Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published October 1, 1991 | public
Journal Article Open

Some results in the theory of crosstalk-free transmultiplexers


The crosstalk-free transmultiplexer (CF-TMUX) focuses on crosstalk cancellation (CC) rather than on suppressing it. The authors present an analysis of the CF-TMUX based on the polyphase component matrices of the filter banks used in TDM→FDM and FDM→TDM conversions, respectively. Thus a necessary and sufficient condition for complete CC is obtained. It is shown that the filters for a CF-TMUX are the same as the filters for a 1-skewed alias free QMF bank. In addition, if the QMF bank satisfies the perfect reconstruction (PR) property, then the TMUX also satisfies PR. The relation between CF-TMUX filters and alias-free QMF banks is used to obtain a direct design procedure for CF-TMUX filters (both FIR and IIR). It is also shown that approximately crosstalk-free TMUX filters can be obtained from any approximately alias-free QMC bank. Design examples and comparison tables are included.

Additional Information

© Copyright 1991 IEEE. Reprinted with permission. Manuscript received December 27, 1989; revised September 27, 1990. This work was supported in part by the National Science Foundation under Grants DCI 85 52579 and MIP 86 04456, and matching funds from Hughes Aircraft Co. and Tektronic, Inc.


Files (795.5 kB)
Name Size Download all
795.5 kB Preview Download

Additional details

August 22, 2023
October 16, 2023