Abstract
Polyphase FilterBanks (PFBs) provide a computationally efficient approach
to extracting channels of arbitrary bandwidth from a wideband signal.
This technique, know as digital downconversion, would find use in
software radio applications. Conversely, PFBs can also be used to
perform digital upconversion, a process in which a wideband signal
is constructed from several narrowband channels. In this paper, we
apply the PFB technique to the IS-136 standard (North American Digital
TDMA). Since the IS-136 standard requires non-overlapping adjacent
channel filter masks, we show in this paper that the Generalized
PFB is the optimal architecture given the non-integer sampling rate
conversion that is needed to go from IF to baseband. Since frequency
offset correction is an important consideration for radio receivers,
we also present an augmented GPFB architecture that intrinsically
performs frequency offset correction.
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