T. Hentschel et G. Fettweis, Continuous-time digital filters for sample-rate conversion in reconfigurable radio terminals, FREQUENZ, 55(5-6), 2001, pp. 185-188
Reconfigurable radio terminals must cope with a multitude of master clock r
ates of diverse mobile communications air interfaces. Digital sample rate c
onversion (SRC) is an elegant way to enable the processing of signals with
sample rates incommensurate to the clock rate of a nonsynchronized analog-t
o-digital converter. SRC is a process of resampling and thus, requires anti
-aliasing filtering. The well-known Farrow-structure provides a means of im
plementing digital SRC on a parameterizable hardware platform enabling the
adaptation to different rate change factors. Still, the Farrow-structure ca
n only implement filters with poor anti-aliasing characteristics. The trans
posed Farrow-structure introduced in this article overcomes these problems
and thus, represents a perfect means for SRC in reconfigurable radio termin
als.