DocumentCode :
1457626
Title :
Some results in the theory of crosstalk-free transmultiplexers
Author :
Koilpillai, R. David ; Nguyen, Truong Q. ; Vaidyanathan, P.P.
Author_Institution :
Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA
Volume :
39
Issue :
10
fYear :
1991
fDate :
10/1/1991 12:00:00 AM
Firstpage :
2174
Lastpage :
2183
Abstract :
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
Keywords :
digital filters; filtering and prediction theory; interference suppression; transmultiplexing; CF-TMUX; FDM-TDM conversion; FIR; IIR; QMF bank; TDM-FDM conversion; crosstalk cancellation; crosstalk-free transmultiplexers; filter banks; perfect reconstruction; polyphase component matrices; Bandwidth; Crosstalk; Filter bank; Filtering theory; Finite impulse response filter; Frequency division multiplexing; IIR filters; Signal synthesis; Sufficient conditions; Time division multiplexing;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/78.91174
Filename :
91174
Link To Document :
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