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Re: [Discuss-gnuradio] want to achieve the symbol rate to 270.833kb/s

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] want to achieve the symbol rate to 270.833kb/s
Date: Wed, 15 Sep 2010 07:43:42 -0400

2010/9/15 intermilan <address@hidden>:
> hi all:
>         I want to make the symbol rate of the data which is transmited by
> the USRP at the 270.833kb/s.I know the OpenBTS had already make it come
> true. but what I want to know is that can I use the resampler block to make
> this happen? (put the resampler block after the GMSK Mod block )and the
> value of the interpolation and decimation of the resampler block can be the
> same as them in the OpenBTS which are 65 and 96.and the interpolation of the
> USRP is 320 which is make the sample rate of the usrp is 400k.I have not do
> it now ,just want to ask here if  it is possible.

You should be able to use the gr.pfb_arb_resampler_ccf block to
accomplish this. It's an arbitrary resampler and so doesn't rely on
integer relationships. It can be a bit tricky to use, so look at the
examples in gnuradio-examples/src/python/pfb for help in designing the
filter for it.

... One of these days, I need to make a convenience wrapper for this
block that designs the filter for the half sample rate


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