[srslte-users] Problem with srsLTE captures using bladerf

[Nicola Bui]

Dear all,

first of all let me thanks the team for the great job and the support they
gave me throughout my development.
I am capturing some lte traces with both a bladerf x40 and usrp x310. Both
are fine in most of the cases, but I found the bladerf x40 to introduce
some high power noise inband. You can find attached two pictures related to
similar captures:
- frequency 1854.1 MHz
- samplerate 11.52 Msps
- resource blocks 50
As you can see the bladerf capture shows two high power carrier on the
right side of the spectrum, which, usually are not a big problem, but when
I try to decode DCIs using that part of the spectrum (ncce 5, 24, etc.)

I tried a similar capture with bladeRF-cli and gnuradio (osmosdr
interface): the former got the same problem, the latter did not. My guess,
it is something related to how the bladerf is opened (I am thinking about
how the signal is filtered), but I have no clue on how to test it.

Is there any way to control the bladerf configuration from within pdsch_ue
or usrp_capture_sync?

Thanks a lot,
Nicola Bui

Research Engineer
IMDEA Networks Institute
Av. Mar del Mediterraneo, 22
28918 - Leganés (Madrid) - Spain
mobile: +34 657 633 987
phone: +34 91 481 6986
fax: +34 481 6965
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