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

From: intermilan
Subject: RE: [Discuss-gnuradio] want to achieve the symbol rate to 270.833kb/s
Date: Fri, 17 Sep 2010 16:30:59 +0800

hi Tom:

      I can not find the examples what you asked me to look for.so what the version of your Gnuradio? Mine is 3.2.2.
      Besides, I still wonder why I can not use the resampler block in the /gnuradio-core/src/python/gnuradio/blks2impl in which I can set the value of the interpolation and decimation.and the program will automatic to set the parameters of the filter I need.I think it is capable. So can you tell some specific reasons?

                                                                                                                                                                                          thank you 

> From: address@hidden
> Date: Wed, 15 Sep 2010 07:43:42 -0400
> Subject: Re: [Discuss-gnuradio] want to achieve the symbol rate to 270.833kb/s
> To: address@hidden
> CC: address@hidden
> 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
> automatically...
> Tom

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