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@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@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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