to the finite precision coefficients with a limited number of signed power of two terms.