On 14/10/2011 12:01 PM, Tom Rondeau wrote:
You've almost got it right except for the taps. The "taps" parameter
is the FIR taps of the prototype filter, which then gets partitioned
among the N channels of the channelizer.
While there is no example in GRC readily available, you can look at
the channelize.py example in: gnuradio-examples/python/pfb/
Specifically, line 49 is where the filter taps are created. Notice
that the sample rate is the sample rate at the input to the
channelizer while the bandwidth and transition width are defined for
the channel bandwidths. This makes a fairly long filter that is then
split up between the N channels of the PFB.
Tom
I have to wonder, though, John, whether your "scheme" for saving power
in a linear transponder is actually going to be workable.
Yes, you'll squelch the "no signal" channels going into the transponder,
but that is only the difference between the received Tsys over
the filter bandwidth and the inherent noise power of the transmitter
itself.
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