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Some results in the theory of crosstalk-free transmultiplexers

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3 Author(s)
Koilpillai, R.D. ; Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA ; Nguyen, T.Q. ; Vaidyanathan, P.P.

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

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Signal Processing, IEEE Transactions on  (Volume:39 ,  Issue: 10 )