DocumentCode :
768430
Title :
Transmultiplexer Realization with Multistage Filtering
Author :
Molo, Francesco
Author_Institution :
Telettra SpA, Vimercate, Italy
Volume :
30
Issue :
7
fYear :
1982
fDate :
7/1/1982 12:00:00 AM
Firstpage :
1614
Lastpage :
1622
Abstract :
Starting from the general principle of frequency shifting a 4 kHz bandwidth digital filter to perform the TDM-FDM conversion, a new decomposition of the filter is introduced. This decomposition allows for the use of a DFT of much lower dimension than the number of channels to be multiplexed, together with a few modulators (multipliers) working at the highest bit rate, and a tree configuration of filters and simple modulators. The filters are of a few different types and can be designated to have very simple coefficients, so avoiding the use of true multipliers; furthermore, wave digital filters, with their known advantages, can be used for some of the more severe filtering steps.
Keywords :
digital filters; multiplexing equipment; transmultiplexing; 4 kHz bandwidth digital filter; DFT; TDM-FDM conversion; decomposition; discrete Fourier transform; filters; finite impulse response filters; frequency shifting; modulators; post modulation; premodulation; wave digital filters; Bandwidth; Bit rate; Digital filters; Filtering; Finite impulse response filter; Frequency division multiplexing; Low pass filters; Sampling methods; Tree data structures;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOM.1982.1095628
Filename :
1095628
Link To Document :
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