[USRP-users] Overflow with B210 for 2by2 MIMO design

Xavier Arteaga xavier.arteaga at softwareradiosystems.com
Mon Mar 11 04:29:34 EDT 2019


Hi Ayaz,
Can you try to run the command *uhd_usrp_probe* and check that opens the
USRP with USB3 and not USB2?

linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.009.007-5-ge8202128

-- Detected Device: B210
*-- Operating over USB 3.*
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass

Also, I recommend you to benchmark your system:
https://kb.ettus.com/Verifying_the_Operation_of_the_USRP_Using_UHD_and_GNU_Radio#Benchmarking_your_system

Regards,
Xavier


On Sun, 10 Mar 2019 at 18:59, Ayaz Mahmud via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Trying to develop 802.11n (a 2 by 2 MIMO) standard by using two B210s.
> Initially started with the existing flow of
> GnuRadio/examples/digital/OFDM/tx.ofdm.grc. Lets take only the transmitter
> side for this question.
>
>
>
> Things that are changed in OFDM.grc:
>
>    1. The OFDM allocator block: The sync word. It is changed as per the
>    rule of 802.11n. That is, we use preambles (STF/LTF…)
>    2. Made two exact same chains (just copying one flow), which
>    previously was one, and fed into USRP-2 input ports.
>    3. Sampling rate : 20 MSPS
>
>
>
> Problem :
>
>    1. Overflow occurs. (I am using USB 3.0 interface, on MAC). Two of the
>    interfaces connected with this same laptop. Max sample rate it can handle
>    is about 4MSPS.
>
>
>
> I have tried saving the files in the RAM and then transmit. Does not
> improve the situation much.
>
>
>
> Need suggestions on where should I look for the fix.
>
>
>
> Thanks.
> _______________________________________________
> USRP-users mailing list
> USRP-users at lists.ettus.com
> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/attachments/20190311/c73926eb/attachment.html>


More information about the USRP-users mailing list