John Wilson john.wilson at
Mon Jun 17 09:41:22 UTC 2013

If you need to extract them all simultaneously then you'd need about 25 MHz
baseband bandwidth, which I think at the moment is a bit more than the
UmTRX can do on one channel, you might be able to do something clever and
look across both channels maybe. That's a whole lot of processing as well,
I'm guessing you'll be analyzing the signals offline? USRP2 or USRP N
series and do about 25 MHz sustained on one channel, you'll need some good
network hardware on your PC to prevent overruns.


On 17 June 2013 10:23, Albert-Miquel Sánchez <albertm at> wrote:

> Hello,****
> I’m an engineer from Spain and I’m interested in a GSM receiver because I
> would like to study the internal signals for a research project. In
> particular, I’m interested in the analysis of the IF signal, but, as
> Alexander told me, the LMS6002D uses zero-IF architecture, so there is no
> real "IF" signal, there is only baseband signal. I guess I could also use
> this signal for my purposes, but only if all 124 GSM channels can be found
> at that point. I’m not sure if this is possible, since there is a low-pass
> filter before. Does anybody know if I can extract that information, that
> is, the analogic 124 channels after the RF mixer? If it is not possible
> with this board, does anybody know if I can do it with another GSM
> transceiver board?****
> Thank you very much in advance.****
> Best regards,****
> Albert****

*Dr. John Wilson*
Product development engineer, Path
T +44 2392 388442    @pathintel

Path Intelligence Limited, registered number 5176274. Registered in
registered office at 1000 Lakeside North Harbour, Western Road, Portsmouth,
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