17 Jun
2013
17 Jun
'13
11:41 a.m.
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.
John
On 17 June 2013 10:23, Albert-Miquel Sánchez <albertm(a)salleurl.edu> 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****
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