How is interpolation rate dynamically set?

GNU Radio
1

Hello, everybody!

I am working on the demo file:
gnuradio-examples/python/digital/benchmark_tx.py. In the file
transmit_path.py, it is said “specify bitrate. samples-per-symbol and
interp/decim will be derived.” How are interp/decim rate and
samples-per-symbol derived respectively? what is the range for the
variable interpolation rate? Is interpolation rate increased as a
multiple of 4? could anyone tell me where i can find the dynamical range
of interpolation rate?

Any help will be highly appreciated! Definitely appreciated! Thank
you!!!

Bill

2

On Fri, Sep 26, 2008 at 4:00 PM, Bill S.
[email protected] wrote:

Hello, everybody!

I am working on the demo file:
gnuradio-examples/python/digital/benchmark_tx.py. In the file
transmit_path.py, it is said “specify bitrate. samples-per-symbol and
interp/decim will be derived.” How are interp/decim rate and
samples-per-symbol derived respectively? what is the range for the variable
interpolation rate? Is interpolation rate increased as a multiple of 4?
could anyone tell me where i can find the dynamical range of interpolation
rate?

Try the wiki:

http://gnuradio.org/trac/wiki/UsrpFPGA#TransmitChain

The interpolating CIC filter, I believe, can handle integers in the
range [4,255]. The source can be found here:

http://gnuradio.org/trac/browser/gnuradio/trunk/usrp/fpga/sdr_lib

Brian