DocumentCode :
3711851
Title :
Channelized front-ends for broadband signal processing with relaxed anti-aliasing filtering
Author :
Vineet Kumar Singh;Wei-Gi Ho;Ranjit Gharpurey
Author_Institution :
The University of Texas at Austin
fYear :
2015
Firstpage :
1
Lastpage :
4
Abstract :
A digital post-processing approach for reducing the anti-aliasing requirement in a frequency-folding channelizer architecture is described. The channelizer decomposes a broadband spectrum into multiple sub-bands. A signal of bandwidth N/2fLO is downconverted into N paths that are clocked using rectangular, non-overlapping pulse waveforms at a fundamental frequency of fLO with a duty-cycle of 1/N. All portions of the input are aliased onto a baseband signal of bandwidth fLO/2, which is low-pass filtered and applied to N sub-ADCs with identical sampling clocks. Individual sub-bands are selected in the digital domain. Aliasing between sub-bands is also removed after digitization. This is used to reduce the order of the anti-aliasing filters in the analog signal paths, which can potentially reduce power and design complexity. It is shown that a filter-order of at least one is necessary in the analog-domain to apply digital post-processing. The approach is verified in simulation.
Keywords :
"Bandwidth","Harmonic analysis","Broadband communication","Baseband","Clocks","Transfer functions","OFDM"
Publisher :
ieee
Conference_Titel :
Circuits and Systems Conference (DCAS), 2015 IEEE Dallas
Type :
conf
DOI :
10.1109/DCAS.2015.7356596
Filename :
7356596
Link To Document :
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